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MODEL SOLU COMP II SECTION 8.0
TROUBLESHOOTING
8.2.3 RTD Sense Line for Sensor 1 is Open.
The Solu Comp II measures temperature using a three-wire RTD. See Figure 8-4. The in and return leads connect
the RTD to the measuring circuit in the analyzer. A third wire, called the sense line, is connected to the return line
at the sensor. The sense line allows the analyzer to correct for the resistance of the in and return leads and to cor-
rect for changes in lead wire resistance with temperature.
A. Verify that all wiring connections are secure.
B. The analyzer can be operated with the sense line open. The measurement will be less accurate because the
analyzer can no longer correct for lead wire resistance and for changes in lead wire resistance with ambient
temperature. However, if the sensor is to be used at approximately constant temperature, the lead wire resist-
ance error can be eliminated by calibrating the sensor at the measurement temperature. Errors caused by
changes in lead wire resistance with changes in ambient temperature cannot be eliminated.To make the error
message disappear, connect the RTD sense and return terminals with a jumper.
8.2.4 EEPROM Failure.
Call the factory at (800) 854-8257.
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