1, installation and maintenance, ultrasonic flowmeter is the most convenient, no process parking is required, and the other two must be parked to install
2. Measuring medium, mechanical water meter generally only measures tap water, the medium measured by electromagnetic flowmeter must be conductive, and ultrasonic has the widest measuring range.
3, accuracy, electromagnetic flowmeter is the highest, generally up to 0.5, ultrasonic flowmeter second, generally 1 grade, and mechanical water meter accuracy is the worst
4, stability, general electromagnetic flowmeter is best, followed by water meter, and ultrasonic is the worst
5, the price, ultrasonic and electromagnetic flowmeter compared to the general small diameter of the electromagnetic flowmeter has an advantage, the large diameter is the advantage of ultrasound, and the mechanical water meter is the cheapest price