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Open channel flowmeter precautions
The open channel flow meter, also known as the sewage open channel flow meter, is a common liquid flow measuring instrument. Widely used in urban sewage treatment, water quality and environmental quality testing, petroleum, pharmaceutical, chemical, agricultural and other industries. Because the ultrasonic open channel flowmeter adopts the non-contact measurement method, it can adapt to a variety of complicated working conditions. The feasibility of measuring high temperature, high viscosity, strong corrosive and other special media will also be greatly improved.
Precautions:
1. Accuracy class and function According to the measurement requirements and the use occasions, the instrument accuracy level is selected to achieve economical cost. For example, in the case of trade settlement, product handover and energy measurement, the accuracy level should be higher, such as 1.0, 0.5, or higher; for process control, select different accuracy levels according to control requirements; It is to detect the process flow, no need to do precise control and measurement, you can choose a lower accuracy level, such as 1.5, 2.5, or even 4.0, then you can use a low-cost plug-in open channel flowmeter.
2. When measuring the medium flow rate, meter range and caliber measurement of the general medium, the full flow of the open channel flowmeter can be selected within the range of 0.5-12 m/s of the measured medium flow rate, and the range is relatively wide. The meter specification (caliber) is not necessarily the same as the process pipeline. It should be determined whether the measured flow range is within the flow rate range. That is, when the pipeline flow rate is too low to meet the flow meter requirements or the measurement accuracy cannot be guaranteed at this flow rate, It is necessary to reduce the gauge diameter, thereby increasing the flow rate inside the tube and obtaining satisfactory measurement results.
3. Fluid characteristics mainly refer to gas pressure, temperature, density, viscosity, compressibility, etc. Since the volume of gas varies with temperature and pressure, it should be considered whether compensation should be compensated.
4. Instrument performance refers to the accuracy, repeatability, linearity, range ratio, pressure loss, initial flow, output signal and response time of the instrument. When selecting the flowmeter, the above indicators should be carefully analyzed and compared, and the flow rate of the metering medium can be selected. Required instrument.
5. Installation conditions refer to gas flow direction, pipeline direction, length of upstream and downstream straight pipelines, pipe diameter, space location and pipe fittings, etc., which will affect the accurate operation, maintenance and service life of gas gas flowmeters.
6. Economic factors refer to the purchase cost, installation fee, maintenance fee, calibration fee and spare parts, which are affected by the performance, reliability and life of the gas gas flow meter.