YOKOGAWA PH450G

<5. Inspection and Maintenance>
5-3
IM 12B07W01-04EN 1st Edition : Nov. 11, 2016-00
<Standard position of spring-adjustment nut>
The standard position of the spring-adjustment nut is where it is when the spring contracts
9mm from the position of its upper end (free length) which is given when the gasket surface
comes into slight contact with the bottom surface of the cleaning chamber.
c. Tighten the spring locknut.
(3) Tighten the locknut.
F5.1.ai
Spring locknut
Spring-adjustment nut
Spring
Locknut
Stopper
Cleaning chamber
Gasket
Bottom plate
Figure 5.1 Construction of PH8HS3 Holder
WARNING
When highly concentrated sulfuric acid or hydrochloric acid are used, remove those remaining
solutions in the cleaning chamber before starting cleaning.
Sulfuric acid or hydrochloric acid at high-concentration level causes serious damage to human
health and corrosive characteristics to metals. Use proper care to handle these solutions.
5.2.3 Cleaning and Lubricating Pneumatic Cylinder for
Driving the Sensor Holder
The slider on the pneumatic cylinder for driving the sensor holder slides along the cylinder
barrel. Inspect the barrel to make sure that it is free from any foreign matter or dirt. If the barrel
is contaminated with dust which will prevent the slider from moving properly, use a clean cloth to
remove the dust. The slider may stay at its lowest position for a prolonged period depending on
the interval between cleanings. If the slider has been in this position for a long time, it may fail to
start moving smoothly at a preset pneumatic pressure. Wipe off any dust on the cylinder, if any.
If your system has the air cylinder cover, remove the cover to inspect and clean. How to remove
the cover is as follows. When you restore the cover again go backward the procedure.
(1) Keep the sensor holder at the lowest position ( measuring position ).
(2) Remove all 4 screws that x the cover(up and down , 2 screws for each.)
(3) Slide the cover upward to take off.