GB2472857A - Oxygen sensor housing with self cleaning system - Google Patents

Oxygen sensor housing with self cleaning system Download PDF

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Publication number
GB2472857A
GB2472857A GB0914645A GB0914645A GB2472857A GB 2472857 A GB2472857 A GB 2472857A GB 0914645 A GB0914645 A GB 0914645A GB 0914645 A GB0914645 A GB 0914645A GB 2472857 A GB2472857 A GB 2472857A
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Prior art keywords
sensor
fluid
window
foreign
ambient environment
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GB0914645A
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GB0914645D0 (en
Inventor
Michael Riding
Jonathan Cook
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PROCESS INSTR
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PROCESS INSTR
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Priority to GB0914645A priority Critical patent/GB2472857A/en
Publication of GB0914645D0 publication Critical patent/GB0914645D0/en
Publication of GB2472857A publication Critical patent/GB2472857A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/85—Investigating moving fluids or granular solids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/85—Investigating moving fluids or granular solids
    • G01N21/8507—Probe photometers, i.e. with optical measuring part dipped into fluid sample
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/18—Water
    • G01N33/1806—Biological oxygen demand [BOD] or chemical oxygen demand [COD]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0006—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
    • G01N2021/6432—Quenching

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Immunology (AREA)
  • General Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Analytical Chemistry (AREA)
  • Pathology (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Biomedical Technology (AREA)
  • Emergency Medicine (AREA)
  • Molecular Biology (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

A sensor housing for a dissolved oxygen sensor includes an end portion which is coupled in use with a main sensor body fitting into engagement portion 121, such that a sensor window 113 of the main sensor body lies substantially coplanar with a first section 122a of an end face of the end portion. Periodically a nozzle 127 formed in raised region 122b of the end portion directs a jet of foreign cleaning fluid at and across the sensor window 113, and a control unit verifies correct operation of the sensor by comparing a measurement value from the sensor for an ambient environment against a measurement value for the foreign fluid in an exclusion spray zone 200. The housing allows the sensor window to be automatically cleaned.

