Requirement of Turbine Flowmeter for Medium

2021-03-02
  Requirement of Turbine Flowmeter for measuring medium
 
 
 
1.Turbine flowmeters are generally only used to measure clean media 
 
The bearings of most turbine flowmeters are spherical bearings, so there are high requirements for the cleanliness of the measured medium. 
If the medium contains particulate impurities, it will cause the be aring to wear quickly.
If there are fiber impurities, they will be entangled 
on the turbine blades and affect the normal rotation of the turbine. In practical applications, an effective filter should be installed upstream 
of the turbine flowmeter.
 
2. Generally only used for low-viscosity single-phase fluids
Through practical application and verification, 
when the turbine flowmeter is measuring low-viscosity media, its meter coefficient hardly changes with the change of flow rate. 
When the viscosity of the measured medium increases, the linearity of the turbine flowmeter will become very poor. 
The meter coefficient will also change greatly with the change of the flow rate, and it is difficult to achieve the due measurement accuracy. 
When the measured medium is a gas-liquid two-phase flow, the flow rate of the medium will become very unstable, resulting in a large measurement error.
 
 
3. The medium fluid measured by the turbine flowmeter should be in a turbulent state
According to the flow characteristics of the turbine flowmeter, 
when the medium is in a laminar flow state, the meter coefficient changes greatly with the change of the flow. When the medium is in a turbulent state, 
the meter coefficient hardly changes with the change of the flow. In order to ensure the measurement accuracy of the turbine flowmeter,
 the measured medium should be in a turbulent state

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