HMD70U/Y
HMD70U/Y-U162en-1.4
Operating Manual
1996-08-21
3
10528HM
18941HM
GLANDS
LID
SCREW TERMINAL
SCREWS
MEMBRANE FILTER
part no. 17039HM
SPARE PART SENSOR
HUMICAP180
STAINLESS STEEL SINTERED FILTER
part no. HM46670
TO REMOVE THE SENSOR HEAD:
1. Open the lid
2. Disconnect the screw terminal
3. Open the screws (2 pcs)
4. Pull out carefully
TO REINSTALL THE SENSOR HEAD
1. Push in the sensor head
2. Fasten the screws
3. Connect the screw terminal
4. Close the lid
Figure 6: Electronics (can be disconnected), accessories and spare parts
ONE-POINT RH CALIBRATION
The accuracy is recommended to be
checked at least once a year; the interval
depends on the operating conditions and
the required accuracy of the
measurement. When checking the
transmitter calibration, use the HMI41
indicator provided with an appropriate
probe and optional calibration cable. If
adjustment is necessary, use the humidity
offset potentiometer. If you prefer to
calibrate the HMD70U/Y transmitters
against saturated salt solutions, use LiCl
(11 %RH) and NaCl (75 %RH) solutions.
REPLACEMENT OF THE HUMICAP
SENSOR AND THE FILTER
Remove the damaged sensor and insert a
new one. Recalibrate the transmitter.
Replace a dirty filter (membrane or
sintered) to ensure a maximum lifetime
and a fast response time for the sensor.
Do not attempt to clean the filter.
