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

Speed
Measurement range
Accuracy
     0 ... 35 m/s
     36 ... 60 m/s

Direction
Measurement range
Accuracy
Response time


0 ... 60 m/s

±0.3 m/s or ±3%, whichever is greater
±5%


0 ... 360°
±3°
250 ms

Liquid precipitation

Rainfall
    
     output resolution
     accuracy

Rainfall duration
    
    
output resolution

Rain intensity
     range
     output resolution

cumulative accumulation after latest automatic or manual reset
0.01 mm, 0.001 inches
5%*

counting each ten-second increment when droplet detected
10 s

one-minute running average in ten-second steps
0 … 200 mm/h (broader range with reduced accuracy)
0.1 mm/h, 0.01 inches/h

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

General

Operating temperature
Storage temperature
Input voltage
Typical power consumption
Heating voltage
Serial data interface
Housing
Housing with mounting kit
Electromagnetic compatibility
IEC standards

-52 ... +60 °C (-60 ... +140 °F)
-60 ... +70 °C (-76 ... +158 °F)
5 … 32 VDC
3 mA at 12 VDC (with defaults)
5 … 32 VDC (or AC, max. 30 VRMS)
SDI-12, RS232, RS485, RS422, USB adapterr
IP65
IP66
complies with EMC standard EN61326-1; Industrial Environment
IEC 60945/61000-4-2 … 61000-4-6

*

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".

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.



This page was printed from www.vaisala.com on Oct 7, 2008
URL: http://www.vaisala.com/weather/products/weatherinstruments/weathermulti-sensor/vaisala%20humicap%c2%ae%20capacitive%20thin-film%20humidity%20sensor.html