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Vaisala HUMICAP® Sensor

Vaisala's products measuring relative humidity incorporate the advanced capacitive thin-film humidity sensor Vaisala HUMICAP®. The sensor is designed for demanding humidity measurement applications where high accuracy is important. The repeatability, stability and performance of the Vaisala HUMICAP® Sensor have been proved in many industrial control processes where conditions can be very harsh.

The operating principle

The thin polymer film either absorbs or releases water vapor as the relative humidity of the ambient air rises or drops. The dielectric properties of the polymer film depend on the amount of water contained in it: as the relative humidity changes the dielectric properties of the film change and so the capacitance of the sensor changes. The electronics of the instrument measure the capacitance of the sensor and convert it into a humidity reading.

 

Wind speed

Measurement range
Accuracy

0 ... 60 m/s
±0.3 m/s or ±3%, whichever is greater (0 ... 35 m/s)
±5% (36 ... 60 m/s)

Wind direction

Measurement range
Accuracy

0 ... 360°
±3°

Liquid precipitation

Rainfall

Accuracy
Rain duration

Rain intensity

cumulative accumulation after latest automatic or manual reset
5%*
counting each ten second increment when droplet detected
one minute running average in ten second steps

Barometric pressure

Measurement range
Accuracy

600 ... 1100 hPa
±0.5 hPa at 0 ... 30 °C (+32 ... +86 °F)
±1 hPa at -52 ... +60 °C (-60 ... +140 °F)

Air temperature

Measurement range
Accuracy at +20 °C (+68 °F)

-52 ... +60 °C (-60 ... +140 °F)
±0.3 °C (±0.5 °F)

Relative humidity

Measurement range
Accuracy

0 ... 100 %RH
±3 %RH within 0 ... 90 %RH
±5 %RH within 90 ... 100 %RH

*

Due to the nature of the phenomenon, deviations caused by spatial variations may exist in precipitation readings, especially in short time scale. The accuracy specification does not include possible wind induced error.

For complete specifications, please see the datasheet or user guide in "Product Documentation".

Brochures

Order Forms

User Guides

Wiring Diagrams

Vaisala News articles

Typical delivery times

 

  USA

  EUROPE

  JAPAN, CHINA, ASIA

  1 - 2 products

  4 work days *

  3 work days *

  4 work days *

  1 - 5 products

  7 work days

  7 work days

  7 work days

  6 or more products

  21 work days

  21 work days

  21 work days


Note that the products are configured to your needs.

* Urgent delivery fee will be added.

Spare parts

Common spare parts are available. For availability contact sales.

Repair

Repair services are available at Vaisala service centers for a fixed price.

Repair price includes:
-repair work
-required parts
-service report

Technical support

Technical support for your installed units, contact helpdesk@vaisala.com.

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Related documents

Vaisala RAINCAP® Sensor Technology (PDF 110 KB)

Vaisala BAROCAP® Sensor brochure (PDF 119 KB)

HUMICAP® Capacitive Thin-film Humidity Sensor

This page was printed from www.vaisala.com on May 13, 2008
URL: http://www.vaisala.com/instruments/products/weathermulti-sensor/vaisala%20humicap%c2%ae%20capacitive%20thin-film%20humidity%20sensor.html