Compressed air is a vital component of many industrial processes. It affects the quality of both the process and the end product. What’s more, compressed air often comprises the largest use of electricity in a plant. Since the importance of clean, dry compressed air – and the cost associated with it – is so high, carefully managing and monitoring of it becomes a crucial task for any plant. One of the most important parameters associated with the quality of compressed air is dew point. Read this blog post for information on dew point. By using stable dew point measurement you can avoid over-drying, save energy and protect the equipment from corrosion.


When dealing with compressed air, measuring small changes in dew point temperature can really make a difference. The benefit from our unique DRYCAP® sensor technology covers the full dew point range for practically any compressed air system.

Increasing the life of your compressed air system, improving process quality and lowering costs is now easier than ever. Download our latest product brochure to see the overview of all Vaisala's dew point measurement products to ensure high-quality compressed air.

Facts and Figures

  • Stable instruments
  • Fastest wet-to-to dry response time on the market
    Vaisala dew point transmitters incorporate the DRYCAP® sensor for which it takes just minutes to reach an accurate reading after a step change from ambient humidity to a -40°C dew point. 
  • High resistance to contamination
    DRYCAP® sensor is immune to compressor oil and most other chemical contaminants. 
  • Long 2-year calibration interval
    Stable polymer material, advanced auto-calibration and purge features keep the sensor stable for a record time.
  • Easy calibration services
  • Wide variety of instruments
    Lightweight hand-held instruments, configurable &  customized fixed mount transmitters, OEM models and as a market first, a model which combines dew point and pressure measurement.
  • With accurate dew point measurement you can reduce energy consumption by up to 20%.

Watch the video

How to spot-check your compressed air system?

How to spot-check your compressed air system?

Product Manager Joni Partanen from Vaisala shows how easy it is to spot-check an industrial compressed air system. He uses Vaisala Handheld Dewpoint Meter DM70 where he stores several days of data and uploads it to a PC with free MI70 Link Windows software for further analysis. Also the installation of the dew point meter and a sampling system is shown step by step.

The DM70 comes with stable Vaisala DRYCAP sensor technology, but to ensure that it meets regulatory compliance year after year, we recommend Calibration Care agreement for your accredited or standard calibrations. That will help you freeze your calibration costs for up to 4 years. Also several other benefits are included, such as free shipping, planned calibrations, and access to Vaisala MyLearning.

Firefighters with Oxygen Tanks

Breathing Air Measurement

Bottled/compressed air is used as breathing gas in a number of critical applications such as medical & hospital air and self contained breathing apparatus for rescue personnel.  Dew point monitoring is required for compliance with most medical gas and breathing air regulations. Stringent control guarantees safe breathing conditions for hospital patients and firefighters.

Vaisala offers various dew point transmitters ideal for monitoring breathing air with dew points down to  -80°C and pressures up to 50 bar.

Plastic Molding

Plastics Drying

Dryer performance is critical when moisture sensitive materials, such as PET resin and nylon, are dried prior to molding. Dew point measurement can be used to monitor a dryer’s performance or conditions in the hopper, assuring that the drying process remains within specification. 

Vaisala has a range of stable and reliable dew point transmitters both for OEM configurations as well as for end users.

For those who prefer a direct measurement of humidity or dew point temperature within the hopper, which can correlate to moisture content of the material in the hopper, Vaisala offers a portable sampling system DSS70A to be used with a hand-held meter DM70.

Compressed air related products

Indigo520 with probe

Indigo500 Series Transmitters

The Vaisala Indigo500 series transmitters are host devices for Vaisala Indigo-compatible, stand-alone smart probes. The Indigo500 series include multi-functional Indigo520 transmitter and Indigo510 transmitter with basic features.


Indigo300 transmitter

Vaisala Indigo300 transmitters are host devices for Vaisala Indigo-compatible, stand-alone smart probes.

DMT132 Dewpoint Transmitter for Refrigerant Dryers

Dew Point Meter DMT132

Vaisala HUMICAP® Dewpoint Transmitter DMT132 is an affordable dew point measurement instrument designed to verify the functionality of refrigerant dryers.

DMT152 Dewpoint Transmitter for Low Dew Point Measurement in OEM Applications

Dew Point Transmitter DMT152

The Vaisala DRYCAP® Dewpoint Transmitter DMT152 is designed for measuring low dew point in OEM applications, even down to -80°C.

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