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Sensing Performance

Author : KJT Date : 2015-6-5 17:43:20
 

Sensing Performance 

 Specifications for sensing performance include operating distance and repeatability.

  • Rated operating distance is the critical distance at which switching takes place. It is important to choose a sensor that will operate in the required sensing range. This could be dictated by process requirements and mounting option.
  • Repeatability is the distance within which the sensor repeatably switches. It is a measure of precision. Depending on the application, precision could be an important design criterion when selecting a sensor. 

 

Electrical Switch Performance

 Depending on the power options available, power requirements may be a key specification when selecting a sensor.

  • The device can be powered by either an AC or DC power source.

Load configurations are important parameters to consider.KJT proximity sensors may switch an AC load or a DC load. DC load configurations can be NPN or PNP.

  • NPN is a transistor output that switches the common or negative voltage to the load; load connected between sensor output and positive voltage supply.

  • PNP is a transistor output that switches the positive voltage to the load; load connected between sensor output and voltage supply common or negative.

Wire configurations are 2-wire, 3-wire NPN, 3-wire PNP, 4-wire NPN and 4-wire PNP. 

 

2-Wire DC circuitry typically includes a diode bridge in series with the sensor, allowing functionality either as NPN or PNP in a DC circuit.