Vaisala HMP155 - Manual (Page 54)

USER'S GUIDE____________________________________________________________________
52 _______________________________________________________________ M210912EN-C
Changing the Sensor
You can change the HUMICAP
®
sensor yourself and the probe does not
have to be sent in for service for a sensor change.
NOTE Both HUMICAP
®
180 and HUMICAP
®
180R sensors can be changed,
but you must never replace a HUMICAP
®
180 sensor with a
HUMICAP
®
180R sensor or vice versa.
To change the sensor:
1. Remove the filter from the probe. See the instructions in section
Changing the Probe Filter on page 51.
2. After removing the filter, check the O-ring and change it if
necessary. See Figure 12 on page 53.
3. Remove the damaged sensor and insert a new one. Handle the new
sensor by the plastic socket. DO NOT TOUCH THE SENSOR
PLATE.
4. After sensor change the humidity calibration must be done
according to the instructions, see section Relative Humidity
Adjustment after Sensor Change on page 65.
5. Attach a new filter on the probe.
CAUTION In HUMICAP
®
180C/180RC models, the temperature sensor is integrated
with the relative humidity sensor. It is recommended that these type of
sensors are changed by Vaisala Service. See section Product Returns on
page 55.
If you do change the sensor yourself, the instructions above apply, except
now before removing the damaged sensor, you need to unsolder the
connections from the temperature sensor pins. Likewise the new
temperature sensor connections need to be soldered to the temperature
sensor pins. Be careful when soldering the sensor pins.