Diesel fuel flow meter detector is no moving parts and seals, theoretically from the measured media process temperature, pressure and the influence of process parameters such as density, but in practice, we found that the accuracy is not only affected by the process conditions of measured medium, even span ratio, the vibration of the external environment, also can cause a deviation measurement results.
Process temperature of diesel flow meter accuracy of coriolis force the influence of the quality of diesel oil flowmeter
flow measurement principle is based on the following formula: type: Qm for mass flow;
K for the torsional elastic modulus of the sensor pipe;
T around for sensing the lag;
R around for sensing tube radius.
When the K, r is constant, Qm and only time & Delta;
T is proportional to the.
However with metal elastic change the young's modulus of elasticity is a function of temperature.
When the temperature changes, the rigidity of the sensor pipe changes - K is no longer a constant, which affect the accuracy of the diesel fuel flow meter;
When the temperature changes, also will cause the sensor geometry structure imbalance, thus affect the diesel flow meter zero stability.
When traffic is bigger, process temperature change on the influence of the flow measurement accuracy is not very big.
As for CMF200 type, when the rated flow, only affect the accuracy of every change 1 degree & plusmn;
But the flow is small, processing temperature effect on the accuracy can not be ignored.
The influence of process pressure on diesel fuel flow meter accuracy from formula (
We know that when r is about sensing tube radius change, will also affect the diesel oil flowmeter measurement accuracy.
In practice, we know that the sensing tube is an elastic element, general tube wall is thin, when the pressure increases, the r value will also along with the increase, thus affecting accuracy.
As shown in figure 2.
From figure 2, we can see that the pressure effect on the measurement accuracy: when the process pressure, flow meter causes a negative deviation, smaller value than the actual value of flow;
When pressure is reduced, can make the flowmeter to create a positive deviation, characterized by flow display value than the actual value is larger.
Another aspect, when the process pressure is equal to or lower than the temperature of the liquid saturation vapour pressure, the cavitation phenomenon occurs, sensing tube wall metal surface due to fatigue damage, affecting the accuracy of diesel flow meter and longevity.
Medium density of diesel flow meter accuracy generally considered the influence of coriolis force diesel flow meter is not affected by the density of medium technology, but a large number of accurate experimental data and theoretical analysis show that is not the case.
Power for coriolis flowmeter, when calibration and measurement is a medium of different density, the influence of the density exists.
When verification of diesel by liquid flow meter used to measure gas, caused by the error is quite large, experience has shown that when density varied from 500 kg/m3 is changed to 1000 kg/m3, the impact on the accuracy reaches 0.
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