Factors to consider when selecting a differential pressure flow meter

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Differential pressure flowmeters are now facing unprecedented challenges. In the measurement of urban natural gas, gas, industrial steam, and various other fluids, as well as for internal cost accounting within various industries, there is an urgent need for measuring instruments that offer a wide range, high precision, and high reliability. Driven by the company’s continuous innovation and research, differential pressure flow meters have achieved successive technological breakthroughs. According to reliable market data, differential pressure flow meters still rank at the top among flow meters thanks to their mature technology, simple structure, lack of moving parts, stability and reliability, as well as wide range of applications. Below is an overview of the development history of differential pressure flowmeters: 1. Integrated differential pressure flowmeters, which combine the throttling device, differential pressure, pressure, temperature, as well as calculation and display functions into a single flowmeter unit. The flow rate can be displayed directly on the gauge, or the instantaneous flow value can be transmitted remotely via a 4-20mA current signal. This is also a true differential pressure flow meter, as it contains all the elements necessary for a flow meter. 　　 　　2. Integrated differential pressure flow transmitter: The differential pressure transmitter is installed directly on the throttling device, and it outputs a 4-20mA electrical signal that represents the magnitude of the differential pressure signal; flow calculation as well as temperature and pressure compensation are carried out by the user separately. To some extent, this configuration cannot be considered a flow meter; at most it serves as a transmitter. However, it is suitable for transmitting signals from the field to the DCS in order to enable control, with the control system performing temperature and pressure compensation to calculate the measured flow rate. 　　 　　3. It is composed of a throttle device, a differential pressure transmitter, a pressure transmitter, a temperature transmitter, and a flow rate calculation display unit. Also known as a split-type differential pressure flow meter. I believe this configuration is familiar to many people. This is the traditional configuration; in the past, differential pressure flow meters were always installed in this way. However, due to the complexity involved, their use has declined significantly in recent years. 　　 　　Next, let’s discuss the key factors taken into consideration when selecting a flowmeter. For a given application, there may be several possible options for instruments. If decisions are made based solely on past experience or by considering only one factor, it is possible to miss the opportunity to choose the most suitable instrument. However, it is not an easy task to propose the optimal solution by taking these factors into account. Based on our years of experience, we would like to offer some suggestions for your reference when choosing a flow meter: 　　　1. Accuracy 　　　2. Range 　　　3. Pressure loss 　　　4. Long-term reliability