Rosemount Analytical 54C - RTD Resistance Values; Circuit Board Replacement

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5-7

MODEL 54 C SECTION 5

DIAGNOSTICS AND TROUBLESHOOTING

5.5 RTD RESISTANCE VALUES

Table 5-3 (below) is a ready reference of RTD resist-

ance values at various temperatures. These are used

for test and evaluation of the sensor.

NOTE

Ohmic values are read across the RTD element and

are based on the manufacturer’s stated values of

(±1%). Allow enough time for the RTD element in the

sensor to stabilize to the surrounding temperature.

Table 5-3. RTD Resistance Values

Temperature Pt-100 Pt-1000

Resistance Resistance

0°C 100.00 ohms 1000 ohms

10°C 103.90 ohms 1039 ohms

20°C 107.79 ohms 1078 ohms

25°C 109.62 ohms 1096 ohms

30°C 111.67 ohms 1117 ohms

40°C 115.54 ohms 1155 ohms

50°C 119.40 ohms 1194 ohms

60°C 123.24 ohms 1232 ohms

70°C 127.07 ohms 1271 ohms

80°C 130.89 ohms 1309 ohms

90°C 134.70 ohms 1347 ohms

100°C 138.50 ohms 1385 ohms

5.6 CIRCUIT BOARD

REPLACEMENT

If it is necessary to replace the CPU Circuit Board or

Power Supply Circuit Board, specific procedures for

calibration (included with the new circuit board) must

be followed exactly or the microprocessor will be

improperly programmed. Should this occur, it will be

necessary to return the entire analyzer to the factory

for reprogramming.

See Section 6.0

for part numbers of replacement

boards and other parts.