Detcon PI-700 0-500ppb - Manual (Page 41)

Model PI-700 0-500ppb
PI-700 0-500ppb Instruction Manual Rev. 0.0 Page 37 of 53
Check validity of span gas using pull tube or other means (check MFG date on cal gas cylinder).
Use proper cal gas regulators and tubing for highly corrosive gasses.
Check for obstructions affecting cal gas hitting sensor face (including being wet, blocked, or corroded).
Verify adequate Sensor Life.
Clean or replace the PID lamp.
Replace the plug-in VOC sensor.
Clearing Fault
Probable Causes: Failed Sensor, Cal Gas not removed at appropriate time, problems with cal gas and delivery,
or background of Target Gas.
Must recover to < 5% of range in < 5 min after AutoSpan is complete.
Use bottled air (zero air or N
2
) if there is a known continuous background level.
Check validity of span gas using pull tube or other means (check MFG date on cal gas cylinder).
Use proper cal gas regulators and tubing for highly corrosive gasses.
Check for obstructions affecting cal gas hitting sensor face (including being wet, blocked, or corroded).
Verify adequate Sensor Life.
Clean or replace the PID lamp.
Replace the plug-in VOC sensor.
Poor Calibration Repeatability
Probable Causes: Failed Sensor, use of wrong Cal Gas or problems w/ cal gas and delivery, or Interference
Gasses.
Check for adequate Sensor Life.
Check validity of span gas using pull tube or other means (check MFG date on cal gas cylinder).
Use proper cal gas regulators and tubing for highly corrosive gasses.
Check for obstructions affecting cal gas hitting sensor face (including being wet, blocked, or corroded).
Verify adequate Sensor Life.
Clean or replace the PID lamp.
Replace the plug-in VOC 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 other target gasses that are causing cross-interference signals.
Determine if cause is RFI induced.
Processor and/or Memory Faults
Recycle power in attempt to clear problem
Restore Factory Defaults - This will clear the processor’s memory and may correct problem.
Remember to re-enter all customer settings for range and cal gas level after Restore Factory Defaults.
If problem persists, replace the Intelligent Transmitter Module.