ABB SCK - Adjusting Position Indicators: Probe Retractor

204 Operating instruction SCK Gas Sampling System OI/SCK-EN Rev. E
Probe retractor: Checking and, if necessary, adjusting the position
indicator (probe end position)
During operation, the probe position indicators may need to be readjusted.
This can be causes, for example, by loose fastening elements.
 every six months (or as required)
There are two inductive position indicators and one mechanical position
indicator in the probe retractor. The two inductive (1, 2) indicators are
mounted on the probe carriage and travel together with the probe, the me-
chanical position indicator (3) is permanently mounted on the retractor.
The above-mentioned position indicators signal to the controller that the gas
sampling probe has reached the respective position. The position indicators
given in the above illustration signal the following positions:
No.
Limit switch
Signal/position
1
Inductive position indi-
cator -B71
The probe is completely inserted
into the kiln.
2
Inductive position indi-
cator -B72
The probe is completely retracted.
3
Mechanical position
indicator -S72
The probe is retracted so far that it
has reached the mechanical limit of
the pneumatic motor.
Always take the following safety measures when performing this work:
 Wear the general protective equipment.
 Before commencing any work on the gas sampling system, turn the ser-
vice switch to ON and secure the service switch against unauthorized
switching (with a padlock).
 Additionally press the EMERGENCY STOP switch before working on the
retractor or probe.
 Do not enter the danger area around the retractor until it is at standstill
and the warning lamps and buzzer are off and the flap valve is closed.
 Do not perform the work until the gas sampling system has cooled
down.
Meaning
Maintenance interval
Illustration
Function of the
position indicators
Safety
measures