5.10.1 Zero calibration
Zero DP 1
100 ppm
The stepwise calibration process is described below.
Note: The specified warm-up times etc. must be strictly observed before starting the calibration
process.
Zero DP 1
Zero DP 1
90 ppm
Step 4: Calculation of the new zero point.
During calculation an underscore in line two runs from left to
right and the current value drops to zero.
Zero DP 1
SAVE
Step 6: Save the newly calculated zero point.
“SAVE“ is displayed, as long as the function is executed.
Zero DP 1
0 ppm
After the value has been successfully stored, a square appears
on the right for a short time = zero point calibration is finished
and new zero offset has been stored with success.
Step 1: Display of the current value.
Step 2: Apply test gas according to instructions.
Step 3: Start calibration process.
Step 5: When the current value is stable, press for
finishing the calculation of the new value.
Zero DP 1
0 ppm
The display automatically goes to step 1: Display of new zero
point.
Message Description
Current value too high Wrong gas for zero point calibration or sensor element defective. Replace sensor head.
Current value too small Wrong gas for zero point calibration or sensor element defective. Replace sensor head
Current value unstable
Appears when the sensor signal does not reach the zero point within the target time. Disappears
automatically when the sensor signal is stable.
Time too short
The message “value unstable” starts an internal timer. Once the timer has run out and the current
value is still unstable, the text is displayed. The process starts over again. If the value is stable,
the current value is displayed and the calibration procedure is continued. If the cycle is repeated
several times, an internal error has occurred. Stop the calibration process and replace the sensor
head.
Internal error
Calibration is not possible → check if burning clean process is completed or interrupt it manually
or check/replace sensor head.
During the calculation phase, the following messages may occur:
If aborting the zero offset calibration, the offset value will not be updated. The sensor head continues
to use the “old” zero offset. A full calibration routine must be conducted to save any calibration
change.
User Guide | Danfoss Gas sensor, type DGS
© Danfoss | Climate Solutions | 2022.01 BC291049702513en-000201 | 19
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