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30
CLP
OPERATOR’S MANUAL
#96-6294 • Revised 7/04
OPTIONAL DIGITAL ORP/PH
CONTROLLER - MODEL PH402
Sensor Maintenance
General: Before the sensor can be serviced, it should
be physically separated from the unit. The FU20 sensor
can be taken from its measuring position by following
the procedure described below.
Cleaning: Separate the sensor from the unit according
to the following procedure.
• Turn the sensor counterclockwise
• Remove the sensor
• Spray with water or detergent
• Use a soft brush to remove dirt
• Check the sensor visually for damages
• Calibrate the sensor
• Mount the sensor again
Remarks:
• Use teflon tape or paste on all threaded parts.
• Take care to avoid torsion of the cable by first turn-
ing it counterclockwise before tightening the pro-
cess connection.
• When the sensitivity of the sensor has decreased
or the response has slowed down, the electrode
needs cleaning.
• If cleaning with hot water is not sufficient, more
aggressive water based agents should be used.
Examples:
1.
Deposits of limes, hydroxides or carbonates can be
removed by immersing the electrode in a solution
containing diluted hydrochloric acid. Afterwards rinse
with water.
2.
Deposits of oil and fat can be removed with hot wa-
ter in conjunction with a detergent. When the results
are unsatisfactory a mild (carbonate based) abra-
sive can be used.
3.
Protein (alduminous) deposits should be removed
with a protein enzymatic solution. For instance a
solution containing 8.5 ml concentrated hydrochlo-
ric acid and 10 gram pepsin in 1 litre will do.
After cleaning the probe is reinserted into the process
by following the reverse procedure.