GB2462596A - Ambient temperature alarm using averaged temperatures to detect abnormal temperature changes - Google Patents
Ambient temperature alarm using averaged temperatures to detect abnormal temperature changes Download PDFInfo
- Publication number
- GB2462596A GB2462596A GB0814606A GB0814606A GB2462596A GB 2462596 A GB2462596 A GB 2462596A GB 0814606 A GB0814606 A GB 0814606A GB 0814606 A GB0814606 A GB 0814606A GB 2462596 A GB2462596 A GB 2462596A
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- United Kingdom
- Prior art keywords
- alarm
- ambient temperature
- temperature
- microcontroller
- living space
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 230000002159 abnormal effect Effects 0.000 title 1
- 230000001960 triggered effect Effects 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 2
- 238000009529 body temperature measurement Methods 0.000 abstract 2
- 230000004913 activation Effects 0.000 description 13
- 238000001994 activation Methods 0.000 description 13
- 238000001514 detection method Methods 0.000 description 8
- 230000003213 activating effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000009849 deactivation Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 101150055297 SET1 gene Proteins 0.000 description 1
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- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 230000000630 rising effect Effects 0.000 description 1
- 230000035943 smell Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K3/00—Thermometers giving results other than momentary value of temperature
- G01K3/02—Thermometers giving results other than momentary value of temperature giving means values; giving integrated values
- G01K3/04—Thermometers giving results other than momentary value of temperature giving means values; giving integrated values in respect of time
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K3/00—Thermometers giving results other than momentary value of temperature
- G01K3/08—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values
- G01K3/10—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values in respect of time, e.g. reacting only to a quick change of temperature
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Alarm Systems (AREA)
- Emergency Alarm Devices (AREA)
Abstract
An indoor Living space ambient temperature sensitive alarm system repeatedly measures ambient temperature, stores a first set of two or more ambient temperature measurements and uses these to calculate a first average temperature value. A second set of two or more temperature measurements is then used to calculate a second average temperature value. These two average values are compared to determine a differential, if this differential exceeds a predetermined amount then an alarm is sounded. The alarm is able to detect the change in temperature in a living space due to a door or window having been left open. A display can show both a current temperature and a temperature when the alarm was triggered. An alarm may also be triggered if a rise in temperature is followed by another rise after a delay period, or if a fall in temperature is followed by another fall in temperature after a delay period.
Description
A TEMPERATURE SENSITIVE ALARM SYSTEM
F ield of the Invention The invention relates to a temperature sensitive alarm system and in particular to systems for detecting open entrances and windows in a building.
Review of Art known to the Applicant The closest art known to the applicant is the applicant's previously granted patent GB 2434019. This previous patent does not show or suggest any of the following features: * a more accurate solution to determining transient temperature changes, such as a draft, incorporating the use of sampLing the ambient temperature; * an alarm delay, which suspends the alarm activation within the system, when requested by the user; * Incorporating a wired interface for enabling the system to be connected to a third party "wired to wire free" bell push converter; * A display for informing the user of the ambient temperature, and to inform the user when the system as entered an alarm state.
Incorporating these features would provide a combined synergistic effect which is new and inventive over the applicant's aforementioned granted patent.
V
Summary of the Invention
in a first broad independent aspect, the invention provides an indoor living space ambient temperature sensitive alarm system comprising: * means for generating an alarm; * means for iteratively detecting ambient temperature values; * means for storing information representative of a first set of two or more iterations of ambient temperature detection; * means for obtaining a first average temperature value for a first set of two or more iterations representative of detections of the ambient temperature; * means for storing information representative a second set of two or more iterations of ambient temperature detection; * means for obtaining a second average temperature value for a second set of two or more iterations representative of detections of the ambient temperature; * means for comparing said averages; * means for activating said alarm if said comparison determines a differential which exceeds a predetermined amount.
This configuration is particularly advantageous because the system senses the temperature of the air in an enclosed environment. The system can determine whether temperature increase or decrease is caused by an open window / door that has been opened temporarily, or an open window / door being open permanently. Therefore, the system wilt not activate any alarms if a temperature variation is caused by a temporary draft.
However the system will activate an alarm if a temperature variation is caused by a permanently open window / door, which informs the system user of the resulting energy loss, It will not generate any false alarms when a window door is momentarily opened or closed.
Another advantage of the configuration is that it enables a more accurate and responsive means for monitoring the ambient temperature and determining whether or not any temperature variation is due to a temporary draft or a permanent draft. its performance may be adjusted by varying the differential threshold.
