ABB SCK - Page 174

174 Operating instruction SCK Gas Sampling System OI/SCK-EN Rev. E
How to check the sample gas paths up to the sample gas pump:
Step
Procedure
1
Switch service switch to ON position (see Operating the service
switch on page 161), press EMERGENCY STOP switch and allow
gas sampling system to cool down.
WARNING! Risk of burning in the event of contact with compo-
nents that are still hot. Do not touch components until they
have cooled down to below 50 °C.
2
Detach probe-side connection of sample gas path and seal.
3
Detach analyzer -side connection and fit a tee with shut-off
valve.
4
Connect a U-tube manometer half filled with water to the open
outlet of the tee.
5
Blow nitrogen or air through the shut-off valve to a positive
pressure of 100
hPa (= 1000 mm water column).
6
Close the shut-off valve. Pressure should not change noticeably
within one minute (pressure drop < 1 hPa). A greater pressure
drop indicates a leak.
7
After fixing any leaks, refit the sample gas lines.
8
Turn service switch back to OFF position and insert gas sam-
pling probe again using the controller.
WARNING! Gas sampling probe moves into the kiln. Do not
stand in the area of travel of the gas sampling probe or probe
carriage until the probe is completely inserted into the kiln and
the warning lamps go out.
How to check the compressed-air system for leaks:
Step
Procedure
1
Switch service switch to ON position (see Operating the service
switch on page 161), press EMERGENCY STOP switch and allow
gas sampling system to cool down.
WARNING! Risk of burning in the event of contact with compo-
nents that are still hot. Do not touch components until they
have cooled down to below 50 °C.
2
Spray leak detection spray on:
 Screw connections and connectors
 Compressed-air tubes
Also listen for audible blowing-off sounds.
3
If you locate a leak: replace component and ensure adequate
sealing.
4
Turn service switch back to OFF position and insert probe
again using the controller.
WARNING! Probe moves into the kiln. Do not stand in the area
of travel of the probe or probe carriage until the probe is com-
pletely inserted into the kiln and the warning lamps go out.
Instructions:
checking sample gas
paths
Instructions:
checking the
compressed-air
system