• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
SensorsONE

SensorsONE

Measurement Instrumentation Products

  • Products
  • Tools
  • Contact

What can cause random variation in pressure transducer output

I have a 10bar pressure transducer with a 4-20mA output which is showing a random variation across a span of 0.3mA (+/- 1.5mA) at a fixed pressure.  This seems to me to be very large and it doesn’t seem related to electrical noise.  What is the possible cause of this output fluctuation and what would you expect the variation to be for a pressure transducer with a high accuracy current output?

Even a low grade accuracy pressure transducer should produce a more stable output signal. The variation you are experiencing equates to a total variation of 0.375% FS which is not acceptable for most types of sensors. The pressure transducer maybe faulty if the variation is truly random, but first you will need to eliminate any application variations that might be causing the drift in output:

  1. Is there any correlation with temperature change? Even with high accuracy pressure transducers, the errors can be quite significant with changes in temperature. The actual variation can vary depending on the manufacturer and type of sensor.
  2. Is the power supply adequate? Running the sensor near the minimum supply voltage limit can sometimes lead to problems especially if there is additional load resistance in series with the sensor.
  3. Is there a nearby source of electrical interference? A 4-20mA output signal is a robust signal, but if the electronics inside the transducer are not adequately protected some of the active solid state components may be susceptible to interference, especially if the EMC levels are exceptionally high.
  4. Is the pressure really fixed? If the vessel / pipe is a sealed system, the pressure will vary with changes in volume or temperature, are there any moving parts or heat sources that could cause the pressure to fluctuate?
  5. Have you checked the wiring connections? Poor electrical contacts could lead to fluctuations in output signal.
If the transducer does not improve after checking through the possible causes of output signal fluctuations outlined above, we would suggest you return the transducer to where you sourced it from and ask them to investigate the fault.
4-20mA output pressure transducer products
  • Vacuum Pressure Transmitters
  • TPHADA Ultra High Range Pressure Sensor TPHADA Ultra High Range Pressure Sensor
  • DPS Low Differential Pressure Transmitter Low Differential Pressure Transmitters
  • DPS Low Differential Pressure Transmitter Low Pressure Transmitters

Request info on 4-20ma output pressure transducer products for your application.

Primary Sidebar

Pressure Sensor Specifier

Specify a pressure sensor
Select your pressure sensor requirements

Product Selection Guides

  • Data Loggers
  • Differential Pressure Sensors
  • Digital Pressure Gauges
  • Digital Pressure Sensors
  • Digital Readouts
  • Hydrostatic Liquid Level Sensors
  • Millivolt Output Pressure Transducers
  • Pressure Transducers
  • Pressure Transmitters
  • Voltage Output Pressure Transducers

Application Selection Guides

  • Absolute Pressure
  • Differential Pressure
  • Dual Temperature and Pressure
  • Flush Diaphragm
  • High Frequency Response
  • Low Pressure Range
  • Overpressure Protection
  • Vacuum

Help Guides

  • Advantages and Disadvantages of using a 4 to 20 mA Signal
  • Calculating required pressure range for fuel tank level measurement
  • What is the difference between vacuum and absolute pressure
  • Determining the hydrostatic pressure range for a tank level sensor
  • Measuring vacuum with negative gauge or absolute ranges
  • Determining water tank volume using hydrostatic pressure
  • How to get a 10 volt signal from a 4-20mA output pressure sensor
  • Measuring the difference in air pressure between rooms
  • What does negative and positive gauge pressure mean

Product Enquiry

Send us your enquiry for a product associated with this What can cause random variation in pressure transducer output page, and get assistance with selecting a product for your application.

Email Your Enquiry

enquiries@sensorsone.com

© 2022 SensorsONE Ltd, all rights reserved

  • Home
  • Products
  • Tools
  • Legal
  • Contact