Vaisala HMP155 User Manual download pdf (Page 14)

USER'S GUIDE____________________________________________________________________

12 _______________________________________________________________ M210912EN-C

Table 4 Quantities Calculated by HMP155

Quantity Abbreviation Metric

Unit

Non-Metric

Unit

Dew point / Frost point

Temperature (T

d/f

)

TDF ºC ºF

Dew point Temperature (T

) TD ºC ºF

Mixing ratio (x) X g/kg gr/lb.

Wetbulb temperature (T

) TW ºC ºF

Basic Features and Options

- Can be used to replace HMP45A/D, also in radiation shields

- Improved performance with the HUMICAP

180R sensor and

alternatively the HUMICAP

180RC sensor. Also available with the

HUMICAP

180 sensor.

- Warmed humidity probe for improved performance in constant high

humidity (active output version).

- Different voltage ranges possible: 0...1 V, 0…5 V, 0…10 V (active

and passive output versions).

- Different T-output scales possible: -40…+60°C, -20…+40°C,

-80…+60°C (active output version)

- Chemical purge option for applications where interfering chemicals in

the measuring environment pose a risk (active output version).

- Additional temperature probe (T-probe) with fast response (active

output version).

- USB connectivity for service connections via the optional USB-M12

cable.

- Installation kits for an additional T-probe into DTR13 and DTR502

radiation shields.

- Installation kit for Stevenson screen (active and passive output

version, both with and without additional T-probe).

- MI70 connectivity for field checking and calibration.

- Optional connection cover for additional protection in wet

environments.

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