ROTRONIC HM4 - Manual (Page 12)

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 12 of 41
Document Title
© 2014; ROTRONIC AG E-M-HM4-V0_08
3.6 HW4 Software Compatibility
The devices in the HM4 series are fully integrated in the HW4 software V3.4 and later.
3.7 Real-Time Clock
The HM4 probes are equipped with a battery-powered real-time clock. The button battery of the type CR-1220
guarantees clock operation for a period of about 10 years. The battery of the real-time clock is only used when
the HM4 is not connected to an external power supply.
The real-time clock is set ex works and can be readjusted with the HW4 software. The maximum rate deviation
of the clock is ±5 minutes per month (<116 ppm).
3.8 Sensor Filter
The probe must be protected at all times against dust and weather influences by a polyethylene filter. The filter
has a pore size of 20 µm (ROTRONIC order code: NSP-25-PE).
DRAFT