25
4.34.3
4.34.3
4.3
Function testingFunction testing
Function testingFunction testing
Function testing
Proceed as follows:
• screw the selected test-gas bottle onto the test set as far as it
will go (illustration 1/2 - item 2)
• connect the detector's probe nipple (item 3) to the test set hose
(illustration 1/2 - item 1)
• switch the detector on; the pump draws in
fresh airfresh air
fresh airfresh air
fresh air through the
test set (illustration 1/2 - item 4)
• use the needle valve (illustration 1/2 - item 5) to set the maximum
flow; it must be > 50 l/h (illustration 1/2 - item 6)
• wait until a stable zero point has been established (warm-up
time)
• press the release button (illustration 1/2 - item 3) on the test set
and adjust the flow to the fresh-air value (illustration 1/2 - item 6)
• hold it down until the indicated concentration has reached a
stable value
Admissible display values for methane CH
4
test gas:
• test gas 10 ppm : > 5 ppm
• test gas 100 ppm : 70 ... 140 ppm
• test gas 1,000 ppm : 800 ... 1,200 ppm
• test gas 1.00 vol.% : 0.80 ... 1.20 vol.%,
• test gas 2.20 vol.% : 2.00 ... 2.40 vol.% (45 - 55 %LEL)
• test gas 100 vol.% : 98 ... 102 vol.%
Admissible display values for propane C
3
H
8
test gas:
• test gas 1.00 vol.% : 0.90 ... 1.10 vol.% (55 - 64 %LEL)
• test gas 100 vol.% : 98 ... 102 vol.%
If display values are outside these tolerances the detector must be
recalibrated (section 5.0 Adjustment).
To Next Page
Loading...
