Testing The Sensor Via A Transmitter - Mettler Toledo InPro 6950 Serie Bedienungsanleitung

InPro 6950 Series O
If the green LED lights up the current for air
measurement is with in the admissible range.
If the LED does not light up, you should check the
battery of the O
manual "Accessories"). If the battery is work-
ing, than there is probably a problem with your
sensor. You should change the electrolyte and/
or the membrane body of your sensor. If after a
membrane change the LED still does not light up,
this means that there is maybe something wrong
with the interior body of the sensor. You should
then change it (see "Section 6.2").
Important! The Sensor Check function only verifies
the correctness of the electrode current for air
measurement. In order to be absolutely sure of the
functionality of the sensor, the residual signal in an
oxygen free medium should also be controlled
(see "Section 6.1.3").
Important! The InPro 6950 sensor is not compati-
ble with the O
any other conventional polarization unit.
The 4-electrode system of the InPro 6950 sensor
can only be checked and/or polarized directly on
the transmitter or with the InPro 6950 O
master.

6.1.3 Testing the sensor via a transmitter

A periodic zero current measurement (no zero point
calibration!) is recommended for verification of prop-
er sensor function.
h
Note: At the time you carry out the zero current
measurement, the sensor must be polarized.
Zero current measurement can be done by using
zero ing gel (order no. 30 300 435) or nitrogen (N
or carbon dioxide (CO
purity of at least 99.995 %, alternatively in a sample
medium saturated with one of these gases.
After 2 minutes in an oxygen-free sample medium, the
reading on the transmitter should drop to
below 10 % of the reading in ambient air, and
within 10 minutes the value should have dropped
to below 1 %.
If the measured values are too high, this suggests a
depleted electrolyte or a defective membrane. In the
first instance replace the electrolyte, and in the sec-
ond case exchange both the membrane body and the
electrolyte accordingly.
If after such procedures the above mentioned values
are still not reached, replace the interior body. If this
doesn't solve the problem too send the sensor to your
local METTLER TOLEDO representative for inspection.
© 02 / 2023 METTLER TOLEDO
Printed in Switzerland
Sensor 12 mm
2
sensor master (see instruction
2
sensor master of the InPro 6900 or
2
) calibration gases with a
2
25
sensor
2
)
2
InPro 6950
52 206 137 F