Instrument for measuring liquid level
Thread Content
I often see issues related to the selection of level gauges; many people choose radar or ultrasonic types. Personally, I think that when it’s possible to use a contact-type gauge among the available options, it’s better to go with that one. Its stability, accuracy, and price are all quite good. I’m not sure what leads people to choose radar or ultrasonic gauges. What do you all think?
1# hefeiyibiao radar level gauges are particularly suitable for products with high pollution levels or high viscosity, such as asphalt. Radar level gauges offer high repeatability in measurements, do not require regular maintenance or recalibration, and provide high accuracy; however, they are expensive and have difficulty measuring the oil-water interface. The ultrasonic transducer converts electrical power pulses into ultrasonic waves, which are directed toward the liquid surface; after being reflected by the surface, those ultrasonic waves are then converted back into electrical signals by the transducer. Ultrasonic waves are mechanical waves; they exhibit low propagation attenuation, strong signal reflection at interfaces, and simple transmission and reception circuits, which is why they are widely used ； However, the propagation speed of ultrasound is affected by factors such as the density, concentration, temperature, and pressure of the medium, resulting in low measurement accuracy.
Radar and ultrasonic level gauges are generally used for measuring liquid levels in tanks over long ranges, while they are rarely used for measuring levels in industrial processes.
The high-precision intelligent external-mounted level gauge is a new technology and product; it employs a sensing element that is mounted externally and in non-contact with the liquid being measured, representing a significant innovation in the history of level measurement. External-mounted level gauges can continuously measure the liquid level outside the tank; they require no drilling in the tank and installation can be carried out without interrupting production, making them particularly suitable for upgrading older products. These instruments are safe, reliable, highly accurate, have a long service life, and are easy to install and maintain. They are particularly suitable for accurately measuring the level of various toxic substances, strong acids, strong bases, high-temperature fluids, as well as various pure liquids in enclosed containers.
Personally, I think it also depends on the process conditions