Detcon DM-600IS - Manual (Page 38)

DM-600IS
DM-600IS Instruction Manual Rev 1.5.9 Page 34 of 37
Sensor Fault
Probable Causes: Yellow wire is connected. Sensor has drifted since last zero cal.
1. Remove yellow wire if connected.
2. Redo Zero calibration
Zero Calibration Fault
Probable Causes: Target gas or Interfering gases in background during Zero Calibration, Failed
electrochemical sensor.
1. Verify no target or interfering gases are present.
2. Redo Zero and Span calibrations with validated Zero Gas and Span Gas standards.
3. If recovering after a start-up, give more time to stabilize.
Span Calibration Fault
Probable Causes: Failed electrochemical sensor, ice/mud/dust blocking sensor membrane, invalid span
calibration gas do to age and contamination or insufficient flow rate.
1. Verify there is no ice/mud/dust blocking sensor membrane.
2. Redo Span Calibration with validated Span Gas standard (check with Pull Tube).
3. Reinitialize unit by plugging in transmitter while holding the magnet on PGM1. Scroll through and
select the correct gas type. Make sure all customer settings are re-entered after “re-initialization”.
4. Replace with new electrochemical sensor.
Noisy Sensor (continuous drift) or suddenly Spiking
Probable Cause: Unstable power source, Inadequate grounding, Inadequate RFI protection.
1. Verify power Source output and stability.
2. Contact Detcon for assistance in optimizing shielding and grounding.
3. Add RFI Protection accessory available from Detcon.
LCD Difficult to Read
Probable Cause: Needs adjustment.
1. Adjust contrast pot as necessary.
Reporting “ERROR @ XXXXXXX”
Probable Cause: Span calibration calculation error.
1. Reinitialize unit by plugging in transmitter and then swiping the magnet over PGM1 while “Universal
Transmitter” is displayed. Scroll through and select the correct gas type and range (see section 13.0
Universal Transmitter Features). Make sure all customer specific settings are re-entered after “re-
initialization”.