SMART Pressure Transmitter
FT3351 Series User Manual
July.2022
11 |
P a g e
FAHM Co
.
Industrial Automation
Doc. FT3351Rev1401-05
ensure the bottom of the drip loop is mounted lower than the conduit connections or the
transmitter housing based on Figure 8.
Figure 8 Recommended conduit connections
2.4.2
Wiring
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. 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.
3. 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.
Transmitter operates on 14 - 30 Vdc (14-29.4 Vdc for satisfaction of EX). The dc power supply
should provide power with less than two percent ripple. The recommended wiring for transmitter
was shown in Figure 9.
