TESTO 340 Instruction Manual page 34

34
Dangerous gases
Danger of poisoning!
Observe safety regulations/accident prevention regulations when handling
test gases.
Use test gases in well ventilated rooms only.
Recalibration with low gas concentrations can lead to deviations in accuracy in the
upper measuring ranges.
Sensor protection is deactivated during recalibration. For this reason, test gas con-
centration should be lower than the maximum value of the sensors.
Recalibrating the sensor at slot 2 has an effect on the dilution:Always carry out a
recalibration of measurement parameters before a recalibration of dilution.
The following conditions must be met when recalibrating:
· Use absorption-free tube material
· Switch the measuring instrument on at least 20 min before recalibration (warming-up)
· Use clean air for gas zeroing
· Charge the test gas via calibration adapter (0554 1205, recommended) or the tip of
the probe
· Maximum overpressure of the test gas: 30 hPa (recommended: unpressurised via
bypass)
· Charge the test gas for at least 3 min
Recommended test gas concentrations and compositions are given in Testo's fi eld
guide to test gases.
1
Recalibration

- Possibly:Gas zeroing (30 s).
2 Select the parameter 
3 Charge the analyzer with test gas.
4 Start calibration:
If the parameter of the sensor inserted in slot 2 has been selected:
- You will receive a query as to whether dilution should be initialised.
Start recalibration of parameter:
Start recalibration of dilution:
5 Accept the nominal value as soon as the actual value is stable:
OK .
Change  Enter the test gas concentration (nominal value).
.
Start
No
Yes
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www.
.
Start

Start .

OK .
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