Temperature Sensor; Maintenance; Trouble-Shooting; Disposal - Mettler Toledo InPro2000 Manual De Instrucciones

InPro 2000 (i) pH electrode
5.4 Temperature sensor
The integrated Pt 100 / 1000 temperature sensor is primari-
ly 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. Regularly check the applied housing overpressure
during operation, and re-adjust if required.
2. Regularly check the electrolyte level in the sensor.
When reaching the end of the bulbous shaft section
(reservoir), refill with the electrolyte indicated on the
sensor up to the indication line for max. level.
3. In the case of electrodes with electrolyte bridge, ref-
erence electrolyte is first filled into the outer chamber
(marked blue) up to the maximum level. The inner
chamber (red marking) is then filled to a level ap-
proximately 0.5 to 1.0 cm higher than that of the outer
chamber.
4. Carefully rinse the sensor tip and diaphragm(s) with
deionized water after each production cycle. Under no
circumstances must measuring solution be allowed to
dry on these parts!
5. When the sensor is not in operation, store it with sen-
sor tip and diaphragm well submerged into the same
reference electrolyte as inside the sensor.
6. If the sensor is stored mounted in its housing, the same
rule as in 4) above applies, but the storage electrolyte
has to be slightly modified, with 2 parts of buffer solu-
tion pH 9.2 to 10 parts of electrolyte, this in order to
avoid corrosion of housing parts.
7. 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.
8. 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 stor-
age period), reactivation of the pH sensitive glass may be
necessary. Dip the pH sensitive glass (but no further sen-
sor parts) into Reactivation (HF) Solution (article No. 51
319 053) 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™ / 9848
electrolyte, which counteracts protein precipitations.
8

Disposal

If no relative official regulations are in force, used or de-
fective InPro 2000 (i) 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 2000 (i) pH electrode
en
17
52 001 519