In a subsidiary aspect in accordance with the invention's first independent aspect, said system further comprises a means for detecting a stimulus for deactivating said system.
This configuration is particularly advantageous because the system will deactivate itself after detecting an input from a user interface, typically a push button switch. Upon receiving an input the system wilt deactivate the alarm, which wilt subsequently deactivate any audio devices. This may be particularly useful when undertaking domestic jobs such as shopping or bringing supplies into a house without activating an alarm whenever a door or window is left open for a short period of time.
In a further subsidiary aspect, said stimulus initiates the deactivation of said alarm for a predetermined time period.
This configuration is particularly advantageous because the system will deactivate itself for a predetermined time period. The predetermined time period may be an extendable time period, which is particularly useful when undertaking domestic jobs that require leaving a window or door open for long periods. Such as taking delivery of furniture or venting an unpleasant smells or gases etc. In a further subsidiaiy aspect, said alarm is reactivated within a set time period has lapsed.
This configuration is particularly advantageous because the system will ensure the alarm is automatically reactivated after a period of deactivation, therefore eliminating the possibility of the system not being reactivated manually.
In a further subsidiary aspect, said system incorporates a wired interface which communicates said alarm activation to one or more transmitter devices.
This configuration is particularly advantageous because it enables the system to connect and communicate with third party RF sender units, therefore not limiting the system to any one type or manufacturer of RF senders.
Another advantage of this configuration is that it eliminates the requirement for any wiring installation.
in a further subsidiary aspect, said system further comprising a means for wiretessLy transmitting one or more signals to one or more remote devices.
This configuration is particularly advantageous because it enables the system to communicate the alarm over a larger area, or an installation when compared with a single remote device4 In a further subsidiary aspect, said system further comprising means for displaying the current ambient temperature prior to the activation of said alarm, This configuration is particularly advantageous because it enables the user to visually verify the ambient temperature of the room without being prompted by the activation of the alarm system.
In a further subsidiary aspect said system alternates the displaying of the ambient temperature prior to the activation of said alarm with the displaying of the ambient temperature after the activation of said event.
This configuration is particularly advantageous because the system informs the user of the pre-atarm temperature and the worst case temperature, which has triggered the threshold for activating the alarm. This provides the system user with an indication of the amount of energy loss due to the window or door being left open.
In a further subsidiary aspect, activation of said alarm initiates said alternating for a predetermined time period.
This configuration is particularly advantageous because it enables the system user to enter an extendable time period for displaying the ambient temperature values to the user. For example, if the user is not working in close proximity to the system, the alternating display may be required to run for a longer period to ensure that the user or any other person within the system's vicinity is alerted to the fact that the system is in an alarm state. Also, lithe user is working in a close proximity to the system, the alternating display may be required to run for a shorter period for alerting the system users to the fact that the system is in an alarm state.
Another advantage of this configuration is the display alternating time period may be kept to a minimum, to enable the system user to monitor actual ambient temperature with minimal alarm interference.
In a further subsidiary aspect, said system further comprising a means for externally w communicating with one or more computer devices.
This configuration is particularly advantageous because it enables the system to communicate to an external computer network, in which resides dedicated environmental monitoring software. The system will uploading data which is represents the logging of all the temperature readings and fluctuations to the monitortng software. The system will also log all alarm activations and will be able to interrogate other systems to determine the cause the cause of the alarm activation, such as a window or door being left open.
In a further subsidiary aspect, further comprising a means for said system to be powered by said one or more computer devices.
This configuration is particularly advantageous because it enables the system to be powered directly from a connection to a local computer or computer network. This eliminates any dependencies upon internal power sources, such as battery cells devices.
Such connections to a PC may be in the form of a universal serial bus (USB), which provides both communication and power from the computer to system. This may be of further advantage to large installations in offices, government buildings, cold storage facilities, server rooms, hospitals and factories where there may be many devices over a large area which requires power.
In a further subsidiary aspect, said system further comprising a means for switching an interface to one or more external systems.
This configuration is particularly advantageous because it will activate a relay switch when the alarm is triggered. The relay switch is subsequently connected to a third party monitoring system, such as a security system. The operation of the relay switch wilt communicate the alarm event to the third party monitoring system.
In a further subsidiary aspect, said system further comprising a means for audibly communicating the activation of said alarm, This configuration is particularly advantageous because it will activate an audible device when the alarm is triggered. The audible device may be typically a piezo sounder or a beeper, which broadcasts a sound to attract the attention of any users within or nearby the vicinity of the system.
In a further subsidiary aspect, the components are provided in a single wall-mountable unit.
