4.2 Taking a Gas Reading
To verify that the instrument is operating, sample a known
combustible gas (e.g., a gas-air mixture from an unlit burner
of a natural-gas range). If no response is observed or heard,
refer to Section 6.0 Troubleshooting.
Important! The sensor becomes less sensitive
after being exposed to an excessive amount of
gas. Therefore, after testing the instrument as
described above, leave it on for several minutes
to restabilize the sensor.
Take a gas reading by positioning the end of the instrument’s
fl exible probe near the area to be sampled.
The presence of a combustible gas is indicated by a column of
ten red LEDs and a speaker. The number of lighted LEDs gives
visual indication of the relative gas level, while the speaker
produces clicking sounds, similar to a Geiger counter, that
increase in repetition rate as the gas concentration goes up
in relation to the instrument’s gain setting.
The instrument’s sensitivity to gas concentrations is adjusted
by means of its thumb-wheel Gain control. Clockwise rotation
increases sensitivity, while counterclockwise rotation decreases
sensitivity. The Gain control is useful in pinpointing large leaks
by starting with the control set to light 1 or 2 LEDs, and then
gradually rotating the control counterclockwise as the probe
gets closer to the leak.
Operation
6
Leakator 10
Instruction 0019-9167
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