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2 Wire

2 wire is used to distinguish electrical connections for measurement signals which use only two connections for carrying both the power supply and signal. The most common example is a 2 wire 4-20mA current loop output.

2 wire is also used to describe a resistive thermometer that is wired so that there is no compensation for errors caused by the connecting wire on each side of the resistive thermometer.  Therefore a 2 wire connected resistive thermometer will be less accurate than 3 wire, or 4 wire compensation method.

4 to 20 mA current loop signal measurement products
  • LMP307 Submersible Level Transmitter Water Level Transmitters with 4-20mA Output
  • LMK 487 Submersible Ballast Tank and Draught Level Pressure Transmitter
  • Analog Output Pressure Gauges
  • LMP305 Borehole Level Transmitter

Measurement Signal Related Terms

More pages related to measurement signal technical terms.

  • 3 Wire
  • 4 to 20 mA Current Loop Output Signal
  • 4 Wire
  • Amplified Voltage Output
  • BFSG – Bonded Foil Strain Gauge
  • Deadband
  • Digital Interface
  • FSO – Full Scale Output
  • HART®
  • High Frequency Response
  • Intrinsic Safety
  • Measurement Signal
  • Millivolt Output Pressure Transducers
  • mV/V – Millivolts per Volt Output Signal
  • NC – Normally Closed
  • NO – Normally Open
  • Piezoresistive Strain Gauges
  • Pressure Transmitters
  • Rangeable
  • Ratiometric
  • Span
  • Span Offset
  • Span Sensitivity
  • Square Root Extraction
  • Threshold
  • Totalizer
  • Transducer
  • Transmitter
  • TSL – Terminal Straight Line
  • TSS – Thermal Span or Sensitivity Shift
  • Turndown Ratio
  • USB
  • Vented Cable
  • Voltage Output Pressure Transducers
  • Wheatstone Bridge Strain Gauge
  • Zero Offset
  • Zero Tare

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