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Instruction Manual
Installation - Electrical Connections
Grounding: Be sure the vacuum gauge and the rest of your vacuum system are properly grounded to protect
personnel from shock and injury. Be aware that some vacuum fittings, especially those with O-rings, do not make
a good electrical connection between the gauge and the chamber.
A good recommended practice is to remove power from any cable prior to connecting or disconnecting it.
The InstruTech VGC-301 may replace similar controllers from other manufacturers, such as BOC/Edwards,
Helix/Granville-Phillips, Inficon, MKS Instruments, Varian Vacuum, and others. Many of these employ the same
9- and 15-pin D connectors, but they do not all use the same signal/pinout configurations. If you wish to use your
existing cables, be sure to check compatibility with the tables below, and rewire your cables as necessary.
AC Power Input
Universal AC power cord input plug. The VGC-301 accepts AC power from
power cord with North America 115 VAC plug on the other end. Consult InstruTech for availability of AC
includes a
cords with plugs for other countries.
DC Power Input
Two-pin pluggable terminal strip (Mating connector: Phoenix p/n 1803578 or InstruTech p/n 000327).
pin number
1
2
Note: The VGC-301 will operate from either AC or DC power. It is not necessary to supply both.
InstruTech, Inc
InstruTech VGC-301 Convection Vacuum Gauge Controller
pin description
+12 to +30 V
ground
1
6
1 2
100 to 240 VAC, 50/60Hz. The VGC-301
page 7
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