5
2.3 Test equipment for customer service
1 siphon, water gauge 100 cm, inside diameter max. 8 mm
1 flow meter (variable-area type), measuring range 1.0 l/min.
to 10 l/min., measuring medium air, 20 °C, 1 bar absolute
1 absolute-pressure sensor (barometer) or adjusting barometer
set to absolute pressure. Measuring accuracy 5 Hpa (5 mbar)
1 gas-wash bottle (bead bottle)
1 digital multimeter (DMM)
1 oscilloscope, sensitivity 5mV/cm
1 thermometer with surface probe
1 P100 or P200 or P140 for engine-speed measurement
1 DC calibrator, 0 to 15 mV
1 data terminal (pocket keypad)
1 measured-value printer (integrated or connected externally via
serial interface)
Viton hose to test-gas connection (do not use any other type of
hose material)
Compressed air for cleaning test-gas probe and hose
2.4 Test gases for customer service
(with manufacturer's certificate)
In order to save on bottles of test-gas, mixed gases are sometimes
recommended.
No.1: 14 % CO
2
Accuracy of analysis ± 1 %
No.2: 16.000 ppm C
3
H
8
(propane)*)Accuracy of analysis ± 1 %
No.3: 9 % CO Accuracy of analysis ± 1 %
No.4: 5 % CO + 7.5 % CO
2
+
2.000 ppm C
3
H
8
(propane)*) Accuracy of analysis ± 1 %
No.5: 2 % CO +
3.800 ppm C
3
H
8
(propane)*) Accuracy of analysis ± 1 %
No.6: 8.000 ppm C
3
H
8
(propane)*) +
1 % CO Accuracy of analysis ± 1 %
In some countries, A and B are used for the calibration of test
gases in accordance with OIML Directive R99. These gases may
also be used for the purpose of fine-tuning. In this case, gases no.
1 and 4 need not be used.
A 2.000 ppm C
3
H
8
(propane)*) Accuracy of analysis ± 1 %
3.5 % vol. CO Accuracy of analysis ± 1 %
14 % CO
2
Accuracy of analysis ± 1 %
B 200 ppm C
3
H
8
(propane)*) Accuracy of analysis ± 1 %
0.5 % vol. CO Accuracy of analysis ± 1 %
6 % CO
2
Accuracy of analysis ± 1 %
*) The exhaust-gas analyzer is fine-tuned regularly with propane
(instead of hexane) for practical reasons. During fine-tuning,
the exhaust-gas analyzer is informed of the concentration of the
test gas in "ppm propane". The exhaust-gas analyzer auto-
matically takes account of the necessary "propane factor".
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