Vaisala HMDW110 - Manual (Page 54)

3. Remove the filter to access the sensors.
1 = Vaisala HUMICAP
®
sensor. Handle by the
plastic frame.
2 = Temperature sensor. Do not touch or
attempt to remove.
3 = Sensor socket.
4 = Transmitter probe.
4. Pull out the old HUMICAP
®
sensor, and insert the new one.
5. Perform a two-point humidity calibration on the serial line using the
FCRH command. See section Two-Point Humidity Calibration and
Adjustment using a computer and a HMK15 Humidity Calibrator on
page 46.
6. Insert the new filter.
7. Duct models only: push the probe back into the duct, to the same depth
where it was before. Tighten the tightening screw on the fastening flange.
8. Power up the transmitter.
Replacing the HUMICAP
®
Sensor on HMS110/112
n New HUMICAP
®
humidity sensor (HUMICAP180R or
HUMICAP180VHP).
n
New filter (always recommended when replacing the sensor).
n
Medium size crosshead screwdriver (Pozidriv).
n
Flat-head screwdriver
n
3 mm hex key (Allen key) for opening the radiation shield
screws.
52
5 Maintenance