This configuration is particularly advantageous because the system may be incorporated into self contained, single unit, which avoids the necessity of installing separate independent boxes. The system can be located virtually on any interior wall without the limitations of transmission range which are inherent within a RF door arrival system.
In a second broad independent aspect, the invention provides an indoor living space ambient temperature sensitive alarm system comprising: * means for generating an alarm; * means for detecting a drop or a rise in ambient temperature; * means for delaying the triggering of the generation of said alarm for a period; * means for triggering the generation of said alarm if at the end of the period so the temperature is still dropping or rising; and * means for preventing the activation of said alarm when a rise is followed by a drop -or a drop is followed by a rise -and the time period between the one and other is less than a predetermined duration.
This configuration is particularly advantageous because it prevents the system from activating the alarm when it detects temporary variation within the ambient temperature1 due to a draft of cool or warm air. This may be the result of a window or door being opened and closed within the monitored room and is therefore not relevant.
In a further broad independent aspect, the invention provides a method of controlling an indoor living space ambient temperature sensitive alarm comprising the steps of: * Generating an alarm; * iteratively detecting ambient temperature values; * Storing in formation representative of a first set of two or more iterations of ambient temperature detection; * Obtaining a first average temperature value for a first set of two or more iterations representative of detections of the ambient temperature; * Storing information representative a second set of two or more iterations of ambient temperature detection; * Obtaining a second average temperature value for a second set of two or more iterations representative of detections of the ambient temperature; * Comparing said averages; * Activating said alarm if said comparison determines a differential which exceeds a predetermined amount
Brief Description Qf the Figures
Figure 1 shows a system block diagram representing the components of the indoor Living space ambient temperature sensitive alarm system.
Figure 2 shows a system block diagram representing the components of an alternative embodiment of the indoor Living space ambient temperature sensitive alarm system.
Figure 3 shows a flow diagram representing the functionality of the indoor Living space ambient temperature sensitive alarm system.
Figure 4 shows a front perspective view of a device incorporating the indoor living space ambient temperature sensitive alarm system.
Figure 5 shows a rear perspective diagram of a device incorporating the indoor Living space ambient temperature sensitive alarm system.
Figure 6 shows a circuit diagram for an alternative embodiment of the indoor living space ambient temperature sensitive alarm system.
Detailed Description of the Figures
Figure 1 shows a system block diagram of an indoor living space ambient temperature sensitive alarm system 1. The system I incorporates a microcontroller device 2, a two wire interface 3, a temperature sensor 4 and pushbutton 5. The system 1 may alternatively incorporate a microprocessor instead off or additionally to the microcontroller device 2.
The system 1 is shown as a singLe unit embodiment of the inventions which detects the ambient temperature within a room. The ambient temperature is sensed by a temperature sensor 4, which is connected to the microcontroller 2. The microcontroller 2 is connected to the two wire interface 3. The microcontroller 2 is also connected to a pushbutton device 5. The sensor 4 is typically of a device for detecting ambient temperature, such as a thermocouple device. The microcontroller 2 is typically a device, such as a PlC 18F65 j90, which incorporates an internal clock, internal memory and alarm. The two wire interface 3 is typically a conventional terminal block and the push button S is typically a device, such as a single-push type.
The system 1 initialises itself when it is initially powered. Upon completion of the system's initialisation, the microcontroller 2 will call up a routine for obtaining information in regards to the ambient temperature within a room, via sampling the temperature sensor 4. The microcontroLler 2 wiLl acquire the information on the basis of an iterative cycle.
Each cycle is driven from a timer embedded within the microcontroller 2. The information sampled during each cycle is grouped together in sets and stored within the microcontroller 2, Each set is typically representative of two or more cycles. The microcontroller 2 will call up routine which calculates an average ambient temperature value for each set stored.
The microcontroller 2 continually samples the ambient temperature within the room at a predetermined cyclic rate. The rriicrocontrotler 2 will continuously group the ambient temperature information together into sets and store them within the microcontroller 2.
The microcontroller 2 will continuously calculate the average ambient temperature for each set stored. The microcontroller 2 will call up a routine which compares the average value for the most recently stored set1 with the average value of previously stored sets.
The microcontroller 2 will then determine the differential amount between the two average values. if the differential amount is beyond a predetermined size, the microcontroller 2 will call up an alarm routine which activates an alarm embedded within the microcontroller 2.
