User Manual

WPS500X User’s Guide Pico Technology
12 DO157-9
Dismantle the bleed valve and allow any liquid to drain out.
The bleed valve in your WPS500X pressure transducer may be either a ball
valve, a needle valve or a Schrader valve, as shown in the drawings below.
Ball valve
If the ball is still inside the ball valve,
allow it to drop out. Clean and oil the
ball with a non-hygroscopic oil that is
compatible with steel and aluminum.
Ordinary motor oil is suitable.
If the ball needs replacing, see Section
0: “”.
Clean the bleed screw. Flush out the
measurement chamber with brake
cleaner if necessary, then replace the
ball and the bleed screw.
Needle valve
Clean the bleed screw. Flush out the
measurement chamber with brake
cleaner if necessary, then replace the
bleed screw.
Push-button valve
Remove the countersunk screw from
the back of the transducer near the
push-button.
Hold the transducer upside-down with
the screw hole facing down.
Prepare to catch the retaining pin that
will drop out of the hole in the next
step.
Depress the push-button until the
retaining pin drops out.
Withdraw the push-button assembly,
including the spring.
Clean the valve parts, spring, retaining
pin and screw with brake cleaner.
Flush out the measurement chamber
with brake cleaner. Push in the centre of
the Schrader valve, visible at the
bottom of the push-button hole, to
allow the cleaner to flow through.
Replace the push-button, retaining pin
and screw. When replacing the screw,
take care not to allow any grit into the
mechanism. The screw should be
hand-tight.
WPS500X with ball valve
WPS500X with needle valve
WPS500X with push-button valve