Maintenance; Maintenance Intervals; Servicing The Immersion Tube - Knick SensoGate WA 133 Series User Manual

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NOTICE: Shut Off Process Medium, Process Pressure, and Compressed Air!
!
Before starting maintenance work, you must separate the retractable fitting safely from the
process: Make sure that it is disconnected from all process media and process pressure.

Maintenance Intervals

Due to the differing process conditions (pressure, temperature, chemically aggressive media etc.),
we can only give recommendations for maintenance intervals.
The following maintenance intervals are generally recommended:
Maintenance interval
First inspection
after a few days/weeks
After 6 – 12 months
These maintenance intervals are rough recommendations.
1)

Servicing the Immersion Tube

High process pressures and high process temperatures can cause the immersion tube to shrink
(known creep tendency of PTFE). Remove the retractable fitting from the process to see if the
immersion tube has shrunk (figures show SERVICE position).
As delivered, the immersion tube fits flush
with the flange bushing (N).
Operations required
1)
Move the retractable fitting to the SERVICE position and
observe the outlet. If the retractable fitting is not tight,
process fluid will leak from the outlet hose.
Observe the leakage bore (see Overview of Retractable
Fitting). When there are deposits on the leakage bore or
compressed air is escaping, replace the process-wetted or
dynamically stressed gaskets.
Repeat the operations of the first inspection. When there
are deposits on the leakage bore or compressed air is
escaping, replace the process-wetted or dynamically
stressed gaskets.
N
The immersion tube may shrink by up to 2 mm.
If it has shrunk by more than 2 mm, you must
replace the immersion tube (see "Immersion
Tube" chapter).

Maintenance

SensoGate WA 133