Simulating Inputs - Temperature - Emerson Rosemount FCL Reference Manual

Troubleshoot
May 2019
9.10

Simulating inputs - temperature

9.10.1 General information about simulating temperature
The transmitter accepts a Pt100 resistance temperature device. The Pt100 resistance
temperature device is a three-wire configuration.
See Figure
Figure 9-3: Three-Wire RTD Configuration
A. Resistance temperature device
B. Resistance temperature device in
C. Resistance temperature device sense
D. Resistance temperature device return
Although only two wires are required to connect the resistance temperature device 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.
9.10.2 Simulate temperature
To simulate the temperature input, wire a decade box to the transmitter as shown in
Figure
Figure 9-4: Simulating Resistance Temperature Device Inputs
A. Resistance temperature device return
B. Resistance temperature device sense
C. Resistance temperature device in
D. Resistance temperature device shield
To check the accuracy of the temperature measurement, set the resistor simulating the
resistance temperature device to the values indicated in the table and note the
58
Voltage (mV)
-295.8
9-3.
9-4.
Reference Manual
pH (at 25 °C)
12.00
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