Dwyer LPCP - Manual (Page 2)

Problems
Hard to
Pressurize
Leakage
Problems
Other
Attentions
Causes
A. Isolating/vent is not open.
B. Release valve is not closed.
C. The gage under the test is loose.
D. O-seal has broken off.
E. Flexible hose is loose.
F. Lever falls off.
G. If the (±) conversion handle & port is correct or not.
A. For pressure gage under test, the screw’s bottom
surface isn’t smoothed. (straight screw).
B. The screw thread of test meter is taper screw.
C. Rubber seal on joint is aged or frayed.
D. The system has been blocked, the cover of isolating
and release valve is dirty.
E. Test meter has leaks.
F. Pressure pump leaks.
G. Flexible hose leaks.
A. Oil slide in system.
B. The movement components sound abnormal.
C. The conversion seal loop of the (±) pressure is broken.
D. Some parts are aging.
TROUBLESHOOTING
Solutions
Open the isolating/vent valve.
Close the release valve.
Turn the reference gage and the gage under test tightly.
Install or replace new O-seal (3 pieces, D= ø8).
Connect flexible hose well.
Turn the lever clockwise.
Please confirm the position of conversion handle when system has no pressure.
Use a transition joint with a PTFE seal in the joint which will be screwed tightly to the tested meter
joint by a tool, then screw them tightly to the test pump again.
Must use the PTFE plat seal and transition joint to tighten the screw thread, then screw them tightly
with the pneumatic test pump again.
Change O-seal (3 pieces, D= ø8).
Pressurize and release pressure again and again to drift impurity that is rested on seal surface of
isolating or release valve.
Replace other meter and test leakage again.
Connect the reference gage and block the other port with plugs tightly. Pressurize and check the
airproof performance.
Cut 15 mm hose head and try again.
In order to avoid liquid impurity from test meter, suction back into test pump and confirm the location
of (±) conversion handle before test.
Lubricate the key components timing.
Should be switched under the system if no pressure.
Lubricate rubber seal periodically.
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: [email protected]
©Copyright 2014 Dwyer Instruments, Inc. Printed in U.S.A. 2/14 FR# R1-443835-00 Rev. 1