M2A Transmitter Operator’s Manual
45
Chapter 6: Gas Type Mode
Overview
This chapter describes how to use Gas Type Mode to select the M2A’s gas type. The gas type determines the
target gas and detection range. The combustible gas/CO
2
and toxic/oxygen M2As have a different terminal PCB
and run on different firmware. Your M2A will only have gas type choices available that it can support.
Gas Type Mode includes a 5-minute time-out feature. If you do not press a button for 5 minutes, the M2A
automatically returns to normal operation.
NOTE:
If the M2A enters normal operation because of a program time-out, it enters a warm-up period just as
it does when it is first turned on.
Selecting the Gas Type
1. While in normal operation or during the warm-up sequence, press and hold the UP/YES and DOWN/NO
buttons for five seconds. Release them when the following screen appears.
2. If you want to exit Gas Type Mode, press and release the DOWN/NO button. The display will indicate
NO
CHANGE
and the M2A will return to normal operation.
If you want to continue in Gas Type Mode, press and release the UP/YES button. The top display line will
indicate
GasType?
and the bottom display line will indicate the target gas choice.
3. Use the UP/YES or DOWN/NO button to scroll through the choices of target gas. Table 12 and Table 13
below list the choices of target gas for the M2A.
Table 12: Combustible Gas/CO
2
Gas Types
Gas Type
Choices
Detection Range
HC
0 - 100% LEL
iBUTANE
0 - 100% LEL
PROPANE
0 - 100% LEL
HEXANE
0 - 100% LEL
HYDROGEN
0 - 100% LEL
METHANE
0 - 100% Volume
METHANE
0 - 100% LEL
CO2
0 - 5,000 ppm
CO2
0 - 9,000 ppm
Select
GasType?
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