Installation And Commissioning; Operation; Calibration Of The Sensor And Ph Transmitter; Sterilization Of Sensor - Mettler Toledo InPro3200 Manual De Instrucciones

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Installation and commissioning

1. On unpacking, check the sensor for possible
mechanical damage of the pH sensitive glass,
the diaphragm, the shaft and the VarioPin (VP)
connector. Report any damage immediately to your
METTLER TOLEDO supplier.
2. Remove the watering cap and briefly rinse the
sensor with deionized water. Carefully remove the
protection droplet of silicone on the diaphragm with
the enclosed knife, as shown on the green pictures
on the packing.
3. Again rinse the sensor well with deionized water. After
rinsing, the sensor should only be dabbed dry with
a tissue. Do not rub the pH sensitive glass, since
this can lead to electrostatic charging and sluggish
response times.
4. Carefully check the space behind the pH sensitive
glass for the presence of any air bubbles and remove
same by gently swinging the sensor in a vertical
plane.
5. Please refer to the instruction manual of the relative
housing in order to install the sensor correctly.
6. Connect the sensor to the pH transmitter, using a
cable with VarioPin (VP) connector. Please refer to
the wiring and terminal diagram accompanying the
cable.
7. For electrodes with Pt 100 temperature sensors,
3-wire technique is recommended in order to obtain
best measurement accuracy. Please refer to the
cable and transmitter instruction manuals for the
corresponding cable wire connections.
8. For InPro 3200 SG electrodes, with an additional Pt
ring for solution ground, connect the corresponding
blue wire in the VP-cable to your transmitter in
accordance with instructions in the connection
diagramm of VP-cable and / or in the transmitter
instruction manual. For ORP measurement (sep.
transmitter needed) connect solution ground with
ORP input.
5

Operation

5.1 Calibration of the sensor and pH transmitter

For InPro 3200 sensors, a 2-point calibration is
recommended. After removing the watering cap,
the sensor is dipped in succession into two different
buffer solutions with given pH reference values and the
transmitter is calibrated to these buffer values.

5.2 Sterilization of sensor

In the case of sterile processes, such as in fermenta-
tion applications, the sensors are sterilized prior to the
production cycle. Autoclaving of the whole fermenter / re-
actor unit including pH electrode is possible with this
sensor type. Sterilization can also be effected in-situ
by means of steam or superheated process medium in
contact with the lower sensor parts.
InPro 3200 (SG) pH electrode
52 001 518
InPro 3200 (SG) pH electrode
© 03 / 16 Mettler-Toledo GmbH
Printed in Switzerland