VACUUBRAND CVC 3000 E User Manual

Page 36

Set vacuum: The ”Set vacuum” is the lower set point for two-point

vacuum control.

The ”Set vacuum” is adjustable in a range of 0-795 Torr (0-1060 mbar).

Hysteresis: The ”Hysteresis” is the control bandwidth of the two-point

control. A too small hysteresis will lead to frequent switching of the

valve or the pump. A too large hysteresis will lead to imprecise control.

Suggested ”Hysteresis” values (see table) are stored in the controller

(setup ”Auto”) and are adapted automatically to the preset pressure.

The hysteresis can be adapted at any time.

The ”Hysteresis” is adjustable in a range of 1-225 Torr (1-300 mbar) or

can be set to ”Auto”.

Maximum: An upper pressure limit can be preselected. The pump

switches off if the pressure limit is exceeded, e.g., at the end of suc-

tions or filtrations. The pressure limit is only active once the pressure

has gone below ”Maximum”.

The ”Maximum” is adjustable in a range of 794-1Torr (1059 - 1 mbar)

(at the least 1 Torr (mbar) higher than the ”Set vacuum”) and to ”Off”.

”Off” means that no ”Maximum” value is preset.

Delay: ”Delay” determines the time the coolant valve remains open af-

ter the process has been stopped. Determines also the time the pump

(only with VMS module and in-line valve) remains running after the

process has been stopped.

The ”Delay” is adjustable in a range of 1-300 minutes or can be set to

”Off” (”Off” means that the coolant valve closes immediately - and that

a pump with VMS module and in-line valve is switched off immediately

- when the process stops.).

Duration: ”Duration” determines the total process time since control

start.

A preset ”Duration” (process time) has no effect if the process is

stopped due to a preset ”Maximum” before ”Duration” is reached.

The ”Duration” is adjustable between 1-1440 minutes (24 h) or can be

set to ”Off”. ”Off” means that no endpoint of the process is defined.

Set vacuum in Torr

100

200

500

700

Hysteresis in Torr

(suggested values)