What Does the Millivolts per Volt Unit for a Bridge-Based Sensor Mean?

Updated Oct 10, 2018

Reported In

Hardware

  • CompactDAQ Chassis
  • C Series Strain/Bridge Input Module

Driver

  • NI-DAQmx

Other

  • Strain gauges
  • Load cells
  • Force transducers
  • Pressure transducers
  • Torque transducers

Issue Details

  • I have a bridge-based sensor and its rated output is given in mV/V. What does this mean?
  • How can I make sure that my bridge sensor voltage output level is within the range of the DAQ device that I am using?

Solution


Bridge-based sensors typically specify rated output (R.O.) in millivolts per volt (mV/V), where mV/V is the ratio of output voltage to the excitation voltage required for the sensor to work. These sensors are strain gauge based sensors that provide a voltage output that is proportional to the excitation voltage. For example, a sensor with a nominal rated output of 2 mV/V excited with 5 V will provide a nominal voltage output of 10 mV, whereas a 10 V excitation will derive in a nominal voltage output of 20 mV.

 

During use, the resistance of the sensors change based on external conditions and the output voltage value is returned by the transducer.

Additional Information

Bridge sensors are a common type of pressure measurement. Bridge sensors are made of a strain gauge and a diaphragm with a change in pressure casuing a corresponding resistance change. This mechanism allows pressure to be accurately measured in DAQ systems.

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