FOXBORO P92 P9220436070H H92 controller module

FOXBORO P92 P9220436070H H92 controller module

Technical data of product parameters

NIST operates the LFSs as close as practical to these idealized conditions with the exception of the operating pressure.
Steady flow conditions are obtained by using a tuned PID control to run the piston at a nearly constant velocity during
data collection. Temperature uniformity of the fluid in the LFS assembly is established by cycling the piston back and P92 P9220436070H H92
forth until the multiple temperature sensors distributed throughout the test section and the 2 temperature sensors located at
the left and right exits of the piston-cylinder assembly agree to within 0.5 C or better. The room housing the LFS is
maintained to within ± 1 ºC of the reference temperature to minimize heat transfer effects. The pressure is maintained
slightly above Pref (i.e., 200 kPa or more, Pref = 101.325 kPa) to prevent measurement errors and possible damage caused
by cavitation to customer turbine meters. Pressure and temperature differences between the fluid exiting the cylinder and the fluid at the MUT cause the volumetric P92 P9220436070H H92
flow at these two locations to differ. These gradient effects are caused by pressure loss mechanisms such as wall friction,
elbows, fittings, etc., as well as by heat transfer caused by temperature differences between the fluid and the room.
Gradient effects are corrected by measuring the temperature and pressure at the cylinder exit and at the MUT. The
measured temperatures and pressures are used in Equation (4) to calculate the density at the cylinder exit (cyl) and at theA third type of non-ideality results from mass storage effects in the connecting volume between the swept cylinder P92 P9220436070H H92
volume and the MUT. For example, if the temperature of the fluid in the connecting volume drops between the start and
stop of the averaging period, the density of the fluid in the connecting volume increases giving so -called mass storage
there. In this case, the mass flow exiting the cylinder is greater than the mass flow reaching the MUT.g NIST corrects for
mass storage effects in the 0.1 L/s LFS from known temperature changes during a measurement, but not for pressure
changes. However, for each calibration we estimate the magnitude of these pressure effects and include them in the
uncertainty budget. The mass storage effects are fully corrected for in the 2.5 L/s LFS. For both of NIST’s LFSs, these
corrections are < 4.3 parts in 106
. low calculations. Nevertheless, these correction factors have been retained to provide guidance for applications when
operating conditions cannot be maintained close to the reference conditions. For example, some operators of piston
provers vary fluid properties by changing fluid (and prover) temperature. For clarity, we specify correction factors that
can be neglected when using Equations (9a) and (9b) for room temperature applications in the remaining sections of the
manuscript

Product picture display

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