GB2255190A - Calibration of humidity sensors - Google Patents
Calibration of humidity sensors Download PDFInfo
- Publication number
- GB2255190A GB2255190A GB9105822A GB9105822A GB2255190A GB 2255190 A GB2255190 A GB 2255190A GB 9105822 A GB9105822 A GB 9105822A GB 9105822 A GB9105822 A GB 9105822A GB 2255190 A GB2255190 A GB 2255190A
- Authority
- GB
- United Kingdom
- Prior art keywords
- humidity
- calibrated
- humitrace
- calibration
- traceable
- 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
Links
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 239000012266 salt solution Substances 0.000 claims 3
- 239000012528 membrane Substances 0.000 abstract description 4
- 150000003839 salts Chemical class 0.000 abstract description 3
- 239000002002 slurry Substances 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/10—Measuring moisture content, e.g. by measuring change in length of hygroscopic filament; Hygrometers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/36—Analysing materials by measuring the density or specific gravity, e.g. determining quantity of moisture
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
A salt slurry (5) in a container (1) with a moisture vapour permeable membrane (2) produces a known humidity within a water-free chamber into which the majority of humidity sensor types (6) can be self sealed. <IMAGE>
Description
Patent Snecification of Humitrace Calibrated Humidity
A traceable portable range of humidity standards with universal fixings to accommodate majority of humidity sensor types.
Description
Humitec is a multi-walled polycarbonate or other suitable plastic container has within its construction a moisture vapour permeable membrane which creates two chambers.
The outer chamber contains a saturated salt slurry sealed by reason of the membrane from the inner chamber which is of suitable dimension to accommodate a sensor of commercially available type designed to measure relative humidity. The partial vapor pressure (RH) generated by one of a range of saturated salt slurries permeates the membrane and creates an equilibrum relative humidity within the chamber which contains the sensor under test.
Diagram and operation drawing supplied with this description.
Our claim is that due to a NAMAS calibration procedure developed and practiced by my Company, which satisfies the regulation of NAMAS at the National Physical
Laboratory, I can offer portable humidity standards which create known humidities at various points from 0% to 100% and which by reason of calibration through NAMAS can be accepted as traced humidity standards.
The standard Humitrace units can be applied to any number of humidity sensors and the values achieved would be used as a fixed point on the RH scale for instrument adjustment or recording.
Claims (3)
1) Humitrace Calibrated Humidity, a multi-walled portable humidity standard with
universal fittings to accommodate majority of RH sensor types.
2) Humitrace Calibrated Humidity, produces a wide range of humidities generated
between the points of 0% and 100$ RH.
3) Humitrace Calibrated Humidity is traced to the UK. Humidity standard at the
National Physical Laboratory through NAMAS.
CLAIM 1
A multi walled apparatus containing a saturated salt
solution separated by a porous wall arranged to
produce an enclosed volume of a certain humidity,
characterised by being traceable to the United
Kingdom National standard.
CLAIM 2
As for claim 1 with traceable calibration through the
NAMAS system.
CLAIM 3
As for claim 1 or 2 wherein the apparatus is
portable.
CLAIM 4
Apparatus according to claim 1 or claim 2 or claim 3
wherein the apparatus is fitted with an adaptor to
accomadate the majority of Relative Humidity sensor
types.
CLAIM 5
Apparatus according to any of the above claims
wherein the humidity generated by the saturated salt
solution is in the range of O to 100 per cent
relative humiditiy.
CLAIM 6
A multi walled apparatus containing a saturated salt
solution separated by a porous wall arranged to
produce an enclosed volume of certain humidity
characterised by being traceably calibrated to a
national standard.
CLAIM 7
Apparatus according to claim 6 with the features
described in claim 3 or claim 4 or claim 5.
CLAIM 8
Any apparatus for traceable humidity calibration as
described herein with reference to the accompanying
drawings.
CLAIM 9
That the two chamber device as described and
illustrated be used for the generation of gasses
other than humidity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9105822A GB2255190B (en) | 1991-03-19 | 1991-03-19 | Calibrated humidity generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9105822A GB2255190B (en) | 1991-03-19 | 1991-03-19 | Calibrated humidity generator |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9105822D0 GB9105822D0 (en) | 1991-05-01 |
| GB2255190A true GB2255190A (en) | 1992-10-28 |
| GB2255190B GB2255190B (en) | 1994-10-05 |
Family
ID=10691836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9105822A Expired - Fee Related GB2255190B (en) | 1991-03-19 | 1991-03-19 | Calibrated humidity generator |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2255190B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009005452A1 (en) * | 2007-07-04 | 2009-01-08 | Q-Sense Ab | Quartz crystal microbalance membrane |
| WO2011079367A1 (en) | 2010-01-04 | 2011-07-07 | Embrapa-Empresa Brasileira De Pesquisa Agropecuária Embrapa Ed. Sede-Pqeb | Dihedral sensor for determining tension, potential and activity of liquids |
| GB2487186A (en) * | 2011-01-05 | 2012-07-18 | Relequa Analytical Systems Ltd | Equilibrium relative humidity testing system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115684475B (en) * | 2022-09-28 | 2025-07-18 | 北京世纪建通科技股份有限公司 | Hand-held type relative humidity calibrator based on saturated salt solution |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1142036A (en) * | 1966-09-08 | 1969-02-05 | Peter John Mackay | Improvements in or relating to hair hygrometers |
| DE2247505A1 (en) * | 1971-10-26 | 1973-05-03 | Luft U Kaeltetechnik Veb K | Humidity standardisers - esp for calibrating humidity sensors,surrounded by temp controlled medium |
| DE2439926A1 (en) * | 1973-08-20 | 1975-03-20 | Gridnew | Test equipment for a hygrometer dynamic behaviour - has a working chamber with a ventilator driving air along it |
-
1991
- 1991-03-19 GB GB9105822A patent/GB2255190B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1142036A (en) * | 1966-09-08 | 1969-02-05 | Peter John Mackay | Improvements in or relating to hair hygrometers |
| DE2247505A1 (en) * | 1971-10-26 | 1973-05-03 | Luft U Kaeltetechnik Veb K | Humidity standardisers - esp for calibrating humidity sensors,surrounded by temp controlled medium |
| DE2439926A1 (en) * | 1973-08-20 | 1975-03-20 | Gridnew | Test equipment for a hygrometer dynamic behaviour - has a working chamber with a ventilator driving air along it |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009005452A1 (en) * | 2007-07-04 | 2009-01-08 | Q-Sense Ab | Quartz crystal microbalance membrane |
| WO2011079367A1 (en) | 2010-01-04 | 2011-07-07 | Embrapa-Empresa Brasileira De Pesquisa Agropecuária Embrapa Ed. Sede-Pqeb | Dihedral sensor for determining tension, potential and activity of liquids |
| US9588030B2 (en) | 2010-01-04 | 2017-03-07 | Embrapa-Empresa Brasileira De Pesquisa Agropecuaria | Dihedral sensor for evaluating tension, potential and activity of liquids |
| GB2487186A (en) * | 2011-01-05 | 2012-07-18 | Relequa Analytical Systems Ltd | Equilibrium relative humidity testing system |
| GB2487186B (en) * | 2011-01-05 | 2015-01-21 | Relequa Analytical Systems Ltd | Equilibrium relative humidity testing system |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9105822D0 (en) | 1991-05-01 |
| GB2255190B (en) | 1994-10-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20050319 |