Bacharach The Informant2, Operation And Maintenance Manual

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The Informant™ 2
0019-9211 Rev 9 9
2.8. Locating a Gas Leak
After the detector is turned on and allowed to warm up, observe that
none of the gas-level LEDs should be glowing. Also note that both the
probe tip should be blinking and the audible indicator ticking once per
second. All of these indicators show that the detector is currently
not
detecting a change in gas concentration.
IMPORTANT: The detector’s function is to detect a change
in gas levels, and not to make a quantitative measurement of
the level. The technique of locating a leak by detecting a
change in level allows an operator to quickly locate the
source of a leak without making manual sensitivity
adjustments, or being concerned about the background
vapor or gas level in the surrounding area.
Leak testing can be performed with the probe either “docked” in its
storage position for close-up leak testing, or unfolded to its maximum
length of 20 inches (508 mm) for locating leaks in hard-to-reach areas.
Begin leak testing by slowly moving the probe toward the area to be
tested. If surfaces are dirty or wet, wipe them off with a clean shop towel
to prevent the filter from clogging. Avoid allowing water to enter the
probe tip.
When the detector first “sees” an increased gas level, all gas-level LEDs
immediately glow along with the probe tip blinking and audible indicator
ticking at a very rapid rate. If movement of the probe is stopped for more
than 10 seconds, the detector’s automatic self-zero feature will cause all
gas-level LEDs to turn off, along with decreasing the blinking and ticking
rate of the probe tip and audible indicator, respectively.
Once the presence of gas has been determined and the detector allowed
to self zero, moving the probe
toward the source of the leak will once
again cause the detector to respond in a positive manner. After which, if
the probe is moved away from the leak source, the detector will respond
with a lower gas-level indication.