OXYGAS P-500 USER HANDBOOK
14
Volume Gas, 0 to 100 %
This range displays the total volume of a specific flammable
gas with respect to air. The calibration gas is shown on the
service label and for the purpose of this handbook is assumed
to be methane. Instruments calibrated for methane in air
should only be used for measuring such mixtures. To change
the calibration gas, e.g. from methane to propane, the
instrument must be recalibrated by suitably trained personnel.
On the Volume Gas range the instrument range is displayed
in the top right corner of the LCD as GAS. The digital display
resolves the signal to 1% GAS with the analogue bar graph
following in steps of 4%. Figure 2.2 shows the Volume Gas
display. The detection principle for the Volume Gas range is
thermal conductivity.
Figure 2.2 Volume Gas Range
Oxygen, 0 – 25%
This range displays the percentage Oxygen content of the
sample. The instrument range is displayed in the top right
corner of the display as % O
2
. From 0 to 21% O
2
the digital
display resolves to 0.1% O
2
. From 21 to 25% O
2
the digital
display resolves to 1% O
2
. The analogue bar graph follows in
4% steps.
The gas level is determined using an electrochemical cell,
which like toxic sensors is sensitive to pressure transients.
The oxygen cell has an expected life of two years.
Summary of Contents for Oxygas 500
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