ABB SCK - Page 21

OI/SCK
-EN Rev. E Operating instruction SCK Gas Sampling System 21
Monitoring device
Purpose
Function
Cooling water return
temperature meas-
urement

Protects the probe
against overheating

Triggers the retrac-
tion program if max-
imum temperature is
exceeded
 Locks follow-up
functions
Pressure switch
Emergency tank full
(optional)

Ensures adequate
compressed-air re-
serve

Triggers the retrac-
tion program if min-
imum input pressure
is not reached
Reed contact shutter
open (only for auto-
matic shutter actua-
tion)
 Protects the gas
sampling probe
against damage
 Prevents insertion of
the gas sampling
probe if the shutter is
not fully open
Sample gas line tem-
perature measure-
ment

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
temperature meas-
urement

Protects the cable
drag chain against
condensation 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 retrac-
tion program if end
position is not
reached
Reed contact plunger
retracted

Protects the plunger
against overheating

Triggers the retrac-
tion program if end
position is not
reached
Only for probe H