Operating Position; Sensor Set-Up / Initial Filling - Lovibond SD 310 Oxi Mode D'emploi

Affecting factors are:
- storage / operating temperature
- dirt particles from the measured water
- mechanical stress on sensor membrane
- storage of filled sensor in dry air
- continuous use in sensors with carbon dioxide concentrations

Operating position:

The correct operating position is with the sensor opening facing downwards.
Measurement accuracy:
The measurement accuracy can be affected by:
- insufficient flow
- water and sensor temperature must be in balance. Most accurate measurement if
calibration is done at measurement temperature.

7.2 Sensor set-up / Initial filling

The sensor is delivered unfilled to guarantee a good shelf life. Note that after the initial filling
the sensor needs a stabilization period of 2 hours. Appropriate gloves and eye protection
should be worn during the filling. Avoid skin contact with the electrolyte. In case of skin
contact wash the affected area thoroughly with water.
Material:
•
Sensor with membrane cap
•
Filling pipette
•
KOH electrolyte
•
Flat screwdriver
•
Paper towel
•
Suitable gloves
*)
•
Wash basin
Initial filling:
•
Check the membrane for damage
•
Unscrew the lock plug from the refill opening
•
Fill pipette with KOH
•
First fill membrane cap up to ¾, then tighten securely,
rinse any excess KOH
•
Then carefully and slowly fill the sensor,
then tap against the shaft and tilt the sensor to remove the air bubbles. The sensor holds a
maximum of approx. 5 ml.
•
Once no more air bubbles are released and the refill opening is filled, tighten with the lock plug.
•
Rinse any excess KOH
•
Turn sensor with membrane upwards: Are there air bubbles noticeable under the membrane?
If Yes: Then fill to the top.
•
Wait approx. 2 hours - then calibrate – the sensor evaluation should return a 100 % value.
suitable gloves: According to DIN EN 420, made from natural latex, natural rubber, butyl rubber,
*)
nitrile rubber, chloroprene rubber, fluorinated rubber.
SD 310_2 07/2018
Figure: Filling with pipette
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