The time difference ultrasonic flowmeter is equipped with sensors between the upstream and downstream of the pipeline for sending and receiving ultrasonic signals.
When the liquid does not flow, the speed and time of acoustic signal propagation between the upstream and downstream are the same. When the liquid flows, the upstream acoustic signal will propagate more slowly and take more time than the downstream acoustic signal. The faster the liquid flows, the greater the time difference between the upstream and downstream. Flow through the pipeline can be calculated from the difference in travel time between upstream and downstream directions (Tu-Td) measured on the same pipeline.
Compared with Doppler ultrasonic flowmeter, the time difference ultrasonic flowmeter is more accurate and more economical. The type of time difference ultrasonic flowmeter can be divided into V-type time difference flowmeter, Z-type time difference flowmeter and W-type time difference flowmeter according to the different installation conditions.
V-type time difference flowmeter
These two sensors are installed on the pipe, so that the ultrasonic wave propagates in a V-shaped form, so it is called a V-type time difference flowmeter.
Z type time difference flowmeter
Two sensors are installed on the pipe, so that the ultrasonic wave propagates in a Z-shape form, so it is called the Z-type time difference flowmeter.
W type time difference flowmeter
Two sensors are installed on the pipe, so that the ultrasonic wave propagates in a W-shape form, so it is called a W-type time difference flowmeter.
Advantages of time difference flowmeter
The main advantage of the time difference flowmeter is non-contact installation, which measures flow while maintaining fluid integrity.
In addition, the time difference flowmeter also has the following advantages:
1. Easy to install - external clamp mounted on the pipeline;
2. No moving parts wear;
3. Zero pressure drop;
4. Suitable for clean and ultra-pure fluids;
5. No leakage phenomenon;
6. Not affected by liquid temperature, viscosity, density or pressure and other factors.