Description

SENSOR HOUSING AND SENSOR OPERATING METHOD
BACKGROUND
Technical Field
The present invention relates generally to a housing for a dissolved oxygen sensor and to a method of operating a dissolved oxygen sensor.
Description of Related Art
Figure 1 is a perspective view of a dissolved oxygen (DO) sensor of the related art. The sensor 10 comprises a generally cylindrical main body 11 having an end face 12 with a sensor window 13. A cable 14 carries measurement signals from the sensor 10. The main body 11 houses the main electrical components of the sensor. In one example, the sensor 10 measures dissolved oxygen based on luminescence quenching, wherein an optical emitter and an optical detector (e.g. an LED and a photodiode) are mounted behind the window 12. In use, the sensor 10 is inserted into the environment to be measured and a measurement value is obtained from the sensor via the cable 14.
As one example, the DO sensor is installed in a waste water treatment plant, where it is important to maintain appropriate levels of dissolved oxygen to keep alive beneficial micro-organisms. Although the sensor is relatively robust, the sensor body quickly becomes dirty and accumulates a coating of organic slime and other debris. Hence, the DO sensor needs frequent (e.g. weekly) on-site maintenance, which is a costly and unpleasant task.
US-A-200810067065 (Rosemount Analytical, Inc.) mentions a DO sensor that is automatically cleaned with a blast of compressed air to remove the accumulated biological slime or sludge.
There is still a need to clean the sensor more efficiently and effectively, so that the sensor may remain operational for longer between maintenance visits. Also, there is a need to verify that the sensor is still operating correctly. Further, the sensor is vulnerable to "ragging", wherein textile debris or similar becomes wrapped around the sensor.
SUMMARY OF THE INVENTION
According to the present invention there is provided a sensor housing and a sensor operating method as set forth in the claims appended hereto. Other, optional features of the invention will be apparent from the dependent claims, and the description which follows.
In one example aspect there is provided a sensor system, comprising a control unit and a sensor which are coupled together to pass measurement values from the sensor to the control unit, wherein the sensor comprises a housing including a main body portion and an end portion which are separate and coupled together in use such that a sensor window in the main body lies substantially coplanar with a first section of the end face of the end portion, and periodically a nozzle in the end portion directs a jet of foreign fluid at and across the sensor window, and the control unit verifies correct operation of the sensor by comparing a measurement value from the sensor for an ambient environment against a measurement value for the foreign fluid.
In one example aspect there is provided a sensor housing for a dissolved oxygen sensor, comprising a generally cylindrical end portion having an end surface and a sensor window arranged in use substantially co-planar with the end surface; and a fluid delivery portion including a nozzle arranged to deliver a foreign fluid substantially parallel to the end surface and across the sensor window for cleaning the sensor window and for forming a temporary exclusion zone of the foreign fluid adjacent to the sensor window.
In one example aspect, the end surface is divided into at least first and second sections, wherein the sensor window in use lies generally coplanar with the first section and the second section is raised by a wall with respect to the first section, and wherein the nozzle is arranged in the wall.
In one example aspect, the first and second sections are both substantially planar and are arranged substantially perpendicular to a longitudinal axis of the end portion, and wherein the wall is generally parallel to the longitudinal axis and substantially perpendicular to the first and second sections.
In one example aspect, the nozzle forms a fluid jet which is directed substantially parallel across the first section of the end portion.
In one example aspect, the wall extends across the end surface with a curved configuration around the sensor window, and wherein the second section forms a plateau stepped above the first section and extending rearwards and sideways with respect to fluid jet to exclude an ambient environment from the exclusion zone of the foreign fluid.
In one example aspect, the end portion further comprises a fluid port for receiving a fluid line which carries the foreign fluid to the housing, and a channel which passes through the end portion to carry the foreign fluid through the end portion to the nozzle.
In one example aspect, the end portion is formed as a removable cap which is adapted to receive a separate main body portion.
In one example aspect, the sensor housing is arranged in use in an ambient environment and is coupled to a control unit which is arranged to measure the ambient environment using the sensor, supply the foreign fluid to the end portion such that the foreign fluid passes across a sensor window for cleaning the sensor window and forming the exclusion zone of the foreign fluid adjacent to the sensor window to exclude the ambient environment, measure the foreign fluid using the sensor, and verify correct operation of the sensor by comparing the measurement of the foreign fluid with the measurement of the ambient fluid.
In one example aspect there is provided a method of operating a dissolved oxygen sensor, comprising the steps of: providing the sensor in an ambient environment; measuring the ambient environment using the sensor; directing a jet of foreign fluid across a sensor window for cleaning the sensor window and forming an exclusion zone of the foreign fluid adjacent to the sensor window which excludes the ambient environment; measuring the foreign fluid in the exclusion zone using the sensor; and verifying correct operation of the sensor by comparing the foreign fluid measurement with the ambient fluid measurement.
