USING THE LEAK SIZE INDICATOR AND SENSITIVITY SETTINGS
Once the CGD900 has been started up, the digital leak size indicator
normally remains off (the display is blank). But once the instrument de-
tects a leak, a number from 1 to 9 is displayed in the window—regard-
less of the unit’s sensitivity setting.
The number displayed reflects the concentration of combustible gas
sensed. The maximum value is displayed when the tip of the probe is
at the source of the leak. Try switching between different sensitivity set-
tings while moving the probe until the highest number appears.
When the unit has reached the Ready state, the unit automatically
defaults to the normal sensitivity level (the green LED labeled NORM is
illuminated). To raise the sensitivity level, press the SENS. button once;
this lights the red LED labeled HI. To lower the sensitivity level, press
the SENS. button again; this lights the yellow LED labeled LO.
USING THE LEAK TEST VIAL
The CGD900 ships with a leak test vial that lets you check whether the
instrument is working properly. To perform this test:
• Remove the plastic cap from the leak test vial (it pops off,
rather than unscrews).
• Turn the instrument on and wait for it to heat the sensor
(the display goes blank and the green LED labeled NORM
illuminates).
• Place the tip of the probe close to the small hole in the top
of the leak test vial. If the unit is working properly, the unit’s
beep rate should increase and the digital leak size indicator
should display a number between 4 and 6. If you do not get
these readings, you should replace the sensor (see p.6).
NOTE:
Always remember to replace the plastic seal cap
on the leak test vial after completing this test. Replace
the leak test vial when its contents no longer appear
green.
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