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Instruction Manual
3.2
Electrical Installation
3.2.1 Grounding
Be sure the vacuum gauge and your vacuum system are properly grounded to protect personnel from shock
and injury. Be aware that some vacuum fittings, especially those with O-rings, may not produce a good
electrical connection between the gauge and the chamber it is connected to.
3.2.2 Electrical Connections
A good recommended practice is to remove power from any cable prior to connecting or disconnecting it.
The InstruTech VGC301 may replace similar controllers from other manufacturers, such as the Granville-Phillips®
375 controller. Many of these other controllers employ the same 9-pin 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 on the next page. Rewire your cables as necessary.
DC Power Input
The VGC301 accepts DC power from 12 to 30 Vdc, 2 W. If the user prefers to use AC power, InstruTech offers
the series PS301 optional power supplies with various AC Plugs.
2-pin pluggable terminal strip (Mating connector: Phoenix p/n 1803578 or InstruTech p/n 000729).
pin number
1
2
InstruTech, Inc.
gauge
connector
pin description
+12 to +30 V
ground
Remote I/O &
interface connector
relay
DC Power
connector
Input
VGC301 Controller
Page 10
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