Bases For Measurement; Oxygen Sensor; Explanation - VOLTCRAFT DO-400 Operating Manual

6 Bases for measurement

6.1 Oxygen sensor

6.1.1 Explanation

B-H86.0.21.DB214-1.0
The oxygen sensor is an active sensor. It consists of a platinum cathode, a lead anode
and potassium hydroxide (KOH) as an electrolyte. If oxygen is present, it is reduced
on the platinum cathode and the sensor delivers a signal. If no oxygen is present, no
signal is delivered. The anode is consumed by the oxygen measurement. The sensor
ages. Furthermore, the sensor loses water through the permeable membrane, in par-
ticular, when it is stored in dry air. Therefore, it should be checked and maintained
regularly and replaced as necessary.
DANGER
Potassium hydroxide!
The electrode contains potassium hydroxide. This causes burns. All contact with the
skin, clothing and eyes should be avoided. Nevertheless, should contact occur, take
the following measures.
– Eyes: Flush with flowing water for at least 15 minutes, seek medical attention!
– Skin: Wash with large amounts of water for several minutes!
– Clothing: Remove immediately!
– If swallowed: Drink large amounts of water, do not induce vomiting and seek med-
ical attention!
NOTE
Protective goggles must be worn for all of the following activities!
NOTE
Protective gloves must be worn for all of the following activities!
NOTE
Always store the oxygen sensor damp. It should always be stored in a storage bottle
filled with water or in a container filled with water. After storage for an extended period,
any potential deposit layers, such as algae, must be cleaned off of the membrane with
a soft paper towel prior to measurement.
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