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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.
AC Power Input
Universal AC power cord input plug. The VGC301 accepts AC power from 100 to 240 VAC, 50/60Hz. The
VGC301 includes a power cord with North America 115 VAC plug on the other end. Plug adapters or power/cord
sets should be readily available for various other AC mains connections in other countries.
DC Power Input
2-pin pluggable terminal strip (Mating connector: Phoenix p/n 1803578 or InstruTech p/n 000327).
pin number
1
2
Note: The VGC301 will operate from either AC or DC power. It is not necessary to supply both.
InstruTech, Inc.
pin description
+12 to +30 V
ground
1
6
1 2
VGC301A Controller
®
Page 10
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