There are many types of water meters. Water meters are mainly divided into mechanical water meters and electronic water meters. Mechanical water meters are commonly known as small meters, mainly including rotor water meters, screw wing water meters and volumetric water meters; Electronic water meters, also known as large meters, are mainly divided into electromagnetic water meters, ultrasonic water meters and jet water meters. With the continuous development of the water meter industry, the advantages of electronic water meters continue to emerge. Its flow sensing technology is more excellent and advanced. Compared with traditional mechanical water meters, electronic water meters are developing rapidly in the current intelligent water meters. It changes the problem that the error curve of the mechanical water meter is difficult to correct, and solves the problem of wear in long-term application. Let's talk about the difference between electromagnetic water meter and ultrasonic water meter?
1. Water regulations
Electromagnetic water meter: it will not be harmed by residues and compounds such as gravel, weeds, etc. in the material, but it is easily affected by magnetic chemical substances;
Ultrasonic water meter: there are no moving parts in the measuring pipe, and the pressure loss is small; Wide measuring range and good small flow detection ability; At the same time, it will hardly be affected by residues, compounds and magnetochemical substances such as gravel, weeds and so on.
2. Range ratio
Electromagnetic water meter: the measurement performance of low flow rate is poor, the measurement performance of medium and high flow rate is stable, and the range ratio coverage is difficult to cover the small flow area.
Ultrasonic water meter: the measuring range is mostly better than 100:1. The extremely low starting flow rate can be lower than 0.01m/s. The effective measuring range is large and can prevent running, emitting, dripping and leakage.
3. Waterproof grade
Electromagnetic water meter: for electronic products, the protection grade is strictly required to be IP68 or even higher. Only qualified products can be achieved.
Ultrasonic water meter: it is an electronic device product. The waterproof grade shall strictly comply with the IP68 regulations. Only qualified products can achieve this.
4. Abrasiveness
Ultrasonic water meter: without any mechanical moving parts, it is almost never worn. The accuracy has little to do with the service time. Generally, the calibration cycle of measurement exceeds three years.
Electromagnetic water meter: without all mechanical equipment subject moving parts, it will never be damaged. The precision has little to do with the service time. Generally, the measurement verification cycle is more than three years.
5. Installation method
Electromagnetic water meter: u10d5 or u5d3: 10/5 times the pipe section aperture length at upstream and 5/3 times the pipe section aperture length at downstream; Horizontal or vertical, always in the same plane as the electrode.
Ultrasonic water meter: the industry-leading product can be better than u3d0: the upstream needs 3 times the pipe section aperture length, and the downstream can be directly connected to the elbow. The installation method can be selected at will according to the on-site standard. It can be installed horizontally, vertically or askew.
The electronic water meter has its own electrical signal output, which can effectively overcome the problem of measurement data output and conversion. In terms of intelligence, it has great advantages over the mechanical water meter, and can be more convenient for data remote transmission, prepayment and other functions. However, the price of electronic water meters is generally high, which has the limitation of being easily disturbed by environmental conditions.
The above is all about the difference between electromagnetic water meter and ultrasonic water meter. I hope it can help you.
