Accusonic 8510+ series Reference Manual page 80

B-6 Accusonic Model 8510+ Series Flowmeter
screw clearance. Set the jacking mechanism on a clean surface (free of mud or debris), in easy reach
for the following steps.
4. Slowly loosen the union nut.
Caution: There should be no resistance caused by back pressure from the transducer acting upon
it after it has been loosened one-half turn. If there is, or if you observe any movement of the
transducer itself, STOP WORK. Immediately clear the area around the transducer of personnel
and contact Accusonic for advice.
5. Gently remove the union nut from the feedthrough assembly as shown in Figure 10-1 on page B-12. At
all times, be alert for any transducer movement.
Caution: If, at any time before the jacking tool finally is in place, you observe that the transducer
moves even slightly, STOP ALL WORK. Immediately clear the area around the transducer of
personnel and contact Accusonic for advice.
6. Gently pull the E-O connector out of the body of the transducer as shown in Figure 10-1 on page B-12.
Be alert for transducer movement.
7. Slowly screw the threaded collar of the jacking mechanism valve over the mating thread of the
transducer feedthrough. Screw the tool on until in bottoms.
Note: For the first three full turns, be sure to support the far end of the jacking tool so that it does
not exert undue torque on the transducer and feedthrough assembly. Be alert for transducer
movement.
8. Slowly rotate the bearing lever to advance the tip of the jacking screw into contact with the end of the
transducer. This must be done by feel, since the two components meet inside the tool valve. Stop when
contact is made.
9. While holding the bearing lever stationary, use a wrench to gently and slowly turn the jacking screw so
that it advances into the end of the transducer and begins to engage the inside thread of the transducer.
10. Alternate between turning the bearing lever and then holding it stationary and advancing just the
jacking screw to continue threading the jacking screw into the transducer. Do not force it. Continue
until the screw bottoms.
Note: As you screw the tool into place, it is necessary to alternately advance and back off on the
bearing handle because two threads of different pitches are being taken up at the same time.
11. After the jacking screw bottoms in the transducer, back the screw off slightly so that it will be easier to
separate the two later.
12. Turn the bearing lever so that the jacking screw presses the transducer unit assembly inward slightly,
thereby releasing tension on the locking pin.
Note: The locking pin should rotate easily when it is freed. If necessary, work the bearing lever
forward and backward (moving the transducer slightly in and out of the feedthrough) until the pin
is free.
13. Slowly loosen the transducer locking pin.
14. Rotate the bearing lever to withdraw the transducer 3/4 of an inch (20mm).
15. Tighten the locking pin firmly against the shaft of the transducer and then back it off one quarter of a
turn. This prevents water leakage from around the locking pin.
16. Continue to extract the transducer just until the second O-ring on the transducer body becomes visible -
about 3/4 (20mm) inch of the transducer is visible. The transducer face is now clear of the ball valve.
(See Figure 10-1 on page B-12).
17. Close the jacking tool valve.