Step 1: Physical Installation; Direct Mount - Emerson Smart Wireless THUM Adapter Quick Installation Manual

Quick Installation Guide
00825-0100-4075, Rev DA
July 2011
Figure 3. THUM Adapter Only, Powered by a 24 V Power Supply with 1200 Ohm resistor to limit
current to 20 mA
S 1: P
TEP HYSICAL
The THUM Adapter can be installed in one of two configurations:
Direct Mount: The THUM Adapter is connected directly to the conduit entry of the wired
device.
Figure 4. Direct Mount

Direct Mount

1. Install the HART device according to standard installation practices and the
manufacturer's instructions, being sure to use an approved thread sealant on all
connections.
2. Attach the THUM Adapter to the wired device as shown in Figure 4.
3. Connect the THUM Adapter to the HART wired device using the wiring diagrams below.
See Figures 21, 8, 10, and 12 on the following pages.
4. Close the housing cover on the HART wired device, so that metal touches metal, but do
not over tighten to prevent damaging the unit.
NOTE
Two splice connectors are included with the THUM Adapter. The first is a two
connection splice. The second is a three connection splice for use with a resistor, if
there is not enough resistance in the loop. Both of these splice connectors can
accept 14 to 22 gauge wire. See wired device reference manual for information on the
required loop resistance.
THUM Adapter
Green
Red
Black
White
Yellow
I
NSTALLATION
Smart Wireless THUM Adapter
Ground
1200 Ohm
Resistor
Required
HART
Modem
+
20 mA
Current
Source
-
5