Danfoss DGS Series, User Manual, Page: 17 / 24

User Guide
|
Danfoss Gas sensor. Type DGS. Modbus or Service Tool display operation
17 | RS8KD102
© Danfoss | DCS (ADAP-KOOL®) | 2018.12
4.9.2
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
Apply test gas according to instructions.
Gain DP 1
_90 ppm
Step 2: Calculation of the new gain
During calculation an underscore in line 2 runs from left to
right and the current value converges to the set test gas
concentration. The sesitivity is recalucated, too.
Gain DP 1
SAVE
Step 3: 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
Start calibration process.
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 Internal , unrecoverable error
→
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 isn’t cleared when exiting the menu, therefore before calibrating
always check the value if correct.