Selecting Lel Gas Type - Honeywell MicroMAX Pro User & Maintenance Manual

Multi-gas monitors
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MAN-MAXPRO
REV. B.0.
6.2
The LEL sensor is designed to provide its highest sensitivity to
Methane, See Appendix A Specifications - Section (O)
General). For users detecting methane or natural gas, the
standard calibration methods, using methane, with the "SEL
LEL GAS TYPE" set to Methane, is acceptable. This is the
standard default setting.
For users that need to monitor for a gas on the list, other than
methane or natural gas, there are two options:
(1)
(2)
6. PROGRAMMING
Low alarm set points/Low alarm disable (except O2)
Calibration due date displayed or not during start-up
sequence, calibration due frequency
Language choice
TWA alarm on or off
Factory default settings
Calibration

SELECTING LEL GAS TYPE

For the highest possible accuracy, it is always better to
calibrate the instrument with the desired target gas (that
is, the gas being monitored) i.e. Pentane. This is done
by following the calibration procedure in Section 5.2
Calibration Procedure (when all calibration gases are in
a single canister) and leaving the "SEL LEL GAS TYPE"
setting at Methane.
If the target gas (let's use Pentane as an example) is not
available, acceptable results may be obtained by
entering the "SEL LEL GAS TYPE" function in the
supervisory mode, selecting "Pentane", and using the
procedure in Section 5.2 Calibration Procedure (when
all calibration gases are in a single canister) to do a
standard calibration with methane gas. This action
enables the instrument to indicate the correct LEL
reading when monitoring Pentane. See Appendix A
31

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