Ultrasonic Level Transmitters

An ultrasonic level transmitter is a highly technical device that is widely used in the industrial field, which utilises the propagation characteristics of ultrasonic waves to measure the liquid level in liquid or solid containers. It uses a piezoelectric transducer to send ultrasonic pulses, which reflect off the surface of the material being measured. The transmitter calculates the distance based on this “time of flight” and the speed of sound to determine the level, which is then converted into a standard output signal.

The Working Principle of Ultrasonic Level Transmitters

Using the velocity propagation of ultrasonic waves, the height of a liquid level is calculated by transmitting an ultrasonic signal and receiving its reflection. A liquid-level meter transmitter basically consists of an ultrasonic transducer and an electronic transmitter unit.

The transducer is mounted on the top of the vessel, while the transmitter unit is used to process the ultrasonic data collected by the transducer and convert it to a standard current signal or other communication protocols for connection to a monitoring system or control system.

Key Features of Ultrasonic Level Transmitters

These are the main features of an ultrasonic level transmitter:

• Non-Contact Measurement: Measures levels without physical contact, avoiding contamination or wear.
• High Accuracy: Provides precise and reliable level readings for critical process control.
• Versatility: Suitable for liquids, slurries, and solids in diverse industries.
• Wide Range: Capable of measuring levels in both small tanks and large storage silos.
• Durable Construction: Built to withstand harsh conditions, including dust, temperature fluctuations, and pressure variations.
• Easy Installation and Maintenance: Simple to install and requires minimal upkeep due to non-contact operation.
  Real-Time Monitoring: Offers continuous level measurement for accurate process monitoring.
• Flexible Output Options: Supports standard industrial signals such as 4–20 mA, HART, or Modbus for seamless integration with control systems.

Applications of Ultrasonic Level Transmitters

Ultrasonic level transmitters are highly beneficial in these industries:

• Oil & Gas industry
• Chemical industry
• Food and beverage production
• Water and wastewater treatment
• Pharmaceutical industry
• Environmental monitoring

Benefits of Ultrasonic Level Transmitters

Advantages of an ultrasonic level transmitter include:

• Safety and Hygiene: Non-contact measurement minimises the risk of contamination and exposure to hazardous substances.
• Cost-Effective: Reduces maintenance costs and downtime compared to contact-based level sensors.
• Reliable Performance: Functions accurately in challenging conditions, including dust, foam, or vapour.
• Process Efficiency: Provides real-time data, enabling better control, optimisation, and automation of industrial processes.
• Regulatory Compliance: Helps industries maintain accurate records for safety, quality, and environmental compliance.