ROTRONIC HM4 - Manual (Page 31)

E-M-HM4-V0_08
ROTRONIC AG
Bassersdorf, Switzerland
Document Code Unit
HM4 Humidity and Temperature Probe with
Heated Sensor
Instruction Manual
Document Type
Page 31 of 41
Document Title
© 2014; ROTRONIC AG E-M-HM4-V0_08
8.3 Filter Maintenance
Depending on the application and environmental conditions, the filter must be checked from time to time and
cleaned or replaced when soiled.
1. Unscrew the filter from the probe housing and carefully pull the filter off the probe in a straight line.
2. When placing the filter back on again, take care not to damage or bend the wires of the Pt100 sensor
(Figure 7).
Figure 7: Probe head (filter removed)
8.4 Validation of the Analog Outputs
The HM4 offers the possibility to set the analog outputs on a fixed value. This makes it possible to test if the
output stages of the HM4 are working correctly. The function can be activated with the HW4 PC software. Setting
of fixed values is described in the manual E-M-HW4v3-F2-022.
DRAFT