In one example aspect, the step of measuring the ambient environment using the sensor comprises obtaining at least one measurement value relating to the ambient environment; the step of measuring the foreign fluid using the sensor includes taking at least one measurement value relating to the foreign fluid, while the exclusion zone is formed adjacent to the sensor window; and the step of verifying correct operation of the sensor includes obtaining a difference value based on the measurement value obtained by measuring the foreign fluid and the measurement value relating to the ambient environment, and comparing the difference value against a predetermined threshold value.
In one example aspect, the method includes dynamically determining the threshold value according to the measurement value relating to the ambient environment.
In one example aspect, the method includes reporting an outcome of the step of verifying correct operation of the sensor as a binary pass or fail indication.
BRIEF DESCRIPTION OF THE DRAWINGS
For a better understanding of the invention, and to show how exemplary embodiments may be carried into effect, reference will now be made to the accompanying drawings in which: Fig. 1 is a perspective view of a sensor housing of the related art; Fig. 2 is a perspective view of a sensor housing of an example embodiment; Fig. 3 is a perspective view of a separable cap of the sensor housing; Fig. 4 is a top view of the cap; Fig. 5 is a side view of the cap; Fig. 6 is an underneath view of the cap; Fig. 7 is a first cross-sectional view of the cap along line VIl-VIl; Fig. 8 is a second cross-sectional view of the cap along line VIll-VIll; Fig. 9 is a third cross-sectional view of the cap along line IX-IX; Fig 10 is a cross-sectional view along line VIl-VIl of the cap in use; and Fig. 11 is a flow diagram showing an example method of operating a sensor.
DETAILED DESCRIPTION OF THE EXAMPLE EMBODIMENTS
The example embodiment will be discussed in relation to a housing for a dissolved oxygen sensor. The sensor is used to measure dissolved oxygen in a measured environment, such as in a sewage treatment plant or other water processing facility. However, the dissolved oxygen sensor is also useful in many other specific environments including, for example, water quality measurement in natural waterways such as streams, rivers or lakes.
Figure 2 is a perspective view of one example embodiment of the sensor housing 100.
The sensor housing 100 includes a generally cylindrical body 110 to house electrical and/or optical components of the sensor and provide measurement signals, in this case through a cable 104 to a controller unit 200. A fluid line 105 carries a foreign cleaning fluid, such as clean water or compressed air, to the housing 100.
The housing 100 includes an end face 112 with a sensor window 113 which exposes the electrical and/or optical components of the sensor through the housing 100. In use, the cleaning fluid from the fluid line or hose 105 passes through a fluid delivery path in the housing and is directed across the sensor window 113. This jet of fluid cleans the sensor window 113 and creates an exclusion zone adjacent to the sensor window 113.
In this example, the housing 100 is divided into the main body portion 110 and a separate end portion 120. Here, the end portion 120 is formed as a removable cap which is adapted to receive the sensor body 110. Therefore, the cap 120 is easily retro-fitted to existing sensors which are held in stock or are already deployed in the field. In another example embodiment, the main body 110 and the end portion 120 are integrally formed and are not separable.
Figures 3-9 show one example embodiment of end portion or capl2O in more detail.
An engagement portion 121 is provided at one side of the cap 120 to engage with the main body 110 of Figure 2, such as with a push-fit or screw-fit engagement. The cap 120 is arranged to receive the main body 110, which passes substantially through the cap, such that the cap 120 encircles one end of the cylindrical main body 110.
The other side of the cap 120 has an end face 122 that is divided by a step into first and second planar sections 122a, 122b. The sections are both arranged substantially perpendicular to a longitudinal axis L of the cap 120 and are offset by a wall 123 or escarpment which is generally parallel to the longitudinal axis and substantially perpendicular to the planar sections 122a, 122b. Thus, the second section 122b forms a table 124 or plateau above the first section 122a. In this embodiment, the cap 120 receives the main body 110 until the sensor window 113 provided on the end face 112 is arranged substantially co-planar with the first end face section 122a of the cap 120.
A fluid port 125 receives the fluid line 105 of Figure 2, such as with a threaded engagement portion. A fluid channel 126 passes through the cap 120 to a fluid outlet or nozzle 127. As shown in the cross-sections of Figs 7, 8 and 9, the channel 126 first expands with a tapered section to a desired width and then turns through approximately 90 degrees.
Then, the channel 126 provides a parallel-sided region to reach the nozzle 127. Thus, the nozzle 127 forms a wide, flat fluid jet or spray which is directed substantially parallel across the first end face section 122a of the cap 120. In use, the nozzle 127 is generally co-planar with the end face 112 of the main body 110 and with the sensor window 113 and thus directs the jet parallel across the surface of the sensor window 113. Conveniently, the nozzle 127 has a width that substantially corresponds to the diameter of the circular sensor window 113.
Conveniently, the plateau 124 is formed by milling material away from the cap 120 so that the first lowland section 122a is stepped from the second upland section 122b. The escarpment or wall surface 123 projects generally perpendicularly with respect to the cap end face 122. Conveniently, the wall 123 is arranged across the end face 122 and passes close adjacent to the sensor window 113.
