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b.
In this case, repeat the fresh air adjustment. If necessary, have the
sensor replaced by qualified personnel.
6.10.2
Adjusting the sensitivity for an individual measuring channel
The span adjustment can be carried out selectively for individual sensors.
In the case of the span adjustment, the sensitivity of the selected sensor is
set to the value of the test gas used.
Use a standard test gas.
Allowed test gas concentration:
Ex:
40 to 100 %LEL
O
10 to 25 vol.%
2
CO: 20 to 999 ppm
H
S: 5 to 99 ppm
2
NO
5 to 99 ppm
2
Test gas concentrations of other gases: see Instructions for Use of the
respective DrägerSensors.
1
Connect the test gas cylinder with the calibration cradle.
2
Vent the test gas into a fume cupboard or into the open air (with a hose
connected to the second connector of the calibration cradle).
!
CAUTION
Never inhale the test gas. Health hazard!
Observe the hazard warnings of the relevant Safety Data Sheets.
3
Switch on the instrument and insert it into the calibration cradle.
Press the [ + ] key and keep it pressed for 5 seconds to open the calibration
4
menu, enter the password (password on delivery = 001).
5
Use the [ + ] key to select the single-gas adjustment function. The symbol
for span adjustment »
6
Press the [OK] key to start the channel selection.
The display flashes the gas of the first measuring channel,
e.g. » ch4 - %LEL «.
7
Press the [OK] key to start the adjustment function of this measuring
channel, or use the [ + ] key to select another measuring channel
(O
- vol.%, H
2
The test gas concentration is displayed.
8
Press the [OK] key to confirm the test gas concentration or use the [ + ] key
to change the test gas concentration and complete the process by pressing
the [OK] key.
The measurement value flashes.
« flashes.
S - ppm, CO - ppm, etc.).
2
Operation
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