Detcon FP-100 - Manual (Page 27)

Model FP-100
FP-100 Instruction Manual Rev. 0.0 Page 23 of 30
Clearing problem (F07)
Probable Causes: Failed Sensor, Cal Gas not removed at appropriate time, problems with cal gas and delivery.
The sensor must recover to < 5% of range in < 5 min after Span calibration is complete, use bottled air if there
is a known continuous background level of combustible gas.
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.
Poor Calibration Repeatability (F09)
Probable Causes: Failed Sensor, use of wrong Cal Gas or problems with cal gas and delivery.
Check validity of span gas with regulator and sample tubing in place 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.
Unstable Output/ sudden spiking (F03, F04)
Possible Causes: Unstable power supply, inadequate grounding, or inadequate RFI protection.
Verify Power source is stable.
Verify field wiring is properly shielded and grounded.
Contact Detcon to optimize shielding and grounding.
Add Detcon’s RFI Protection Circuit accessory if problem is proven RFI induced.
Nuisance Alarms
Check condulet for accumulated water and abnormal corrosion on terminal board.
If nuisance alarms are happening at night, suspect condensation in condulet.
Add or replace Detcon’s Condensation Prevention Packet P/N 960-202200-000.
Determine if cause is RFI induced.
Unreadable Display (if a 100 Series Display is installed)
If due to excessive sunlight, install a sunshade to reduce glare.
Replace Display Assembly
Replace 100 Series Display.
Blank or incorrect reading on Display (if a 100 Series Display is installed)
ITM has an internal fault, problem with display.
Swap with a known-good ITM to determine if ITM is faulty.
Swap Model 100 Display Terminal Board with known good board
Swap Model 100 Display with known good display.
Transmitter not responding (F05, F06)
Verify condulet has no accumulated water or abnormal corrosion.
Verify required DC power is applied to correct terminals.
Swap with a known-good ITM to determine if ITM is faulty.