Vaisala DRYCAP® Technology

Vaisala Drycap Wafer in hand

In 1997 Vaisala introduced DRYCAP®, a new type of dew point sensor based on thin-film polymer technology. 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.

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.

Vaisala´s Drycap Technology description

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.

Compressed air tube
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

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 in-line humidity measurement in industrial drying applications with high...
Probe head and probe body of the DMP6 for very high temperatures

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 in-line humidity measurement in industrial drying applications with very high...
DMP7 probe head and body

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 applications. Its short probe length makes it suitable...
DMP8 probe head and body

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 industrial low-humidity applications with pressure up to 40 bars. Typical...
DM70 Hand-Held Dewpoint Meter

Handheld Dewpoint Meter DM70

for Spot-Checking Applications
Handheld Dewpoint Meter DM70 for spot-checking applications and field calibration offers accurate and fast measurement for industrial dew point...
DMT132 Dewpoint Transmitter for Refrigerant Dryers

Dew Point Meter DMT132

for Refrigerant Dryers
Vaisala HUMICAP® Dewpoint Transmitter DMT132 is an affordable dew point measurement instrument designed to verify the functionality of refrigerant...
DMT152 Dewpoint Transmitter for Low Dew Point Measurement in OEM Applications

Dew Point Transmitter DMT152

Dew point measurement in very dry environments
Designed to reliably measure low dew point - even down to below -80°C - the DMT152 is an ideal choice for the semiconductor industry as well as...