At
the chamber (measuring point
at
base
of
valve)
at
maximum time
of
evacuation.
If
more than 6 torr, proceed directly to the pump,
if
more than 3 torr:
have pump service
by
pump supplier.
If
pressure
at
pump is good, reconnect
hoses to pump and measure again.
Verify
at
vacuum hose connections and valve connections.
When proceeding this way, starting from pump, loss
of
pr
essure per step must not
exceed 0.5 to 1 torr.
Warning: Verify connections
of
measuring equipment before verifying machine.
Most frequent points
of
leakage: lid gasket, damaged vacuum hose
or
loose hose
clamps.
4.3 Faulty seal:
4.3
.1
Insufficient seal:
Damaged Teflon
or
silicone rubber.
Sealing pressure too low, bellows leaking
or
pressure bar jammed.
Leakers in seal: heating wire mechanically damaged (knicked) or silicone rubber
uneven.
4.3.2
No
seal:
4.3.3
Sealing wire burnt.
Faulty contact in sealing circuit.
Sealing transformer burnt through.
Contactor does not work.
Permanent sealing current:
Contactor is jammed check sealing transformer for damage through overload.
4.3.4 Seal does not stick:
Insufficient layer
of
polyethylene (inferior quality
of
bags).
Seal area extremely contaminated by
fat
or meat juice. Use filling aid.
Sealing temperature is too low (when using very thick films).
Warning: Do not increase sealing time more than really necessary; higher
temperature will reduce working life
of
Teflon and silicone rubber.
4.4 Fault in the valve:
Vacuum
or
air valve does not open.
17
.
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