Operation; Start-Up And Polarizing - Mettler Toledo InPro 6950 Série Instructions D'utilisation

InPro 6950 Series O
5

Operation

Important! Before using the sensors for the first time,
the electrolyte should be replaced (see "Chapter
6.2"). Due to possible adverse conditions during
transport and storage (e.g. airfreight; pressure and
temperature variations), the quality of the electrolyte
may become impaired. Poor electrolyte quality can
lead to erroneous measurement values.
5.1

Start-up and polarizing

Important! The watering cap must be removed before
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 min utes, 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.
During this time, it is recommended to keep the
watering cap filled with 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:
– change of electrolyte
– change of membrane body
– the time the cable is disconnected or no
transmitter or sensor master is connected
to the cable.
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: – 675 mV
© 02 / 17 Mettler-Toledo GmbH
Printed in Switzerland
Sensor 12 mm
2
t > 30
depol
> 15
depol
> 5
depol
t < 5
depol
sensor master) for longer
2
1
Minimum required
polarization time
360
6 t
depol
4 t
depol
2 t
depol
17
2
2
[Min.]
InPro 6950
52 206 137