130130
t r o u b l e s h o o t i n g
Sample probe/sensor module obstructions
To remove a persistent flow obstruction, or as preventive maintenance,
perform the following steps.
•
Remove the electrodes from the sensor module. Refer
to Replace Components/Electrodes in Operating the
Analyzer.
•
Install the test block from the troubleshooting kit into the
sensor module. Release the compression plate.
•
Disconnect the pump tubing from the bottom of the sensor
module.
•
Lift the sampler to the syringe mode position.
•
Attach the large tubing segment to the syringe from the
troubleshooting kit. Fill the syringe with a 10% bleach
(0.4-0.6% NaClO) solution.
•
Connect the tubing segment to the bottom of the sensor
module.
•
Hold a container below the sampler.
•
Flush the flow path by gently pushing on the syringe.
•
Allow the bleach to remain in the flow path for 2 minutes.
•
If failure continues, remove the pump tube from the
valve module and loosen the pump so that it is attached
only to the Sensor Module and not stretched around
the pump. Remove the electrodes and replace with the
test block. Take a syringe filled with water and attach
with small tubing segment to the sampler in the syringe
mode. Gently press on the plunger of the syringe. Water
should flow from the pump tube.
•
Successful flow with the test block installed indicates
poor electrode alignment poor sealing, or an electrode
obstruction.
•
Examine the electrodes for worn or cracked O-rings.
•
Replace O-rings if necessary.
•
If an elecrode appears to be obstructed, replace that
electrode.
•
DO NOT attempt to remove an obstruction from an
electrode.
•
If you cannot push fluid through the flow path with
the test block installed, there is an obstruction in the
bubble detector. Placing a warm, damp paper towel
at its outlet for a period of time usually loosens mate-
rial blocking the flow path. It can then be flushed out.
Remove the paper towelling, resintall the test block
and again attemp to purge warm water through the
Sensor Module.
•
If ther water purge is successful, reinstall the electrodes
and test. Otherwise the Sensor Module will reqiure
service or replacement.
•
Reassemble the analyzer and perform DAILY
CLEANER before calibration.
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