Evaluation Unit AVL 4000
4-60 Service Manual
4.25.4 Diesel - Opacity Measuring Chamber Type A
Error diagnostics menu for opacity measuring chamber
Fig. 4-7
Amplification (selenium cell)
• With the AMPL button, select the required amplification factor (HIGH or LOW).
Lamp status
Here you can switch the lamps on and off individually.
Opacity signal
− If the sum voltage (of lamps A, B) > 5 V, the selenium cell is already saturated -
lamps are too bright.
− If the selenium voltage (lamps OFF) > 0.2 V, there must either be a fault in the
selenium cell (or selenium board) or the photo-element is not closing properly
(causing incidence of ambient light).
SIGNAL OPACITY GAIN LAMP
2.685 V LOW A
VALVE VOLTAGE POSITION
1.86 V CALIBRATION
TEMPERATURE
MEAS. CHAMBER INLET MEAS. HEAD SYSTEM
101° C 85° C 20° C 25° C
LINEARITY DATE TIME
0.5 % 30/01/99 16:30
Opacity signal
(depending on lamps,
selenium cell and
gain setting)
Change the set gain
with AMPL
Lamp status
change with LAMP
(lamp A, B, A/B, off)
Valve position
change with VALVE
Measured temperatures
System time
Silicon Serial Number
(Mainboard)
Linearity
Start linearity check with LIN
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