tinb29e1-c (2019-10) VGC083A_B.om 41
3) Apply power to the alternate gauge.
4) Next apply power to the VGC083.
5) Select ALTERNATE GAUGE in the SETUP UNIT menu.
It is always good industry practice to avoid hot-swapping of Cables.
It is important to set vacuum and atmosphere when initially setting up the con-
vection gauges. See Convection Gauge Initial Setup section 5.6
This programming menu allows the user to set the atmospheric pressure reading
(also known as the "span" adjustment) and vacuum reading ("zero" point) for con-
vection gauges CG1 and CG2. INFICON advises that you first determine if the
"span" (ATM) adjustment of your measurement device is set properly before set-
ting the "zero" (VAC) adjustment. It is good practice to perform the sequence of
checking and adjusting ATM (span) then VAC (zero) and then, finally re-checking
the ATM setting to ensure that the circuitry is properly balanced for use in measur-
ing pressure throughout the intended measurement range. Press the ENTER key
to access the CONVEC GAUGE menu for configuring the convection gauges.
[Factory default = 0.00E 00]
Press the ENTER key to access the SET VAC CG1 screen.
1. To properly set the vacuum reading (“zero” point), with CG1 installed on your
vacuum system, the gauge should be evacuated to a pressure below 1.00E-
04 Torr (0.1 mTorr). [Factory default = 0.00E+0 Torr]
2. When the known vacuum system pressure is below 0.1 mTorr and If you want
to set zero at 0.00E+0, then press the ENTER key repeatedly until the SET
VAC CG1 appears on the display again. The zero point (displayed pressure
reading with gauge exposed to vacuum) is now set.
If you want to set the ‘zero’ pressure reading to a number higher than 0.00E+0,
then press the UP or DOWN keys at each of the high-lighted numeral locations
until the desired number is reached; then press the ENTER key repeatedly until
the SET VAC CG1 appears on the display again. The new "zero point" is now
set. Due to the nature of circuit operation and head electrical control that cover
a wide range of measurement by a convection gauge, it is advised that one first
check and adjust, if necessary, the "span" and "zero" to ensure that all
measurements made between these two, adjusted settings are as accurate as
possible.
[Factory default = 7.60E 02 TORR]
Press the ENTER key to access the SET ATM CG1 screen.
Backfill the vacuum vessel /chamber with nitrogen gas to a known pressure bet-
ween 400 Torr and 1000 Torr. Alternatively, if your local uncorrected barometric
pressure (air) is known, simply vent your vacuum system chamber to expose the
gauge to the local atmospheric pressure. When desired system pressure is stable,
adjust the pressure on the screen to the known value using the UP or DOWN keys.
Press the ENTER key to move to the next digit and use the UP or DOWN keys to
decrease or increase the value of that digit. Continue pressing the ENTER key until
the SET ATM CG1 reappears on the display. The new atmosphere point is now
set. For example, if your known local uncorrected barometric pressure is 760 Torr,
enter 760 in the SET ATM screen. The main pressure measurement screen will
now display 760 Torr while the gauge is at atmosphere.
[Factory default = PRESS ENTER TO SET VAC]
Same as SET VAC CG1 above, except for CG2
[Factory default = 7.60E 02 TORR]
Same as SET ATM CG1 above, except for CG2.
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