ROTRONIC HM4 - Manual (Page 17)

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 17 of 41
Document Title
© 2014; ROTRONIC AG E-M-HM4-V0_08
Sensor Heating (RoHumiHeat), Value-Dependent
The sensor heating can be activated on the basis of definable temperature/humidity values.
Below a definable temperature threshold value
Above a definable temperature threshold value
Below a definable humidity threshold value
Above a definable humidity threshold value
The sensor heating is then activated as long as the measured temperature or humidity is below or above the
threshold value defined.
The temperature of the humidity sensor can be selected freely between 0.1 °C and 10 °C above ambient
temperature.
ROTRONIC offers the value-dependent heating function for applications in which value-dependent heating
suffices. Please note, however, that condensation could form on the sensor in an unheated state. If
condensation does form on the sensor when it is in operation, it can only be removed reliably with the
RoHumiClean function (five minutes cleaning at 150 °C).
Temperature differences of more than 3 °C between the sensor and environs caused by heating can have
effects on the external temperature measurement. This is particularly possible in stagnant air because the
heat energy is then not dissipated efficiently.
The start and stop responses follow the general function description above. The function "value-dependent
sensor heating" can be enabled/disabled with the HW4 software.
DRAFT