GB2529189A

GB2529189A - Air sampling apparatus

Info

Publication number: GB2529189A
Application number: GB1414291.3A
Authority: GB
Inventors: Chris Conlon; Dave Rice; Mark Bullen; Lee Smith; Joe Cowan; Kevin Hancock; David Mills; John Patrick; Dave Hopkins; Geoff Kemp
Original assignee: TECH ELECTRONICS Ltd C
Current assignee: TECH ELECTRONICS Ltd C
Priority date: 2014-08-12
Filing date: 2014-08-12
Publication date: 2016-02-17
Anticipated expiration: 2034-08-12
Also published as: GB201414291D0; GB2529189B

Abstract

An air sampling apparatus (1, fig 1) for monitoring airborne particle concentration comprises a main body (2, fig 1) having a chamber 24, an air inlet 32 in fluid communication with the chamber, and an air drawing means, such as a pump 26, disposed within the chamber, in fluid communication with the air inlet for drawing air through the air inlet and through a filter head 62 for collection of airborne particles. The apparatus also comprises an air outlet 34 in fluid communication with the chamber, which is sealed from the surrounding environment such that air drawn through the air inlet is restricted to flow out of the chamber through the air outlet. In use, a telescopic mast 10 may be extended, and the filter head mounted on the mast. Airborne particles, such as asbestos fibres are separated from the drawn air by the filter head. An ear portion (8, fig 2) may be provided adjacent the main body, which is used to store a flexible fluid conduit (49, fig 5). The main body may have a generally smooth exterior to aid decontamination, and may include a battery compartment (42, fig 4) for housing a battery (40, fig 4).

Description

AIR SAMPLING APPARATUS

The present invention relates to an air sampling apparatus. In particular, the present invention relates to an air sampling apparatus for monitoring airborne particle concentration.

Situations exist in which it is desirable to monitor airborne particle concentration within a given volume of air or other fluid. Particles which it may be desired to detect or monitor include contaminants such as asbestos. Such contaminants are harmful to health, and it is therefore necessary to determine the presence and concentration of such particles in an air volume. This provides information on the risk to health of breathing that air.

Particulate contaminants can attach to personnel and equipment, for example during air sampling for such contaminants. There is therefore a risk that movement of personnel and equipment can lead to transfer of contaminants from the sampling environment to another location. The sampling environment might be a sealed volume, where it is suspected that contaminants are present, or it might be an outdoor environment. To reduce the risk of contaminants being transferred from the sampling environment, the personnel and equipment need to be decontaminated.

Decontamination generally includes vacuuming with a suitably rated vacuum cleaner, wiping with a damp cloth and/or showering.

A conventional air sampling apparatus comprises a filter head connected to an air inlet of a box housing a pump and controls. The box is typically of a metal construction. A mast is provided to locate the filter head a given distance above the floor -typically 1 m or 1.5m. In use, air is drawn through the filter head and into the box. The air seeps out through gaps in the box. The box is typically carried by an operator when entering and leaving the sampling volume.

A problem with the conventional air sampling apparatus is that it may be inadvertently exposed to water or other fluid. For example, the box may inadvertently be carried through a shower by the operator. In this case, water can enter the box and can adversely affect the electronics, causing damage. This can reduce the useful lifespan of the box, and/or increase the frequency with which the apparatus needs servicing.

In conventional apparatus, controls are fitted on the box. This results in gaps between the controls and the box material, and/or sharp edges where the controls protrude from the box material. These gaps and/or sharp protrusions provide locations where contaminant can accumulate, making the cleaning/decontamination process more laborious.

Further, in conventional apparatus, a coiled tube is used to connect the filter head with the inlet. This tube can be extended as necessary during use. However, the slack of the tube when not in use can cause it to become snagged when being carried, potentially causing damage. An alternative conventional apparatus provides a rigid tube. This has the disadvantage that it is more difficult to store and transport.

It is an aim of the present invention to overcome at least some of the drawbacks associated with a conventional air sampling apparatus.

According to a first aspect of the present invention there is provided an air sampling apparatus for monitoring airborne particle concentration, the apparatus com prising a main body having a chamber therein, an air inlet in fluid communication with the chamber, an air drawing means disposed within the chamber, the air drawing means being in fluid communication with the air inlet for drawing air through the air inlet and through a filter head for collection of airborne particles, and an air outlet in fluid communication with the chamber, wherein the chamber is sealed from the surrounding environment such that air drawn through the air inlet is restricted to flow out of the chamber through the air outlet.

Such an apparatus may advantageously be resistant to ingress into the chamber of cleaning fluid such as water. Thus, this arrangement may help prevent damage to the apparatus and prolong the life of the apparatus.

The air drawing means may be a pump.

The air inlet may be connectable to the filter head through a flexible fluid conduit, and the apparatus may comprise an ear portion for receiving the flexible fluid conduit thereon. This may advantageously provide a location on the apparatus on which a fluid conduit may be stored. This can help reduce snagging of the fluid conduit when the apparatus is being moved or stored, reducing the chance of damage.

According to a second aspect of the present invention there is provided an air sampling apparatus for monitoring airborne particle concentration, the apparatus comprising a main body having a chamber therein, an air inlet in fluid communication with the chamber, and an air drawing means disposed within the chamber, the air drawing means being in fluid communication with the air inlet for drawing air through the air inlet and through a filter head for collection of airborne particles, wherein the air inlet is connectable to the filter head through a flexible fluid conduit, and the apparatus comprises an ear portion for receiving the flexible fluid conduit thereon.

This may advantageously provide a location on the apparatus on which a fluid conduit may be stored. This can help reduce snagging of the fluid conduit when the apparatus is being moved or stored, reducing the chance of damage.

The air drawing means may be a pump.

The apparatus may comprise an air outlet in fluid communication with the chamber. This may provide for an air flow path through the air inlet, the chamber and the air outlet. This can allow the construction of the apparatus with a minimal number of apertures into the chamber.

The following features may be provided with either aspect above.

