8 Maintaining the product
13
Carrying out manual zeroing
The zero point can only be set manually if the currently detected gas
concentration is below the max. 250 ppm (max. 250 ppm can be suppressed).
For example:
150 ppm (≤ 250 ppm): are completely suppressed (display: 0 ppm)
1000 ppm (> 250 ppm): 250 ppm are suppressed (display: 750 ppm)
Gas concentrations present at the time of zeroing are suppressed by
zeroing. As a result, the displayed reading no longer corresponds to the
real gas concentration.
The instrument is in measurement view.
Briefly press [--> 0 <--].
The zero point for the current reading is reset or the current
suppression is cancelled.
On instruments with a display, the suppression of the reading is
symbolized by an arrow pointing downwards on the display.
The maximum reading can be zeroed using [max --> 0 <--].
Ventilate the sensor thoroughly after each use. To do this, place the
instrument in fresh air for approx. 2 minutes before using it again.
8 Maintaining the product
8.1 Changing batteries
The instrument indicates that the battery needs to be changed via a flashing,
empty battery symbol.
To change the battery, see the section “Inserting/changing batteries”.
8.2 Cleaning the instrument
If the housing of the instrument is dirty, clean it with a damp cloth.
Do not use any aggressive cleaning agents or solvents! Mild household
cleaning agents and soap suds may be used.
Storage & transportation
To prevent contamination of the sensor, please do not store or transport the
instrument in an environment where any tobacco smoke, foul air, oils, greases,
silicones, evaporating liquids or gases are present. Any sensor that is
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