Replenishment Of Kcl Solution - YOKOGAWA OR8EFG User Manual

3.1.3

Replenishment of KCl Solution

When the KCl solution in the tank seems to be nearly exhausted while using a ORP Sensor with
general type reserve tank, replace the reserve tank with new one (provided separately as spare part).
Instead of tank replacement, when a KCl solution prepared using KCl powder is used for
replenishment, use 3.3 mol/L solution by dissolving 246 g of KCl powder in pure water to make
exactly one liter of solution. When pouring the solution into the tank, be careful that KCl solution
does not overflow from the vent holes of the tank.
When a ORP Sensor with a medium pressure reserve tank is used, replenish the KCl solution
when the KCl solution in the tank seems to be nearly exhausted. Carry out replenishment of KCl
solution as follows:
(1) Close the valves to shut off the (low of measured solution (see Figure 3.1) - first in the inlet
then the outlet valves in the flow-through type holder.
Inlet side
Stop Valve
Figure 3.1
(2) Remove the socket connector on the reserve tank and stop the air pressurizing the tank (see Figure 3.2).
Figure 3.2
(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.
30 to 40 mm
Figure 3.3
(5) Retighten the nut to fix the cap in position.
(6) Open the valve and let the measured solution flow through the holder.
Outlet side
Stop Valve
Process Piping of Flow-through Type Holder.
Socket type Connector
Press this part,
connector can be removed.
F3.2.ai
Socket Type Connector.
F3.3.ai
Maximum KCl Replenishment Level
< 3. Maintenance on operation >
F3.1.ai
IM 12C07J01-01E 8th Edition : Apr. 27, 2020-00
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