Preferably the air outlet is a one way valve or non-return valve. This can allow air to exit the chamber whilst restricting ingress of fluid into the chamber. This can enhance the resistance to ingress of a given pressure of fluid from outside the chamber. The apparatus may comprise an air outlet cap for covering the air outlet. Preferably the air outlet cap provides a watertight seal about the air outlet.

This may further enhance the resistance to ingress of fluid. This may also protect the air outlet during, for example, cleaning, storage or transport.

The main body may comprise a first body portion and a second body portion which define at least a portion of the chamber. This may allow the construction of the apparatus from a minimum number of parts. This arrangement may also allow the sealing of the chamber with a minimum number of seals. This can help reduce the complexity of the construction and/or reduce cost. The main body may comprise a main body seal for sealing between the first body portion and the second body portion. The main body seal may be to seal the chamber from the surrounding environment. One of the first and second body portions may comprise the main body seal, and the other of the first and second body portions may comprise a main body seal seat for receiving the main body seal.

The main body may comprise a battery compartment for housing a battery, which battery compartment is separate from the chamber. The provision of a battery compartment which is separate from the chamber can allow the integrity of one or other of the battery compartment and the chamber to remain intact even if the other is compromised.

This can also allow the changing of a battery without affecting the chamber seal.

Thus if a battery needs to be changed in a contaminated environment, the chamber need not be contaminated.

The apparatus may comprise a battery compartment cover for covering the battery compartment and a battery compartment seal for sealing between the main body and the battery compartment cover. This can allow the battery compartment to be sealed against potential fluid/contaminant ingress. One of the S main body and the battery compartment cover may comprise the battery compartment seal, and the other of the main body and the battery compartment cover may comprise a battery compartment seal seat for receiving the battery compartment seal. This arrangement may allow the sealing of the battery compartment with a minimum number of seals. This can help reduce the complexity of the construction and/or reduce cost.

Preferably at least one of the main body seal and the battery compartment seal is an C-ring seal. Other known types of seal can, of course, be used instead or in addition. This can allow easy construction of the apparatus, and/or construction from a minimum number of parts. This can increase the efficiency of manufacture of the apparatus.

The apparatus may comprise a battery charging port for enabling connection to a battery charger. The battery charging port may be provided in the main body. The battery charging port may be provided with a battery charging port cap for providing a watertight seal about the battery charging port. This can aid in preventing water from entering the apparatus.

Preferably the apparatus is arranged so that the air drawing means can be powered by at least one of a battery and an external electrical connection. This can allow flexibility of use of the apparatus. This can mean that the apparatus can be left to sample air for a period of time that might exceed the capability of a single battery. The external electrical connection may be provided through the battery charging port.

The main body may have a generally smooth exterior. This can help make the main body easier to clean.

The apparatus may comprise a display panel. The display panel may comprise a display and/or one or more control for controlling operation of the apparatus.

Such a control might, for example, be a power switch, a timer control, an air drawing means speed control, or other control for controlling an operation of the apparatus. The control may be a button or knob or the like. Preferably the display panel comprises a plurality of interface elements such as a display and a control.

This may avoid the need to provide these elements separately. This can reduce the number of potential fluid ingress routes into the main body of the apparatus.

This can help to minimise fluid ingress. The display may be a LCD or the like.

The apparatus may comprise a display panel comprising a waterproof screen.

The display panel may be recessed into the apparatus so that the waterproof screen is flush with the surface of the apparatus. This may reduce the number of locations where particles or contaminant can accumulate, making decontamination of the apparatus easier and more efficient.

The ear portion may be provided adjacent the main body. The ear portion may comprise a lip distal from the main body for retaining the fluid conduit. Preferably the ear portion is provided adjacent the main body and comprises a lip distal from the main body for retaining the fluid conduit. The lip may be provided around the full extent of the ear portion.

The ear portion may comprise an ear portion recess within the ear portion. The ear portion recess may expose a portion of the main body. In other words, a portion of the main body may be accessible via the ear portion recess. Preferably at least one of the air inlet and the air outlet is provided on the main body such that it is located within the ear portion recess. In this way, one or both of the air inlet and the air outlet may be protected from damage by being within the ear portion recess. When the apparatus is moved or stored, this location of one or both of the air inlet and air outlet can make it less likely that the air inlet or air outlet will get knocked. This can also make the apparatus easier to store and transport by reducing its external profile.

The apparatus may comprise a mast-receiving recess for receiving a mast.

Preferably the mast-receiving recess is provided in the main body. In this way, a mast received in the mast-receiving recess may be protected from damage by being within the mast-receiving recess. In other words, when the apparatus is moved or stored, the provision of the mast-receiving recess can make it less likely that a mast will get knocked. This can also make the apparatus easier to store and transport by reducing its external profile.

The apparatus may comprise a first mast attachment means. Preferably the first mast attachment means is provided in the main body. The first mast attachment means may allow a mast to be quickly attached to and detached from the first mast attachment means. This may facilitate ease of detachment of a mast for replacement andlor cleaning.

The apparatus may comprise a mast received in the mast-receiving recess. The mast is preferably telescopically extendable. The mast may comprise a second mast attachment means. The second mast attachment means may be provided towards one end of the mast. The second mast attachment means may be arranged to cooperate with the first mast attachment means such that the mast is attachable to the first mast attachment means.

The first mast attachment means may comprise an internally threaded portion.

The second mast attachment means may comprise an externally threaded portion. Other means for attachment are possible, such as the threaded portions being reversed, and the provision of a friction or snap fit attachment.

The apparatus may comprise means for receiving a filter head assembly. The apparatus may comprise a filter head assembly. The apparatus may comprise a fluid conduit. The apparatus may comprise a flexible fluid conduit. The fluid conduit may be a tube or hose. The fluid conduit may be made of plastic. The fluid conduit preferably has a smooth surface for ease of cleaning. The fluid conduit may have a first end and a second end. Preferably the first end of the fluid conduit is attachable to the air inlet. Preferably the second end of the fluid conduit is attachable to the filter head assembly.

