GasTech Cannonball3, Reference Manual

Page: 56 / 79

55
LEL Component
Description Volume %
Methane (CH4)
50% LEL Methane 2.50
50% LEL Propane
Equivalent 1.62
50% LEL Pentane
Equivalent 1.25
Table 4.7.2.1 Percent LEL versus percent by volume of methane
for common Sperian Instrumentation calibration gas cylinders.
To change the calibration gas value setting from percentage of
LEL to percent by volume of methane or vice versa:
1. Enter the Calibration Menu as described above in section
4.7.1.
CALIBRATION MENU
GAS VALUES SPAN CAL
HISTORY O
2
ZERO CAL
FRESH AIR
REMINDER
EXIT
2. Use the navigation arrows to highlight GAS VALUES and
press the MODE button.
Depending on the existing calibration gas value setting, the
instrument will display the calibration value either as
percentage of LEL or as percent by volume of Methane (CH
4
).
CALIBRATION VALUE
LEL 50.0%
CO 50.0 PPM
SO
2
10.0 PPM
EXIT
CALIBRATION VALUE
CH
4
2.50 %/Vol
CO 50.0 PPM
SO
2
10.0 PPM
EXIT
3. Use the up and down navigation arrows to select LEL or
CH
4
and press the MODE button.
CALIBRATION VALUE
CH
4
2.50 %/Vol
CALIBRATION VALUE
LEL 50.0 %
4. The right and left navigation arrows may be used to move
back and forth between the calibration gas setting (LEL or
CH
4
) and the calibration gas concentration. To change the
calibration gas setting, press the left navigation arrow
once to highlight LEL or CH
4
.
CALIBRATION VALUE
CH
4
2.50 %/Vol
CALIBRATION VALUE
LEL 50.0 %
5. With LEL or CH
4
highlighted, the up and down navigation
arrows are used to change the setting. Once the desired
setting is shown, press the MODE button to save the
setting or move on to step 6 to adjust the concentration of
the calibration gas.