Detcon FP-100 - Manual (Page 26)

Model FP-100
FP-100 Instruction Manual Rev. 0.0 Page 22 of 30
F07 – Clearing Fault
If the sensor fails the clearing criteria during span calibration, a “Clearing Fault” will be declared, and ‘F07’
will be displayed. The sensor should be considered as “Out-of-Service” until a successful span calibration is
performed.
F08 – Stability Fault
If the sensor fails the signal stability criteria during span calibration, a “Stability Fault” will be declared and
the display will change to F08. The sensor should be considered as “Out-of-Service” until a successful span
calibration is performed.
F09 – Range Fault
If the sensor fails the minimum signal change criteria during span calibration a “Range Fault” will be declared,
and ‘F09’ will be displayed. The sensor should be considered “Out-of-Service” until a successful span
calibration is performed.
F10 – Sensor Current Fault
If the current flowing through the sensor cell is outside of acceptable levels, a “Sensor Current Fault” will be
declared, and the display will change to ‘F10’. If a Sensor Fault occurs, the 4-20mA signal will be set to 0mA
until the fault condition is resolved.
F11 – Zero Fault
If the sensor drifts below –10% LEL, a “Zero Fault” will be declared, and ‘F11’ will be displayed. If a Zero
Fault occurs, the 4-20mA signal will be set to 0mA until the fault condition is resolved. The sensor should be
considered “Out-of-Service” until a successful zero calibration is performed.
F12 – Sensor Voltage Fault
If the voltage applied to the sensor cell is outside of acceptable levels, a “Sensor Voltage Fault” will be
declared, and the display will change to ‘F12’. If a Sensor Fault occurs, the 4-20mA signal will be set to 0mA
until the fault condition is resolved.
CF – Communication Fault
This fault is displayed if the Display or Display Terminal PCA cannot communicate with the sensor assembly.
The 4-20mA signal will be set to 0mA until the fault condition is resolved.
5.2 Troubleshooting
Under-Range problems (F11)
Probable Cause: Sensor Baseline drifted lower, Interference gases,
Perform Zero Calibration. (Section 3.2.1 Zero Calibration)
Execute successful Span Calibration. (Section 3.2.2 Span Calibration)
Replace plug-in combustible sensor if error continues.
Stability problems (F08)
Probable Causes: Failed Sensor, empty or close to empty Cal Gas Cylinder, problems with cal gas and
delivery
Check validity of span gas using pull tube or other means (check MFG date on cal gas cylinder).
Check for obstructions affecting cal gas hitting sensor face (including being wet, blocked, or corroded).
Combustible sensors assemblies use a bottom housing assembly with an integral sinter/flame arrestor. Clean
or replace bottom housing assembly as necessary.
Replace the plug-in combustible sensor.