PROGRAMMING OF VRAE
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4.8.4 Change LEL/VOL Gas Selection
This function allows the users to choose one of the pre-
stored LEL gases in the monitor and calculate its correction
factor relative to the LEL calibration gas. This factor will
then be used during gas measurements to show the
equivalent concentration of the selected LEL gas. The user
can also modify this relative correction factor to increase or
decrease the gas reading. This allows the users to create a
custom factor for a specific gas or mixture of gases.
Note
: No correction factors are built in for the VOL sensor,
but selecting the measurement gas type in this mode ensures
switching between LEL and VOL at the correct volume %
concentration equivalent to 100% LEL. For VOL
measurements the calibration and measurement gas must be
the same, and the factor is always 1.0.
1. “Change LEL Gas Selection?” is the fourth sub-menu
item in Table 4.7
2. Press
[Y/+]
key. If an LEL sensor is installed and
enabled, or a combination LEL/VOL sensor is installed
and the sensor is set to LEL mode, the display shows:
LEL Gas = ?
methane
If the unit is in VOL mode, the display shows “VOL gas =
?… Methane…”. If no LEL/VOL sensor is installed, the
message “No LEL installed” will be displayed and the
unit returns to the first sub-menu.
3. If there is no change in the LEL/VOL measurement gas,
press
[Y/+]
to accept the current gas and
skip to Step 6.
