ABB SCK - Process Monitoring Devices

20 Operating instruction SCK Gas Sampling System OI/SCK-EN Rev. E
Process monitoring
The process is monitored by the following devices:
Monitoring device
Purpose
Function
Inductive position
indicator Probe in-
serted

Ensures that front
end position is
reached
 Monitoring of probe
travel time

Locks various follow-
up functions
 Triggers the retrac-
tion program if probe
travel time is exceed-
ed
Inductive position
indicator Probe re-
tracted

Ensures that rear end
position is reached
 Monitoring of probe
travel time

Locks various follow-
up functions
 Triggers the retrac-
tion program if probe
travel time is exceed-
ed
Mechanical position
indicator Probe re-
tracted

Ensures that rear end
position is reached
 Monitoring of probe
travel time
 Additional signaling
option for customer
error management

Locks various follow-
up functions
 Triggers the retrac-
tion program if probe
travel time is exceed-
ed
 Provides a mechani-
cal switching contact
for error manage-
ment
Cooling water flow
temperature meas-
urement
 Protects gas sam-
pling probe against
condensation build-
up inside
 Locks various follow-
up functions during
start-up
Cooling water pres-
sure measurement

Protects the gas
sampling probe
against overheating

Triggers the retrac-
tion program if min-
imum cooling water
pressure is not
reached
 Cooling-water circuit
leak monitoring
Cooling water flow
measurement

Protects the gas
sampling probe
against overheating
 Monitors the cooling
water pump for ade-
quate pump power

Triggers the retrac-
tion program if max-
imum cooling water
temperature is ex-
ceeded
 Cooling water pump
function check
Pressure switch Com-
pressed air
 Ensures adequate
central compressed-
air supply
 Triggers the retrac-
tion program if min-
imum input pressure
is not reached
Monitoring
devices