Replacing Consumable Parts; Replacing Liquid Junction - YOKOGAWA OR8ERG Series User Manual

Figure 3.2
(7) Pour the KCl solution (or pure water) into the sensor until it overflows through the junction
hole. In doing this, do not leave any air pockets in the body.
(8) Restore the liquid junction removed in Step (3) above to its original position.
Calibrate the sensor using buffer solutions.
3.2

Replacing Consumable Parts

3.2.1

Replacing Liquid Junction

Even after washing the liquid junction, if normal measurement cannot be made, replace the liquid
junction.
When replacing the liquid junction, fill the sensor with KCl solution to just before the solution
overflows through the liquid junction mounting hole. Use a 3.3 mol/L KCl solution (a higher
concentration of KCl or KCl powder) for this application.
(1)
Face the sensor
tip up and
remove the
defective liquid
junction from the
sensor.
Figure 3.4
Pouring KCl Powder into Sensor
Syringe
(2)
Add KCl solution
to just before it
overflow through
the liquid junction
mounting hole.
Replacing Liquid Junction
< 3. Maintenance on operation >
(3)
Place a new
liquid junction in
position.
F3.4.ai
IM 12C04K01-01E
3-3
7th Edition : Feb.20,2020-00