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Span

Span is the difference between the lowest and the actual reading or output signal of a measurement device.

For example a 1.6 bar pressure transmitter maybe re-scaled to read 4mA at 0.8 bar and 20 mA at 1.2 bar.  In this example the pressure transmitter would be described as having a span ranging from 0 to 0.4 bar.

Featured span output adjustable measurement products

  • DMP331i High Accuracy Pressure Transmitter
  • Low Differential Pressure Transmitters DPS300 User Switchable Pressure Range, Volts or Current Output Low DP Sensor
  • XMPi Process Plant Gauge and Absolute Pressure Transmitter
  • DPS Low Differential Pressure Transmitter DPS Low Differential Pressure Transmitter

Glossary of Measurement Signal technical terms

  • 2 Wire
  • 3 Wire
  • 4 to 20 mA Current Loop Output Signal
  • 4 Wire
  • Amplified Voltage Output
  • BFSG – Bonded Foil Strain Gauge
  • Deadband
  • FSO – Full Scale Output
  • HART®
  • Intrinsic Safety
  • mV/V – Millivolts per Volt Output Signal
  • NC – Normally Closed
  • NO – Normally Open
  • Piezoresistive Strain Gauges
  • Rangeable
  • Ratiometric
  • 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
  • Wheatstone Bridge Strain Gauge
  • Zero Offset
  • Zero Tare

Help from Measurement Signal resources

  • Transforming a 2 wire Current Loop into a Voltage Output Signal
  • Supply voltage and load resistance considerations for pressure transmitters
  • What can cause random variation in pressure transducer output
  • What is the difference between zero offset and zero drift?
  • Why use 4-20mA and 3-15 psi rather than 0-20mA & 0-15psi

Guidance with Measurement Signal requirements

  • Wireless
  • Measurement Signal
  • Rangeable
  • Intrinsic Safety
  • High Frequency Response
  • Digital Interface

Tools for Measurement Signal calculations

  • Pressure Sensor Calculator
  • Temperature Sensor Calculator
  • DP Flow Transmitter Output Calculator
  • 4 to 20 mA Supply, Load, Shunt and Signal Calculator

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Products

  • Pressure
  • Level
  • Temperature
  • Interfacing
  • Datalogging
  • Calibration
  • Wireless

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