Image credit: Buck Research Instruments | Honeywell | GE Measurement and Control   Hygrometers and humidity measurement instruments test for absolute humidity, relative humidity, or dew point in air. The range humidity measurement instruments operate in is typically from 0 to 100% humidity. They are sometimes combined with other sensing devices such as temperature sensors.   Measurement Capabilities
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Q & A on Hygrometers and Humidity Measurement Instruments

We asked our users for their input on Hygrometers and Humidity Measurement Instruments. Here are the results of 172 users familiar with Hygrometers and Humidity Measurement Instruments.

Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice |

Who Took Our Poll?Top

Design TrendsTop

Q:
What new technologies are influencing humidity measurement instrument design?
18 answers
Answers:
Stringent new building codes & directives to improve the airtightness of buildings are increasing the use of humidity measurement to diagnose and monitor the condition of buildings and their HVAC systems.
~Dave B, Engineer, Newcastle Upon Tyne, UK
*Only in the low temp region, what about cryogenic/high temp regions? *Big display units to monitor controlled humidity and temperature with a USB memory stick data download point.
~Hermann B, Nuclear Technologist, Pretoria, South Africa
Unknown. I use chilled mirror sensors as the most accurate dew point measurement commercially available.
~Engineering, Design, Ottawa, Canada
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Q:
From your perspective, which companies are creating the most innovative humidity measurement instruments?
27 answers
Answers:
I am not at the present aware of the many different companies. We are using Veris industries sensors.
~Jim D, Faculty/Staff, Cedar Rapids, IA
We use the TDR devices developed by the Institute of Agrophysic of Polish Academy of Sciences in Lublin.
~Research & Development, Lviv, Ukraine
MicroLog, easy software, easy to use and has an extra probe, displays both temperature and humidity.
~Hermann B, Nuclear Technologist, Pretoria, South Africa
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Applications and UseTop

Q:
What are some of the applications you have used humidity measurement instruments for?
52 answers
Answers:
Moisture in magnetite pellets before sintering - not found suitable technique to measure this on a moving conveying belt (infra red detectors). Moisture in wood - not solved to find a suitable microwave/dielectric technique to measure during sawing operation in a sawmill. Now I want to study the solar radiation influence on RH-sensors in screens for weather measurements and also aging with salty air.
~Engineering, Faculty/Staff/Student, Borås, Sweden
Control of powder stickiness in spray drying and fluid bed drying applications. This requires ambient humidity measurement coupled with heat and mass balance calculations to estimate humidity in parts of the process where direct measurement is impractical.
~Chris B, Engineering Consultant, Dunedin, New Zealand
For creation of the automated system of soil ecosystems monitoring with aim of estimation of influence of climate changes in the region of West Polesie of Ukraine.
~Research & Development, Lviv, Ukraine
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Q:
Please share with us any “non-standard” applications that humidity measurement instruments have been used for.
10 answers
Answers:
Long term ambient loggers to be used in rooms where we keep our standards (radio-active), some standards' chemical properties might change with temperature and humidity fluctuations.
~Hermann B, Nuclear Technologist, Pretoria, South Africa
Boiler Combustion room atmosphere where a drying substance has been placed for conservation purposes ( approx 20 M3 volume).
~Technical Support/Services, OUed Ksob, Algeria
Detection of steam leaks in a 40 bar g steam radiator supplying 220 deg C hot air to a spray drier.
~Chris B, Engineering Consultant, Dunedin, New Zealand
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Q:
Do you know of any disastrous mistakes that occurred due to the incorrect usage of humidity measurement instruments?
9 answers
Answers:
Yes, most people do not allow time for the instrument and sensor to stable so they get very erroneous readings which causes a multitude of problems.
~Andy B, Project Manager, Preston, UK
No, but working with explosive casting and powders before it goes into a shell will be very important to know at what humidity it took place.
~Hermann B, Nuclear Technologist, Pretoria, South Africa
Too low or too high flow rate leak, the sensor is designed to measure in air, but used in other gases.
~David T, University researcher, Szeged, Hungary
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FeaturesTop

Q:
What would your design or feature "wish list" be for this product?
24 answers
Answers:
Simplification of selection possibly through a web-based guide. The combinations of options available make selection difficult. When an order is placed, the options are often incompatible, requiring much back and forth communication with the vendor.
~Chris B, Engineering Consultant, Dunedin, New Zealand
To measure high temperatures e.g: >600 deg Celsius and low temperatures e.g -196 deg Celsius (liquid nitrogen); to measure surface temperatures and very small probes to measure temperature on components etc.
~Hermann B, Nuclear Technologist, Pretoria, South Africa
On the data loggers it would be great if they had a wireless feature so the data monitoring could be accessed in real time while off-site.
~Dave B, Engineer, Newcastle Upon Tyne, UK
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Buying AdviceTop

Q:
Do you have any advice for people relative to buying or using humidity measurement instruments?
18 answers
Answers:
Test it before actually start using it. Newer and newer technologies appear, but many of them are actually unusable. So be careful with the "super" instruments. Most of humidity sensors are designed to measure in air, and in other gases like natural gas, hydrogen... they probably measure something fool.
~David T, University researcher, Szeged, Hungary
Verify that 100% RH humidity measurement can actually be achieved with dew point sensor, as special heating provisions are required. Be aware of accuracy tradeoffs for chilled mirror versus capacitive humidity sensors.
~Engineering, Design, Ottawa, Canada
Buy the best possible quality you can afford as the cheaper instruments are unreliable and not very accurate; the best instrument is a chilled mirror hygrometer but these are invariably too expensive to purchase.
~Andy B, Project Manager, Preston, UK
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Q:
Is there any advice you want to share with users to help them avoid common errors in selection or usage of humidity measurement instruments?
14 answers
Answers:
The instrument needs to be in a slow air flow for best results, it is very difficult to measure humidity in fast flowing air. Allow the instrument time to stabilize at the temperature level before taking any readings.
~Andy B, Project Manager, Preston, UK
Do not boil water on a hot plate in the lab and think that your humidity is correct. Use your fume hood to get rid of any condensed steam.
~Hermann B, Nuclear Technologist, Pretoria, South Africa
Always do a sensitivity analysis on the effect the claimed accuracy will have on the process you are controlling or monitoring.
~Chris B, Engineering Consultant, Dunedin, New Zealand
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