Innovative differential piston gauge

Citation

(2008), "Innovative differential piston gauge", Aircraft Engineering and Aerospace Technology, Vol. 80 No. 1. https://doi.org/10.1108/aeat.2008.12780aad.023

Innovative differential piston gauge

Innovative differential piston gauge

GE Sensing introduces its Ruska Model 2482 differential piston gauge in response to a market demand for an accurate and easy-to-use differential pressure standard for use at high-static line pressures. Featuring a patented triple-piston assembly, the Ruska 2482 is designed to calibrate virtually any differential pressure sensing device from 0 to 2,100 mbar (850 inH20) at line pressures up to 200 bar (2,900psi). It is thought to be ideally suited as a calibrating instrument for a wide range of applications requiring best-possible accuracy at high-line pressures, such as the calibration of pressure transmitters used in custody transfer measurements in the oil industry and turbine efficiency testing in the aerospace and power generation sectors.

Despite the fact that the accuracy of pressure transmitters is dependent on line pressure, few devices are calibrated at elevated line pressure due to the associated costs and complexity of traditional twin post calibration standards. In traditional systems, minute load adjustments are required to establish zero differential at each line pressure. This elaborate zeroing process is eliminated in the Model 2482 through the use of a precision load cell, actually a digital force balance. The load cell supports the weight of the differential piston and serves as a null indicator to ensure the line pressure balance point. It also provides feedback to an active control system so that the differential pressure produced is maintained when changing the mass load. A particular feature of the calibration process is that the effective area of the triple-piston assembly is not affected by the line pressure. This simplifies operation of the instrument by minimizing the computations needed for accurate results and significantly contributes to a reduced uncertainty in output pressure.

The innovative Model 2482 can reportedly be used to calibrate virtually any hydraulic or pneumatic pressure device, including other industrial or portable piston gauges, transducers, transmitters, gauges or pressure switches. It offers an exceptional accuracy of 40ppm of reading +0.0013psi and its windows- based menu-driven software both controls the piston gauge and provides the full range of necessary corrections and calculations.

Details available from: GE Sensing, Tel: +1 978 437 1410, E-mail: lindsay.theile@ge.com, web site: www.gesensing.com