More accuracy for pressure calibration
A
Sira product story
Edited by the Engineeringtalk editorial team
Oct 30, 2002
Sira Test and Certification is now able to offer further reduced measurement uncertainties under its Gold Service for pressure balances.
Sira Test and Certification is now able to offer further reduced measurement uncertainties under its Gold Service for pressure balances.
A full range of services are available at Sira's headquarters in Chislehurst, Kent, in the company's independent UKAS accredited laboratory.
Sira offers 3 classes of accuracy in pressure balance calibration, provided by staff with an in-depth knowledge of industrial calibration and instrumentation.
Gold Service (mass and effective area) involves weighing the piston and each weight to an uncertainty of approximately 8ppm (or less if required).
The effective area of the piston assembly is determined by direct comparison with a pressure balance, calibrated at a National Standards laboratory, yielding an uncertainty of the effective area measurement which is usually less than 50ppm.
Typically, the calibrated range of the instrument is 90-95% of the working range.
Silver Service (standard service) calibrates instruments in a similar way to the 50ppm mass and effective area service.
The uncertainty of the principal measured pressures is around 100ppm (up to 20,000lb/in2) increasing to 250ppm (up to 60,000lb/in2).
Finally in Bronze Service (five-point calibration), the pressure generated by the pressure balance is measured at five points across each range with an uncertainty of around 200ppm.
Sira is able to calibrate all makes of equipment, including dual and single piston oil operated pressure balances up to 4100bar.
Sira can also calibrate single, dual and triple piston gas operated pressure balances up to 400bar.
Sira also offers repair services as well as training courses in several areas of calibration.
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