The filter head assembly may comprise a filter head. The filter head assembly may comprise a filter head holder. Preferably the filter head assembly comprises a filter head and a filter head holder. Preferably the filter head is replaceably mounted to the filter head holder. This can allow different filter heads to be used with the filter head holder. This can enable sampling for different contaminants.

This can also allow the filter head to be replaced after use.

The filter head assembly may comprise a filter head cap. The filter head cap may provide a watertight seal about the filter head. This can help in protecting the filter head during storage and transport, and/or protect the filter head during cleaning, for example by preventing cleaning fluid from damaging the filter head.

The filter head may, for example, be mounted to the filter head holder by a friction fit mounting, a snap fit mounting or a screw fit mounting. This may enable quick and easy replacement of the filter head.

Preferably the second end of the fluid conduit is attachable to the filter head.

Thus sampled air can pass directly from the fluid conduit to the filter head. This can reduce potential contamination of the filter head holder.

The filter head holder may comprise a first aperture for receiving a portion of the fluid conduit therethrough. The filter head holder may comprise a second aperture for receiving a portion of the fluid conduit therethrough. The provision of the first and/or second aperture can reduce relative movement between the fluid conduit and the filler head holder. Preferably the filter head holder comprises a first aperture and a second aperture, each for receiving a portion of the fluid conduit therethrough.

Preferably the filter head holder comprises a support portion. The support portion may be provided between the first and second apertures. The support portion can help further reduce relative movement between the fluid conduit and the filter head holder. Thus abrasion damage to the fluid conduit and/or the filter head holder can be minimised.

The support portion may be provided in the form of a continuous support portion between the first and second apertures. The support portion may be provided in the form of an arch between the first and second apertures. Thus the support portion can support the fluid conduit along its length between the first and second apertures. The support portion can support the fluid conduit so as to avoid the fluid conduit forming a sharp bend. This can help reduce potential damage to the fluid conduit.

The filter head holder may comprise a base portion. Preferably the first and second apertures are provided in the base portion. Preferably the support portion is provided on the base portion. The support portion may be provided on the base portion between the first and second apertures.

The filter head holder may comprise at least one holding portion for holding the filter head holder in a storage position. The storage position may be within the ear portion recess. The holding portion may be arranged for holding the filter head holder in the storage position by a frictional engagement between the filter head holder and the ear portion. Thus the filter head holder can be easily and quickly located in and removed from the storage position.

Preferably the filter head holder comprises two holding portions. The two holding portions may be provided towards each end of the filter head holder. Preferably the two holding portions are provided towards each end of the base portion of the filter head holder. The two holding portions may be arranged for frictional engagement with the ear portion. Preferably the two holding portions are arranged for frictional engagement with an inside of the ear portion.

The ear portion may comprise at least one slot for receiving at least a portion of the filter head holder. The slot may be for receiving at least a portion of the holding portion. Preferably the ear portion comprises at least a pair of slots for receiving at least a portion of the filter head holder. Preferably the pair of slots are for receiving at least a portion of the holding portions. The slot may be provided on the inside of the ear portion. Preferably the pair of slots are provided on the inside of the ear portion.

Preferably at least a portion of opposite sides of the inside of the ear portion are generally parallel. The pair of slots may be provided on the generally parallel portions. Preferably the ear portion comprises a plurality of pairs of slots for receiving at least a portion of the filter head holder. Preferably the plurality of pairs of slots are provided on the generally parallel portions. This can help ensure that a single filter head holder can be accommodated in each of the plurality of pairs of slots. In other words, the slots within each pair of slots may be generally equidistant from one another.

The holding portion of the filter head holder may be provided with an engagement portion for engaging with the slot. Preferably the holding portions of the filter head holder are provided with at least one engagement portion for engaging with the slot. The slot may comprise a slot recess. The slot recess may comprise an upper slot recess and a lower slot recess. The engagement portion may comprise a protrusion. The protrusion may be engageable with the slot recess. The protrusion may be engageable with one or both of the upper slot recess and the lower slot recess. The protrusion may comprise a first protrusion portion and a second protrusion portion. The first protrusion portion may be engageable with the upper slot recess. The second protrusion portion may be engageable with the lower slot recess. This can help securely locate the filter head assembly in the storage position.

The ear portion may comprise an opening for receiving therethrough a portion of the fluid conduit. Preferably the opening is one of adjacent and opposite the air inlet. This means that the length of the fluid conduit between the air inlet and the opening can be minimised. Thus the length of the fluid conduit needed can be minimised. This may also mean that sharp bends in the fluid conduit can be avoided, reducing the risk of damage to the fluid conduit.

Preferably the opening is provided towards the top of the ear portion. This means that the fluid conduit passing through the opening can come out towards the top of the ear portion. This can minimise the length of fluid conduit needed when using the air sampling apparatus.

The ear portion may comprise an additional opening for receiving therethrough a portion of the fluid conduit. Preferably the additional opening is towards the bottom of the ear portion. Preferably the additional opening is a slot in the ear portion. This means that the fluid conduit can be wrapped around the ear portion, and can pass into the ear portion recess. Thus, the filter head assembly, attachable to the second end of the fluid conduit, can be located in the storage position when the fluid conduit is wrapped around the ear portion. This can allow an easy location of the filter head assembly in the storage position and can help reduce damage to the filter head assembly when the apparatus is being moved or stored.

The additional opening may be provided towards one side of the ear portion. This can help reduce the bending of the fluid conduit when the filter head assembly is in the storage position. This may be because the first aperture of the filter head holder, through which the fluid conduit passes, is located towards one end of the filter head holder. Preferably the additional opening is provided towards the bottom of the ear portion and towards one side of the ear portion.

