Detcon DM-700 - Manual (Page 37)

Model DM-700
DM-700 Instruction Manual Rev. 4.0 Page 33 of 48
 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
 Replace the plug-in toxic sensor.
Stability Fault
Probable Causes: Failed Sensor, empty or close to empty Cal Gas Cylinder, problems w/ 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
 Replace the plug-in toxic sensor.
Clearing Fault
Probable Causes: Failed Sensor, Cal Gas not removed at appropriate time, problems w/ cal gas and delivery,
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
 Replace the plug-in toxic sensor.
Poor Calibration Repeatability
Probable Causes: Failed Sensor, use of wrong Cal Gas or problems w/ cal gas and delivery, 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
 Replace the plug-in toxic sensor.
Unstable Output/ Sudden spiking
Possible Causes: Unstable power supply, inadequate grounding, or inadequate RFI protection.