O 2 Reference; Sensor Protection; Recalibration / Adjustment - TESTO 330 Instruction Manual

6 Using the product
6.1.3.2. O reference
2
The O2 reference value can be set.
The setting of the O2 reference value can be password protected,
see Password protection, page 51.
Calling up the function:
Possibly:
> Enter the password:
[OK].
Setting the O
> Set parameter → [OK].
6.1.3.3.

Sensor protection

Protection limits can be set to protect the sensors against overload.
The sensor protection switch-off is available for the following
sensors: CO, NO.
The sensor protection is activated if the threshold is exceeded.
• testo 330-1 LL: Switch-off.
• testo 330-2 LL: Dilution, if exceeded again: Switch-off.
To disable sensor protection the thresholds must be set to 0 ppm.
Calling up the function:
Setting sensor protection thresholds:
1. Select parameter: [Edit].
2. Set parameter → [OK].
3. Save changes: [Finished].
6.1.3.4.

Recalibration / adjustment

CO and NO sensors can be recalibrated and adjusted.
For recalibration / adjustment Testo recommends the use of the
calibration adapter 0554 1205.
Calling up the function:
52
[Enter]
reference:
2
If obviously unrealistic readings are displayed, the sensors
should be checked (calibrated) and, if required, adjusted.
Have the recalibration / adjustment carried out by a
qualified service center approved by Testo.
Adjustments made with low gas concentrations can lead to
accuracy deviations in the upper measuring ranges.
→ Enter password → [Next] →