Vaisala INTERCAP HMDW80 SERIES Dokumentacja Pobierz pdf (Strona 82)

/ TECHNOLOGY DESCRIPTION

Vaisala DRYCAP® Sensor for Measuring

Dew Point

DRYCAP in Brief

▪

Thin-film polymer sensor with

unique auto-calibration function

▪

Wide measurement range, dew

point measurement down to

-80 °C (-112 °F)

▪

Accuracy ± 2 °C (± 3.6 °F)

▪

NIST-traceable dew point

measurement

DRYCAP’s Unique Benefits

▪

Excellent long-term stability,

with recommended 2-year

calibration interval

▪

Rapid response time

▪

Withstands condensation and

recovers rapidly

▪

Resistant to particulate

contamination, oil vapor, and

most chemicals

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 at low dew points.

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.

It is also controlled in compressed

air, where excess moisture can result

in poor end-product quality, ice

formation, and equipment corrosion.

Dew Point

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