Safekeeping; Replacement Of The Sensor Membrane - Tintometer Lovibond SD 400 Oxi L Mode D'emploi

2. Carefully remove any type of dirt on the sensor membrane with a cloth, particularly if the
measurements are conducted in solutions containing chemicals. Ensure that the sensor
membrane is not damaged by scratches.

6.2 Safekeeping

6.3 Replacement of the sensor membrane

The sensor membrane must be replaced if:
• The membrane is damaged (chemically, mechanically)
• No stable measurements are obtained
• The service life of the membrane has elapsed
Even if no chemical or mechanical damages have occurred, the sensor membrane should be
replaced at least every 2 years in order to obtain precise measurement results (refer to "Ac-
cessories" for the item number).
Replacement process:
In order to replace the membrane cap, the old membrane cap is turned clockwise to loosen
it from the sensor.
Please check whether the O-ring on the membrane is correctly positioned and has not dete-
riorated (see below). The thread may be rubbed with some lubricating grease. If the O-ring
is damaged, it must also be replaced. It is included in the scope of delivery contents of the
new sensor cap.
Remove the new sensor membrane from the packaging and inspect the inside and outside
to determine whether it is absolutely dry and clean. Otherwise, use a lens cleaning cloth to
clean or dry it (see "Accessories").
The new sensor membrane is placed on the sensor tip and screwed in place anticlockwise.
Only hand-tighten the membrane; otherwise leaks or damage may occur. The sensor should
then be stored as described in 6.2 "Safekeeping". The Micro SD card supplied with the new
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The oxygen sensor must be stored in a moist environment in the sup-
plied storage flask when it is not being used for measurements.
The sensor can be stored in clean water or water-saturated air for
short storage periods of up to one week or between measurements.
For extended storage periods, the sensor should be stored in the stor-
age flask, which contains a moist sponge. In order to prevent soiling
the sponge, a hygienic working environment is recommended, as well
as the use of distilled water. It should be checked regularly to ensure
that the sponge does not dry out.
If the sensor is stored dry, measurement values may deviate with the
next measurement. Before measurement the sensor must be rehydrated
and recalibrated as necessary.
SD_400 Oxi L_4a 01/2021