33
Maintenance Intervals
SensoGate® WA 131 H
The following maintenance intervals are generally recommended:
Maintenance interval*
Operations required
First inspection after
a few weeks
Move the probe to the SERVICE position and observe
the outlet. If the sensor lock-gate is untight, process
fluid will leak from the outlet hose.
Observe the leakage holes (holes directly beneath the
coupling nut, see “Build-Up of the Sensor Lock-Gate”
on page 13). When there are deposits on these
leakage holes or compressed air is escaping, there
may be leakages in calibration chamber or the pneu-
matic system.
After 6 – 12 months
(after successful first inspection and
suitability of all materials used, this
time period may be extended.)
Repeat the measures of the first inspection.
When there are deposits on the leakage holes or
compressed air is escaping, replace the process-
wetted (dynamically stressed) gaskets.
After 10,000 – 20,000 probe travels
You should replace the process-wetted (dynamically
stressed) gaskets.
After approx. 2 years
Particularly if you use chemically aggressive cleaning
agents, you should check the rinse-wetted gaskets
and replace them if required.
After approx. 5 years
Servicing the pneumatic drive unit and relubricating
the gaskets.
*) These maintenance intervals are rough recommendations.
The actual intervals depend on the application of the sensor lock-gate.
As a result of highly variable process conditions (pressure, temperature, chemically aggressive
media etc.), general information on necessary maintenance intervals is difficult to provide. If
proven experience from similar points of measurement with regard to materials used and their
resistance unter process conditions is available, the maintenance intervals can be adjusted by the
customer. If previous experience is positive, parts of the first inspection may be omitted.
