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< 3. Installation, Piping and Wiring >
3-5
IM 19H1D2-01E
3.4 Piping and Wiring (for cleaning)
The following information concerns only the submersion type holder with jet washing device.
For wiring when an optional wiper cleaning unit is specified for the MLSS sensor, refer to the
user's manual of the SS350G Controller for Wiper Cleaning.
3.4.1 Items to Note with Regard to Piping Work
Piping is provided to the submersion type holder with jet washing device to supply the air or water
used for washing.
Exercise care with the regard to the following during the piping work.
• Washing device maintenance should be easy to perform.
Use a soft hose (net-impregnated soft polyvinyl chloride resin tube) for the piping around
the submersion type holder. To be on the safe side, make sure that there is enough hose to
allow far errors.
• In winter, provide heat insulation if there is a possibility the washing water will freeze.
Washing is performed at designated intervals (any time cycle can be set using the
converter).
• Use a pipe with a diameter sufficient to provide the necessary pressure and flow rate.
Use 15 A nominal diameter size for air pipes.
The solenoid valve in the washing pipe line should be 15 A aperture (pipe joint port) that
operates normal close (that closes when electrified).
Yokogawa provides solenoid valves with the following specifications.
[Model PH8MV Solenoid Valve]
Pilot kick operated, 2-port valve. Open when energized.
Fluid: Normal tap water, industrial water, or air
Operating pressure:
0 to 1 MPa
Forward (reverse) pressure resistance: 2 MPa
Fluid temperature: Water; 5 to 60°C, Air; -10 to 60°C
Cv: 4.5
Process connection:
Rc 1/2
Power supply: 100/110/200/220 V AC, 50/60 Hz
Construction: IP53
Material:
Body; Bronze
Sealing; Nitrile rubber
Ambient temperature:
Maximum 50°C
Cable inlet connection: G 1/2
Weight: Approx. 0.9 kg