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MAN0530 Issue 15 - 07/17
2104M0506
where:
Int(lel.m)
= Integrated LEL.m reading output by Searchline Excel in LEL.m.
xl
L
= Length of cell in metres.
cell
Conc
= Gas concentration in %v/v.
gas
LEL
= Lower Explosion Limit of the gas in %v/v.
gas
The test gas must be the same as the test gas used during the factory calibration of the
Searchline Excel unit and ideally the concentration should be between 2 and 5 LEL.m and
never below 1 LEL.m.
Note: Where a different test gas is used, the typical value for cross-sensitivity is not sufficiently
precise to enable valid calibration checks to be performed using the Gassing Cell,
however, response tests can be easily performed with the plastic Test Filters as described
in section 5.1.2.
Take the necessary precaution to ensure safety when dealing with these
The gassing cell supplied by Honeywell Analytics (Part No: 2104B2326) is 0.15m long and the
following table outlines the response expected when using this gassing cell:
Gas type
Methane
Ethane
Propane
Butane
Gas type
Ethylene
Propylene
Butadiene
4. MAINTENANCE
WARNING
high concentration gasses.
LEL
Concentration
of the gas
applied
5.0 %v/v
100 %v/v
3.0 %v/v
50 %v/v
2.0 %v/v
50 %v/v
1.5 %v/v
50 %v/v
LEL
Concentration
applied
2.7%
54%
2.0%
50%
2.1%
42%
WARNING
These gases are flammable and/or toxic.
Take appropriate precautions when handling.
Calculated
response with
0.15m gas cell.
3 LEL.m
2.5 LEL.m
3.75 LEL.m
5 LEL.m
Calculated
Response
3 LELm
3.75 LELm
3 LELm
60
Searchline Excel
4-20mA output
13.6mA
12mA
16mA
20mA
4-20mA output
13.6mA
16mA
13.6mA
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