Hart® Dcv Setup; Hart® Module Positions; Field Wiring - GE Masoneilan SVI II ESD Installation And Maintenance Manual

®
HART DCV Setup
Provided below are instructions for setting up the HART Multiplexer HMU16-P250 for DCV
mode application.
®
HART Module Positions
The MTL4841 communications module is mounted in the first available position nearest to
RS485 connection terminals. The MTL4842 module is mounted in the last available position
nearest to field wiring terminations.

Field Wiring

Wiring terminations are shown in Figure 88. The transmitter's and the valve's Tx+ terminal is
used to supply 24 VDC to the field device. On the system side, the transmitter signal is
measured across Ch+ and Ch- while valve signal is simply returned to 0 VDC.
MTL4842
expansion bus
NTL 4841 Communications Module
Reserved Slot*
MTL 4842 Multiplexer Module
TX
I/P
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Field
Terminals
TX+
Ch+
Ch-
TX+
Ch+
Ch-
Figure 88 HART
HMU16-P250
HART
®
Device in DCV Application
Masoneilan SVI II ESD Installation and Maintenance Manual
RS485 link
to host
24V HART
MUX power
System
Terminals
TX+
Ch+
Ch-
TX+
Ch+
Ch-
+24 VDC
Signal +
Signal -
+24 VDC
0 VDC
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