User's Guide

MUNI User’s Guide
14
5.4.2.1 Multi-Gas Span Calibration
Select the proper Span Gas as described above and check the gas cylinder to ensure that the
concentrations match the Span Gas Value(s). If not, adjust the value(s) as described below.
Also, check the cylinder expiration date and do not use expired gas.
• Enter Configuration Mode, enter the CAL? sub-menu and scroll to MULTI SPAN?:
Config Mode → CAL? → → → MULTI SPAN?
• Press Left [+/OK] and the span gas concentrations are shown:
• Connect the calibration cap to the front face of the MUNI and start the span gas flow using
preferably a 0.3 - 0.5 LPM regulator (range 0.3 - 1.0 LPM).
• Press Left [+/OK] and wait for the 30-second count-down timer and “PASS” or “FAIL”
calibration result.
• To abort, press Right [ /↓] at any time during the count-down.
• Turn off the gas supply, remove the calibration cap and exit the CAL? menu.
• Oxygen Sensor parameters during Multi-Gas Span Calibration:
•
Span is any concentration 0-30% other than 20.9% (Air Cal is used to set 20.9%).
•
In the Global version, oxygen is default enabled and set at 18%.
•
In the China version, oxygen is default disabled and set a 0% for separate Single Span.
NOTE: If the sensor calibration fails, try again. If calibration fails again, turn off the power and
replace the sensor. WARNING! Do not replace sensors in hazardous locations!
Cal Gas In
n
Cal Cap
Cal Gas
Cylinder
(Global Version)
(China Version)