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Turndown Ratio

Turndown Ratio describes the difference between the highest and lowest possible span of measurement output which can be set for a sensing device with a rangeable output signal such as 4 to 20mA output which is HART enabled.

Turn-down ratio refers to rangeable output devices and indicates how much the output setting can be changed.

e.g. A 10:1 turndown ratio on a 1 bar gauge pressure transmitter would allow the following:

  • Highest range setting: 0 to 1 bar absolute = 4 to 20mA
  • Lowest range setting: 0 to 100 mbar absolute = 4 to 20mA
Rangeable output measurement products
  • DPT200 Pressurised Tank Level Differential Pressure Transmitter
  • LEO3 Current or Digital Output Pressure Gauge
  • 33X High Accuracy Digital Output Pressure Sensor
  • Rangeable DP Sensors

Measurement Signal Related Terms

More pages related to 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
  • 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
  • USB
  • Vented Cable
  • Voltage Output Pressure Transducers
  • Wheatstone Bridge Strain Gauge
  • Zero Offset
  • Zero Tare

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Measurement Instrument Specifier

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Wirelessly Measure & Log 4-20mA

Use this battery powered wireless 4-20mA wireless transmitter to transmit readings to a receiver connected to USB, RS485, RS232, cellular network or analog output

Use this battery powered 4-20mA wireless transmitter to transmit readings to a receiver connected to USB, RS485, RS232, cellular network or analog output

Featured Product Types

  • Hydraulic Analog Voltage Signal Pressure Transducers
  • High Temperature Pressure Transmitters
  • Natural Gas Pressure Transmitters
  • Diesel Fuel Tank Level Sensors
  • Hydrostatic Level Sensors
  • 0-5 Volts Output Pressure Transducers

Product Enquiry

Send us your enquiry for a product associated with this Turndown Ratio page, and get assistance with selecting a product for your application.

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