Water Flow Calibration Device from China Manufacturer - Aister Instrument (Shanghai) Co., Ltd

Introduction Features Specifications Model Selection Application Device composition

Introduction

This water flow standard device is composed of a circulating water pressure stabilizing system, a variable frequency speed regulation system, a standard meter pipeline system, a pipeline system for the inspected meter, a flow regulation system, a reversing system, a weighing system, a computer control system, etc. The device can carry out metrological verification and calibration work for electromagnetic and liquid flow meters. The verification method adopts the static mass method + standard table comparison method (flow range: 0.2-560m³/h).

Features

1.It has the advantages of combining the static mass method with the standard table method, sharing water sources, test pipelines and control systems. It features a simple structure, convenient operation and use, high detection efficiency, and economic practicality.

2.The ratio of the quantity limit is reasonable. Four electronic scales are adopted, making the weighing accuracy of the entire range better than 0.1%.

3.The flow rate is regulated by the combination of a frequency converter and a manual ball valve. Improve the stability of the device and achieve significant energy-saving effects.

4.Pneumatic meter clamps, electrically controlled pneumatic water release valves, and electrically controlled pneumatic reversing devices are adopted (synchronously timing and counting while reversing) to achieve automatic weighing control, computer data processing, and generation of calibration reports. The air source is multiple sets of Roots blowers, which are flexible in combination. Variable frequency control saves operating costs.

Specifications

Performance	Technical parameter
Testable instrument diameters	DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN125, DN150, DN200; (Optional range: DN10-DN800)
Flow range	0.2-560m³/h
Pipeline arrangement for calibration straight pipe sections	DN25-DN200 flat-laid structure, one instrument is tested each time
Device uncertainty	(K=2); A. Weighing method: better than 0.05%; B. Standard Table method: 0.2%; C. Flow stability: ≤0.3%
Commutator stroke difference	≤20ms (within the range stipulated by the state)
Minimum calibration time	30 seconds; When the maximum diameter gauge shows a flow rate of 5m/s, the flow should meet the 30-second verification requirement
Standard instrument	Composed of a medium-precision electronic scale and an electromagnetic flowmeter. As a first-level standard, the medium-precision electronic scale can not only verify the flowmeter under inspection but also perform online calibration on the standard meter online. Meanwhile, the standard meter adopts an electromagnetic flowmeter with an accuracy better than 0.2% and a repeatability better than 0.066% as the secondary standard. By adopting a parallel combination of multiple units, a large diameter can be used for verification at high flow rates, and a small flowmeter can be used for verification at low flow rates, which improves the verification accuracy and makes the verification process convenient and fast
Data acquisition and control system	It is composed of an industrial control computer, signal isolation components, signal conditioning components, input/output control components, storage devices and printing devices, as well as dedicated verification software
The system can collect the types of signals processed by the calibrated instrument	pulse, current (analog quantity), serial digital communication (specific manufacturer required)
Verifiable meter types	electromagnetic flowmeter, ultrasonic flowmeter, liquid vortex flowmeter, liquid turbine flowmeter, Coriolis mass flowmeter, etc
Supply power to the inspected meter	DC24V
Total system power	≤45KW
Equipment external dimensions	Designed based on the site map provided by the user

Model Selection

Standard meter: The minimum standard meter should have the same minimum diameter as the meter under inspection, while the maximum standard meter should have the same or a smaller maximum diameter as the meter under inspection. A matching diameter should be selected between the maximum and the minimum, and the upper and lower limits of the flow rate should be able to connect.

Measuring instrument: For the maximum flow rate per minute of the largest diameter, choose a large measuring instrument; for the minimum flow rate per hour of the smallest diameter, choose the smallest container. If a mother-child meter needs to be marked, add a small measuring instrument.

Pressure stabilizing tank: Choose the larger one over the smaller one. For small devices (within 50), generally multiply by 2 for the largest container. For large devices (100), multiply by 1.5 appropriately. For (150), multiply by 1 or 1.2. For (200-300), multiply by 0.5.

Water pump: Multiply the maximum flow rate of the inspected meter by 1.3 times.

Frequency converter: It is matched according to the power of the water pump motor.

Water tank: It is greater than the sum of the pressure stabilizing tank and the metering device.

Application

Industrial process

Energy measurement

Environmental protection engineering

Transportation

Biotechnology

Scientific experiment

Marine meteorology

Rivers and lakes

Device composition

This device is divided into five parts, namely the Control system, Checked meter system, Steady flow system, the power source system and the standard source system.

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