OxyMax W COS 41
3 Installation
Hauser
11
"
Caution!
For pressures > atmospheric pressure
•
Pressurisation and work at a constant overpressure up to 10 bar poses no problems.
•
Rapid pressure loss at the measuring point leads to air degassing in the electrolyte
due to the sudden reductions in solubility. This could lead to a swelling of the sensor
membrane.
Avoid this problem by keeping up the pressure on the sensor. In the case of rapid
pressure loss e.g. during maintenance work on the pipeline close all the valves
(manual mode: manually actuated valves, automatic mode: solenoid valves, see Fig.
3.12, Pos. 4 and 7) of the assembly.
3.4
Sensor design and functional description
The figure on the next page shows an enlarged side view (Fig. 3.14) and top view
(Fig. 3.15) of the sensor head.
3.4.1 Design
The sensor consists of the following
function units:
•
Sensor body
•
sensor head with gold cathode and
anode
•
Membrane cap with electrolyte filling
•
Protection basket
The electrical connection is either done by
a fixed cable (1) or by a TOP 68 plug-in
connection.
The threaded connections NPT ¾’’ (2) and
G 1 (3) are designed for installing the
sensor in an immersion or flow assembly.
The protection basket (5) is screwed on.
Alternatively to the protection basket, you
can use a spray head COR 3 (optional,
see "Accessories", page 22) for use in
immersed operation with cleaning func-
tion.
The membrane cap screwed onto the sen-
sor head is filled with electrolyte. The
screw connection seals it from the
medium.
The membrane which is in contact with the
medium is seated tightly in the membrane
cap (pretensioned in the factory).
The gold cathode (6), anode (Ag/AgBr, 9)
and an internal temperature sensor are
located inside the sensor head.
Fig. 3.13: Sensor design COS 41
1
Sensor cable
2
Threaded connection NPT ¾
3
Threaded connection G 1
4
Sensor body
5
Protection basket
6
Gold cathode
7
Membrane
8
Electrolyte
9
Anode
1
3
4
5
6
7
8
9
2
C07-COS41xxx-03-05-07-xx-001.EPS
Summary of Contents for OxyMax W COS 31
Page 2: ......