Therefore, if the differential amount is below the predetermined size, the microcontroller 2 will not call up the alarm routine for activating the embedded alarm. The differential amount wilt then be regarded as representative of a draft which may be result of a window or door being opened briefly. If the differential amount exceeds the predetermined amount, it wilt regarded as representative of a window or door being left open and activating an alarm to bring this to the system user's attention. Eor example. a temperature differential > 2° Celsius in a time period of less than 60 seconds will cause the microcontroller 2 to activate its internal alarm. The microcontroller 2 will then communicate the alarm event to the two wire interface 3, typically in the form of a small two-way terminal block, to enable the system to communicate the alarm event to a Radio Frequency (RF) interface module 6. The radio frequency (RF) interface module 6 will then subsequently activate the remote audio device 7, typically a remote door chime unit, for alerting the system user. The two wire interface 3 prDvides a "wired to wire free" solution, which enables a wire free alarm to be connected to the system. The two wire interface provides a generic interface which is not dependent upon the cooperation of doorbell manufacturers to include their RF sender units within the system. The incorporation of a two wire interface 3 enables the system to use generic "wire to wire free" RF senders which are not manufacturer specific.
The system's accuracy and responsiveness is dynamically adjustable by increasing or decreasing the time period between the acquired samples. For example, by increasing the time period the system's response is sLowed and its accuracy is reduced. By decreasing the time period the system's response is accelerated and its accuracy increased.
The temperature differential detects both increases and decreases in the ambient temperature being monitored within a room. The differential valve is used to activate an alarm and may be reduced if a more accurate threshold is desired. If you require the system to be less sensitive or (desensitised) this may be easily achieved by increasing the time period between obtaining samples for the ambient temperature. Also, if it is your requirement to make the system more sensitive to smaller fluctuations, you may do this by decreasing the time period between the obtained samples.
In an alternative embodiment of the invention, the indoor living space ambient temperature sensitive alarm system may incorporate a user interface to enable the system's user to enter data attributes required for configuring the system, such as predetermined time periods and ambient temperature differential threshold. The user interface is typically a one button device for selecting and setting the systems parameters.
In a further alternative embodiment of the invention, the indoor living space ambient temperature sensitive alarm system, which incorporates all the core system components, apart from a display device and door bell interface may be incorporated within another object due to its reduced size. The system may be powered from a miniature battery and incorporated within novelty objects such as children's soft toys, planetary globes and etc. Figure 2 shows an alternative embodiment of the invention, the microcontroller 2 incorporates a display device 8, which displays to the user the current ambient temperature. When the microcontroller 2 detects that the ambient temperature has increased or decreased beyond a predetermined amount, the microcontroller 2 will call up an alternating display routine. The alternating display routine alternates the temperature being displayed on the display device 8, The alternating display routine alternates between the pre alarm ambient temperature and the worst case ambient temperature which exceeds the predetermined amount. The alternating display routine is intended to provide the system's user with an indication of the amount of energy lost, due to the window or door being Left open. For example, if the microcontroller 2 activates the alarm, the display device S will alternate between the previous ambient temperature prior to the alarm activation and the ambient temperature which caused the alarm activation. The alternating display routine will typically alternate the display every two seconds for 30 seconds. During this alarm state, the microcontroller 2 will activate a dedicated relay output, which then subsequently activates a Radio Frequency (RF) interface module 6 via the two wire interface 3. The system 1 is also shown to incorporate an audible device 9 which is typically a piezo sounder or beeper. The audible device 8 will be activated by the microcontroller 2 when the alarm is triggered. *10
In an alternative embodiment of the invention, the alarm may be of a novel type which when activated will provide a series of beeps in Morse code to provide a message such as "SOP" (Save Our Planet) which is "... .-.".
Figure 3 shows a functional flow diagram for the indoor living space ambient temperature sensitive alarm system shown in Figures 1 and 2.
Figure 4 shows a front perspective view of the system incorporated within a single unit 10.
The system components are incorporated within a circular enclosure 11, which incorporate a front facia member 12 that is centrally convexed. The front facia member 12 incorporates a raised textured surface of a hexagonal -honeycomb effect 13. The front facia member 12 incorporates a display device 14, which is located at a near central position that is offset vertically from the facia's central point. The front facia member 12 incorporates a push button device 15, which is located at near central position that is offset downwards from the facia's central point substantially towards the facia's lower portion. The push button device is formed from a circular, coricaved portion of the front facia member 12. The circular enclosure 11 is shown to incorporate a semi domed rear portion 16.
