Vaisala DRYCAP® Technology The DRYCAP story began in the mid-1990s following an unresolved measurement challenge. Traditional humidity instruments were not accurate enough at very low humidities, while commonly used aluminum oxide sensors were prone to drift and required frequent calibration. There was a strong demand for accurate, easy-to-use, cost-effective, and low-maintenance dew point instruments. Vaisala's solution was to combine the highest quality polymer technology with a patented key feature – auto-calibration – that would eliminate sensor drift in very dry conditions. In 1997, Vaisala introduced a a new type of dew point sensor based on thin-film polymer technology, the DRYCAP® sensor. 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 still going strong today. How it 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. 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. Typical applications for dew point measurement Vaisala DRYCAP dew point instruments measure dew point in industrial applications, where gas humidity is typically very low. Dew point is often a critical parameter, with inadequate control resulting in problems such as process downtime, damaged process equipment, and deterioration in end-product quality. Dew point is measured in various drying and heat-treatment processes, such as plastic drying, baking ovens, and food drying. It is also controlled in compressed air, where excess moisture can result in poor end-product quality, ice formation, and equipment corrosion. Other typical applications include medical gas, dry environments in lithium battery manufacturing, and gas-insulated high-voltage equipment used in the power industry. Vaisala DRYCAP dew point products Vaisala's dew point instruments are suitable for accurate and stable monitoring of dry conditions in a variety of applications from -80 to +100 °C Td. Vaisala’s product range includes transmitters for demanding industrial applications, compact instruments for installation in dryers, and hand-held meters for spot checking. Portable sampling systems are also available. Download Vaisala Compressed Air e Guide or try our Drying Simulator to calculate your energy and cost savings! It is also controlled in compressed air, where excess moisture can result in poor end-product quality.
Products using DRYCAP® Technology Dew Point and Temperature Probe DMP5 for in-line measurement in high temperature applications <180 °C Vaisala DRYCAP® Dew Point and Temperature Probe DMP5 is designed for... Read more Dew Point Probe DMP6 for in-line measurement in very high temperature applications <350 °C Vaisala DRYCAP® Dew Point and Temperature Probe DMP6 is designed for... Read more Dew Point and Temperature Probe DMP7 for remote installations in tight spaces Vaisala DRYCAP® Dew Point and Temperature Probe DMP7 is made for tight spaces and low-humidity... Read more Dew Point and Temperature Probe DMP8 with adjustable installation depth for pressurized pipelines <40 bars Vaisala DRYCAP® Dew Point and Temperature Probe DMP8 is designed for... Read more Dew Point and Temperature Meter Series DMT340 for demanding low humidity conditions Condensation-resistant DMT340 is designed for industrial low-humidity applications such as industrial drying... Read more Dew Point Transmitters DMT345 and DMT346 for high temperature applications The Vaisala DRYCAP® Dewpoint Transmitters DMT345 and DMT346 are designed for humidity measurement in industrial... Read more Dew Point and Pressure Transmitter DPT146 for compressed air measurement DPT146 for compressed air measurement makes monitoring compressed air simple and convenient. The DPT146 measures both... Read more Multiparameter Transmitter DPT145 for SF6 Gas – Now with extended dew point range Innovative. That’s DPT145. Our uniquely capable Multiparameter Transmitter for SF6 gas opens for... Read more Handheld Dewpoint Meter DM70 for spot-checking applications Handheld Dewpoint Meter DM70 for spot-checking applications and field calibration offers accurate and fast measurement... Read more Miniature Dew Point Transmitters DMT143 & DMT143L (Long) for OEM applications Miniature size dew point transmitters DMT143 and DMT143L are ideal choices when you want to measure dew point accurately in small... Read more Dew Point Meter DMT132 for refrigerant dryers Vaisala HUMICAP® Dewpoint Transmitter DMT132 is an affordable dew point measurement instrument designed to verify the... Read more Dew Point Transmitter DMT152 Dew point measurement in very dry environments The Vaisala DRYCAP® Dewpoint Transmitter DMT152 is designed for measuring low dew point in OEM... Read more
Dew Point and Temperature Probe DMP5 for in-line measurement in high temperature applications <180 °C Vaisala DRYCAP® Dew Point and Temperature Probe DMP5 is designed for... Read more
Dew Point Probe DMP6 for in-line measurement in very high temperature applications <350 °C Vaisala DRYCAP® Dew Point and Temperature Probe DMP6 is designed for... Read more
Dew Point and Temperature Probe DMP7 for remote installations in tight spaces Vaisala DRYCAP® Dew Point and Temperature Probe DMP7 is made for tight spaces and low-humidity... Read more
Dew Point and Temperature Probe DMP8 with adjustable installation depth for pressurized pipelines <40 bars Vaisala DRYCAP® Dew Point and Temperature Probe DMP8 is designed for... Read more
Dew Point and Temperature Meter Series DMT340 for demanding low humidity conditions Condensation-resistant DMT340 is designed for industrial low-humidity applications such as industrial drying... Read more
Dew Point Transmitters DMT345 and DMT346 for high temperature applications The Vaisala DRYCAP® Dewpoint Transmitters DMT345 and DMT346 are designed for humidity measurement in industrial... Read more
Dew Point and Pressure Transmitter DPT146 for compressed air measurement DPT146 for compressed air measurement makes monitoring compressed air simple and convenient. The DPT146 measures both... Read more
Multiparameter Transmitter DPT145 for SF6 Gas – Now with extended dew point range Innovative. That’s DPT145. Our uniquely capable Multiparameter Transmitter for SF6 gas opens for... Read more
Handheld Dewpoint Meter DM70 for spot-checking applications Handheld Dewpoint Meter DM70 for spot-checking applications and field calibration offers accurate and fast measurement... Read more
Miniature Dew Point Transmitters DMT143 & DMT143L (Long) for OEM applications Miniature size dew point transmitters DMT143 and DMT143L are ideal choices when you want to measure dew point accurately in small... Read more
Dew Point Meter DMT132 for refrigerant dryers Vaisala HUMICAP® Dewpoint Transmitter DMT132 is an affordable dew point measurement instrument designed to verify the... Read more
Dew Point Transmitter DMT152 Dew point measurement in very dry environments The Vaisala DRYCAP® Dewpoint Transmitter DMT152 is designed for measuring low dew point in OEM... Read more