Wiring - PCB Piezotronics IMI SENSORS 649A04 Installation And Operating Manual

Wiring

The sensor operates from a standard 2-wire, 4-20mA loop. If using a loop powered unit, attach the positive (+)
input from the power supply to Pin A on the sensor and the negative (-) input from the power supply to Pin B of
the sensor.
Figure 6 – Loop-Powered Wiring Figure 7 – Loop-Powered Wiring with DC Source
If using a standard DC power supply, install either an ammeter and/or load resistor in line with the output.
The resistor will generate a DC voltage that is proportional to current by:

V IR
  
If R 500 ohms and I 6 mA then V , 3 VDC
Note:
- Resistor value must be less than: (Vsupply – 12) x 50.
- For integral cable sensors: RED wire is positive, BLUE wire is negative.
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