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10.5
Visual inspection of measuring bank of exhaust-gas analyzer module
Is the measuring bank damaged on the outside?
Are the glass connectors of the HC, CO and CO
Is the sheet-metal frame of the measuring bank bent?
Are analysis-chamber connectors broken off or damaged?
Are motherboard components (e.g. pressure gauge) broken off or damaged?
If any of the above is the case, the measuring bank must be replaced.
10.6
Electrical test of measuring bank of exhaust-gas analyzer module
After the supply voltage for the measuring bank (9.6 V to 16 V) has been switched on, the light-emitting diode on the motherboard must
first light up brightly and then halve its brightness after a few seconds.
The yellow LED does not light up when the voltage supply to the measuring bank is switched on:
There is a fault in the motherboard. Replace the measuring bank.
The LED remains bright; its brightness is not diminished:
Load valid software in the measuring bank.
Replace the measuring bank.
The LED lights up brightly at first, then halves its brightness, but then commences this cycle again after a short time:
The power supply to the measuring bank is not capable of supplying the high making current once the lamp has been switched on.
Check the power supply, ensure that higher making currents are possible.
Replace the measuring bank.
There is no communication between the measuring bank and a computer or higher-order system:
Ensure correct plug connections.
Replace the measuring bank.
10.7
Leak test of measuring bank
1.
Connect the measuring bank (1) as shown in the diagram.
2.
At the valve (3), generate a gauge pressure of approx. 100 cm water gauge.
3.
Close the valve.
4.
Observe the pressure drop in the U-tube gauge (2).
The drop in pressure may not exceed 1 cm water gauge per minute.
If the drop in pressure is greater than 1 cm/min, this indicates a leak in
the gas routing system of the measuring bank.
5.
Clean and check the measuring chambers as described in
ections 10.5-10.9.
72
detectors broken off or damaged?
2
3
1
2
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