Operation; Start-Up And Polarizing - Mettler Toledo InPro 6850i Bedienungsanleitung

InPro 6850i / 6900i / 6950i O
5

Operation

Important! Before using the sensors for the first time,
the electrolyte must be filled in (see "Chapter 6.2").
5.1

Start-up and polarizing

Important! The protection cap must be removed be-
fore mounting the sensor in the process.
When the system is operated for the first time or if the
sensor has been disconnected from the voltage
source (transmitter or O
than 5 minutes, the sensor has to be polarized prior
to calibration by connecting it to the operating O
transmitter or to a sensor master. After 6 hours, the
sensor is fully polarized and ready for operation.
Attention: The InPro 6950i should never be
polarized at air!
During this time, it is recommended to keep the
protection cap filled with fresh conditioning solution
on the sensor (see "Section 7 – Storage"), especially
if the sensor is being polarized for longer than 6
hours.
A shorter polarization period is sufficient if the sensor
has been disconnected for only a few minutes. The
following table serves to establish the correct polar-
ization time in relation to the depolarization time.
Depolarization time
t depol [Min.]
30 > t
15 > t
1 Depolarization time: Time span in which the pola-
rization voltage is cut off from the sensor. This is
the case:
– during the time the cable is disconnected or no
transmitter or sensor master is connected
to the cable, or the transmitter has been
disconnected from the current supply.
– after changing the electrolyte or membrane
body. In this case at least 6 hrs of polarization
must follow.
2 Polarization time: Time span during which the
sensor is under a polarization voltage.
Important! Setting of the polarization voltage on the
transmitter for correct measurements:
– Standard applications InPro 6850 i: – 675 mV
© 02 / 09 Mettler-Toledo AG
Printed in Switzerland
t > 30
depol
> 15
depol
> 5
depol
t < 5
depol
Sensor 12 / 25 mm
2
sensor master) for longer
2
1
Minimum required
polarization time
360
6 t
depol
4 t
depol
2 t
depol
InPro 6850i, 6900i, 6950i
17
2
2
[Min.]
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