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4-7. Changing the concentration measuring mode
In the detector, the detection gas type is factory set to R600a (Isobutane) and the alarm setpoint is factory
set to 30 ppm.
The detector has 5 preset alarm setpoints that the user can cycle through (10 ppm, 30 ppm, 150 ppm, 500
ppm, and 2000 ppm).
For the measuring mode, the concentration measuring mode or differential measuring mode can be
selected.
<Concentration measuring mode>
Perform air calibration in the atmosphere.
Then, the mode monitors changes to the air value, showing the correlation between a leakage amount and
the bar display.
(If the measured atmosphere changes, perform air calibration again.)
<Differential measuring mode>
Perform automatic air calibration at regular intervals in the atmosphere of measurement environment. This
is a high sensitivity mode that enables detection of ultralow amounts of leaking gas in the air by eliminating
the environmental effects (other gases, temperature and humidity). Since it can detect a slight amount of
increase in gas concentration even in the environment where a gas is leaking already, this measuring
mode is effective to identify a leaking point.
In the differential measuring mode, "LOW MODE"(low sensitivity) and "HIGH MODE"(high sensitivity) can
be switched. When the detector cannot detect gas leakage in “LOW MODE”, switching to “HIGH MODE”
will allow detection of an ultralow gas leak.
Gas alarm setpoint for concentration measuring mode
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