SMART Temperature Transmitter
PTT74-Ex Series User Manual
Sep.2020
7
www.faraboard .com
FAHM Co
.
Industrial Automation
Doc. PTT74-ExRev99/07M
2.3
Electrical considerations
Make sure all electrical installation is in accordance with national and local code
requirements.
2.3.1
Conduit installation
If all connections are not sealed, excess moisture accumulation can damage the transmitter.
Make sure to mount the transmitter with the electrical housing positioned downward for
drainage. To avoid moisture accumulation in the housing, install wiring with a drip loop, and
ensure the bottom of the drip loop is mounted lower than the conduit connections or the
transmitter housing based on
2.3.2
Wiring Instruction
Do not connect the power signal wiring to the test terminals. Voltage may burn out the
reverse-polarity protection diode in the test connection. Perform the following steps to
make wiring connections:
1.
Remove the housing cover on terminal compartment side. Do not remove the cover
in explosive atmospheres when the circuit is live. Signal wiring supplies all power to
the transmitter.
2.
Turn the display 90 degrees so that the void and screw are aligned, then Loosen the
screw.
Figure 7
3.
Gently disconnect the flat cable.
Figure 8
4.
For 4-20 mA HART output, connect the positive lead to the terminal marked (+) and
the negative lead to the terminal marked (-). Do not connect powered signal wiring
to the test terminals. Power could damage the test diode.
Figure 9
5.
Plug and seal unused conduit connection on the transmitter housing to avoid
moisture accumulation in the terminal side. Install wiring with a drip loop. Arrange
the drip loop so the bottom is lower than the conduit connections and the
transmitter housing.
Figure 8 Recommended conduit connections
