Comparison of ultrasonic water meter, electromagnetic water meter and mechanical water meter

Comparison of ultrasonic water meter, electromagnetic water meter and mechanical water meter

1. Water quality requirements

Ultrasonic water meter: It is not interfered by impurities such as gravel and weeds in the medium, chemical substances, and magnetic substances.

Electromagnetic water meter: not affected by impurities such as gravel and weeds in the medium, chemical substances, and magnetic substances.

Mechanical water meter: water quality similar to tap water must be used, and the liquid must not contain impurities such as rust, gravel, aquatic plants, etc.

2. Turndown ratio

Ultrasonic water meter: the range is generally better than 100:1, the initial flow velocity is extremely low, which can be lower than 0.01m/s, the effective measurement range is large, and it can avoid running, popping, dripping, and leaking.

Electromagnetic water meter: low flow rate measurement performance is poor, medium and high flow rate measurement performance is stable. Turndown ratio coverage does not cover small flow areas.

Mechanical water meters: it is difficult to produce products with high range ratio, and the range ratio of conventional water meters is generally below 80

3. Abrasiveness

Ultrasonic water meter: without any mechanical moving parts, it will never wear out, the accuracy has little to do with the use time, and the general verification period is more than 3 years.

Electromagnetic water meter: without any mechanical moving parts, it will never wear out, the accuracy has little to do with the service time, and the general verification period is more than 3 years.

Mechanical water meter: It uses mechanical rotating parts such as impellers and gears to measure, which has wear and tear, and the longer it is used, the lower the measurement accuracy.

4. Pressure loss

Ultrasonic water meter: meet the minimum level of pressure loss ΔP10

Electromagnetic water meter: meet the minimum level of pressure loss ΔP10

Mechanical water meter: the pressure loss is very large, around ΔP63

5. Degree of protection

Ultrasonic water meters: electronic products, strict requirements for IP68 protection level, must be qualified products can reach

Electromagnetic water meter: electronic products, strict requirements for IP68 protection level, must be qualified products can reach

Mechanical water meter: IP68

6. Installation requirements (flow field sensitivity level)

Ultrasonic water meter: industry-leading products can be better than U3D0: the upstream needs to be 3 times the length of the pipe section aperture, and the downstream can be directly connected to the elbow

Electromagnetic water meter: U10D5 or U5D3: 10/5 times the aperture length of the pipe section in the upstream, and 5/3 times the aperture length of the pipe section in the downstream;

Mechanical water meter: U10D5: 10 times the aperture length of the pipe section in the upstream, and 5 times the aperture length of the pipe section in the downstream;

7. Installation method

Ultrasonic water meter: free to choose the installation method according to the site conditions, horizontal, vertical, or inclined installation

Electromagnetic water meter: horizontal or vertical, the electrodes must be on the same level

Mechanical water meter: single installation, must be installed strictly horizontally or vertically

8. Power problem

Ultrasonic water meter: Qualified product, with a flow measurement cycle of at least 1 second, the battery life can be guaranteed to be more than 10 years.

Electromagnetic water meter: The principle of electromagnetic induction determines that the power consumption is relatively large. Generally, it takes 15s to measure the flow once, and the battery life is 3-5 years.

Mechanical water meter: the mechanical base meter does not require power supply

9. Communication network

Ultrasonic water meter: initiated by the internal circuit, no external electronic device is required, and the communication has zero error

Electromagnetic water meter: initiated by the internal circuit, no external electronic device is required, and the communication has zero error

Mechanical water meter: additional electronic device is required.