Ultrasonic level transmitter
- Ultrasonic level transmitter is used for non-contact level sensing of highly viscous liquids, as well as bulk solids. They are also widely used in water treatment applications for pump control and open channel flow measurement. The sensors emit high frequency (20 kHz to 200 kHz) acoustic waves that are reflected back to and detected by the emitting transducer.
Ultrasonic level sensors are also affected by the changing speed of sound due to moisture, temperature, and pressures. Correction factors can be applied to the level measurement to improve the accuracy of measurement.
Turbulence, foam, steam, chemical mists (vapors), and changes in the concentration of the process material also affect the ultrasonic sensor’s response. Turbulence and foam prevent the sound wave from being properly reflected in the sensor; steam and chemical mists and vapors distort or absorb the sound wave; and variations in concentration cause changes in the amount of energy in the sound wave that is reflected back to the sensor. Stilling wells and waveguides are used to prevent errors caused by these factors.
The requirement for electronic signal processing circuitry can be used to make the ultrasonic sensor an intelligent device. Ultrasonic sensors can be designed to provide point-level control, continuous monitoring, or both. Due to the presence of a microprocessor and relatively low power consumption, there is also the capability for serial communication to other computing devices making this a good technique for adjusting calibration and filtering of the sensor signal, remote wireless monitoring, or plant network communications. The ultrasonic sensor enjoys wide popularity due to the powerful mix of low price and high functionality.
- Pannel flow totalizer drawing
- RS485 Protocol
- Hart Protocol