Operation; Start-Up And Polarizing - Mettler Toledo InPro 6800 Serie Bedienungsanleitung

InPro 6800 O
5

Operation

a
Attention! 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

a
Attention! The protective cap at the tip of the sensor must
be removed before putting the sensor into operation.
When the system is operated for the first time or if the
sensor has been disconnected from the voltage source
(transmitter or O
minutes, the sensor has to be polarized prior to cali-
bration by connecting it to the operating O
or to a sensor master. After 6 hours, the sensor is fully
polarized and ready for operation.
A shorter polarization period is sufficient if the sensor
has been disconnected for only a few minutes. The fol-
lowing table serves to establish the correct polarization
time in relation to the depolarization time.
Depolarization time
Depolarization time:
1)
Time span in which the polarization 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 transmit-
Polarization time:
2)
Time span during which the sensor is under a
polarization voltage.
a
Attention! Setting of the polarization voltage on the
transmitter for correct measurements:
– Standard applications (e.g. measurement in bio-
technology):
– Measurement of permanently low oxygen concen-
trations < 500 ppb in the presence of volatile acidic
components (e.g. carbon dioxide during measure-
ments in breweries): – 500 mV
h
Important! To ensure the supply of the correct polariza-
tion voltage the transmitter must be set accordingly.
© 02 / 2023 METTLER TOLEDO
Printed in Switzerland
Sensor 12/25 mm
2
2
t [Min.]
depol
t > 30
depol
30 > t > 15
depol
15 > t > 5
depol
t < 5
depol
ter or sensor master is connected to the cable
Sensor-Master) for longer than 5
Minimum required polar-
1)
ization time
– 675 mV
transmitter
2
[Min.]
2)
360
6 * t
depol
4 * t
depol
2 * t
depol
InPro 6800
52 200 953 C
21