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The menu » Calibration «
● Select » Back to menu « and press the » « key.
● Disconnect the flow of zero gas.
Zero-point calibration can be aborted at any time:
● Use the » « key to move to » Back « and press the » « key.
Submenu » Span cal. «
The submenu » Span cal. « Contains all functions for calibrating the sensitivity of the
installed sensor.
Sensitivity calibration
Calibration procedure (using an EC–H
2
S sensor as an example):
● Select the menu items » Calibration «, » Span calibration « and » EC–H
2
S « in this
order, pressing the » « key after each selection.
— The maintenance signal is transmitted on the analogue interface.
— The values for the calibration gas are displayed, for example:
— The calibration gas, concentration and unit can be changed:
● Select » Cal. gas « and press the » « key. Select the desired calibration gas
from the list and press the » « key again.
● Select » Concentr. « and press the » « key. Set the calibration gas concentra-
tion (same procedure as for input of a password).
● Select » Unit « and press the » « key: Select the desired unit from the list and
press the » « key again.
If the settings agree with the available calibration gas:
● Select » Next « and press the » « key.
— The message » Supply gas: H
2
S with flow rate 500 ml/min « is displayed.
— Connect calibration gas (see the information in the section "Maintenance" on
page 42) to the sensor.
● Select » Next « and press the » « key.
— The current value and the expired time are now displayed.
When the displayed value has stabilised:
● Select » Accept value « and press the » « key.
— In the display the maximum value and the current value as well as the remainder
of the sensor vitality are represented as a bar indication.
Cal. gas : H
2
S
Unit : ppm
Concentr. : 000025
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