Combined with flow calculator to form a multi-range flowmeter

The differential pressure flowmeter is still the most widely used flowmeter, but it has a small range and cannot meet the requirements. It is extremely convenient for maintenance and calibration. Find many measurement objects with a wide range of degrees. For example, there are many heat users in northern my country who use heating equipment as the main heat-consuming equipment, and the heat consumption in summer is often lower than 1/5 of the heat consumption in winter. , then only the error of the differential pressure transmitter will bring unacceptable system errors to the summer measurement, so many units use multi-range flowmeters. Like the example above, high range is used in winter and low range is used in summer. Now there are a variety of intelligent differential pressure transmitters that can use communication methods to change their ranges. Some transmitters have a range adjustable ratio of up to 40 times, which creates good conditions for the realization of multi-range flowmeters. In the dual-range differential pressure flowmeter shown in Figure 10.2, the two connecting lines between the flow calculator and the differential pressure transmitter are both the transmitter power line and the 4〜20 IX! Eight analog signal transmission lines simultaneously bear^eight&Transmission ±0.5 in communication:! ! Eight digital signal tasks. The flow calculus is set with a high-range flow upper limit 9^ and a low-range flow upper limit ^, and is respectively connected to the high-low range difference dual-range differential pressure flowmeter circuit of the differential pressure transmitter. ^ corresponds to 厶^^. There is also a high and low range flow switching value 9^ set in the calculator. When the differential pressure transmitter is in the high range state, the calculator uses 9^ to participate in the calculation of the flow rate. If the calculated flow value is less than or equal to 9^, the calculator makes a switch To the decision of the low range, and according to the designed program, use the communication method to switch the differential pressure transmitter to the low range, and start to use ^ to participate in the calculation of the flow. In the future, if the flow value is greater than that, the communication method will be used to switch the differential pressure transmitter back to the high range. In the actual implementation, a switching difference is generally set to prevent frequent switching between high and low ranges. Moreover, the Reynolds number correction at low flow rate needs to be considered to ensure the measurement accuracy. Related knowledge: How to use a flowmeter to measure dry gas flow? How to calibrate the differential pressure flowmeter

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