Vaisala HMP155 - Manual (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
d
) TD ºC ºF
Mixing ratio (x) X g/kg gr/lb.
Wetbulb temperature (T
w
) 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.