Figure 5 shows a bottom perspective view of the system incorporated within a single unit 10. The circular enclosure 11 is shown to incorporate a lower domed portion 16 and a circular rear member 17. The circular rear member 17 is detachable from the lower domed portion 16. The circular rear member 17 is shown to be rotatable, as indicated by arrow 18. The drcular rear member 17 is shown to incorporate an oval attachment point 19 at its uppermost portion and a curved attachment slot 20 which is parallel to the rear member's outer edge 21. The lower domed portion 16 incorporates two circular, concaved portions 22 and 23 within its upper surface. The two circular recesses 22 and 23 enable the user to attach I detach the circular rear member 17 from the lower domed portion 16.
The circular rear member 17 incorporates four evenly spaced standoff portions 24 to 27 which are located within close proximity to the circular rear member's outer edge 21. The four standoff portions 24 to 27 enable the circular rear member 17 to be in even contact with a watt, Figure 6 shows an alternative embodiment of the indoor Living space ambient temperature sensitive alarm system 28 comprising analogue electronic components. The components incorporate a voltage source 29, a first stage filter circuit with gain 30, an inverting circuit 31 and a relayed secondary circuitloutput 32, Capacitor (C3) 33 is shown to be added in parallel to resistor (3) 34 in the feedback loop for the first stage filter circuit with gain to give a reduction of "transient" sensitivity as would be caused by a draught. Therefore the alarm trigger point or threshold, is at 20DB gain 35, so the circuit is sensitive to changes that take place between 5mHz (zoo seconds) 36 and 200mHz (5 seconds) 37 If the change happens in less than five seconds, the circuit is not sensitive to it and therefore does not activate the alarm. The drcuit sensitivity 39 is illustrated on the frequency response curve 38 The same effect may be achieved by using a "slow" sensor or "insulating" the sensor by the design of the housing. This may also be achieved by dipping the sensor into a coating material to slow it down.
The scope of the invention is defined in the following claims.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0814606A GB2462596B (en) | 2008-08-11 | 2008-08-11 | A temperature sensitive alarm system |
| GB0913625A GB2462527B (en) | 2008-08-11 | 2009-08-05 | An indoor living space ambient temperature sensitive alarm system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0814606A GB2462596B (en) | 2008-08-11 | 2008-08-11 | A temperature sensitive alarm system |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0814606D0 GB0814606D0 (en) | 2008-09-17 |
| GB2462596A true GB2462596A (en) | 2010-02-17 |
| GB2462596B GB2462596B (en) | 2010-07-21 |
Family
ID=39790561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0814606A Expired - Fee Related GB2462596B (en) | 2008-08-11 | 2008-08-11 | A temperature sensitive alarm system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2462596B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3376189A1 (en) * | 2017-03-14 | 2018-09-19 | ABB Schweiz AG | Sensor system for detecting air or heat flows due to open window, doors and/or other closable openings in a building room |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2209086A (en) * | 1987-08-26 | 1989-04-26 | Hochiki Co | Fire discriminating apparatus |
| US5483222A (en) * | 1993-11-15 | 1996-01-09 | Pittway Corporation | Multiple sensor apparatus and method |
| US5612674A (en) * | 1995-01-05 | 1997-03-18 | Pittway Corporation | High sensitivity apparatus and method with dynamic adjustment for noise |
| GB2434019A (en) * | 2006-12-12 | 2007-07-11 | Mervyn Porter | Temperature alarm with time delay able to warn of open widows or doors |
-
2008
- 2008-08-11 GB GB0814606A patent/GB2462596B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2209086A (en) * | 1987-08-26 | 1989-04-26 | Hochiki Co | Fire discriminating apparatus |
| US5483222A (en) * | 1993-11-15 | 1996-01-09 | Pittway Corporation | Multiple sensor apparatus and method |
| US5612674A (en) * | 1995-01-05 | 1997-03-18 | Pittway Corporation | High sensitivity apparatus and method with dynamic adjustment for noise |
| GB2434019A (en) * | 2006-12-12 | 2007-07-11 | Mervyn Porter | Temperature alarm with time delay able to warn of open widows or doors |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3376189A1 (en) * | 2017-03-14 | 2018-09-19 | ABB Schweiz AG | Sensor system for detecting air or heat flows due to open window, doors and/or other closable openings in a building room |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2462596B (en) | 2010-07-21 |
| GB0814606D0 (en) | 2008-09-17 |
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| PCNP | Patent ceased through non-payment of renewal fee |
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| S28 | Restoration of ceased patents (sect. 28/pat. act 1977) |
Free format text: APPLICATION FILED |
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| S28 | Restoration of ceased patents (sect. 28/pat. act 1977) |
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| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20230811 |