15
3 Operation
3.2.2
Setting the zero point
In general, the device sets the zero point automatically. However,
in certain cases, values other than zero may be displayed when
the device is switched on. This indicates a deviating zero point,
meaning that the device must be adjusted manually to environ-
mental conditions.
Note:
The zero point must be set separately for each ap
-
plication. The zero point setting must be carried out
with fresh air.
To set the device to zero:
z
Press the key or the
key for approximately 2 seconds.
z
Use the or key to select the
Zero point
menu item.
z
Confirm your selection with the
key.
The device returns to measuring mode.
The displayed value is
zero
(0).
Note:
If the displayed value is not zero (0), this means that
the zero point of the device could not be set because
the measured value was outside the specified limits
(see appendix).
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