Turbine flowmeters handle large pressure range
A
Cox Instruments product story
Edited by the Engineeringtalk editorial team
Feb 7, 2008
Cox precision turbine meters provide a linear extended range from 15:1 on small meters, ranging up to 100:1 on 2in meters, without the use of linearising electronics.
Cox Instruments has released the HP precision turbine flowmeter.
Available in a wide range of sizes and featuring MS33514 end-fittings, the HP series is a rugged meter designed for demanding, high-pressure applications.
The HP series turbine flowmeter performs accurate liquid flow measurements across a wide flow range.
The meter is rated for pressures up to 345bar (continuous), 517bar (proof) and 1724bar (burst).
It offers accuracy of +0.25% of reading and response time of 2-3ms or faster.
All HP series flowmeter calibrations are directly traceable to standards established by the National Institute of Standards and Technology (NIST).
With standard K-factor (10:1 flow ratio) calibration, the meter provides a frequency output linear to within +/-0.5% over the entire flow range.
With special calibration, +/-0.5% linearity can be achieved at any one viscosity up to the meter's linear viscosity limit.
At higher viscosities, the output is nonlinear, but repeatable.
Standard K-ranges for the HP series are available from 0.95-9.5 to 94.5-945 litres a minute, depending upon meter size.
Standard constant K-Factor calibrations are available on MIL-C-7024C, Type 2, at 27C only.
With 20-point loop calibrations (10 points upscale and 10 points downscale), +/-0.5% linearity over extended flow ranges is available on fluids where viscosity does not exceed 1.26 centistokes.
Standard extended ranges, using carrier pickoffs, are available in all sizes from 0.76-11.35 (HPC8-4) up to 11.3-1173 (HPC 32) litres a minute.
Cox precision turbine meters provide a linear extended range from 15:1 on small meters, ranging up to 100:1 on 2in meters, without the use of linearising electronics.
This performance is achieved through a precision helical rotor design, proper use of rotor supports and minimal bearing friction.
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