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Electrical connection
12
5
Electrical connection
CAUTION
L
‣
Switch off the power supply before installing or connecting the device. Failure to
observe this may result in the destruction of parts of the electronics.
‣
Do not occupy the CDI interface. An incorrect connection can destroy the electronics.
NOTICE
Do not overtighten the screw terminals, as this could damage the transmitter.
‣
Maximum tightening torque = 1 Nm (³⁄₄ lbf ft).
5.1
Connecting requirements
A Phillips head screwdriver is required to wire the head transmitter with screw terminals.
Proceed as follows to wire a mounted head transmitter:
1. Open the cable gland and the housing cover on the terminal head or the field
housing.
2. Feed the cables through the opening in the cable gland.
3. Connect the cables as shown in → 12.
4. Tighten the cable gland again and close the housing cover.
In order to avoid connection errors always follow the instructions in the post-connection
check section before commissioning!
5.2
Connecting the sensor cables
RD
RD
WH
WH
3
Assignment of terminal connections for head transmitter
1
Sensor input, RTD and Ω, 4-, 3- and 2-wire
2
Sensor input, TC and mV
3
CDI interface
4
Bus terminator and power supply
A minimum load of 250 Ω is required in the signal circuit in order to operate the HART
transmitter via the HART
NOTICE
‣
ESD – Electrostatic discharge. Protect the terminals from electrostatic discharge.
Failure to observe this may result in the destruction or malfunction of parts of the
electronics.
1
®
protocol (terminals 1 and 2).
iTEMP TMT182B
2
6
5
1+
2-
4
3
3
Endress+Hauser
4
+
-
A0050636
®
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