Vaisala HMP110 - Manual (Page 62)

User's Guide ______________________________________________________________________
60 __________________________________________________________________ M211060EN-E
Changing the HUMICAP® 180R Sensor
(HMP110 and HMP113)
NOTE Replacing the humidity sensor of the HMP110 is not necessary in
normal operation. If the accuracy of the probe does not seem to be
within specification, it is likely that the accuracy can be restored by
performing the adjustment procedure. See section Two-Point
Adjustment of RH Measurement (HMP110 and HMP113) on page 56.
Follow this procedure to replace the humidity sensor of the HMP110 in
case it has been damaged, or normal adjustment is not sufficient to
restore the measurement accuracy. Calibration and adjustment of the
humidity measurement is required after the sensor change.
To perform this procedure, you need a new HUMICAP® 180R sensor. It
is also recommended that you replace the filter with a new one. For
order codes, see section Options and Accessories on page 68.
1. Remove the filter from the probe by turning it counter-clockwise.
2. There are two sensors under the filter, the HUMICAP® sensor and
a temperature sensor. Identify the HUMICAP® sensor – do not
touch the temperature sensor.
1210-035
Figure 26 HUMICAP® 180R Sensor
3. Pull out the old HUMICAP® 180R sensor and insert a new one.
Refer to Figure 25 on page 59. Handle the new sensor by the plastic
frame. DO NOT TOUCH THE SENSOR PLATE.
4. Perform a two-point adjustment of the RH measurement as
instructed in section Two-Point Adjustment of RH Measurement
(HMP110 and HMP113) on page 56.
5. Attach a new filter on the probe.