Temperature Sensor; Maintenance; Trouble-Shooting; Disposal - Mettler Toledo InPro3200 Manual De Instrucciones

InPro 3200 (SG) pH electrode

5.3 Temperature sensor

The integrated Pt 100 / 1000 temperature sensor
is primarily intended for automatic temperature
compensation of the pH signal during calibration and
normal operation, and not for the accurate indication or
control of the process temperature.
6

Maintenance

1. Carefully rinse the sensor tip and diaphragm with
deionized 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 moisture. If necessary, clean well with deionized
water or alcohol, and afterwards dry carefully.
7

Trouble-shooting

At sluggish response time (e.g. after a long and dry
storage period), reactivation of the pH sensitive glass
may be necessary. Dip the pH sensitive glass (but no
further sensor parts!) into Reconditioning (HF) Solution
(article no. 51 319 001) for 5 min. Afterwards, rinse well
with deionized water and let sensor tip and diaphragm
soak in reference electrolyte for minimum 12 hours.
Rapidly increased resistance of reference electrode
and/or drift could be signs of protein precipitation. Use
Cleaning Solution Pepsin / HCl (article no. 51 340 068)
to remove such precipitation. At repeated problems of
this type, consider switching to sensors with Friscolyt™
based gel electrolyte.
8

Disposal

If no relative official regulations are in force, used or
defective InPro 3200 sensors and the packaging can be
disposed of as ordinary household waste.
9

Guarantee

On manufacturing defects, 12 months after delivery.
© 03 / 16 Mettler-Toledo GmbH
Printed in Switzerland
InPro 3200 (SG) pH electrode
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