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MAN0530 Issue 10 - 11/09
2104M0506
The procedures for using these functional test filters on Mod state 7 or higher Excel units are
detailed as follows:-
1)
Ensure the area is free from gas.
2)
Connect the SHC-1 Handheld Interrogator to the unit to be tested.
3)
Select DISPLAY from the Calibration menu.
4)
For new units, refer to supplied test certificate for factory response to test filter
recommended.
5)
For other units, slide a suitable functional test filter (see tables below) into the cowling
at the front of the receiver.
Receiver Gas Calibration
Methane
Ethane
Propane
Butane
Pentane
Hexane
Ethylene
Propylene
Butadiene
Methanol
Ethanol
6)
If this is the first time that the unit has been tested with this particular test filter, record
the gas reading that is produced. This reading should be used to verify correct operation
in the future.
7)
If this is not the first time that the unit has been tested with this particular filter, note the
gas reading it produces and compare it to the original value recorded for this unit when
tested with this filter. Provided that the reading is within ±0.5 LEL.m of the original value,
the unit is working correctly. If the unit is working correctly, proceed to step 15.
8)
If the gas reading is not within the expected range it is possible that the unit needs
cleaning or re-zeroing.
9)
Remove the test filter from the cowling.
10)
Using a damp, lint-free cloth, clean the windows of the transmitter and the receiver.
11)
Using the SHC-1 in CALIBRATE menu, re-zero the unit.
12)
Re-insert the chosen test filter into the cowling in front of the receiver.
13)
Verify that the reading produced by the test filter is now within ±0.5 LEL.m of the reading
originally obtained with this filter. If the gas reading is still not within the expected range,
check the system alignment (see section 3 of the Excel manual, 2104M0506) and repeat
the test in step 7.
4. MAINTENANCE
Low Test Filter
Response
C or D
0.5 – 1.1 LEL.m
C or D
0.6 – 1.3 LEL.m
B or C
0.5 – 1.2 LEL.m
B or C
0.6– 1.4 LEL.m
A
0.6 – 1.1 LEL.m
B or C
0.6 – 1.5 LEL.m
B or C
0.5 – 1.3 LEL.m
A
0.5 – 1.0 LEL.m
A
0.5 – 1.0 LEL.m
D
0.5 – 0.9 LEL.m
B or C
0.6 – 1.4 LEL.m
56
High Test Filter
Response
F
1.5 – 2.8 LEL.m
F
1.5 – 2.7 LEL.m
F
1.6 – 2.9 LEL.m
E
1.4 – 2.6 LEL.m
D
1.2 – 2.2 LEL.m
E
1.4 – 2.7 LEL.m
F
1.8 – 3.4 LEL.m
D
1.0 – 1.9 LEL.m
D
1.0 – 1.9 LEL.m
E
1.0 – 1.9 LEL.m
E
1.5 – 2.8 LEL.m
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