Detcon FP-700 - Manual (Page 36)

Model FP-700
FP-700 Instruction Manual Rev. 3.0 Page 32 of 40
 Check Bridge Voltage (should be 2.7 +/- 0.2VDC).
 Check validity of span gas and flow rate (check MFG date on cal cylinder).
 If using Splashguard with Integral Cal Port, must use Calibration Wind Guard or air movement can
compromise span gas delivery.
 Make sure correct Cal Factor is set
 Check for obstructions through stainless steel sinter element (including being wet).
 Replace the plug-in sensor.
Clearing Fault
Probable Causes: Failed Sensor, Cal Gas not removed at appropriate time, problems w/ cal gas and delivery,
or Background combustible gases preventing clearing.
 Confirm that no combustible gasses are present in background.
 Check Bridge Voltage (should be 2.7 +/- 0.2VDC).
 Check validity of span gas and flow rate (check MFG date on cal cylinder).
 Make sure correct Cal Factor and Gas Factor is set
 Check for obstructions through stainless steel sinter element (including being wet).
 Replace the plug-in sensor.
Poor Calibration Repeatability
Probable Causes: Failed Sensor, use of wrong Cal Gas, problems w/ cal gas and delivery, or Poison or
Inhibitor Gases.
 Check for adequate Sensor Life.
 Check Bridge Voltage (should be 2.7 +/- 0.2VDC).
 Check validity of span gas and flow rate (check MFG date on cal cylinder).
 Check for obstructions through stainless steel sinter element (including being wet).
 Evaluate area for presence of poisoning or inhibiting gases as listed in Section 2.3.
 Increase calibration frequency.
 Note the sensor’s serial # and report repetitive problems to Detcon’s Repair Department.
 Replace plug-in sensor.
Unstable Output/ Sudden spiking
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.
Nuisance Alarms
 Check condulet for accumulated water and abnormal corrosion on terminal blocks.
 If nuisance alarms are happening at night, suspect condensation in condulet.
 Add or replace Detcon’s Condensation Prevention Packet P/N 960-202200-000.
 Investigate the presence of any other combustible gases that may be causing sensor response.
Processor and/or Memory Faults
 Recycle power in attempt to clear problem