Edwards AIM-SI1-NW25, Instruction Manual, Page: 10 / 26

D146-71-880 Issue E
Page 6 © Edwards Limited 2015. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
3.3.2 Connect to your own supply and control equipment
Note: Do not connect the electrical supply common (pin 2) to the signal common (pin 5). If you do, the AIM Gauge
pressure output signal will be inaccurate.
A schematic diagram of the recommended electrical connections to the AIM Gauge is shown in Figure 3 .
The pins on the AIM Gauge electrical connection socket are used as shown in Table 1 . The specification of the
electrical supply, d.c. relay and back EMF suppression diode are given in Section 2 .
The connection to pin 6 is optional. Make the connection to pin 6 if you want to connect the set-point output signal
to a d.c. relay; you must connect a suppression diode between pins 1 and 6 to protect the AIM Gauge from transient
voltages generated when the d.c. relay is switched off.
You can connect a voltmeter between pins 5 and 8 to measure the set-point trip level (that is, the voltage at which
the set-point output will go on); see
Figure 3 .
Connect a switch between pins 2 and 7 to enable and disable the gauge (refer to Section 4.2 ). If you want to measure
the gauge identification signal (which identifies the AIM Gauge), measure the resistance between pins 4 and 5.
Figure 3 - Schematic diagram of typical electrical connections
1. AIM gauge electrical connector
socket
2. Cable electrical connector plug
3. Electrical supply
4. Voltmeter (pressure signal)
5. D.C. relay (optional)
6. Back EMF suppression diode (optional)
7. Gauge enable switch
8. Voltmeter (set-point trip level)