MeshGuard User's Guide
The display counts down from 10 to 0.
After the countdown reaches 0, the LCD displays "dn," for "done." The reading should show 0 (zero). Otherwise,
repeat the zero calibration.
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.
5.4.4 Span Calibration
"CAL" and "go" flash in alternation, and "SPAn" is shown. The MeshGuard is now ready to perform a span
To start calibration, press [Y/+]. The LCD displays "go."
The MeshGuard waits for 10 seconds so that you have time to connect the calibration gas. Connect the calibration
gas adapter to the MeshGuard, and connect the gas cylinder to the adapter. Start the flow of gas.