Honeywell Searchline Excel User Manual

57
MAN0530 Issue 10 - 11/09 Searchline Excel
2104M0506
14) Removethetestlterfromthecowling.
15) Release the unit under test from INHIBIT by selecting the MAIN menu option.
16) Disconnect the SHC-1 Handheld from the unit being tested.
4.3 CALIBRATION CHECK USING THE GASSING CELL
The gassing cell is designed to allow easy calibration checking using a high concentration test
gasasopposedtothestandardplastictestlters.TheintegratedLEL.mreadingofthegas
concentration in the cell can be calculated using the following formula:
Int(lel.m)
xl
= L
cell
* (Conc
gas
/ LEL
gas
)
where:
Int(lel.m)
xl
= Integrated LEL.m reading output by Searchline Excel in LEL.m.
L
cell
= Length of cell in metres.
Conc
gas
= Gas concentration in %v/v.
LEL
gas
= Lower Explosion Limit of the gas in %v/v.
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 sufciently
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.
WARNING
Take the necessary precaution to ensure safety when dealing with these
high concentration gasses.
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 LEL Concentration Calculated 4-20mA output
of the gas applied response with
0.15m gas cell.
Methane 5.0 %v/v 100 %v/v 3 LEL.m 13.6mA
Ethane 3.0 %v/v 50 %v/v 2.5 LEL.m 12mA
Propane 2.0 %v/v 50 %v/v 3.75 LEL.m 16mA
Butane 1.5 %v/v 50 %v/v 5 LEL.m 20mA
4. MAINTENANCE

Honeywell Searchline Excel Specifications

General

Brand	Honeywell
Model	Searchline Excel
Category	Other
Language	English