Which method provides better accuracy? Non-linearity as the End Point Method is the relationship of the calibration curve to a specified straight line through its endpoints (i.e. Zero and Full Scale). Best Fit Straight Line (BFSL) method is the relationship of the calibration curve to a calculated straight line that minimizes the error but does not pass through the end points. BFSL method effectively cuts the end point value in half.
September 10, 2015
Barometric altimeters calculate and display altitude by measuring the local barometric pressure and converting that measurement into altitude. This conversion is done using the Standard Atmosphere Table, an international standard representing the barometric pressure at various altitudes on a so-called "standard day" which assumes a consistent non-linear relationship between altitude and pressure. Barometric pressure is used in absolute pressure datums to ensure repeatable measurement
Using temperature stand-offs can replace expensive high temperature pressure sensors.
When selecting a pressure transducer for monitoring high temperature liquids or gases, be sure to note the operating temperature range of the transducer. This specification is included under environmental data on most manufacturers’ data sheets. The temperature compensated range specification of a transducer is the error introduced as temperature increases or decreases from 70°F. This thermal error affects both the span and zero setting of the transducers analog output and is generally listed as a percent of full scale per degree (% FS/°F). The static accuracy (accuracy at 70°F) of the pressure transducer plus the thermal error introduced by a high temperature pressure source is the total possible error for a specific high temperature pressure measurement
Apprenticeship Programs: The Solution For More Skilled Workers
A shortage in skilled labor is a serious issue in United States'
manufacturing industry. Why? There's a misconception of what kind of training someone needs to have in order to enter professions within this industry. Many begin to build their skills through trade school before becoming a manufacturing professional. These students don't always get the proper hands-on training that can truly prepare them for the complex world of manufacturing Yet with these schools, there's still the perception that traditional degrees have more long-term value than vocation training.
April 28, 2015
Thin Film Technology Strain Gauge
Thin film pressure transducers are made by vapor deposition or sputtering of insulation and strain gauge elements directly on a polished pressure sensing diaphragm or beam. The desired strain gauge pattern is deposited either by masking the non-conductive areas or by etching away unwanted conductive material. Laser trimming is used to calibrate the resistive elements.
April 23, 2015
Many of the following technical specifications appear on datasheets for pressure transducers and similar devices. Here we review their technical definitions and relationships.
Root Sum Squares (RSS): accuracy of a pressure transducer is calculated by taking the square root of non-linearity + hysteresis + non-repeatability.
March 12, 2015
Pounds per square inch (PSI) is a common unit of pressure used in many different pressure measuring applications. It’s typically used for non-SI industrial and technical purposes such as tire pressure, fuel storage & distribution, waste water management, and test & measurement activities, among many others.
October 14, 2014
Industrial pressure transducers are used in a wide variety of applications ranging from HVAC/R compressors, refrigeration and variable speed pumps to hydraulic pressure, oil and water. A transducer can be used anywhere there's a pipeline or chamber, its function is to sense and convert pressures into a proportional electrical output signal that is transmitted to monitoring or control system.
September 10, 2014
With different equipment comes different air pressure testing techniques for measurement. But are you sure if your procedures up to date? This article breaks down specifically what methods need to be implemented for different scenarios. These new steps in calculating