YOKOGAWA PH450G

<3. Piping and Wiring>
3-2
IM 12B07W01-04EN 1st Edition : Nov 11, 2016-00
3.1.1 Line for Connecting Air Source
Air with a pressure of 300 to 950 kPa (3 to 9.5 kg/cm
2
) is supplied to the operating unit of the
chemical cleaning system. Use a steel or stainless steel line with an inner diameter greater than
6 mm to connect the air source to piping port “A” (air) in the control box.
Note : The piping port is Rc1/4 thread or 1/4 NPT female-thread (as specied when ordering).
The maximum air consumption is approximately 10 normal litter/min.
3.1.2 Line for Actuating Cylinder to Drive Sensor
Pneumatically (Upward)
This line is provided to allow the pH sensor to be withdrawn from the measured solution during
cleaning and then housed in the cleaning chamber. This line connects the holder (the piping
port labelled “J”) with the control box (piping port “C” [the lower section of the cylinder] ). Use the
tubing supplied with the system when connecting these ports.
3.1.3 Line for Actuating Cylinder to Drive Sensor
Pneumatically (Downward)
This line is provided to allow the pH sensor once housed in the cleaning chamber to be returned
to a measurement position after cleaning. This line connects the holder (the piping port labelled
“K”) with the control box (piping port “D” [the upper section of the cylinder]), Follow the same
piping procedure as that discussed in Subsection 3.1.2.
3.1.4 Line for Forced Feeding of Chemical Solution and Air-
bubbling
This line is provided to supply air for forced feeding of approximately 100 ml of the chemical
solution into the cleaning chamber during cleaning and then to bubble the chemical solution in
the chamber. During piping, connect the control box (piping port “B” [forced feeding of chemical
solution]) with the metering tank (piping port “F” [IN]) built in the holding tank for the chemical
solution, Also, connect the metering tank (piping port “G” [OUT]) with the holder (piping port “H”).
If the holding tank is positioned above the holder, always connect the tubing so at least a part
of the tubing is positioned above the cleaning chamber. Failure to observe this instruction may
result in the chemical solution fed to the cleaning chamber owing back into the holding tank after
air bubbling.
Follow the same piping procedure as that discussed in Subsection 3.1.2.
3.1.5 Line for Pressurizing KCl Reserve Tank
An air pressure of approximately 10 kPa (0.1 kg/cm
2
) is applied to the KCI reserve tank for the
pH sensor. Connect the outlet of the pressure reduction valve with the pneumatic connection
port of the KCI reserve tank. If so specied, the operating unit of the chemical cleaning system is
supplied with an “AS3” pressure reduction valve along with a polyethylene tube (10 m long) for
piping