The ultrasonic level metering technology is based on the principle that the energy transducer (the sensor) emits an ultrasonic pulse train, receives and selects some echoes reflected from the medium surface, converting them into electronic signals.
The ultrasonic pulse travels at the speed of sound, and the time interval between emitting and receiving is in proportion to the distance between the sensor and the medium surface. The formula relating the distance S, sound speed C and the transmitting time T is as following:
The overlapping of the emitting and reflecting pulse within an area close to the sensor can not be identified and measured due to the limit width of the emitting ultrasonic pulse, the area is called Dead Zone. The distance of the dead zone is associated with the working frequency of the ultrasonic level transmitter.
The measuring reference level is at the bottom of the sensor.
A. Dead Zone
B. Measuring Range
C. Full of Medium
D. Zero Point
Features of the instrument:
1. Adapting microprocessor advanced
2. Unique echo processing technology
3. Storge of False echo
4. Internal temperature compensation
5. Narrow beam angle and high quality
6. Simple debugging and calibration
Main Application: Liquid level measurement in industrial areas, especially for water treatment industry.
Measuring range: 0.4m … 15m for liquids as below table
Process connection: M66×2 or flanges
The housing material of the transducer: PTFE, PU/PC, Al-Dicasting
Process temperature: -40°C … +70°C
Process pressure: -0.02MPa – 0.1MPa
Accuracy: ±0.5% of full range
Output: 4 – 20 mA or 4 - 20 mA/HART
Power supply: 24 V DC for two wires
24V DC/220V AC for four wires