MeshGuard LEL IR & CO2 IR User’s Guide
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After the countdown reaches 0, the LCD displays “dn,” for “done.” The reading should show 0 (zero).
Otherwise, repeat the zero calibration. (LEL reading is shown here.)
Note: To stop zero calibration before the countdown reaches 0, press any key. The LCD displays
“no” and advances to the next programming menu, Span calibration.
5.9.4. Span Calibration
“CAL” and “go” flash in alternation, and “SPAn” is shown. The instrument is now ready to perform
a span calibration.
To start calibration, press [Y/+]. The LCD displays “go.”
The instrument waits for 10 seconds so that you have time to connect the span gas. Connect the
calibration gas adapter to the MeshGuard LEL IR or MeshGuard CO2 IR, and connect the gas
cylinder to the calibration adapter. Start the flow of gas.
When the gas flow starts, the LCD displays “gAS” and the span concentration value. (LEL value is
shown here.)
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