41
Maintenance
● Press the key to carry out the calibra-
tion of the selected measuring channel.
— The calibration gas concentration is dis-
played.
● Press the [OK] key to confirm the cali-
bration gas concentration or use the [+]
key to change the calibration gas concen-
tration and complete the process by pres-
sing the [OK] key.
— The measurement value flashes.
● Open the test gas cylinder valve to let test
gas flow over the sensor.
— The displayed, flashing measurement va-
lue changes to the value according to the
supplied test gas.
When the displayed value has stabilized
(after at least 120 seconds):
● Press the key.
— The display containing the current gas
concentration changes with the display
»OK«.
● Press the key to quit the calibration of
this measuring channel.
— The next measuring channel is offered for
calibration.
— After the last measuring channel has
been calibrated/adjusted, the device swit-
ches to measuring mode.
● Close the test gas cylinder valve and re-
move the device from the calibration cr-
adle.
If a fault has occurred during the span ca-
libration.
— The fault message » « appears and
» « is displayed for the respecti-
ve sensor instead of the measured value
● In this case, repeat the calibration.
● If necessary, replace the sensor,
page 46.
Note on adjusting the Ex channel to
nonane as the measured gas:
— When calibrating the Ex channel, pro-
pane can be used as a substitute for the
calibration gas.
— When using propane to adjust the Ex
channel to nonane, the display must be
set to 2x the test gas concentration used.
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