Preferably the first and second apertures are aligned along a line diagonal to a notional longitudinal axis defined by the filter head holder. That is to say, the first and second apertures may be aligned along a line which is at an angle to the longitudinal axis. This can facilitate the wrapping of the fluid conduit around the ear portion and location of the filter head assembly in the storage position without the fluid conduit overlapping itself. In other words, the portion of the fluid conduit passing through the opening in the ear portion may be proximal to the main body, and the portion of the fluid conduit passing through the additional opening in the ear portion may be distal from the main body. This can allow the fluid conduit to wrap around the ear portion without needing to overlap itself. This can reduce the exterior profile of the fluid conduit when wrapped. This may reduce a potential source of wear or damage on the fluid conduit.

The location of the first and second apertures can also facilitate the location of the filter head assembly in the storage position such that the protrusion of the filter head outside the profile of the ear portion is minimised. That is to say, the second aperture may be provided towards the side of the filter head holder that is proximal the main body when in the storage position. The fluid conduit passing through the second aperture, and the filter head attachable thereto, may likewise be located towards the main body, therefore maximising the portion of the filter head that is within the profile of the ear portion.

In an alternative, the second aperture may be provided towards the side of the filter head holder distal from the main body when in the storage position. This may minimise the extent to which the filter head protrudes from the side of the filter head holder adjacent the main body, which may allow the filter head holder to be more securely located in position adjacent the main body.

The filter head assembly may comprise a mounting portion for mounting the filter head assembly on or to the mast. Preferably the filter head holder comprises the mounting portion. The mounting portion may comprise a recess in the filter head holder. The mounting portion may comprise a blind hole in the filter head holder.

The mounting portion may be offset from a centre of the filter head holder such that the filter head assembly can be balanced when mounted on the mast.

The mast may comprise a mount on which the filter head assembly is mountable.

The mount is preferably provided towards an end of the mast distal from the main body. The mount preferably comprises a ball shaped mount. The mount may cooperate with the mounting portion so as to mount the filter head assembly on or to the mast. Preferably the mount is receivable within the mounting portion. In this way, the filter head assembly can quickly be mounted on or to and demounted from the mast, for ease of deployment and storage.

Preferably the apparatus comprises a handle spaced from the main body. The handle may be spaced from the main body by at least one handle support. The handle support may be formed from a material such as plastic with a low thermal conductivity. This can reduce the transmission of heat from the main body to the handle. This can help ensure that the handle remains cool to touch. This can help make the apparatus more user-friendly in hot environments.

Preferably the main body comprises a flattened surface. Preferably the handle is provided adjacent the flattened surface. The flattened surface may be the back of the apparatus. The handle may be provided on the top of the apparatus, towards the back. This can make it easier for the apparatus to be carried as part of a pair together, for example back-to-back, with another apparatus. In other words, the handles of both apparatuses may be next to one another, facilitating ease of holding with a single hand.

The main body may be formed from a material incorporating anti-static compounds. This can help reduce the attraction of particles such as contaminants to the main body. This can also make the apparatus suitable for use in hazardous areas such as on oil rigs. The main body may be formed from plastic. The main body may be formed from blown plastic, for example ABS (acrylonitrile butadiene styrene). Preferably the anti-static compounds are incorporated within the plastic forming the main body.

Preferably the apparatus comprises a flow meter for measuring at least one of the flow rate through the air inlet and a volume of air flowing through the air inlet at a given flow rate over a given period of time. This can mean that the flow rate during air sampling can be detected and recorded. Preferably the apparatus comprises a control means for effecting feedback control of the air drawing means in dependence on the measured flow rate. In this way, the flow rate during air sampling can be continuously monitored, and the air drawing means speed can be adjusted so as to maintain a constant, for example a pre-set, flow rate.

The apparatus may comprise a data storage device. The data storage device may be located within the chamber. This can reduce the risk of fluid such as water from damaging the data storage device. The data storage device can be a solid state storage device, flash memory, a hard disk drive or other conventional data storage device.

The apparatus may comprise data transfer means for transferring data from the data storage device. The data transfer means may be a data port. The data port may be a USB port, a serial port or other conventional port. The data transfer means may be a Wi-Fi module, a Bluetooth (TM) module, a OSM radio module or other conventional wireless or wired data transfer system.

The apparatus may comprise at least one location sensor for detecting the location of the apparatus. The location sensor may be a GPS module. This can mean that the location of the apparatus during air sampling can be detected and recorded. The location sensor may be a mobile data communication module, for example of the type used in mobile telephones. This can assist in sensing the location of the apparatus. This may be useful in situations where, for example, the OPS module is unable to provide a location.

Preferably the apparatus comprises a motion sensor for detecting motion of the apparatus. This means that the motion of the apparatus during air sampling can be detected and recorded. This can be useful to verify that the apparatus is not moved from the desired sampling location during sampling. This can be useful as a tamper protection device. The motion sensor may be a MEMS device.

The apparatus may comprise a timing module, such as a clock. This can be used to time-stamp recorded data.

According to a third aspect of the present invention there is provided a method for monitoring airborne particle concentration using an air sampling apparatus, the method comprising the steps of drawing air through an air inlet such that airborne particles are collectable by a filter head, causing the drawn air to enter a chamber, and restricting the drawn air to flow out of the chamber through an air outlet.

The method may comprise the step of drawing a measured amount of air through the air inlet.

Features of any aspect above may be provided with any other aspect. Apparatus features may be provided with the method aspect and vice versa.

Preferred features of the present invention will now be described, purely by way of example, with reference to the accompanying drawings, in which: Figure 1 shows an air sampling apparatus in accordance with an embodiment of the invention; Figure 2 shows the air sampling apparatus of Figure 1 in an alternative configuration; Figure 3 shows an exploded view of an air sampling apparatus; Figure 4 shows a partial cutaway view of the air sampling apparatus of Figure 1; Figure 5 shows a perspective view of a side of an embodiment of an air sampling apparatus; Figure 6 shows a partial perspective view of a side of an embodiment of an air sampling apparatus; Figure 7 shows a filter head assembly; and Figures 8a and Cb show cross sectional views of filter head assemblies.

Figure 1 shows an air sampling apparatus 1 for monitoring airborne particle concentration, such as the concentration of asbestos fibres in a given sampling volume.

