OLCT 700/710 TP
OLCT 700/710 TP Instruction Manual Rev. C.1 Page 25 of 45
Stability Fault - AutoSpan
If the sensor fails the signal stability criteria during AutoSpan sequence (Section 3.4), the “Stability Fault”
will be declared. A “Stability Fault” will cause a “Fault Detected” message to scroll once a minute on the
display and drop the mA output to 0mA. The Modbus™ fault register bit for Stability Fault will be set and
will not clear until the fault condition has been cleared. The OLCT 700/710 should be considered as “Out-
of-Service” until a successful AutoSpan calibration is performed.
Clearing Fault - AutoSpan
If the sensor fails the signal stability criteria during AutoSpan sequence (Section 3.4), the “Clearing Fault”
will be declared. A “Clearing Fault” will cause a “Fault Detected” message to scroll once a minute on the
display and drop the mA output to 0mA. The Modbus™ fault register bit for Clearing Fault will be set and
will not clear until the fault condition has been cleared. The OLCT 700/710 should be considered as “Out-
of-Service” until a successful AutoSpan calibration is performed.
Open Heater Fault
If the sensor heater should fail and become electrically open, a “Heater Fault” will be declared. A “Heater
Fault” will cause a “Fault Detected” message to scroll once a minute on the display. The Modbus™ fault
register bit for Heater Fault will be set and will not clear until the fault condition has been cleared. If a
Heater Fault occurs, the 4-20mA signal will be set at 0mA until the fault condition is resolved.
Open Sensor Fault
If the sensor film should fail and become electrically open, a “Sensor Fault” is declared. A “Sensor Fault”
will cause a “Fault Detected” message to scroll once a minute on the display. The Modbus™ fault register
bit for Sensor Fault will be set and will not clear until the fault condition has been cleared. If a Sensor Fault
occurs, the 4-20mA signal will be set at 0mA until the fault condition is resolved.
Processor Fault
If the OLCT 700/710 has any unrecoverable run-time errors, a “Processor Fault” is declared. A “Processor
Fault” will cause a “Fault Detected” message to scroll once a minute on the display. The Modbus™ fault
register bit for Processor Fault will be set and will not clear until the fault condition has been cleared. If a
Processor Fault occurs, the 4-20mA signal will be set at 0mA until the fault condition is resolved.
Memory Fault
If the OLCT 700/710 has a failure in saving new data to memory, a “Memory Fault” is declared. A
“Memory Fault” will cause the “Fault Detected” message to scroll once a minute on the display. The
Modbus™ fault register bit for Memory Fault will be set and will not clear until the fault condition has
been cleared. If a Memory Fault occurs, the 4-20mA signal will be set at 0mA until the fault condition is
resolved.
4-20mA Loop Fault
If the OLCT700/710 detects a condition where the 4-20mA output loop is not functional (high loop
resistance or failed circuit function) a “4-20mA Fault” is declared. A “4-20mA Fault” will cause the “Fault
Detected” message to scroll once a minute on the display. The Modbus™ fault register bit for Loop Fault
will be set and will not clear until the fault condition has been cleared. If a Loop Fault occurs, the 4-20mA
signal will be set at 0mA until the fault condition is resolved.
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