High Pressure Connections; Charging Hydraulic Accumulator - Microfluidics Microfluidizer LM20 User Manual

4.4 High Pressure Connections

If a coned and threaded connection is not prepared correctly, a leak will be evident through a weep hole
(every coned and threaded connection has a weep hole). Usually leaks can be stopped by simply
retightening the gland nut. However, if retightening the gland nut does not stop the leak, the connection
MUST be taken apart, cleaned, and reassembled. Position the collar properly and remake the connection.
!
"WARNING": TURN OFF PROCESSOR AND WAIT 5 MINUTES BEFORE TIGHTENING HIGH PRESSURE
CONNECTIONS.

4.5 Charging Hydraulic Accumulator

!
WARNING: THE USE OF OXYGEN WILL RESULT IN AN EXPLOSION OF THE HYDRAULIC ACCUMULATOR.
CHARGE THE ACCUMULATOR WITH DRY NITROGEN ONLY.
The part number of the U.S.A charging kit is 80.0006. Kits for other countries are available.
Make sure nitrogen supply is shut off. Attach hose to nitrogen bottle.
1. Remove gas valve guard and gas valve cap from accumulator and attach valve extender if
needed.
2. Back gas chuck "T" handle all the way out (counter clockwise) before attaching charging
assembly to accumulator gas valve.
3. Close bleed valve.
4. Make sure not to loop or twist the hose, attach swivel nut to gas bottle valve and tighten.
5. Turn gas chuck "T" handle clockwise 1 turn. Do not turn the "T" handle all the way in, as it will
damage the valve core.
6. Crack open nitrogen bottle valve and slowly fill accumulator. Open "T" handle slowly until gauge
shows pressure. Shut off when gauge indicates desired pre-charge.
MANUAL.LM20 Revision C January 2023 Page 30 of 52