An overview of the air sampling apparatus 1 and its use will first be given, then the particular features of the apparatus will be considered in more detail.

The air sampling apparatus 1 comprises a main body 2, a pump 26 and an air inlet 32 on the main body 2. The pump 26 is in fluid communication with the air inlet 32 such that the pump 26 can draw air through the air inlet 32.

The apparatus comprises a filter head 62 attached to the air inlet 32 via a fluid conduit 49. This is arranged so that drawing air through the air inlet 32 draws air through the filter head 62. The filter head 62 can collect airborne particles and separate them from the drawn air.

The apparatus also comprises a mast 10 which can extend to a height of between 1 m and 1 Sm above the floor. The filter head 62 can be mounted on the mast 10 so that the filter head 62 can be located between 1 m and 1.5m above the floor for air sampling (as required by regulations).

In use, the air sampling apparatus 1 is placed in a location for sampling a volume of air at that location. The mast 10 is extended (to either 1 m or 1.5m, as required) and the filter head 62 mounted on the mast (see Figure 2). The pump 26 is operated to draw air through the filter head 62. Airborne particles, such as asbestos fibres are separated from the drawn air by the filter head 62.

After a given time period, the pump 26 is stopped. The filter head 62 can be demounted from the mast 10, and the mast 10 retracted. The filter head 62 (or a portion of it) can be separated from the rest of the apparatus 1 and examined to determine the presence and concentration of airborne particles in the sampled air volume.

The apparatus 1 can then be removed from the sampling location. When removing the apparatus 1 from the sampling location, regulations require that the apparatus 1 is cleaned and/or decontaminated. This is done either by vacuuming the apparatus 1 with a suitably rated vacuum cleaner or wiping the apparatus 1 with a damp cloth.

To aid cleaning/decontamination of the apparatus 1, the present apparatus 1 is constructed to be compliant to the IF 67 rating. The relevant features which allow this rating to be achieved will be discussed in more detail below but briefly the IP 67 rating means that the apparatus 1 is both protected from ingress of dust and protected against the effects of immersion in water to a depth of between 15 cm and 1 metre.

Thus the apparatus 1 can be used in humid or damp environments and cleaned easily without risk of water ingress and consequent damage to the internal components of the apparatus 1.

Turning now to the embodiment shown in Figure 1, the apparatus 1 is ergonomically shaped and has a generally smooth outside profile. This reduces the number of protrusions, recesses and sharp corners on and around which particulate contaminants could accumulate. The apparatus 1 will therefore accumulate fewer particulate contaminants and will also be easier to clean, making the cleaning process less laborious.

The air sampling apparatus 1 shown in Figure 1 has a plastic casing which is formed from a blown plastic such as ABS (acrylonitrile butadiene styrene). The plastic incorporates anti-static compounds which may reduce the tendency of the apparatus 1 to attract particulate contaminants to the apparatus 1. The attraction of fewer particulate contaminants to the apparatus 1 may therefore make the cleaning or decontamination of the apparatus 1 less laborious.

Referring again to Figure 1, the air sampling apparatus 1 comprises a main body 2, a handle 4 which is connected to the main body 2 by handle supports 6 and an ear portion 8. The ear portion 8 is provided adjacent the main body 2. The ear portion 8 is for storing a flexible fluid conduit, as will be described in more detail below with reference to Figures 5 and 6. The ear portion 8 comprises an ear portion recess 52 within the ear portion 8 through which the exterior of a portion of the main body 2 is accessible. The filter head can be stored within the ear portion recess 52 when not in use, as will be described below.

The apparatus 1 also comprises a mast 10 recessed within the apparatus, and a display panel 12. The display panel 12 is recessed within the main body 2 and comprises a waterproof screen 14 which is flush with the surface of the apparatus. This limits the amount of water ingress into the apparatus 1 and allows for ease of cleaning of the apparatus 1.

The mast 10 will be described in more detail below. Briefly though, the mast 10 is telescopically extendable to elevate the filter head to the required height (lm or 1 Sm above the floor) for air sampling. Figure 2 shows the air sampling apparatus 1 with the mast 10 in an extended position.

Referring now to Figures 3 and 4, the apparatus 1 comprises a first body portion 20 and a second body portion 22. The first and second body portions 20, 22 form the main body 2 of the apparatus 1 and define a chamber 24. In the embodiment shown in Figure 3, the first and second body portions 20, 22 form the handle 4, handle supports 6 and the ear portion 8.

The apparatus 1 comprises a pump 26, a printed circuit board (FOB) assembly 28 and a flow meter 30. The pump 26, FOB assembly 28 and flow meter 30 are provided within the chamber 24 of the main body 2.

The apparatus further comprises an air inlet 32 which is in fluid communication with the chamber 24, and an air outlet 34 which is also in fluid communication with the chamber 24. The pump 26 is in fluid communication with the air inlet 32 and is arranged to draw air through the air inlet 32.

The chamber is sealed from the surrounding environment such that air drawn by the pump 26 through the air inlet 32 is restricted to flow out of the chamber 24 through the air outlet 34.

Thus, in this arrangement there is an air flow path into the chamber 24 through the air inlet 32 and out of the chamber 24 through the air outlet 34. The filter head 62 is provided on the air flow path upstream of the air inlet 32. The flow meter 30 is provided on the air flow path downstream of the air inlet 32.

In one embodiment the air outlet 34 is a one way valve. This reduces the risk of particulate contaminant in a sampling volume from entering the chamber 24 through the air outlet 34.

The arrangement of the first body portion 20 and the second body portion 22 allows the chamber 24 to be sealed from the surrounding environment. A first 0-ring seal 36 is provided on the second body portion 22 which cooperates with a main body seal seat 38 on the first body portion 20. This arrangement allows the construction of the apparatus 1 from a minimum number of parts, yet ensures that a good seal is provided around the chamber 24 such that dust and contaminant on the one hand and cleaning fluid such as water on the other hand are less likely to enter the chamber 24.

Since the pump 26, FCB assembly 28 and flow meter 30 are each disposed within the chamber 24, they will be protected from any potential water damage when cleaning the apparatus 1.

