Installation and Connection
NFP - rev. 04 / 23.05.2018
page 31
•
for mA-outputs the type
>DataPro 2x1 24 V / 24 V<
The flow velocity sensors are internally protected against overvoltage. In case of an expected
high hazard potential it is possible to protect the sensors by using a combination (on a single
end) of the following 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<
Permissible cable length
If using the sensors in Ex areas consider the connected loads of the overvoltage protection
devices as well as capacity and inductance of the NIVUS sensor cables (POA) additionally.
The maximum permissible NIVUS cable lengths in Ex areas are:
Single-side overvoltage protection: 135 m
Double-side overvoltage protection: 120 m
Observe the connection direction
Observe the non-reversed connection (p-side to transmitter) as well as a correct, straight
wiring supply. Ground (earth) must lead to the unprotected side.
The overvoltage protection devices are ineffective if wired incorrectly.
Содержание NFP
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