Portable Hygrometers

Rugged portable hygrometers designed for daily use in demanding environments

Natural Gas

Compressed Air

Medical Gases

HV Switchgear

Power Generation

 More...

Michell Instruments range of portable hygrometers allow fast, accurate and stable measurements of dew point, relative humidity and moisture concentration. Each hygrometer is designed for daily use in the most demanding of industrial environments, while maintaining excellent performance and simplicity of operation.

All of our portable instruments are supplied with calibrations traceable to National Standards, or alternatively can be calibrated in our UKAS Accredited calibration lab in accordance with the ISO17025 standard.


PST logo
PLEASE NOTE:
We are part of Process Sensing Technologies and all our products now live on our new website, ProcessSensing.com. The links below take you to the new product pages - don't forget to update your bookmarks and favorites!

Dew Point and Relative Humidity Portables

MDM300 Sampling Options
MDM300 Sampling Options
To get the best possible performance from your MDM300 or MDM300 I.S., it is crucial to have appropriate sample conditioning for your measurement point. Options are available to coverall common sampling requirements – from verification of dry compressed air supplies, to the measurement of natural gas downstream of a glycol contactor.
MDM300 - High-speed dew-point hygrometer
MDM300 - High-speed dew-point hygrometer
Easy to use, ergonomic, portable dew-point hygrometer offering rapid spot-check measurements of dew point or moisture content. Available with optional ATEX, IECEx, FM, CSA, INMETRO and TC TR Ex certification.

This link takes you to ProcessSensing.com - the new home for Michell Instruments' products

MDM25 - Hand-Held Hygrometer
MDM25 - Hand-Held Hygrometer
Portable, battery-operated hygrometer, available with a number of probe configurations. Displays relative humidity, temperature and one calculated value, making it suitable for a wide range of applications.
Easidew Portable - Compact and Easy to Use Dew Point Hygrometer
Easidew Portable - Compact and Easy to Use Dew Point Hygrometer
Designed to make spot checks of the dew point in air and gases as simple as possible. Simply connect your sample gas, turn on the instrument and it will automatically begin to measure the dew point of the applied sample.

This link takes you to ProcessSensing.com - the new home for Michell Instruments' products

MDM50 - Portable Hygrometer
MDM50 - Portable Hygrometer
Designed to make high-speed spot check measurements to -60°C dew point as simple as possible, simply connect your sample gas, turn on the instrument and it will automatically begin to measure the dew point of the applied sample.

This link takes you to ProcessSensing.com - the new home for Michell Instruments' products

Related Products

Accurate and reliable dew point and moisture content measurement of natural gas is important for:


  • Avoiding hydrate formation in pipelines or valves
  • Preventing corrosion of pipes, fittings and equipment
  • Verifying the performance of glycol contactors

Compressed air drying systems are usually regulated and measured at their source, however when the air is distributed around a large site, the quality can deteriorate due to moisture ingress through tubing and fittings.

When the air is being used for critical applications, it is very important to verify that the air is suitably dry to avoid damage to the equipment or processes it is being supplied to. Using a portable hygrometer to sample the air at the point of use is the best way to confirm its suitability.

High levels of water vapour in medical or breathing gases make them uncomfortable to breath and promote the growth of unwanted bacteria.

Pharmacological regulations state that the gases should periodically be tested to ensure that their dew point is sufficiently low.

Monitoring the quantity of moisture within the SF6 quench gas of switchgear is vital to avoid an increase in conductivity, which leads to arcing. It is also necessary to prevent corrosion of contacts, which happens when they are exposed to water for an extended period of time.

Hydrogen is used to cool generator windings in power plants. A heat exchanger then cools the hydrogen with water.

Water will ingress into the generator casing over time, increasing the risk that condensation could occur on live windings.

By regularly measuring the dew point of the hydrogen, you can guarantee that the dew point will never rise above the temperature.

The applications for portable hygrometers are not limited to whats listed on this page.


We have over 40 years experience measuring humidity & performing calibrations and can help you choose the best product for your application.