As shown particularly in Figure 4, the wall 123 suitably extends as a section line across the generally circular end face 122. However, the wall 123 has a curved configuration and is cupped around the sensor window 113. In this example, the sensor window 113 is generally circular and the wall 123 extends in an arc around a portion of the circumference of the window 113. That is, the wall 123 has a curved profile which surrounds a part of the circumference of the sensor window 113. Therefore, the wall 123 helps to direct the fluid stream from the nozzle 127. Further, the configuration of the end face 122, particularly the wall 123 and the upper section 122b, helps to exclude the ambient, measured, environment and form an effective exclusion zone of the cleaning fluid across the sensor window 113.
Figure 10 is a cross sectional view showing the end portion 110 in use. As shown in Figure 10, a suitable cleaning fluid, such as compressed air, is provided along the fluid delivery path 126 to the outlet 127 and a jet of fluid is sprayed across the first lowland end surface 122a and the sensor window 113. This fluid jet dislodges debris on the sensor window 113 to give a cleaning effect. That is, the sensor window 113 is cleaned of debris by the fluid jet.
Simultaneously, the fluid jet forms the exclusion zone 200 adjacent to the sensor window 113.
That is, the fluid jet displaces the ambient environment and is directed by the plateau 122 and the curved wall 123 to form this fluid pocket in the exclusion zone 200. When the supply of cleaning fluid is turned off, the exclusion zone 200 collapses and the sensor window 113 is again directly in contact with the ambient environment.
Figure 11 is a schematic diagram showing an example method of operating the sensor.
Here, the sensor is suitably provided according to the example embodiments discussed above.
In step 1101 the sensor 100 is inserted or located into an environment to be measured.
This ambient environment is suitably waste water.
In step 1102, the ambient environment is measured using the sensor 100 to obtain at least a first measurement value "A" relating to the ambient environment. Here, the optical and/or electrical components of the sensor 100 measure the ambient environment through the sensor window 113. Over time, the sensor window 113 will become contaminated with debris, dirt, settled particulates, slime, sludge and so on.
In step 1103, a foreign fluid, such as compressed air or clean water, is passed through the end portion 120 of the sensor housing 100 and is directed across the sensor window 113 from the nozzle 127. The jet of foreign fluid cleans the sensor window 113 and forms the exclusion zone 200 adjacent to the sensor window 113.
In step 1104, the sensor 100 takes at least one measurement value "F" relating to the foreign fluid, while the exclusion zone 200 is formed adjacent to the sensor window 113.
In step 1105, the correct operation of the sensor is verified based on the measurement value F obtained by measuring the foreign fluid and the previously recorded measurement value A relating to the ambient fluid. That is, the measurement for air or clean water F is compared against the previous measurements for waste water A of the ambient environment.
A relatively large scale of change in the measurement value is to be expected between the foreign fluid measurement F and the ambient fluid measurement A when the sensor is operating correctly. Thus, the difference D = A-F will be relatively large and greater than a predetermined threshold value T when the sensor is operating correctly. If the comparison does not reveal the expected difference, then a failure of the sensor is determined. In one example embodiment, the threshold value T is dynamically determined with respect to the ambient value A, such as from a look-up table stored in a memory of the control unit 200.
Here, the threshold value T is selected from the table according to the last obtained ambient value A. Thus, the verification process is accurately applied even across a wide variety of operating environments.
At step 1106, the verification result is reported, suitably as a binary "OK" or "FAIL" indication. Thus, the control unit 200 of Fig. 2 now has a simple and reliable mechanism to confirm that the sensor is still operating correctly, and provides effective feedback information to an operator of the system.
The many advantages of the sensor housing and the sensor operating method will be apparent from the discussion above. In particular, the sensor housing combines a self-cleaning function to improve longevity of the sensor with a verification function that confirms the continued correct operation of the sensor. The example embodiments provide a sensor that is cleaned efficiently and effectively, so that the sensor may remain operational for longer between maintenance visits. For example, it is expected that the example sensor will remain operational for up to twelve months without any manual intervention. The example embodiments automatically verify that the sensor is still operating correctly, and may report an alert when the sensor is detected to be operating abnormally. The example sensor is shaped to reduce "ragging", which minimises the risk that textile debris or similar will become wrapped around the sensor.
Although a few preferred embodiments have been shown and described, it will be appreciated by those skilled in the art that various changes and modifications might be made without departing from the scope of the invention, as defined in the appended claims.
Attention is directed to all papers and documents which are filed concurrently with or previous to this specification in connection with this application and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference.
All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive.
Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.
The invention is not restricted to the details of the foregoing embodiment(s). The invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.

