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136 Service Manual Part No.: 4417340 Revision 1
954 SmartServo FlexLine
Average Temperature Measurement (FII-RTD)
7.3.8.1 Introduction
The Field Interface Instrument - Resistance Temperature Detector (FII-
RTD) board is a sensor module for the instrument (gauge) and
calculates average product, Vapour- and ambient temperatures.
For accomplishing this, RTDs or MRTs must be directly connected to
the FII-RTD module
Figure 7-22
The FII-RTD board
There are four possible configurations to calculate the average product,
Vapour, and ambient temperatures using the FII-RTD board.
 1 or 2 RTDs in a 3-wire configuration.
 1 or 2 RTDs in a 4-wire configuration.
 2 through 6 RTDs as a probe called MPT. It should contain 1
wire per RTD + 2 common wires for all RTDs.
 2 through 6 MRTs as a probe. It should contain 1 wire per
MRT + 2 common wires for all MRTs.
NOTE: Only in RTD 3-wire or 4-wire configurations ambient
temperature calculation is possible.
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