A nozzle flow meter:
The nozzle flowmeter is a differential pressure generating device that measures flow. It can measure the flow of various fluids in the pipeline with various differential pressure gauges or differential pressure transmitters. The standard nozzle throttling device is used with the differential pressure transmitter to measure the flow of liquid, steam and gas. It is widely used in petroleum, chemical, metallurgy, electric power, light industry and other departments.
Advantages of the nozzle flowmeter:
1. The standard nozzle has a long history and a large number of various test data.
2. The nozzle flowmeter has simple and firm structure, no moving parts, stable and reliable use for a long time.
3, rich experience in design, manufacturing and application, high degree of standardization, without the need for real-flow calibration.
4. Standard nozzles have reliable experimental data and perfect international and national standards. The measurement data is authentic and can be used as a trade settlement meter.
Disadvantages of nozzle flowmeters:
1. The production is more complicated and the unit price is higher.
2. Flow rate of nozzle flowmeter When the pressure difference between the nozzle and the nozzle is greater than a certain value, the flow rate through the nozzle is a fixed value, and the measurement accuracy level is high;
3, generally used as a standard device.
Second, the orifice flowmeter:
The orifice flowmeter is a high-range differential pressure flow device that combines a standard orifice plate with a multi-parameter differential pressure transmitter (or differential pressure transmission, temperature transmitter and pressure transmitter) to measure gas and steam. , liquid and natural gas flow.
Orifice flowmeter advantages:
1, the cost is higher. Standard orifice plates have a long history, with international and national standards and verification procedures and a large number of test data, without actual flow calibration.
2. The flow measurement of the orifice flowmeter has a certain range, no movable parts, and the price is more affordable;
3. The measurement data is authentic and can be used as a trade settlement measurement table.
Disadvantages of orifice flowmeters:
1. The wear and dirt of the sharp edge of the orifice plate will affect the measurement accuracy.
2. The verification period is shorter than 6-12 months.
3, the pressure loss is large, the large-diameter due to the pressure difference before and after the orifice plate is difficult to accurately measure, resulting in the accuracy of the orifice flowmeter is not high.
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