ELTRA CS-2000, Service Manual

Page: 47 / 160

Faults
47
–
Clean the solenoid valve, see chapter
“
Cleaning solenoid valves
”.
If the fault is still present, then:
–
Switch off the power, (set the power switch to position 0).
–
Pull out the socket (2) from the coil and measure the coil resistance. 3.3K is normal.
Outflow valve does not close:
Fig. 34: Outflow valve
Open the left-side panel of the analyzer. When the furnace is closed (the lift is up), no oxygen
should be flowing out of the lower (free) opening of the valve (1) (in the direction of the arrow).
This can be checked by putting your finger under the lower opening of the valve. If the valve
does not close correctly, you will feel a strong
oxygen pressure. The power supply to the valve ( V1 ) should be 0 Volt. If this is the case then
the outflow valve ( V1 ) should be cleaned see chapter
“
Cleaning solenoid valves
”.
The voltage on the outflow valve is constantly at 24 V:
–
Switch off the analyzer, exit the software and restart.
Other faults:
–
The screw for the upper furnace cushioning is too tight, see chapter
“Pneumatics”
.
–
The pressure switch does not close, see chapter
“Pressure switch”
.
–
The furnace closes too slowly, adjust according to chapter
“Pneumatics”
.
–
The furnace does not close: see chapter
“The induction furnace does not close”
.
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3.16 Waiting for stability message
Pos : 3. 33 /0010 ELTR A/ 0015 s ervic e_ins truc tions/C S-2000_s er vice/ 05Faults _C S-2000/ 0590 M odul Waiting for s tabilit y @ 9\ mod_1425540207023_9.doc x @ 74297 @ @ 1
When this message appears in the status window after starting analysis, it means that the base
lines are not within the "deviation-limit", set in the "configuration" window. A usual value is 10mV
and the set time is 20 seconds. By setting the voltage and the time, both criteria for base line
stability are considered, the noise and the drift.
Reasons for instability:
1. Too low deviation value
One reason for the above message is that the deviation value in the configuration window is too
low, so that a higher value should be entered. The levels of noise of all cells are not necessarily
identical. Longer cells have normally higher noise than shorter ones and the sensors
themselves have noise level deviations between exemplars. The deviation can be increased in
the Configuration window, Base lines. Usual value is are 10mV / 20 seconds.