Claims (5)

  1. CLAIMS1. A sensor housing for a dissolved oxygen sensor, comprising: a generally cylindrical end portion having an end surface and a sensor window arranged in use substantially co-planar with the end surface; and a fluid delivery portion including a nozzle arranged to deliver a foreign fluid substantially parallel to the end surface and across the sensor window for cleaning the sensor window and for forming a temporary exclusion zone of the foreign fluid adjacent to the sensor window.
  2. 2. The sensor housing of claim 1, wherein the end surface is divided into at least first and second sections, wherein the sensor window in use lies generally coplanar with the first section and the second section is raised by a wall with respect to the first section, and wherein the nozzle is arranged in the wall.
  3. 3. The sensor housing of claim 2, wherein the first and second sections are both substantially planar and are arranged substantially perpendicular to a longitudinal axis of the end portion, and wherein the wall is generally parallel to the longitudinal axis and substantially perpendicular to the first and second sections.
  4. 4. The sensor housing of claim 2 or 3, wherein the nozzle forms a fluid jet which is directed substantially parallel across the first section of the end portion.
  5. 5. The sensor housing of claim 4, wherein the wall extends across the end surface with a curved configuration around the sensor window, and wherein the second section forms a plateau stepped above the first section and extending rearwards and sideways with respect to fluid jet to exclude an ambient environment from the exclusion zone of the foreign fluid.7. The sensor housing of claim 1, wherein the end portion further comprises a fluid port for receiving a fluid line which carries the foreign fluid to the housing, and a channel which passes through the end portion to carry the foreign fluid through the end portion to the nozzle.8. The sensor housing of claim 1, wherein the end portion is formed as a removable cap which is adapted to receive a separate main body portion.9. The sensor housing of claim 1, wherein the sensor housing is arranged in use in an ambient environment and is coupled to a control unit which is arranged to measure the ambient environment using the sensor, supply the foreign fluid to the end portion such that the foreign fluid passes across a sensor window for cleaning the sensor window and forming the exclusion zone of the foreign fluid adjacent to the sensor window to exclude the ambient environment, measure the foreign fluid using the sensor, and verify correct operation of the sensor by comparing the measurement of the foreign fluid with the measurement of the ambient fluid.10. A method of operating a dissolved oxygen sensor, comprising the steps of: providing the sensor in an ambient environment; measuring the ambient environment using the sensor; directing a jet of foreign fluid across a sensor window for cleaning the sensor window and forming an exclusion zone of the foreign fluid adjacent to the sensor window which excludes the ambient environment; measuring the foreign fluid in the exclusion zone using the sensor; and verifying correct operation of the sensor by comparing the foreign fluid measurement with the ambient fluid measurement.11. The method of claim 10, wherein: the step of measuring the ambient environment using the sensor comprises obtaining at least one measurement value relating to the ambient environment; wherein the step of measuring the foreign fluid using the sensor includes taking at least one measurement value relating to the foreign fluid, while the exclusion zone is formed adjacent to the sensor window; and wherein the step of verifying correct operation of the sensor includes obtaining a difference value based on the measurement value obtained by measuring the foreign fluid and the measurement value relating to the ambient environment, and comparing the difference value against a predetermined threshold value.12. The method of claim 11, further comprising the step of dynamically determining the threshold value according to the measurement value relating to the ambient environment.13. The method of claim 10, 11 or 12, further comprising the step of reporting an outcome of the step of verifying correct operation of the sensor as a binary pass or fail indication.14. The method of claim 10, wherein the step of directing the foreign fluid includes passing the fluid through an end portion of the sensor to a nozzle and directing the fluid across the sensor window from the nozzle.15. A sensor housing, substantially as hereinbefore described with reference to the accompanying drawings.16. A method of operating a sensor, substantially as hereinbefore described with reference to the accompanying drawings.
GB0914645A 2009-08-21 2009-08-21 Oxygen sensor housing with self cleaning system Withdrawn GB2472857A (en)

