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.

 

Temp. (°C)

Pt 100 (Ω)

Pt 1000 (Ω)

 

 

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

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Emerson PN 51-1055pHC/rev.K instruction manual Simulating temperature, Three-Wire RTD Configuration
Page 82 Page 84

PN 51-1055pHC/rev.K specifications

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