IM 12B7J1-01E
< 3. Maintenance on operation >
3-2
(2) Remove the socket connector on the reserve tank and stop the air pressurizing the tank
(see Figure 3.2).
F3.2.ai
Socket type Connector
Press this part,
connector can be removed.
Figure 3.2
Socket Type Connector.
(3) Remove the nut fixing the reserve tank cap and remove the cap.
(4) Refill the tank with 3.3 mol/l KCl solution (see Figure 3.3).
The maximum solution level 30 to 40 mm lower than the top.
F3.3.ai
30 to 40 mm
Figure 3.3
Maximum KCl Replenishment Level
(5) Retighten the nut to fix the cap in position.
(6) Open the valve and let the measured solution flow through the holder.
3.1.4
Cleaning Glass Electrode and Liquid Junction
Staining of a glass electrode or liquid junction can cause measurement errors. Therefore, if he
measured solutions tend to stain the electrode, the glass electrode and liquid junction must be
cleaned periodically - depending on the degree of staining. if the pH sensor is installed in a holder
with a cleaner, the sensor is continuously (for an ultrasonic cleaner) or intermittently (for a jet or
brush cleaner) cleaned automatically.
Because of this, sensor cleaning is not usually required. However, if the sensor characteristics
are affected by chemical staining, for example, when the sensor is used for pH measurement of a
highly alkaline solution, carry out acid washing.
To clean the glass electrode or liquid junction, proceed as follows:
● Stains due to suspended Solids, Sticky Materials, Microbes or the like
Using soft tissue paper, wipe the stains off the glass electrode or liquid junction. In addition,
clean off remaining stains by rinsing with water.
●
Stains due to Oily Materials
Wash off stains by submerging in a neutral detergent solution in a beaker, etc, (for from
several tens of minutes to several hours depending on the degree of staining).
12th Edition : Dec.14,2018-00
