Change Lel Span Gas - Rae QRAE PLUS PGM-2000 Operation & Maintenance Manual

4.3.5. Change LEL Span Gas

This function allows selection of the gas to be used for span
calibration of the LEL sensor. The correction factor for the
measurement gas (Appendix B) is automatically divided by the
correction factor for the span gas selected here, to obtain a new
factor for the combination of gases. The new factor will be
applied to the readings to display a true concentration.
1. "Change LEL Span Gas?" is the next sub-menu item in the
Calibrate/Select Gas Menu.
2. Press the [Y/+] key. If the combination LEL/VOL sensor is
installed and the sensor is set to "LEL mode", the display
shows:
Otherwise, the message "No LEL selected" will appear.
3. If the user does not want to change the LEL span gas,
press the [Y/+] key to accept the current selection and exit
this sub-menu.
4. If the user wants to select a different LEL span gas, press
the [N/-] key. Then use the [Y/+] or [N/-] key to scroll
through a list of gas names until a desired gas name
appears in the Display, then press the [MODE] key to
select the new gas name.
5. The display now shows "Save?" To confirm the new gas
selection, press the [Y/+] key to accept the change. Press
the [N/-] key or [MODE] key to discard the change and
return to the first display.
PROGRAMMING
LEL span =?
Methane
4-13