ABB SCK - Page 23

42/23-81 EN Rev. 4 System Manual SCK Gas Sampling System 23
Monitoring device Purpose Function
Reed contact shutter
open (only for automat-
ic shutter actuation)
 Protects the gas sam-
pling probe against
damage
 Prevents insertion of
the gas sampling
probe if the shutter is
not fully open
Sample gas line tem-
perature measurement
 Protects the sample
gas line against con-
densation build-up in-
side
 Prevents insertion of
the gas sampling
probe if the sample
gas line is not fully
heated up
Cable drag chain tem-
perature measurement
 Protects the cable drag
chain against conden-
sation build-up inside
 Prevents insertion of
the gas sampling
probe if the sample
gas line is not fully
heated up
The following monitoring devices belong to the probe H only:
Monitoring device Purpose Function
Reed contact plunger
extended
 Protects the plunger
against overheating
 Triggers the retraction
program if end posi-
tion is not reached
Reed contact plunger
retracted
 Protects the plunger
against overheating
 Triggers the retraction
program if end posi-
tion is not reached
Only for probe H