Mettler Toledo InPro 3300 Instructions D'utilisation page 9

InPro 3300 Non-Glass pH Sensor
2. On unpacking, check the electrode for mechanical damage.
Report any signs of damage immediately to your METTLER
TOLEDO supplier.
3. Remove the watering cap and briefly rinse the electrode with
de-ionized water. An already used electrode should first be
cleaned by lightly scrubbing the sensing element with a
soft-bristled toothbrush and a mild soap solution, followed
by rinsing with de-ionized water.
4. Connect the electrode to the pH transmitter, using cable
VP6-ST/ISFET. Please refer to the wiring and terminal diagram
accompanying the cable.
5. Prior to calibration, soak the electrode in buffer pH 7.00 or
pH 4.01 for at least 10 minutes, with the electrode connected
to the transmitter.
6. Before putting the electrode into operation, carry out a zero
point calibration. Exact instructions for zero point calibration
are given in the instruction manual of the associated pH trans-
mitter.
5. Operation
5.1 Calibration of the electrode and the pH transmitter
A 2-point pH calibration is recommended e.g. using buffers
pH 7.00 and pH 4.01. Please refer to the instruction manu-
al of the pH transmitter for further details.
5.2 CIP-cleanability (Cleaning-In-Place)
A standard procedure for maintaining hygienic conditions
in food processing is Cleaning-In-Place (CIP). Periodic
flushing with hot caustic soda (NaOH) will however shorten
the lifetime of the electrode. We therefore recommend to
retract the electrode from the process and to clean it with
hot steam (sterilization procedure).
6. Maintenance
1. Carefully rinse the sensor tip and diaphragm with de-ionized
water after each production cycle. Under no circumstances
must measuring solution be allowed to dry on these parts!
2. When the sensor is not in operation, store it with sensor tip
and diaphragm well submerged into 9823/3M KCl or 9816/
Viscolyt™ electrolyte.
3. If the sensor is stored mounted in its housing, the same rule
as in 2) above applies, but the storage electrolyte has to be
slightly modified, with 2 parts of buffer solution pH 9.2 to 10
parts of electrolyte, this in order to avoid corrosion of housing
parts.
4. If a sensor is stored dry for a few days by mistake, let it soak
in the normal storage electrolyte for several hours before use.
5. Occasionally check the connector for possible traces of mois-
ture. If necessary, clean well with de-ionized water or alcohol,
and afterwards dry carefully.
6. The silicone O-ring (marked No. 4 in the drawing) is to be
replaced at least every six months or, if necessary, at a short-
er interval.
7. Trouble-shooting
For cleaning, lightly scrub the sensing element of the electrode
with a soft toothbrush and water to remove any possible resi-
dues. Use mild detergent if necessary. Possible protein precipi-
tation and blockage of the diaphragm can be treated with clean-
er 51 340 070.
a
Attention: H F-containing solutions will destroy the pH sen-
8. Disposal
If no official regulations are in force, used or defective electrodes
and the packaging can be disposed as ordinary household
waste.
9. Warranty
In the event of manufacturing faults, a warranty period of 12
months from date of production is granted.
InPro and Viscolyt are trademarks of the Mettler-Toledo Group.
InPro 3300
52 002 258
sitive element of the electrode.
© 02 / 16 Mettler-Toledo GmbH
Printed in Switzerland
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