YOKOGAWA PH8ERP User Manual page 25

(1) Prepare a KCl solution available as an optional kit (part number: K9142UT), lf it is not yet
available, use instead KCl powder (about 12 g) and pure water (about 50 mL) and a clean
pipet (or a 20 mL syringe) to replenish the KCl solution.
KCl Powder
Syringe
Figure 3.1 KCl Solution Replenishing Kit (Part Number: K9142UT)
(2) Remove the sensor from its holder. Wipe off dirty areas on the sensor tip.
(3) Remove the liquid junction from the sensor. Leave the glass electrode mounted securely.
(4) Drain the KCl solution in the sensor through the liquid junction mounting hole.
(5) Wash the inside of the sensor. Pour about a 10 mL KCl solution (or pure Water) into the
sensor from the liquid junction mounting hole. Shake the sensor and then drain the solution
or pure water completely from the sensor.
(6) Pour about 10 or 12 grams of powder into the sensor, Use a bag of KCl powder when using
the optional KCl solution kit, Cut off the tip of the bag and follow Figure 3.2 below. If the KCl
powder has hardened, break it up into pieces. Then do the above.
Figure 3.2 Pouring KCl Powder into Sensor
(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. Maintenance on operation >
KCl Solution
F3.1.ai
IM 12B7K1-02E 11th Edition : Dec.14,2018-00
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