7
Maintenance and troubleshooting
User qualification: instructed user
2.2 ‘User qualification’ on page 10
The sensor is factory calibrated and does not
need to be recalibrated during commissioning.
7.1 Dismantling the sensor
WARNING!
Danger from hazardous substances!
Possible consequence: Fatal or very
serious injuries.
Please ensure when handling haz‐
ardous substances that you have read
the latest safety data sheets provided
by the manufacture of the hazardous
substance. The actions required are
described in the safety data sheet.
Check the safety data sheet regularly
and replace, if necessary, as the
hazard potential of a substance can be
re-evaluated at any time based on new
findings.
The system operator is responsible for
ensuring that these safety data sheets
are available and that they are kept up
to date, as well as for producing an
associated hazard assessment for the
workstations affected.
With operation in the flow: Before dismantling
the sensor, make sure that no process medium
can escape when removing it.
When operating with immersion fittings: Never
turn the sensor on the sensor head as this can
loosen the sensor cap and liquid can flow into
the interior of the sensor.
7.2 Replacing the sensor cap
Replace the sensor cap if there is a drift of the
measured value of > 10% per week in constant
process conditions or there is a fault current of
21.5 mA.
1.
With sensors used for fish farming, first
remove the protective cap forwards by
turning it clockwise.
This step is not needed with all other
versions.
Use rubber gloves to improve the grip if
the sensor cap is sitting very tightly on
the shaft and you cannot get a grip with
your fingers.
Do not touch and dirty the sensor’s
optical window when unscrewing.
Should this still happen, then use a soft
lint-free cloth to clean the optical
window.
2.
Unscrew the old sensor cap from the
shaft by turning it anti-clockwise.
3.
Replace the O-ring which seals the
sensor cap from the sensor shaft.
The scope of delivery of the spare
sensor cap includes a spare O-ring.
4.
Carefully screw the new sensor cap into
the sensor shaft.
Make sure that the gap between the
shaft and cap is closed to ensure that
the O-ring provides a sealing effect.
Maintenance and troubleshooting
22
