Environmental Laboratory

  • Patented Temperature Compensation for Pressure/Level Transducers

Patented Temperature Compensation for Pressure/Level Transducers

Oct 10 2018 Read 785 Times

Ideally, a pressure transducer would respond only to pressure. In reality, we know pressure readings can vary as temperature changes. Additionally, each individual transducer introduces variations of its own.

To combat these discrepancies, Seametrics has developed a patented compensation technique: “Digitally Temperature Compensated Strain-Gauge Pressure Measuring Apparatus” that is used on the entire line of Seametrics pressure transducers.

Before leaving the factory, each sensor is individually calibrated. Using a high precision environmental chamber, numerous sample measurements are taken at 5°C, 20°C, and 35°C at both zero and full-scale pressures. Six calibration parameters are determined from this sample data, three for offset and three for slope. Offset and slope errors are defined as second order functions of temperature.

Parameters for both are determined by least squares fit of data for known temperature and known pressure samples. These parameters are then stored in memory on each individual Smart Sensor.

During operation, uncompensated temperature and pressure data is collected and stored in the sensor memory. When data is retrieved from the sensor, the calibration parameters are also retrieved. The retrieving program, typically our Aqua4Plus2.0 control software, then applies the calibration parameters before displaying the data for export. The resultant data is highly accurate – each data point having been individually adjusted to compensate for temperature variations and individual characteristics of the particular sensor.

In addition to the unparalleled accuracy that Seametrics Smart Sensors offer, they’re also the only line of non-disposable, eco-friendly sensors on the market. With replaceable batteries, field serviceable cables, and modular, rebuildable sensor construction, they’re designed to minimise environmental and budgetary waste.

Reader comments

Do you like or dislike what you have read? Why not post a comment to tell others / the manufacturer and our Editor what you think. To leave comments please complete the form below. Providing the content is approved, your comment will be on screen in less than 24 hours. Leaving comments on product information and articles can assist with future editorial and article content. Post questions, thoughts or simply whether you like the content.

Post a Comment




Digital Edition

Asian Environmental Technology May 2019

May 2019

In This Editon Business News - Measuring the methane component of GHG emissions - Blackline Safety reports strongest quarter ever with revenue up 64% - Restek and LECO collaborate in worldw...

View all digital editions

Events

PEFTEC 2019

May 22 2019 Rotterdam, Netherlands

SETAC Europe

May 26 2019 Helsinki, Finland

Caspian Power

May 29 2019 Baku, Azerbaijan

ASMS Conference

Jun 02 2019 Atlanta, GA, USA

Aquatech China 2019

Jun 03 2019 Shanghai, China

View all events