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8.2.16 Dry Vac
–
Pressure during the
Dry Stage
This parameter is intended to control the vacuum pressure
during the Drying Stage. It does this by opening and closing the
Air Inlet Valve. In all cases the vacuum pump runs continuously
and the Jacket is heated until the end of the Dry stage, as set by
the Dry time parameter.
This parameter is expressed in kpa, where 1 kpa = 0.145 psia
Access Code - 13
Resolution - 1 kpa
Minimum Value - 0 kpa
Maximum Value - 90 kpa
If Dry Vac = 0, the Air Inlet Valve will be closed during the
Dry Stage.
If Dry Vac is between 1 & 5, the Air Inlet Valve will be
operated in a shoot mode, 30 seconds open and 30 seconds
closed. This process will begin 4 minutes after the start of the
Dry Stage and continue until the Dry stage is completed
If Dry Vac ≥6, the Air Inlet Valve will be used to regulate the
pressure during the Dry Stage so that the value of the pressure
will not fall below the Dry Vac value. E.g., if Dry Vac = 20 (1
kpa = 0.145 psia), then when the pressure reaches 2.9 psia, the
air valve will open and remain open until the pressure rises to
3.6 psia at which point is will close again. When the pressure
drops back to 2.9psia, the valve opens again to allow the
pressure to rise. This process continues until the end of the Dry
stage. In this example the pressure fluctuates between 2.9 psia
and 3.6 psia. The Air Inlet Valve is not working in a shoot
mode, but it opens and closes around the requested Dry Vac
value.
Cycle
1 2 3 4 5 6
Default
Values
Value
5 5 5 5 5 1
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