testo 0632 3330 Anwendungshinweise Seite 20

6. Using the probe
20
Use the gas leak detection probe to investigate the
premises/system to be tested for any concentrations
of gases.
- The detected gas concentration is indicated
visually (LEDs) and acoustically (ticker tone,
testo 330: Alarm signal must be switched on). The
rate of tones becomes faster as the gas
concentration rises and a constant tone is heard
when the alarm threshold is reached (testo 330:
Alarm signal must be switched on).
In some cases it may be necessary to suppress
background concentrations of gas. This can be done up
to max. 250 ppm.
Activating the function: press and hold
key) until a signal tone is heard.
- Gas concentration in the ambient air between
0...250 ppm:
The gas leak detection probe sets the zero point to
the actual gas concentration in the ambient air.
Gas concentration in the ambient air greater than
250 ppm:
The gas leak detection probe sets the zero point to
the maximum suppressible gas concentration of
250 ppm.
- The LED of the set gas type flashes. This indicates
that a background gas concentration is being
suppressed.
Deactivating the function: press and hold
key) until a signal tone is heard.
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