Installation And Commissioning; Operation; Calibration Of The Sensor And Ph Transmitter; Temperature Sensor - Mettler Toledo 3201-UPW Manual De Instrucciones

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16 pH Combination Electrode Type 3201-UPW / 3201 i-UPW
4

Installation and commissioning

1. On unpacking, check the sensor for possible
mechanical damage of the pH sensitive glass, the
ceramic reference junction / diaphragm, the shaft
and the VarioPin (VP) or ISM connector. Report any
damage immediately to your Mettler-Toledo Thornton
supplier.
2. Remove the watering cap and briefly rinse the sensor
with deionized water. Important: Carefully and
thoroughly remove the protective droplet of silicone
sealant on the reference junction / 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 for the relevant
housing in order to install the sensor correctly.
6. Connect the sensor to the pH preamp or transmitter,
using a cable with VarioPin (VP) or ISM connector.
Please refer to the wiring and terminal diagram
accompanying the cable.
5

Operation

5.1 Calibration of the sensor and pH transmitter

For 3201-UPW sensors, a 2-point calibration is
recommended. After removing the watering cap, the
sensor is dipped in succession into two different buffer
solutions with known pH reference values and the
transmitter is calibrated to these buffer values.

5.2 Temperature sensor

The integrated Pt 1000 temperature sensor is primarily
intended for automatic temperature compensation of the
pH signal during calibration and normal operation. For
accurate indication or control of the process temperature,
a further sensor temperature calibration may be
performed.
6

Maintenance

1. Carefully rinse the sensor tip and reference
junction / diaphragm with deionized water after
removal from the process. Under no circumstances
should measuring solution containing solids be
allowed to dry on these parts!
2. When the sensor is not in operation, store it with
sensor tip and reference junction / diaphragm well
submerged into 3M KCl.
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
3201-UPW / 3201 i-UPW
52 002 471 F
© 05 / 18 Mettler-Toledo GmbH
Printed in Switzerland