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Temp. (°C) Pt 100 (
ΩΩ
) Pt 1000 (
ΩΩ
)
0 100.0 1000
10 103.9 1039
20 107.8 1078
25 109.7 1097
30 111.7 1117
40 115.5 1155
50 119.4 1194
60 123.2 1232
70 127.1 1271
80 130.9 1309
85 132.8 1328
90 134.7 1347
100 138.5 1385
74
MODEL SOLU COMP II SECTION 8.0
TROUBLESHOOTING
8.8 SIMULATING TEMPERATURE
8.8.1 General.
The Solu Comp II accepts either a Pt100 or a Pt1000
RTD in a three-wire configuration. See Figure 8-5.
8.8.2 Simulating temperature
To simulate the temperature input, wire a decade box to
the analyzer or junction box as shown in Figure 8-6.
To check the accuracy of the temperature measure-
ment, set the resistor simulating the RTD to the values
indicated in the table and note the temperature read-
ings. The measured temperature might not agree with
the value in the table. During sensor calibration an offset
might have been applied to make the measured tem-
perature agree with a standard thermometer. The offset
is also applied to the simulated resistance. The Solu
Comp II is measuring temperature correctly if the differ-
ence between measured temperatures equals the differ-
ence between the values in the table to within ±0.1°C.
For example, start with a simulated resistance of 103.9
Ω, which corresponds to 10.0°C. Assume the offset from
the sensor calibration was -0.3 Ω. Because of the offset,
the analyzer calculates temperature using 103.6 Ω. The
result is 9.2°C. Now change the resistance to 107.8 Ω,
which corresponds to 20.0°C. The analyzer uses 107.5 Ω
to calculate the temperature, so the display reads
19.2°C. Because the difference between the displayed
temperatures (10.0°C) is the same as the difference
between the simulated temperatures, the analyzer is
working correctly.
FIGURE 8-5. Three-Wire RTD Configuration.
Although only two wires are required to connect
the RTD to the analyzer, using a third (and some-
times fourth) wire allows the analyzer to correct for
the resistance of the lead wires and for changes in
the lead wire resistance with temperature.
FIGURE 8-6. Simulating RTD Inputs.