YOKOGAWA vigilantplant DM8, User Manual

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<3. INSTALLATION, PIPING AND WIRING>
3-10
IM 12T03A01-02E
(4) Avoid sharp bending of the pipe to prevent accumulation of sludge.
Sampling unit
Sampling line
Main pipe
Sludge is likely to collect here.
Figure 3.15 Example of Wrong Piping
3.3.2 Air Piping for Maintenance
When cleaning the vibrator or calibrating the meter with standard solution, blow away liquid from
the vibrator by air pressure. Air should be clean and dried with 0.3 to 0.5 MPa G.
Mount a ‘stop’ valve and a ‘pressure regulator’ on the pipe from the air source, and fix a flexible
tube with a copper tube with outside diameter 10 mm should be provided for connecting with the
detector.
Connect the air pipe to the sampling unit only for cleaning the vibrator or calibration with the
standard solution.
Sampling unit
BV1 DD NV4
NV3 NV2
Stop valve
Reducing
valve
Flexible tube
Connect when cleaning the density detector
Air supply 300 to 500 kPa G
Figure 3.16 Air Piping for Maintenance
5th Edition : Dec. 11, 2015-00