Instruction Manual
OCM F
OCM F - Rev. 04 as of 18.02.2014
Page 29
Fig. 7-14
DC model power supply
7.6
Overvoltage Protection Precautions
Using overvoltage protection elements for sensor protection reduces the pos-
sible maximum cable length.
The series resistance is 0.3 Ohm per wire and must be added to the maxi-
mum permissible total resistance (please refer to the "Technical Instruction of
Doppler Sensors" manual)
For effective protection of the OCM F transmitter it is necessary to protect power
supply and mA inputs and outputs.
NIVUS recommends surge arrestors type:
>EnerPro< 220 Tr< (at 230 V AC) or
>EnerPro 24 V< (at 24 V DC).
For mA outputs and inputs type:
>DataPro 2x1 24 V / 24 V<
The flow velocity sensor is internally protected against overvoltage. In case of an
expected high hazard potential it is possible to protect the sensor by using a
combination of the Types:
For Ex-Sensors:
>SonicPro 3x1 24 V / 24 V Ex< and >DataPro 2x1 12 V / 12 V 11μH Tr (N)<
For Non-Ex-Sensors:
>SonicPro 3x1 24 V / 24 V< and >DataPro 2x1 24 V / 24 V Tr<
Summary of Contents for osm-f
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