Simulating Temperature; General - Emerson Rosemount MCL-220 Manual

9.8

Simulating temperature

9.8.1

General

The MCL accepts a Pt100 RTD. The Pt100 RTD is a three-wire configuration.
See Figure
Figure 9-3:
Although only two wires are required to connect the RTD to the transmitter, using a third (and sometimes
fourth) wire allows the transmitter to correct for the resistance of the lead wires and for changes in the
lead wire resistance with temperature.
9.8.2 Simulating temperature
To simulate the temperature input, wire a decade box to the transmitter or junction box as
shown in
Instruction Manual
The voltage of a fresh 1.5 volt battery is about 1.6 volt (1600 mV).
9-3.
Three-Wire RTD Configuration
Figure 9-4.
Troubleshooting
75