Detcon PI-700 - Manual (Page 44)

Model PI-700
PI-700 Instruction Manual Rev. 2.5 Page 40 of 54
 Verify adequate Sensor Life.
 Clean or replace the PID lamp.
 Replace the plug-in VOC sensor.
Stability Fault
Probable Causes: Failed Sensor, empty or close to empty Cal Gas Cylinder, or problems with cal gas and
delivery.
 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.
 If using Splashguard with Integral Cal Port, must use Calibration Wind Guard or air movement can
compromise span gas delivery.
 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 with 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.