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6.2.2 Dismantling the Flowcell for Cleaning and
Wiper Maintenance – Figs 6.1 and 6.2
Caution. The emitter and receiver modules
contain precision optical components and must be
handled accordingly. In particular, the emitter contains all
of the power supply, voltage control and lamp components
and is quite heavy. Do not support on the wires entering
the enclosure.
Always switch off the power to the instrument before
.
starting any service work
Warning. This instrument uses a high intensity
light source which emits UV radiation and must NOT be
viewed with the naked eye. Under normal operating
conditions it is not possible to see the light source, but if
the sensor is dismantled with the power applied, it may be
possible to expose the eyes to the strobe flash.
Perform a manual clean (see Section 5.2)
1
to ensure that the wiper blade is in
the 'parked' position.
Unscrew the collar and
carefully withdraw the
module.
Unscrew the collar and
carefully withdraw
the module.
Clean the inside of the flow chamber and other
5
assemblies thoroughly using mild detergent and
rinse with de–ionized water.
Inspect the wiper blade for wear or damage and
6
fit a new one if necessary, ensuring that it is
fitted in the 'parked' position.
Reassemble emitter and receiver modules using
7
new seals ensuring that the modules locate in the
keyways before tightening the collars.
Wiper
Unit
4
Optical
Receiver
3
Inlet/Isolating
Valve
Fig. 6.1 Low Range Sensor – Dismantling the Flowcell for Cleaning
✶
Important Notes.
•
Ensure that O-rings are removed with the screw
collars; it is possible for these seals to be left inside the
flowcell.
•
During the cleaning procedure, support the modules to
remove any strain from the cables.
•
Either grub screw pins or pegs ensure that the
modules locate in only one position.
•
The emitter module is heavier than the receiver, so
extra support is needed.
Caution. Care must be taken while handling the
emitter module and, for safety reasons, it must NEVER be
operated while outside the measurement cell.
Optical
Emitter
Unscrew the collar and carefully
2
withdraw the module.
Flow-chamber
Drain
Valve
Locating Peg
Keyway
Seal
6 MAINTENANCE...
Flow Chamber as
Viewed from Above
(Not to Scale)
Wiper in
'parked'
Position
Wiper
Blade
(parked
position)
– see inset
Seal
Before fitting the wiper module, apply power
8
to the sensor and perform a manual clean
to ensure that the blade has been fitted
correctly and is orientated as shown above
when in the park position. Fit module in
flowcell as detailed in step 7.
Locating
Peg
keyway
19
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