Explosion proof gas vortex flowmeter | Working principle of gas vortex flowmeter

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What is the "range ratio" of a flowmeter? How to determine the range of vortex flowmeter?

The "range ratio" of a flowmeter refers to the ratio of the maximum flow rate value to the minimum flow rate value that the flowmeter can measure, also known as the range, while meeting the measurement performance requirements. The determination of the range of a vortex flowmeter requires comprehensive consideration of the instrument model, fluid properties, pipeline size and shape, actual flow requirements, and other factors.

1. Definition of "Range Ratio" for Flow Meter Engineering Practice Definition: Range ratio is the ratio of the maximum flow rate to the minimum flow rate that can be measured by a flow meter when the measurement performance requirements are met (such as the indication error not exceeding the maximum allowable error).

. This definition is consistent with the national standard GB/T 25922-2010. Function: The range ratio provides a basis for the initial selection of flow meter types, and the range ratio of different types of flow meters varies greatly.

2. Method for determining the range of vortex flowmeter 1 Instrument model differences: Different models of vortex flowmeters have different measurement ranges and accuracies. For example, the Hesheng Measurement and Control LUB series vortex flowmeter significantly improves measurement stability by accurately controlling the sensor probe signal output and using DSP technology to capture vortex signals in low flow areas, with a range ratio of up to 1:35. Reference basis: The instrument manual or technical manual will provide detailed range and accuracy information. Users can choose the appropriate model according to their actual needs. F

luid properties: Gas flow range: When measuring gas with a vortex flowmeter, the upper limit flow rate is generally not affected by medium pressure and temperature, but the flow range mainly depends on the working density and kinematic viscosity of the medium. Liquids and vapors: For liquids and vapors, the appropriate range should be selected based on the specific characteristics of the medium (such as density, viscosity, etc.). 3. Pipeline size and shape. Pipeline diameter: A larger pipeline diameter usually increases the upper limit of the range. For example, under the same flow conditions, the flow velocity of a large-diameter pipeline is lower, but the vortex flowmeter can still accurately measure it. The shape of a pipeline (such as bends, valves, etc.) may affect the fluid flow state, thereby affecting the measurement effect. Therefore, when selecting the measuring range, it is necessary to fully consider the actual size and shape of the pipeline. 4. The minimum and maximum flow values required for actual flow are included: by analyzing factors such as process flow, equipment specifications, and fluid characteristics, the minimum and maximum flow values that need to be measured are determined. Range coverage: Ensure that the range of the selected vortex flowmeter can cover the actual flow requirements to ensure measurement accuracy and reliability. For example, if the actual flow range is 10-100 m ³/h, a vortex flowmeter with a range of at least 1:10 should be selected. Output signal type: Select the appropriate output signal type (such as 4-20mA, pulse signal, etc.) according to the requirements of the subsequent equipment or system. Explosion proof level and protection level: When used in flammable, explosive or

Explosion proof gas vortex flowmeter | Working principle of gas vortex flowmeter

What is the "range ratio" of a flowmeter? How to determine the range of vortex flowmeter?

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