Operator`s manual

Sentry 2.0 Controls VirTis BenchTop 2K, 4K and 6K

12 Revision 004, 12/09

2. Vacuum

The LEDs on the top wave represent the following vacuum setpoints:

LED Vacuum (mTorr) Color

1 2000 Red

2 1000 Red

3 500 Amber

4 200 Amber

5 100 Green

6 50 Green

7 ≤ 20 Green

Button Functions

Up/Down (+/-) Buttons

The Up/Down (+/-) buttons allow you to navigate the menus and increase or decrease

setpoint values displayed on the LCD display.

MENU Button

The MENU button performs a number of functions. During an alarm condition,

pressing the MENU button will temporarily silence (but not clear) the alarm. When

viewing the Synoptic screen, the MENU button will display the Main Menu.

The MENU button also acts as an enter key, activating the selected option. To return

to a previous menu, highlight the carat (∧) at the top left corner of the LCD screen and

press the MENU button.

COND Button

The COND button activates the refrigeration system. This provides system cooling for

vapor condensing.

VAC Button

The VAC button enables the vacuum pump and opens the vacuum brake solenoid

(VBS) valve, allowing the system to be evacuated. Vacuum level control options can

be programmed from the User Options screen.

Note: If your vacuum pump is not connected to the IEC plug on the rear of the BenchTop unit,

the VAC button will not control your pump. See your pump manual for operation instructions.

AUTO Button

The AUTO button will start the refrigeration and vacuum systems in a set sequence.

The condenser will first cool to the condenser setpoint. Once the setpoint is achieved,

the vacuum pump will energize and begin evacuating the system.

DEFR Button

The DEFR button activates the condenser defrost function. Hot gas defrost is directed

toward the condenser walls to quickly loosen ice.

Note: Defrost mode is disabled while any other function is on.