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Instruction Manual
Setup and Operation
User Interface Basics:
The menus within the VGC-301 user interface have been designed for easy operation and a natural progression
of setup parameters. The complete map of the user interface screens is shown in appendix A. The following
sections give a brief explanation of the features for added clarity.
The four buttons to the left and right of the display are the
programming buttons. During programming of the VGC-301,
the display will identify what function each button represents.
To begin programming, press any of the four Programming
Buttons. After setting the various parameters, press the
SAVE/EXIT key to save the new setting and return to the main
screen. To continue setting additional parameters, scroll
forward with the MORE key until you reach the desired
parameter.
Menu Item Explanations:
SET UNITS
This should be the first parameter that is set. This will be the units (Torr, mBar, or Pascal) that are used for all
other settings. If the setpoints have already been set, changing units is not recommended because the setpoints
will return to their default setting. [Factory default = Torr.]
Note: Selection of mBar or Pascals requires a one time special procedure when setting Vacuum and ATM
(atmosphere). See note below under SET VACUUM and SET ATM.
SET VACUUM
Setting the Zero Point (Vacuum Adjust):
1. Evacuate the system to a pressure less than 0.1 mTorr.
2. Go to the "Set Vacuum" screen. When the pressure is below 0.1 mTorr, press the "Press to set vac" key.
The zero point is now set.
Note: When operating in units of mBar or Pascals, you must first set atmosphere. (see SET ATM listed
below). Next access the SET VACUUM menu and set vacuum. Failure to do so will result in incorrect
setting of the gauge. If you change units or reset to factory defaults then the same procedure must be
followed again if the units of display is being set to mBar or Pascals.
SET ATM
Setting the Span Point (Atmosphere Adjust):
1. Backfill the system with Nitrogen to a known pressure above 400 Torr.
2. Go to the "Set ATM" screen. When desired system pressure is stable, adjust the pressure on the screen to
the known value using the INCRease and DECRease keys on the left side of screen. Press the SAVE/EXIT
key to save the new atmosphere value.
Note: When operating in units of mBar or Pascals, you must first set atmosphere. Next access the SET
VACUUM menu and set vacuum. Failure to do so will result in incorrect setting of the gauge. If you
change units or reset to factory defaults then same the procedure must be followed again if the units of
display is being set to mBar or Pascals.
InstruTech, Inc
InstruTech VGC-301 Convection Vacuum Gauge Controller
page 9
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