The apparatus 1 comprises a battery 40 for powering components of the apparatus 1. The battery 40 is, in the embodiment shown in Figure 3, provided within the main body 2 within a battery compartment 42 which is separate from the chamber 24. Access to the battery compartment 42, such as for installing or removing the battery 40, is provided via a battery compartment cover 44. Thus the apparatus 1 does not need to be disassembled to replace a battery, but rather this can be done by just removing the battery compartment cover 44.

The provision of a separate battery compartment 42 from the chamber 24 means that if the battery 40 is changed when the apparatus 1 is located in a sampling volume then potential particulate contaminant will not enter the chamber 24, but only the battery compartment 42. Thus during any later cleaning or decontamination of the apparatus 1 the cleaning required will be minimised.

Briefly, it is noted that the ability to change a battery in this way without exposing the whole of the interior of the apparatus 1 to potential contamination means that the battery can be easily changed during use of the apparatus which increases its flexibility of use. In particular, it means that the apparatus 1 is not limited to a sampling time dictated by the charge of a single battery, but the sampling time can be extended by use of multiple batteries.

A second 0-ring seal 46 is provided on a portion of the first body portion 20 surrounding the battery compartment 42 and is for cooperation with a battery compartment seal seat 48 on the battery compartment cover 44. This battery compartment seal 46 seals the battery compartment 42 against ingress of water separately from the main body seal 36 surrounding the chamber 24. This further minimises the risk of water entering and potentially damaging the apparatus 1.

Further, it is noted that the provision of a separate battery compartment 42 and chamber 24 means that even in the event of leakage through one seal, for example leakage into the battery compartment 42, there is minimal risk that the leak will enter the remainder of the apparatus. This limits the potential damage caused by the leak.

The ear portion 8 will now be described with reference to Figures 5 and 6. The oar portion 8 provides storage for the flexible fluid conduit 49 when not in use. In this embodiment, the flexible fluid conduit 49 is a plastic tube. The tube 49 can be wound around the ear portion 8 which avoids it catching or snagging when the apparatus 1 is being stored or transported.

The ear portion 8 comprises a lip 50 around the edge of the ear portion 8 distal from the main body 2. This lip retains the tube 49 on the ear portion 8.

The air inlet 32 and the air outlet 34 are provided on the main body 2 of the apparatus 1 within the ear portion recess 52. This protects the air inlet 32 and the air outlet 34 from potential damage when the apparatus 1 is being stored and transported.

The ear portion 8 comprises an opening 54. In one embodiment (see Figure 5), the opening 54 is provided adjacent the air inlet 32. In another embodiment (see Figure 6), the opening 54 is provided opposite the air inlet 32. In both instances the location of the opening 54 in the ear portion 8 minimises the length of tube 49 needed to extend from the air inlet 32 through the opening 54, and reduces the risk of potentially damaging sharp bends occurring in the tube 49.

The opening 54 is provided towards the top of the ear portion 8. This is because, in use, the tube 49 will extend upwards relative to the apparatus 1 and the location of the opening 54 in this position minimises the length of tube 49 needed.

When stored, the tube 49 is wrapped around the ear portion 8 and can pass into the ear portion recess 52 via an additional opening 56. The additional opening 56 is provided towards the bottom of the ear portion 8 and, as shown in Figure 5, is provided towards one side of the bottom of the ear portion 8. The provision of the additional opening 56 allows the tube to pass into the ear portion recess 52 such that the filter head can be located in a storage position within the ear portion recess 52.

The filter head is part of a filter head assembly, which will now be described with reference to Figures 7 and 8. The filter head assembly 60 comprises the filter head 62 and a filter head holder 64. The filter head 62 is attached to the filter head holder 64 by a friction fit. In other embodiments, a screw fit or other appropriate fitting can be used. This allows easy replacement of the filter head 62.

The filter head holder 64 supports the filter head 62 in a downwards facing position. The filter head 62 is connected to the tube 49, and the tube 49 passes through a first aperture 66 and a second aperture 68 in the filter head holder 64.

The filter head holder 64 comprises a support portion 70 provided between the first and second apertures 66, 68 which supports the tube 49 in a continuous curve thus minimising the risk of damage to the tube 49.

The filter head holder 64 comprises a base portion 72. The filter head holder 64 defines a generally longitudinal axis along its length. The first and second apertures 66, 68 are aligned at an angle to the longitudinal axis. This allows easy location of the tube 49 when the filter head assembly 60 is located in the storage position. This also allows for secure location of the filter head holder 64 within the ear portion recess 52 taking account of the diameter of the filter head 62 which might extend beyond the width of the filter head holder 64 (or the base portion 72 thereof).

The base portion 72 of the filter head holder 64 comprises holding portions 74 at each end of the base portion 72. The holding portions 74 frictionally engage with an inside of the ear portion 8. This allows for quick and easy insertion and removal of the filter head assembly 60 from the ear portion recess 52 whilst ensuring that the filter head assembly 60 remains secure when located in the storage position.

Referring to Figures 5 and 6, a portion of the inside of the ear portion 8 comprises sides that are generally parallel to one another. These generally parallel portions are towards the lower half of the ear portion 8. The provision of these generally parallel portions means that the filter head assembly 60 can be located at a number of vertical positions within the ear portion 8 so as to accommodate different length tubes 49 with a minimal amount of slack when stored and so as to accommodate different sized filter heads 62.

Referring to Figures 5 and 7, in one embodiment the inside of the ear portion 8 has a generally vertical recess 76 and the holding portions 74 have a generally vertical protrusion 78 for cooperation with the recess 76 of the inside of the ear portion 8. Thus the filter head assembly 60 may be snap-fitted within the ear portion recess 52. This provides both a tactile feedback to an operator when storing the filter head assembly 60 and also provides more secure storage of the filter head assembly 60.

Referring to Figure 6, in another embodiment the inside of the ear portion 8 is provided with a plurality of slots 80 for supporting the filter head assembly 60 at a number of vertical positions. The holding portions 74 slide within the slots 80 for location of the filter head assembly 60 in the storage position.

