Back to the Basics: How Do I Wire a DC 2-wire Sensor?

May 06 [Wed], 2015, 15:39
Back to the Basics: How Do I Wire a DC 2-wire Sensor?



In one of my antecedent column we covered “How do I wire my 3-wire Catalytic Gas Sensor
“. This affair has had a lot of absorption so I anticipation to myself, this would be a abundant befalling to add to that accountable and allocution about DC 2-wire sensors. Typically in branch automation applications 2 or 3 wire sensors are implemented aural the process, and as you apperceive from my above-mentioned column a 3 wire sensor has the afterward 3 wires; a adeptness wire, a arena wire and a about-face wire.

A 2-wire electrochemical gas sensor
of advance alone has 2 affairs including a adeptness wire and arena wire with affiliation options of Polarized and Non-Polarized. A Polarized advantage requires the adeptness wire to be affiliated to the absolute (+) ancillary and the arena wire to be affiliated to the abrogating ancillary (-) of the adeptness supply. The Non-Polarized versions can be active just as a Polarized sensor about they aswell accept the adeptness to be active with the arena wire (-) to the absolute ancillary and the adeptness wire (+) to the abrogating ancillary of the adeptness accumulation authoritative this a added able advantage as the sensor can be active with the affairs in a non – specific area aural the adeptness accumulation and controls.

In the base diagrams beneath you will apprehension the altered alarm outs for the Polarized vs. Non-Polarized offerings.

PolarizedDiagramsnon-polarized diagramsNote: (-) Indication of Non-Polarized wiring.

While 3-wire sensors are a added accepted advantage as they action actual low arising current, 2 wire offerings do accept their advantages per application. They can be active in a biconcave (NPN) or sourcing (PNP) agreement depending on wholesale industrial
the called amount location. Aswell accumulate in apperception they alone accept 2 affairs simplifying affiliation processes.

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