Electrical Installation; Grounding; Connectors - Instrutech Hornet User Manual

Instruction Manual
3.2

Electrical Installation

3.2.1 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 when not used with
metal clamps, may not produce a good electrical connection between the gauge and the chamber it is
connected to. Use a ground lug on the vacuum connection flange of the pressure measurement device if
necessary.

3.2.2 Connectors

The IGM401 allows for operation of the unit including turning the gauge/filaments on/off, selecting emission
current and turning degas on/off using digital inputs, RS485 communication commands or the front panel push
buttons.
Good, recommended practice is to remove power from any cable prior to connecting or disconnecting it.
The IGM401 is provided with two D-sub connectors used for I/O interface as shown below:
1. 9-pin, D-sub male (DE-9P) connector for Digital I/O and analog output.
2. 9-pin, D-sub female (DE-9S) connector for relay connections and RS485 serial communications.
When using InstruTech's power Supply PS501A, connect the power supply to the ANALOG connector. If using a
power supply other than InstruTech's PS501A, connect your power supply to either the RS485 or the ANALOG
connector as shown on the next page.
CAUTION! Do not connect power to both the Analog and the RS485 connectors.
Fabricate a cable according to your interface requirements. For analog signals and digital inputs use the 9-pin,
D-Sub male (DE-9P) connector. For relay connections and serial communications use the 9-pin, D-Sub female
(DE-9S) connector. Refer to the following pages for detailed explanations of the connector pin-outs.
InstruTech, Inc.
IGM401 I/O Interface
IGM401 Hornet
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