The slots 80 comprise recesses and the holding portions 74 comprise protrusions (not shown). When the filter head assembly 60 is moved into the storage position, the holding portion 74 will slide along the slot 80 and the protrusion will engage with the recess of the slot 80. This allows a more secure location of the filter head assembly 60 within the storage position and provides a tactile feedback to an operator when locating the filter head assembly 60 in the storage position.

The filter head holder 64 comprises a mounting portion 84 for cooperation with the mast 10 when mounting the filter head assembly 60 in a position for use.

Figures 8a and 8b show alternative configurations of a filter head assembly.

Referring to these figures, the mounting portion 84 comprises a blind hole in the filler head holder 64 within which a portion of the mast 10 can be received to support the filter head assembly 60.

Referring again to Figure 1, the mast 10 comprises a ball shaped mount 86 atan end of the mast 10 distal from the apparatus 1. The ball shaped mount 86 cooperates with the mounting portion 84 of the filter head holder 64 so that the filter head assembly 60 can quickly and easily be mounted on the mast 10 for deployment and similarly can quickly and easily be taken off the mast 10 for storage.

The apparatus 1 comprisos a first mast attachment means 88 provided in the main body 2 for attaching the mast to the main body 2. The first mast attachment means 88 comprises an internally threaded portion which cooperates with an externally threaded second mast attachment means 90 at the base end of the mast 10. Thus the mast 10 can securely be located within the main body 2 and can quickly and easily be removed for replacement and/or cleaning.

As can be seen from Figures 1, 5 and 6, the back of the apparatus 1 is flattened, and the handle 4 is provided towards the back. This allows a pair of apparatuses 1 to be carried back-to-back easily.

Conventionally, before using an air sampling apparatus a flow meter will be connected to the air inlet for measuring the flow rate. The flow meter will then be disconnected and the air sampling apparatus will be used within the volume to be sampled. Once the air sampling has finished the flow meter will again be connected to the inlet of the apparatus for measuring the flow rate again. If the flow rates measured before and after the sampling are the same it is generally assumed that the flow rate will not have changed during the air sampling.

However the flow rate might be variable and this can therefore lead to inaccuracies in the measured particulate concentrations.

In the present embodiment, the flow meter 30 is provided within the chamber 24 for measuring the flow rate through the air inlet 32. Thus the flow rate can be continuously monitored during air sampling. The flow meter 30 also enables measurement of the volume of air flowing through the air inlet at a given flow rate over a given period of time. This can increase confidence in the measurement of particulate contaminant concentrations obtained by the air sampling apparatus 1.

The apparatus 1 also comprises a control means 28 for effecting feedback control of the pump 26 in dependence on the measured flow rate. Thus the flow rate can be monitored during sampling and the pump speed adjusted as necessary to ensure that a constant flow rate is maintained. Alternatively a particular flow rate profile can automatically be maintained during a given time period.

The apparatus 1 comprises a data storage device. In the present embodiment this is incorporated in the PCB assembly 28, though in an alternative embodiment it might be a separate module. The data storage device 28 can store such data as the measured flow rate throughout the sampling time.

A data port (not shown) can be provided for transferring data from the data storage device 28. Thus, after sampling, data relating to the sampling can be analysed by an operator to ensure that the operation of the apparatus 1 was within the required operational tolerances. In this way, if there was a failure during the sampling, the present embodiment would allow this failure to be detected and the sampling could be run again.

Air sampling is typically carried out at a number of locations in and around a site.

For example, sampling might be carried out within a sealed volume within a building containing asbestos. Air sampling may also be carried out at a location remote from this sealed volume, such as at the edge of a site, to ensure that there has been no escape of asbestos into the environment. Thus it is desirable to be able to pinpoint the location at which the sampling was taken for the purpose of data analysis.

Conventionally, an operator will simply place an apparatus at an agreed location so as to sample a volume of air at that location. In practice, the location of the air sampling apparatus may not be precisely known. This could be because the agreed location is unsuitable for placing an air sampling apparatus, for example it might have an uneven surface and an operator may therefore need to move a short distance away from the agreed location so as to securely place the air sampling apparatus. Such slight differences in the location of the apparatus might go unreported and/or unaccounted for when analysing the data. This can lead to potential inaccuracies.

The present air sampling apparatus 1 comprises a OPS module for detecting the location of the apparatus 1. In the present embodiment, the GPS module is incorporated in the PCB assembly 28, but in other embodiments a separate OPS module could be provided. The GPS module 28 is arranged to detect the location of the air sampling apparatus 1 at various points in time and/or continuously during the air sampling and to record such data on the data storago device 28 for later analysis.

In some cases, such as location in basement areas or within some buildings, it may not be possible to obtain a GPS signal. Thus the present apparatus 1 also comprises a mobile data communication module, for example of the type used in mobile telephones. In the present embodiment, the mobile data communication module is incorporated in the PCB assembly 28, but in other embodiments a separate mobile data communication module could be provided. Thus where the mobile data communication module is able to receive a signal, and the GAS module is not, it is still possible to obtain a location from the mobile data communication module and to store this on the data storage device 28. This can of course be used in addition to, as well as instead of, the GPS module.

The present apparatus 1 comprises a motion sensor (not shown) for detecting motion of the apparatus 1. Thus the motion of the apparatus 1 during air sampling can be detected and recorded on the data storage device 28 for later analysis.

When sampling an air volume, the apparatus 1 might be placed on an operative part of the building site. It may therefore become necessary to move the apparatus 1 during air sampling. Such movement could affect the results of the air sampling. It is therefore desirable to know if and when the air sampling apparatus 1 was moved during a sampling run. The motion sensor is also useful as a tamper detection device to ensure that the apparatus 1 is not interfered with during a sampling run. In one embodiment, the motion sensor is a MEMS device, which allows for the provision of a motion sensor which does not lead to an increase in the size of the apparatus 1.

