19
Installing a Liquid-Electrolyte Sensor
CAUTION!
In the case of inclined installation, the sensor must
be installed as described below to prevent elec-
trolyte from flowing out during operation of the
sensor lock-gate.
First, move the sensor lock-gate into SERVICE
position.
Remove the plug and turn the electrolyte filling
hole
(W)
towards the top to prevent electrolyte
from flowing out when the sensor is inclined.
Observe the installation instructions of the sensor
manufacturer.
You can use sensors with a length of 250 mm and a diameter of 12 mm, e.g. Knick SE551.
To ensure that the electrolyte flows from the reference electrode to the process medium, the air
pressure in the sensor pressure chamber must be 0.5 to 1 bar above that of the process medium.
Compressed-air for sensor pressure chamber is conected via connection nipple
(U)
(dia. 6 mm).
Check whether the sensor is damaged (glass broken?). Remove watering cap from the sensor tip
and rinse sensor with water.
W
E
R
S
J
F
U
W
Installing the Sensor
1) The sensor must only be installed in
SERVICE position
.
2) Loosen small coupling nut
(R)
– do not remove it.
3) Unscrew large coupling nut
(S)
completely and
pull the detached unit upwards.
4) Install sensor
(E)
.
5) Replace the unit you have detached in step 3.
First hand-tighten the large coupling nut
(S)
and
then the small coupling nut
(R)
.
6) Connect cable socket and cable. Hold the cable in
a loop and fix it using clamp
(J)
.
CAUTION!
The cable loop must be long enough
so that the cable does not impede the stroke
movement of the fitting.
7) Connect equipotential bonding cable to terminal
(F)
(if required).
