6 Commissioning / Shutdown
66
6.4.5 CO calibration with test gas
Connect test gas at the hose connector “test gas” of the PCB, with a prepressure of
0,3bar.
Example for test gas: 3 Vol.% O
2
, 100ppm CO, 100ppm H
2
, in N
2
A test gas CO in N
2
is not suitable for calibration. A test gas must always contents O
2
in the range of %.
NOTE:
The calibration/check with CO- test gas only works with CO values > 0ppm.
Menu function
When you press the [cal] menu key, “Start calibration” appears in the display.
• Open the shut-off plug valve in the PCB
• Set the pressure rise “dp” to 2...3mbar via the test gas throttle in the PCB
• Start calibration
• When calibration starts, there is a waiting time of 5 seconds before the values are
displayed.
• Change the COe-value with the cursor keys
• Press OK
• Following successful calibration, close the shut-off plug valve
CAUTION:
If you are calibrating the measurement value using the display and operating unit →
cal, you must confirm the new calibration value with “ENTER” or “OK”. Otherwise, the
menu ends automatically after 15 seconds, and the new calibration value is rejected.
NOTE:
The KS1-DK combination probe does not measure CO selectively, but measures the
sum total of oxidising exhaust gas constituents (CO/H
2
). In the case of fuels the
composition of which remains constant, the CO content in the exhaust gas can be
estimated with limited accuracy (+/- 25% of the respective measurement value, not
better than +/-20ppm ) on the basis of the oxidising exhaust gas constituents..
6.5 Ending calibration
• Leave the menu with EXIT
• Switch off MAINTENANCE
- CO + CO
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