Claims

Claims 1. An air sampling apparatus for monitoring airborne particle concentration, the apparatus comprising a main body having a chamber therein, an air inlet in fluid communication with the chamber, an air drawing means disposed within the chamber, the air drawing means being in fluid communication with the air inlet for drawing air through the air inlet and through a filter head for collection of airborne particles, and an air outlet in fluid communication with the chamber, wherein the chamber is sealed from the surrounding environment such that air drawn through the air inlet is restricted to flow out of the chamber through the air outlet.
2. An air sampling apparatus according to claim 1 in which the air outlet is a one way valve.
3. An air sampling apparatus according to claim 1 or claim 2 in which the main body comprises a first body portion and a second body portion which define at least a portion of the chamber.
4. An air sampling apparatus according to claim 3 in which the main body comprises a main body seal for sealing between the first body portion and the second body portion.
5. An air sampling apparatus according to any preceding claim in which the main body comprises a battery compartment for housing a battery, which battery compartment is separate from the chamber.
6. An air sampling apparatus according to claim 5 in which the apparatus comprises a battery compartment cover for covering the battery compartment and a battery compartment seal for sealing between the main body and the battery compartment cover.
7. An air sampling apparatus according to any preceding claim in which the apparatus is arranged so that the air drawing means can be powered by at least one of a battery and an external electrical connection.
8. An air sampling apparatus according to any preceding claim in which the main body has a generally smooth exterior.
9. An air sampling apparatus according to any preceding claim in which the apparatus comprises a display panel comprising a waterproof screen.
10. An air sampling apparatus according to claim 9 in which the display panel is recessed into the apparatus so that the waterproof screen is flush with the surface of the apparatus.
11. An air sampling apparatus according to any preceding claim in which the air inlet is connectable to the filter head through a flexible fluid conduit, and the apparatus comprises an ear portion for receiving the flexible fluid conduit thereon.
12. An air sampling apparatus according to claim 11 in which the ear portion is provided adjacent the main body and comprises a lip distal from the main body for retaining the fluid conduit.
13. An air sampling apparatus according to claim 11 or claim 12 in which the ear portion comprises an ear portion recess within the ear portion.
14. An air sampling apparatus according to claim 13 in which the ear portion recess exposes a portion of the main body.
15. An air sampling apparatus according to claim 14 in which at least one of the air inlet and the air outlet is provided on the main body such that it is located within the ear portion recess.
16. An air sampling apparatus according to any preceding claim in which the apparatus comprises a mast-receiving recess for receiving a mast.
17. An air sampling apparatus according to claim 16 in which the apparatus comprises a mast received in the mast-receiving recess.
18. An air sampling apparatus according to any preceding claim in which the apparatus comprises a filter head assembly.
19. An air sampling apparatus according to claim 18 in which the filter head assembly comprises a filter head and a filter head holder.
20. An air sampling apparatus according to claim 19 in which the filter head holder comprises a first aperture and a second aperture, each for receiving a portion of the fluid conduit therethrough.
21. An air sampling apparatus according to claim 19 or claim 20 in which the filter head holder comprises a support portion.
22. An air sampling apparatus according to any of claims 19 to 21 in which the filter head holder comprises at least one holding portion for holding the filter head holder in a storage position.
23. An air sampling apparatus according to claim 22 in which the storage position is within the ear portion recess.
24. An air sampling apparatus according to claim 23 in which the ear portion comprises at least one slot for receiving at least a portion of the filter head holder.
25. An air sampling apparatus according to claim 24 in which the slot is provided on an inside of the ear portion.
26. An air sampling apparatus according to claim 25 in which at least a portion of opposite sides of the inside of the ear portion are generally parallel.
27. An air sampling apparatus according to any of claims 24 to 26 in which the holding portion is provided with an engagement portion for engaging with the slot.
28. An air sampling apparatus according to any of claims 1110 27 in which the ear portion comprises an opening for receiving therethrough a portion of the fluid conduit.
29. An air sampling apparatus according to claim 28 in which the opening is provided towards the top of the ear portion.
30. An air sampling apparatus according to any of claims 1110 29 in which the ear portion comprises an additional opening for receiving therethrough a portion of the fluid conduit.
31. An air sampling apparatus according to claim 30 in which the additional opening is provided towards the bottom of the ear portion and towards one side of the ear portion.
32. An air sampling apparatus according to any of claims 20 to 31 in which the first and second apertures are aligned along a line diagonal to a notional longitudinal axis defined by the filter head holder.
33. An air sampling apparatus according to any of claims 18 to 32 in which the filter head assembly comprises a mounting portion for mounting the filter head assembly on or to the mast.
34. An air sampling apparatus according to any of claims 17 to 33 in which the mast comprises a mount on which the filter head assembly is mountable.
35. An air sampling apparatus according to any preceding claim in which the main body comprises a flattened surface.
36. An air sampling apparatus according to any preceding claim in which the apparatus comprises a handle spaced from the main body.
37. An air sampling apparatus according to claim 36 in which the handle is provided adjacent the flattened surface.
38. An air sampling apparatus according to any preceding claim in which the main body is formed from a material incorporating anti-static compounds.
39. An air sampling apparatus according to any preceding claim in which the apparatus comprises a flow meter for measuring at least one of the flow rate through the air inlet and a volume of air flowing through the air inlet at a given flow rate over a given period of time.
40. An air sampling apparatus according to any preceding claim in which the apparatus comprises a data storage device.
41. An air sampling apparatus according to any preceding claim in which the apparatus comprises at least one location sensor for detecting the location of the apparatus.
42. An air sampling apparatus according to any preceding claim in which the apparatus comprises a motion sensor for detecting motion of the apparatus.
43. A method for monitoring airborne particle concentration using an air sampling apparatus, the method comprising the steps of drawing air through an air inlet such that airborne particles are collectable by a filter head, causing the drawn air to enter a chamber, and restricting the drawn air to flow out of the chamber through an air outlet.
44. An air sampling apparatus substantially as shown in and/or as hereinbefore described with reference to the accompanying drawings.