The working principle of the turbine flowmeter

The turbine flowmeter has a turbine, which needs to be installed in the fluid pipeline when used, and both ends are supported by bearings. When the fluid passes through the turbine, the fluid impacts the turbine blades, causing the turbine blades to rotate. The measuring instrument of the turbine flowmeter indirectly measures the flow rate through the angular velocity of the turbine blades. The method used is that the angular velocity of the blades is proportional to the fluid speed.

The angular velocity is detected through the sensing coil installed in the casing. When the turbine blades cut the magnetic lines generated by the permanent magnet steel in the casing, the magnetic flux of the sensing coil changes. The sensing coil sends the detected magnetic flux periodic change signal to the amplifier of the measuring instrument, which amplifies and shapes the signal.

Generate a pulse signal proportional to the flow rate, and send it to the unit conversion and flowmeter accumulation circuit to obtain and display the cumulative flow value; at the same time, the pulse signal is also sent to the frequency and current conversion circuit to convert the pulse signal into Simulates the amount of current and indicates the instantaneous flow value.

Extended information:

Notes

1. Precision function inspection

Accuracy level and function should be selected according to the measurement requirements and usage occasions. Accuracy level, economical and cost-effective. For example, when used for trade settlement, product handover and energy measurement, a higher accuracy level should be selected, such as level 1.0, 0.5, or higher; when used for process control, different accuracy levels should be selected according to control requirements.

In some cases where it is just to detect the process flow without precise control and measurement, you can choose a slightly lower accuracy level, such as level 1.5, level 2.5, or even level 4.0. In this case, you can choose a low-priced Insertion Turbine Flow Meter.

2. Measurable media

When measuring the medium flow rate, instrument range and caliber when measuring general media, the full-scale flow rate of the turbine flowmeter can be measured at a medium flow rate of 0.5-12m/ Select within s range, the range is relatively wide. The selection of instrument specifications (diameter) is not necessarily the same as that of the process pipeline, and should be determined based on whether the measured flow range is within the flow rate range.

That is, when the flow rate in the pipeline is too low to meet the requirements of the flow meter or the measurement accuracy cannot be guaranteed at this flow rate, it is necessary to reduce the diameter of the instrument to reduce the flow rate in the pipe and obtain satisfactory measurement results.

Baidu Encyclopedia - Turbine Flowmeter