40
Maintenance
● Press the key to carry out the
calibration of the selected measuring
channel.
● Enter the concentration of the test gas –
procedure similar to the enter password
procedure.
● Complete the entry of the concentration
by pressing the key.
● Open the test gas cylinder valve to let test
gas flow over the sensor.
— The displayed, flashing measurement
value changes to the value according to
the supplied test gas.
When the displayed value has stabilized:
● Press the key.
— The display containing the current gas
concentration changes with the display
» OK «.
● Press the key to exit the calibration.
— The next measuring channel is offered for
calibration.
— After the last measuring channel has
been calibrated/adjusted, the device
switches to measuring mode.
● Close the test gas cylinder valve and
remove the device from the calibration
cradle.
If a fault has occurred during the span
calibration.
— The fault message » « appears and
» « is displayed for the respective
sensor instead of the measured value
● In this case, repeat the calibration.
● If necessary, replace the sensor,
page 45.
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