Detcon FP-100 Manuel d'utilisateur télécharger pdf (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.

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Detcon FP-100 Manuel d'utilisateur Page 26

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