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

SensorsONE

  • Products
  • Tools
  • Contact

Checking the LHR error of a 0-5 Vdc output pressure transducer

We have a transducer which is rated for 0-2000 psi, and it outputs 0-5 Volts. The specification document states that the accuracy is a combined LHR of +/- 0.5 %FS, how would we check this?

I am trying to create a test to check the transducer to ensure it is working properly. If I test the transducer at every 200 psi, how much allowable error can I expect to see based on the accuracy spec provided?

Pressure transducer products
  • IMPLR Low Range All Stainless Steel OEM Pressure Sensor
  • IMP Low Cost Pressure Sensor
  • Low Differential Pressure Transmitters DPS300 User Switchable Pressure Range, Volts or Current Output Low DP Sensor
  • TPHADA Ultra High Range Pressure Sensor TPHADA Ultra High Range Pressure Sensor

In order to check the LHR (linearity, hysteresis, and repeatability) error of a pressure transducer, firstly the reference baseline for linearity errors needs to be chosen from one of the following three error calculation methods:

Absolute Accuracy – Straight line for a 0…2000 psi against 0 and 5 volts output device representing the best possible theoretical performance. This method is mostly used for pressure indicators and calibrators, since they are ready to use without any initial calibration adjustment.

Best Straight Line (BSL, BFSL) – Best fit straight line fit through all the calibration points. This is mathematically more complicated, because the results have to be processed to determine the best straight line. Manufacturers often use this method for millivolt output strain gauge type pressure transducers because it produces the best error for marketing purposes and indirectly shows the potential accuracy achievable if the 0 and 2000 psi reading is set to the output at the points on the virtual best straight line.

Terminal Straight Line (TSL) – Straight line drawn between the output at 0 psi and the full scale output at 2000 psi. This method cancels out any zero or span offset error which is often calibrated out when setting up the measurement instrumentation. However it tends to produce errors which are somewhere between method 1 and 2. This method is commonly used with amplified voltage and current output pressure transducers, since the installer can simply set the reading at zero and full scale pressure, and be confident that the transducer readings will be within spec.

Manufacturers do not always explain which method is used, but as mentioned above one would expect it to be TSL, but there is no guarantee, and if there is no obvious clue to which method was used, then the cautious approach is to to use the absolute accuracy method which will produce the largest errors. If it passes then you can assume it will easily pass using either of the other two methods.

Pressure transducer products
  • TK Industrial Pressure Transmitter
  • Low Differential Pressure Transmitters DPS300 User Switchable Pressure Range, Volts or Current Output Low DP Sensor
  • TPFADA Flush Diaphragm Pressure Transmitter TPFADA Flush Diaphragm Pressure Transmitter
  • TPSA Precision High Pressure Transducer TPSA Precision High Pressure Transducer

You can use this tool to calculate the theoretical perfect output for each calibration point to determine the baseline when comparing with the actual readings: 0…2000 psi to 0…5Vdc output calculator.

The fail error of 0.5% FS would be equivalent to 10 psi or 0.025 V at each calibration point.

To ensure you are checking each component of the L. H. R. we would suggest:

Linearity (L) – Check increasing 200 psi increments up to 2000 psi, it is important that each calibration point is taken in one direction.

Hysteresis (H) – Check decreasing 200 psi increments from 2000 psi back down to 0 psi, it is important that these readings are taken following the previous step without releasing the pressure at 2000 psi between the two steps.

Repeatability (R) – Repeat the previous 2 steps for linearity and hysteresis

These are the suggested psi calibration points in order of testing:

  1. 0, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000
  2. 2000, 1800, 1600, 1400, 1200, 1000, 800, 600, 400, 200, 0
  3. Repeat x 2
Pressure transducer products
  • TPSA Precision High Pressure Transducer TPSA Precision High Pressure Transducer
  • TPSA Precision High Pressure Transducer 0-5 Volts Output Pressure Transducers
  • IMP Low Cost Pressure Sensor
  • Low Differential Pressure Transmitters DPS300 User Switchable Pressure Range, Volts or Current Output Low DP Sensor

Primary Sidebar

Pressure Sensor Specifier

Specify a pressure sensor

Select your pressure sensor requirements

Pressure Sensor Types

  • 600 bar, 9000 psi, 60 MPa Pressure Sensors, Transducers & Transmitters
  • 700 bar, 10000 psi, 70 MPa Pressure Sensors, Transducers & Transmitters
  • Steam Pressure Transducers
  • High Speed Pressure Sensors
  • Silicon Pressure Sensors
  • Vacuum Pressure Transducers

Product Selection Guides

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

Help Guides

  • Difference between vented and non-vented water level measurement
  • Symptons and Causes of Damage to Pressure Transducer Diaphragms
  • Pressure Sensor Accuracy Specifications
  • Supply voltage and load resistance considerations for pressure transmitters
  • What is the difference between gauge and absolute pressure measurement
  • Measuring the difference in air pressure between rooms
  • Measuring vacuum with negative gauge or absolute ranges
  • Process Connections
  • Determining water tank volume using hydrostatic pressure
  • What is difference between working, burst and over pressure
  • Advantages and Disadvantages of using a 4 to 20 mA Signal
  • How to Connect a 4-20mA Current Loop Pressure Transmitter
  • Measurement Accuracy
  • Choosing PVC, PUR, FEP and TPE cable types
  • What is the difference between zero offset and zero drift?
  • How do you measure the volume of a liquid using pressure
  • What is the difference between vacuum and absolute pressure
  • What does negative and positive gauge pressure mean
  • Measuring negative pressure using a positive differential pressure range

Product Enquiry

Send us your enquiry for a product associated with this Checking the LHR error of a 0-5 Vdc output pressure transducer page, and get assistance with selecting a product for your application.

Email Your Enquiry

enquiries@sensorsone.com
By clicking "OK" or continuing to use this website you are providing your consent to use cookies as described in our Privacy Policy

© 2023 SensorsONE Ltd, all rights reserved

  • Home
  • Products
  • Tools
  • Legal
  • Contact