TESTO 350 - Tips and Assistance; Questions and Answers

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8 Tips and assistance
8.1. Questions and answers
Question Possible causes/solution
Rechargeable battery low > Switch to AC power supply.
Analyzer box switches
automatically off or
analyzer box cannot be
switch on
Batteries/rechargeable batteries
empty.
> Charge rechargeable batteries or
switch to AC power supply.
NO value drifts
Auxiliary voltage for NO sensor was
interrupted, i.e. by a sensor change.
> Wait until sensor has regenerated.
Stable NO measurement only
possible after approx. 2 hr.
Double module
A sensor of the same type has already
been plugged in.
Dilution
Gas flow rate in dilution path too high /
too low
> Please contact your local dealer or
the Testo Customer Service.
O
2
sensor exhausted > Replace the O
2
sensor
... Signal too high Signal of indicated sensor is too high.
> Wait until regenerated (additional
zeroing starts automatically).
> Ensure fresh air supply
... Signal not stable
Signal of indicated sensor is drifts
excessively (defect).
> Change sensor.
> Wait until regenerated (additional
zeroing starts automatically).
> Ensure fresh air supply
... Switch-off
Reading of indicated sensor is higher
than the set switch-off threshold.
Instrument temperature
Instrument temperature is beyond the
operating temperature.
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