ABB SCK - Page 217

OI/SCK
-EN Rev. E Operating instruction SCK Gas Sampling System 217
Observation
Possible causes
Measures
Unusual probe
movements
(probe rocks up
and down, sways
to the sides, jerky
travel)

Loose parts
 Severe soiling of rails

Have trained experts
find out the cause
Compressed-air
hose bursts or
compressed-air
pipe cracks

Pressure controller
defective
 Incorrect pressure
set on pressure con-
troller

Close gate valve in
pneumatic box, then
wait for all compressed-
air to blow out com-
pletely before approach-
ing
 Shut down gas sampling
system and secure
against start-up until the
cause has been fixed
Cooling-water
pipe bursts or
cracks
 Mechanical damage
to the pipe from out-
side
 Wait until all cooling
water has run out before
approaching
 Shut down gas sampling
system and secure
against start-up until the
cause has been fixed
 Do not begin repair work
until it has cooled down
Probe or heat
exchanger cracks
 Mechanical damage
and thermal stress
 Wait until all cooling
water has run out before
approaching
 Shut down gas sampling
system and secure
against start-up until the
cause has been fixed
 Do not begin repair work
until it has cooled down
Probe movement
blocked

Mechanical damage
 Incrustation

Press EMERGENCY STOP
switch before working
on the probe
 Remove blockage