Oroboros Instruments O2k-Core, Руководство пользователя

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MiPNet19.18 B: OroboPOS service 20
OROBOROS INSTRUMENTS
O2k – tested and trusted
2.3. Clean the electrical connection
Unscrew the POS head and inspect both sides of the electrical connection
(gold pin and threads). Remove any contamination such as salt crystals,
grease and moisture with a fine paper cloth. If necessary, wash with
distilled water and then with pure alcohol. Apply
Pen-Contact Oil from the
OroboPOS-Service Kit to the connections only if necessary. Before screwing
the POS head onto the
OroboPOS-Connector for membrane application,
clean the POS connector of moisture and any other contamination
(particularly any salt crystals from the electrolyte). Similarly, clean the plug
of the electrical cable connecting to the O2k-Main Unit.
3. Membrane mounting
The POS head is screwed onto the blue OroboPOS-Connector . Check the O-
ring on the POS head to ensure that its surface is smooth and intact. In
exceptional cases, apply a tiny amount of grease to the O-ring of the
sensor head.
Use KCl solution as electrolyte (1 mol∙dm
-3
; 74.56 g potassium
chloride per litre, in distilled water) provided in the OroboPOS-Service Kit.
Add distilled water to the
electrolyte powder up to the 10 ml mark.
Alternatively, dissolve 1.49 g KCl in distilled water with a total volume of 20
ml. Store at room temperature or 4 °C in a closed vial. To prevent the
formation of gas bubbles in the electrolyte, heat the electrolyte solution by
shaking the electrolyte vial in hot water (40-70 °C) before membrane
mounting.
POS membranes are contained in small boxes in the OroboPOS-Service
Kit. They are fully transparent. Each membrane is separated by a non-
transparent white paper sheet. Do not add the paper to the oxygen sensor.
Separate a membrane from the stack of paper sheets and membranes,
carefully avoiding any mechanical damage of the transparent membrane.
Do not touch the central area of the membrane with your fingers.
The black OroboPOS-Mounting Tool consists of two parts, (i) the
membrane guide (larger diameter) and (ii) membrane ring holder with O-
ring. Wash off any electrolyte and salt crystals with distilled water.
1 Position a new membrane into the membrane guide using the pair
of forceps . 2 Fix the OroboPOS-Membrane Ring (which seales the
membrane against the sensor body) to the membrane ring holder . Fill
the POS head with electrolyte. 3 Slide the membrane guide downwards
across the POS head while pushing the lower ring (arrow) of the blue
OroboPOS-Connector strongly downwards. By releasing this ring, the
membrane guide is fixed to the POS connector . 4 To slide the OroboPOS-
Membrane Ring over the POS head, slide the membrane ring holder into
the membrane guide, and press firmly down in a single movement to the
final position.

Clip B5