TESTO 340 Instruction Manual page 32

32
Setting sensor protection:
To extend the measuring range and protect the sensors against overloads, you can set
thresholds which, when exceeded, activate sensor protection. Thresholds for a variety
of parameters can be set, depending on the sensors that are connected.
For instruments without „Dilution of all sensors" option: If a threshold of the sensor in
slot 2 is exceeded, the gas to sensor 2 is diluted by a factor of fi ve.
There is switch-off if a sensor threshold value is exceeded in slot 3 or slot 4.
For devices with the „Dilute all sensors" option: If a sensor threshold value is excee-
ded in slot 2, the gas to sensor 2 is diluted by factor fi ve. If a sensor threshold value is
exceeded in slot 3 or slot 4, gas to all sensors is diluted by factor two.
With dilution active, the reading resolution and accuracies will change, see Technical
data. Diluted values are represented inversely.
If the threshold is still exceeded despite dilution, the instrument is switched off. To de ac-
tivate sensor protection, set the thresholds to 0 ppm.
1
Sensor protection
2 Select the parameter.
Option:
Reset selected parameter to default value:
3 Change  Set the values 
4 Repeat steps 2 and 3 for the other parameters accordingly.
Saving settings:
Measurement CO (H2-compensated) sensor:
In order to protect the sensor and for a longer sensor life, we recommend that in
measurements with unexpectedly high CO concentrations (more than 1,000ppm),
the CO sensor is installed in slot 2, and that the threshold of the CO sensor protecti-
on is set to 1,000ppm. From a CO concnetration of 1,000ppm, dilution with a factor
of 5 is automatically activated.
This setting can also be made if H2 concentrations of more than 1,000ppm are to be
expected.
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OK
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OK .
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OK Save input OK
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