Liquid Flow Meter Calibrations with the 0.1 L/s and the 2.5 L/s Piston Provers

Pope, Jodie G.; Wright, John D.; Johnson, Aaron N.; Crowley, Catherine

doi:10.6028/nist.sp.250-1039r1

Cited by 6 publications

(7 citation statements)

References 5 publications

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“…When a linear encoder is connected to the piston, many pulses are output while the piston moves [13]. The characteristics of piston provers are expected to be essentially linear with respect to the flow rate.…”

Section: Considered Calibration Methods For Low Flow Ratementioning

confidence: 99%

Liquid low-flow calibration rig using syringe pump and weighing tank system

Doihara

Shimada

Cheong

et al. 2016

Flow Measurement and Instrumentation

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Section: Considered Calibration Methods For Low Flow Ratementioning

confidence: 99%

Liquid low-flow calibration rig using syringe pump and weighing tank system

Doihara

Shimada

Cheong

et al. 2016

Flow Measurement and Instrumentation

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“…We compared the 15 kg/s LFS to two of NIST's previously documented liquid flow standards: the 65 kg/s dynamic gravimetric standard [22] and the 2.5 L/s piston prover [23]. Figure 6 shows the results of the comparisons using 5 cm and 2.5 cm Coriolis mass flow meters as transfer standards.…”

Section: Comparison To Nist's Existing Liquid Flow Standardsmentioning

confidence: 99%

“…(The water's temperature increased by less than 0.05 K.) We compared the integrated output of the Coriolis meter to the buoyancy-corrected weigh scale readings, Eqn. (23). In effect, this was a calibration of the Coriolis meter.…”

Section: Dynamic Response and Load Dependence Of The Weigh Scalementioning

confidence: 99%

LIQUID FLOW METER CALIBRATIONS WITH NIST’s 15 kg/s Water FLOW STANDARD

Pope¹,

Johnson²,

Filla³

et al. 2021

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We describe the 15 kg/s water flow calibration standard operated by the Fluid Metrology Group of the National Institute of Standards and Technology (NIST) to calibrate liquid flow meters for customers. The 15 kg/s standard is a dynamic, gravimetric, liquid flow standard (LFS) that determines flow by measuring the rate of change of the mass of water accumulating in a collection tank. The LFS is a fully automated system that uses two proportional-integral-derivative control loops to achieve water flows near ambient temperature with a mass flow stability that is the smaller of 0.001 % of the mass flow set point or 0.1 kg/s. The expanded uncertainty of the LFS is 0.022 % for mass flow and 0.023 % for volume flow for the flow range 0.22 kg/s to 15 kg/s. (Unless stated otherwise, all uncertainties have a 95 % confidence level.) When the LFS is used to calibrate a customer's meter, the uncertainty of the meter factor is increased by the irreproducibility of the meter under test (MUT). The most reproducible meters tested by NIST have meter-factor uncertainties of 0.035 % and 0.036 % for mass flow and volume flow, respectively. Below, we derive the equation for calculating flow at the meter under test, analyze the uncertainty of the flow standard, give supporting data, and provide a sample calibration report. This document also describes the procedures that customers must follow to submit their flow meters to NIST for calibration.

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“…This device had a large equipment volume and complex design, making it inconvenient for calibration work. The NIST [12] also created a passive piston-type flow standard device with a flow range of 0.003-0.1 L/s and an expanded uncertainty of ±0.044%. During the same period, NIST developed an active piston-type flow standard device with a flow range of 0.02-2 L/s and an expanded uncertainty of ±0.064% for measuring mixtures of propylene glycol and water.…”

Section: Introductionmentioning

confidence: 99%

Automatic Piston-Type Flow Standard Device Calibration System

Song,

Wang,

2023

Mathematics

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Measurement of flow is crucial for assuring product quality, increasing manufacturing effectiveness, and promoting the development of science and technology. With the advancement of calibration and automation, standard devices using the mass method, volumetric method, and master meter method have limitations, such as low calibration efficiency and automation, large size, and complex operation. Innovations in this area are desperately needed. To realize the automation of calibrating ultrasonic water meters, a piston-type flow standard device calibration system with a high degree of automation, high calibration efficiency, small size, and easy operation was designed. A piston-type flow standard device was designed, the standard device was modeled, the selection of the main hardware and the design of the automated control of the hardware parts were completed; an automation control system adapted to the flow standard device was developed; and, furthermore, a water meter flow point calibration algorithm integrating the start–stop method and the dual-time method, as well as a water meter flow correction algorithm, was devised to improve the efficiency of ultrasonic water meter calibration. An uncertainty assessment of the designed system was completed; the standard uncertainty and expanded uncertainty of the device were 0.013% and 0.026%. Meanwhile, flow calibration tests were conducted, validating the rationality of the automated calibration algorithm for ultrasonic water meters. The results show that ultrasonic water meters calibrated with flow correction have a flow error within ±3% in the “low flow range” and within ±2% in the “high flow range”, with a repeatability of less than 0.05%. This indicates that a piston-type flow standard device, coupled with an automation calibration control system, can efficiently, accurately, and conveniently perform water meter calibration, and the system has good practical value.

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Liquid Flow Meter Calibrations with the 0.1 L/s and the 2.5 L/s Piston Provers

Cited by 6 publications

References 5 publications

Liquid low-flow calibration rig using syringe pump and weighing tank system

Liquid low-flow calibration rig using syringe pump and weighing tank system

LIQUID FLOW METER CALIBRATIONS WITH NIST’s 15 kg/s Water FLOW STANDARD

Automatic Piston-Type Flow Standard Device Calibration System

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