Electrical Installation; Grounding; Connectors - Instrutech The Hornet IGM402 User Manual

Instruction Manual

Electrical Installation

3.3

Grounding

3.3.1
Be sure the vacuum gauges 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.

Connectors

3.3.2
The IGM402 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 soft-
keys.
Good, recommended practice is to remove power from any cable prior to connecting or disconnecting it.
The IGM402 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 RS485 serial communications and ion gauge relay connections.
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 RS485 COM 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 ion gauge relay connections and serial communications use the 9-pin D-Sub
female (DE-9S) connector. For convection gauge analog and relay connections use the green terminal blocks.
Refer to the following pages for detailed explanations of the various connector pin-outs.
InstruTech
IGM402 I/O Interface
IGM402 Hornet
Page 14