TESTO 350 - Sensor Protection; Calibration;Adjustment

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6.1.4.3. Sensor protection
Protection limits can be set to protect the sensors against overload.
The sensor protection switch-off is available for the following
sensors: H
2
S, NO, NO
2
, CO
2
-(IR), CxHy, CO, SO
2
.
The sensor protection is activated if the threshold is exceeded, the
measuring gas is diluted. If the threshold is exceeded again, the
system will be shut down.
To deactivate sensor protection the thresholds must be set to
0ppm.
Activating the function:
> [
] → Sensor settings → [OK] → Sensor protection →
[Change].
Setting sensor protection thresholds:
1. Select parameter: [Change]
2. Set parameter → [OK]
3. Save changes: [Finished]
6.1.4.4. Calibration/adjustment
CO-, SO
2
-, NO
2
-, NO-, O
2
- and CO
2
-(IR)-sensors can be tested
(calibrated) and adjusted.
The calibration of the O
2
- sensor (O
2
reference) generally takes
place in the same way as the calibration of the toxic sensors. The
entered nominal O
2
-value is only temporary, i.e. the nominal value
will be overwritten the device is switched off and on again the next
time or in case of zeroing. The same applies when a measuring
program passes through a zeroing phase. The O
2
test gas must
also be applied to the measuring gas input (as with the toxic
sensors).
If obviously unrealistic readings are displayed, the sensors
should be checked (calibrated) and, if required, adjusted.
Have the calibration/adjustment carried out by qualified
personnel.
To ensure that specific accuracies are retained, testo
recommends testing every six months and recalibration
when required, except when required by local or state
regulations.
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