Heinrichs Messtechnik
Installation and Operation Manual PITe
Page 17 of 22
10 Power supply / electrical connection
See name plate or Operating Instructions of the UMF2 (B) transmitter.
10.1 Electrical connection
The outer shield must be connected to the “PE” Terminal. The inner shields are each to be connected
to there respective “FE” terminal.
Caution:
When placing the blank shield wires into the respective terminals, take care not
to cause short circuits.
Connecting the sensor cable to the terminal box of the
UMF2 (B) transmitter
Connecting the cable shield in the cable gland
To abide to EMC requirements, the outer shield of the cable must be unbraided, folded back over the
plastic insert and cut to length as can be seen in the graphic below. The unbraided strands must lie
over the O-ring whos function it is to press the braids of the outer shield onto the metal cable gland.
This O-ring does
not
serve the purpose of a sealant.
10.2 Cable specification
The following interconnecting cable is used:
The Electrodes and exciter coil are connected using shielded twisted pair wires which have a wire
cross section of 0,75mm² e.g. SLIYCY-C11Y ( 2x ( 2x 0.75mm²)). To protect the cable from external
interferences, an additional outer shield covers the twisted-pair wires.
The twisted pair shields are connected to the FE terminals in the junction box of the transmitter, and
the outer shield is grounded by means of the special EMC-compliant cable gland of the junction box.
Caution:
Do not connect or disconnect the exciter coil cable to the transmitter before the main power
supply of the meter has been disconnected!
