Det-Tronics PIRECL Infrared Carbon Dioxide Gas Detector PointWatch Eclipse - Manual (Page 23)

21 95-8676 2.1
5. Return to Normal is complete when:
A. The onboard LED changes from “off” to steady
green.
B. The LED within the PIRTB (if used) turns off.
C. The Eclipse current output returns to greater than/
equal to 4.35 mA after the detected calibration
gas level drops below 0.1%/vol of CO
2
, or the
calibration abort signal is provided.
TIMe oUT
If calibration is not completed within 10 minutes, a
calibration-failed fault is generated, and the unit returns
to normal operation using the previous calibration values.
NoTe
Under normal conditions, span calibration is
typically completed in 3 minutes or less.
CalIbraTIon aborT
Calibration can be aborted at any time after zero
calibration is completed. This is done by activating the
onboard or PIRTB magnetic switch, or by a command
from the HART or MODBUS interface. If calibration is
terminated, the new zero point is retained, and a zero
calibration code is saved in the calibration history buffer.
The unit will immediately return to normal operation.
table 5—Quick Reference Guide for Zero only Calibration Procedure using Magnetic Switch
table 4—Quick Reference Guide for normal Calibration Procedure using Magnetic Switch
Description
Indicating leD
(pIreCl/pIrTb)
Current output
(default setting)
operator action
Normal-ready to calibrate steady green/off ≥ 4.35 mA* Purge with pure nitrogen if required
Initiate Calibration steady red/on-steady 1 mA
Apply Nitrogen, apply Magnet for 2
seconds min.
Zero Calibration complete flashing red/on-flashing 1 mA
Remove Nitrogen, and apply 1% v/v
CO
2
Calibration Gas to device
Span Calibration in progress flashing red/on-flashing 1 mA Continue cal gas flow
Span Calibration complete off/on-steady 1 mA Remove Calibration Gas
Output Returns to Normal steady green/off ≥ 4.35 mA* Calibration Completed
Normal Operation steady green/off ≥ 4.35 mA* None
*Depending on the ambient CO
2
concentration.
Description
Indicating leD
(pIreCl/pIrTb)
Current output
(default setting)
operator action
Normal-ready to calibrate steady green/off ≥ 4.35 mA* Purge with pure nitrogen if required
Initiate Calibration steady red/on-steady 1 mA
Apply Nitrogen, and apply Magnet for
2 seconds min.
Zero Calibration complete flashing red/on-flashing 1 mA
Re-initiate magnetic switch
to terminate calibration
Return to Normal Mode steady green/off ≥ 4.35 mA*
Remove Nitrogen to complete Zero
Calibration
*Depending on the ambient CO
2
concentration.