5.10.2 Gain calibration
Gain DP 1
100 ppm 100%
The stepwise calibration process is described below.
Note: The specified warm-up times etc. must be strictly observed before starting the calibration
process.
Gain DP 1
Gain DP 1
_90 ppm
Step 4: Calculation of the new gain.
During calculation an underscore in line two runs from left
to right and the current value converges to the set test gas
concentration. The sesitivity is recalculated, too.
Gain DP 1
SAVE
Step 6: Save the newly calculated gain.
‘SAVE‘ is displayed as long as the function is executed.
Gain DP 1
0.0 ppm
After the value has been successfully stored, a square appears
on the right for a short time = Gain calibration is finished and
new gain offset has been stored with success.
Step 1: Display of the current value and of the sensitivity
from the last calibration.
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.
Gain DP 1
0.0 ppm
The display automatically goes to step 1: Display
Message Description
Current value too high
Test gas concentration > than set value
Internal error → replace sensor head
Current value too low No test gas or wrong test gas applied to the sensor.
Test gas too high
Test gas too low
The set test gas concentration must be between 30% and 90% of the measuring range.
Current value unstable
Appears when the sensor signal does not reach the calibration 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.
Sensitivity < Sensitivity of the sensor head < 30%, calibration no longer possible → replace 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:
Test Gas
XX.X ppm
Enter concentration of the test gas used.
This value is not cleared when exiting the menu, therefore always check if
the value is correct before calibrating.
User Guide | Danfoss Gas sensor, type DGS
20 | BC291049702513en-000201 © Danfoss | Climate Solutions | 2022.01
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