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6 | PRIOR TO INSTALLATION | GEOKON
For Models 4200, 4200L, 4200-6, 4200-7, and 4210/12/14 it should be
about 180 ohms.
For Model 4202, it should be about 50 ohms.
Remember to add the cable resistance at approximately 14.7/1000' or
48.5/km at 20 °C. Multiply these factors by two to account for both
directions.
2.
Using an ohmmeter, check the resistance between the two thermistor wires
(usually white and green). Using Table 11 on page 24, convert the
resistance to temperature. Compare the result to the current ambient
temperature. (For Model 4200HT see Table 12 on page 25.)
3.
Connect the gauge to a readout box. (See readout instructions, Section 5.)
Observe the displayed readout. The reading should be about the midrange
position as defined in Table 2 on page 11.
4.
Press on the gauge ends and confirm that it makes the reading decrease.
Return any faulty gauges to the factory. Gauges should not be opened in the
field.
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