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GB2472857A true GB2472857A (en) 2011-02-23

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3067673A1 (en) * 2015-03-09 2016-09-14 Seiko Epson Corporation Image forming apparatus and dirtiness detection method
CN106383152A (en) * 2015-07-26 2017-02-08 江苏中农物联网科技有限公司 Intelligent dissolved oxygen sensor
CN107209143A (en) * 2015-01-12 2017-09-26 艺康美国股份有限公司 Equipment for maintaining sensor accuracy

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US5563737A (en) * 1991-09-18 1996-10-08 Janesko Oy Arrangement for cleaning an optical window in a process
US5630795A (en) * 1991-08-02 1997-05-20 Olympus Optical Co., Ltd. Cleaning tube apparatus for endoscope
JPH10202207A (en) * 1997-01-28 1998-08-04 Sanyo Sokki Kk Automatic washing device by ejecting water
EP1402962A2 (en) * 2002-09-27 2004-03-31 E.I. du Pont de Nemours and Company System and method for cleaning in-process sensors
JP2007190535A (en) * 2006-01-23 2007-08-02 Dkk Toa Corp Washing device for water quality detecting device
US20080067065A1 (en) * 2006-09-18 2008-03-20 Rosemount Analytical Inc. System for calibrating dissolved oxygen analyzers using compressed fluids during cleaning

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5630795A (en) * 1991-08-02 1997-05-20 Olympus Optical Co., Ltd. Cleaning tube apparatus for endoscope
US5563737A (en) * 1991-09-18 1996-10-08 Janesko Oy Arrangement for cleaning an optical window in a process
JPH10202207A (en) * 1997-01-28 1998-08-04 Sanyo Sokki Kk Automatic washing device by ejecting water
EP1402962A2 (en) * 2002-09-27 2004-03-31 E.I. du Pont de Nemours and Company System and method for cleaning in-process sensors
JP2007190535A (en) * 2006-01-23 2007-08-02 Dkk Toa Corp Washing device for water quality detecting device
US20080067065A1 (en) * 2006-09-18 2008-03-20 Rosemount Analytical Inc. System for calibrating dissolved oxygen analyzers using compressed fluids during cleaning

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107209143A (en) * 2015-01-12 2017-09-26 艺康美国股份有限公司 Equipment for maintaining sensor accuracy
JP2018501491A (en) * 2015-01-12 2018-01-18 エコラブ ユーエスエイ インク Device for maintaining sensor accuracy
EP3245508A4 (en) * 2015-01-12 2018-10-17 Ecolab USA Inc. Apparatus for maintaining sensor accuracy
CN107209143B (en) * 2015-01-12 2020-10-16 艺康美国股份有限公司 Apparatus for maintaining sensor accuracy
EP3067673A1 (en) * 2015-03-09 2016-09-14 Seiko Epson Corporation Image forming apparatus and dirtiness detection method
US9522538B2 (en) 2015-03-09 2016-12-20 Seiko Epson Corporation Image forming apparatus and dirtiness detection method
CN106383152A (en) * 2015-07-26 2017-02-08 江苏中农物联网科技有限公司 Intelligent dissolved oxygen sensor

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