Vaisala DRYCAP® Technology

As the leading developer and provider of humidity measurement instruments, Vaisala knows also the very dry measurement conditions.

Reliable data needed

The demand for reliable moisture measurement instruments grew in the 90s, and it was noticed that the traditional humidity probes were not accurate enough at very low humidity levels. The commonly used aluminum oxide sensors were prone to drift and required frequent calibration. A new type of a moisture sensor was needed.

Taking every measure for the planet

We took on the challenge by combining the highest quality polymer technology with a patented key feature – auto-calibration – that would eliminate sensor drift in very dry conditions.

The era of DRYCAP® begins 

In 1997, we introduced a new type of dew point sensor based on thin-film polymer technology, the DRYCAP® sensor, that could be used in various Vaisala probes for dry measurement conditions.

The parameter of high demand 

Since its launch, the DRYCAP product family has grown to encompass a huge range of applications, from drying processes to compressed air and dry chambers. The DRYCAP sensor is particularly renowned for its reliable performance in hot and very dry environments and this highly successful innovation is continuously growing its demand.

When process measurement truly matters

An example of the several demanding industrial applications where Vaisala DRYCAP technology is used today is battery manufacturing. Due to the ultra-low humidity requirement and highly controlled atmospheric conditions, reliable dew point measurement is a must. The accurate and stable data the instruments provide, enable controlling the moisture levels along any critical locations of the process, such as the electrode production. 

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How Vaisala DRYCAP works

DRYCAP’s unrivalled performance is based on two innovations: the proven capacitive thin-film polymer sensor and the auto-calibration function. The sensor’s thin-film polymer absorbs or releases water vapor as the surrounding humidity increases or decreases. The dielectric properties of the polymer change as the humidity around the sensor changes, as does the capacitance of the sensor. Capacitance is converted into a humidity reading. The capacitive polymer sensor is bonded together with a temperature sensor, and dew point is calculated from the humidity and temperature readings.

Auto-calibration

Vaisala’s patented auto-calibration function optimizes the measurement stability in dry environments. The sensor is heated at regular intervals during the automated auto-calibration procedure. The humidity and temperature readings are monitored as the sensor cools to ambient temperature, with offset correction compensating for any potential drift. This enables the DRYCAP sensor to deliver accurate measurements in the long term, dramatically reducing the need for maintenance.

Sensor purge

Sensor purge is also an automatic procedure that minimizes the drift at the wet end readings of the dew point measurement. Sensor purge is performed regularly and when the power is switched on. The sensor is heated for several minutes, which will then evaporate all excess molecules out of the sensor polymer. This, together with the auto-calibration, results in a very small drift. The measurement output of the transmitter is frozen to the last measured value for the duration of the sensor purge.

Key benefits and features of Vaisala DRYCAP technology

High chemical tolerance

Immune to contamination by compressor oils and volatile organics

Withstands saturation

Tolerates condensing environments and getting wet

Fast response time

From dry to wet 5 seconds (15 s) & from wet to dry 45 seconds (8 min)

Sensor purge and warming

Improved measurement accuracy and less frequent calibration needs

Excellent accuracy and stability

Reliable measurement with very small hysteresis

Vaisala quality

DRYCAP is constantly developed by our scientists and manufactured in our high-quality cleanrooms

DRYCAP® application examples

Below you can see some applications, where the DRYCAP technology and our related dew point measurement instruments play a key role among other measurement parameters. Instruments with Vaisala DRYCAP sensors are often used is conditions under 10%RH (relative humidity), where as our HUMICAP technology covers ambient and high-humidity measurement conditions. Please contact our sales engineers if you have questions or concerns about your measurement instrument needs.

DRYCAP® 技術を使用した製品

DM70 Hand-Held Dewpoint Meter

DM70 ハンディタイプ露点計

スポットチェック用のDM70 ハンディタイプ露点計は、圧縮空気、金属加工処理、積層造形、食品やプラスチック乾燥工程などの産業分野において、正確かつ迅速な露点計測を実現します。
DMT340 Series Dewpoint and Temperature Transmitters

DMT340シリーズ 露点変換器

DMT340シリーズは生産終了となります。 耐結露性の高いDMT340は工業用乾燥工程、圧縮空気システム、半導体産業、ドライルーム、調理用オーブン、金属処理など産業用の低露点環境における計測に適した設計です。
DMT345 and DMT346 Dewpoint Transmitters

DMT345/DMT346 露点変換器

DMT340シリーズは生産終了となります。 ヴァイサラ DRYCAP® 露点変換器 DMT345/DMT346 は、特に高温環境における産業用乾燥機器の露点計測に適したモデルとして設計されています。
DMT152 Dewpoint Transmitter for Low Dew Point Measurement in OEM Applications

DMT152 露点変換器

-80°Cまでの計測に対応する低露点計測用として設計されているDMT152は、半導体業界をはじめ、純ガス、ドライヤー、グローブボックス、乾燥チャンバー、積層造形などの産業用途や、微量の水分管理が必要とされる用途に最適です。

Quick dew point calculations and conversions with Vaisala Humidity Calculator

Calculations related to dew point and frost point temperature can sometimes be tricky. Vaisala Humidity Calculator app is your daily help with several types of humidity and moisture related calculations and unit conversions. You can use it in a browser or download it to your phone.

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Dew point or frost point temperature?

Dew point temperature is used to describe the temperature at which moisture in the air will begin to condense as dew. Frost point temperature describes the temperature at which moisture in the air will begin to condense as frost or ice. 

See our recommendations regarding dew point and frost point temperature measurement outputs in low humidity applications.

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