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Turbine flow meter model selection

2021-06-03
 Turbine flow meter model selection

1. According to the requirements of measurement purposes:

Requires selection of instantaneous flow or cumulative flow (cumulative flow), flow display unit, measurement accuracy, repeatability, linearity, flow range and range, measurement temperature, pressure loss, temperature and pressure compensation, output signal characteristics and response time Wait. Different measurement objects have their own measurement purposes, and they have different focuses in terms of instrument performance.

2. Requirement of measuring medium properties:

Chemical corrosion and fouling, and fluid chemistry sometimes become the decisive factor in choosing measurement methods and instruments. Certain fluids can cause corrosion of the instrument contact parts, surface scaling or precipitation of crystals on the metal surface to produce electrolytic chemistry.

3. Requirements for measuring the phase of the medium:

Care should be taken when measuring multi-phase and multi-component flows depending on whether the measuring medium is a single phase change medium or measuring multi-phase and multi-component flows. Turbine flowmeter measures single clean medium, electromagnetic flowmeter can measure solid-liquid two-phase mixed medium, etc.

4. Compression system and other parameter requirements:

The measured gas needs to know the compressibility value to obtain the fluid density under working conditions. The density of fluids with a fixed composition is calculated by pressure, temperature and compressibility; fluids with variable composition and working close to (or in) the supercritical region should consider online density measurement.

5. Measurement accuracy requirements:

It is necessary to clarify the overall measurement accuracy requirements and whether it is used under a certain flow rate or within a certain amount range due to temperature and pressure changes. The value is generally low, and the difference between various gases is small. . The commonly used accuracy grades of smart liquid turbine flowmeters are 1.0 and 0.5. This accuracy grade is higher than that of general rotor type flowmeters. It is a good choice for customers with higher accuracy requirements.



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