Why Ultrasonic Level Sensors Not Recommended for Pressure & High Temperature Tanks
Ultrasonic level sensors are generally not suitable for monitoring pressure and high-temperature containers. The reasons are included the following 5 considerations.
1.Pressure Impact
Ultrasonic level sensors measure by sending sound waves through the medium and measuring the time it takes for them to return. The pressure of the medium, especially in gases, affects the speed of sound, which can cause measurement inaccuracies. While ultrasonic sensors work well for liquid levels in normal conditions, in pressure vessels—especially those under high pressure or containing gas—the effect of pressure on gas density and sound speed can cause significant errors. Therefore, ultrasonic sensors are not suitable for high-pressure environments.
2.Temperature Limitations
Ultrasonic type sensors are very sensitive to temperature changes. Typically, the sensor’s probe temperature should not exceed 80°C. If it goes beyond this range, the sensor’s performance can deteriorate significantly, and it might even get damaged. In high-temperature vessels, where temperatures can exceed 100°C, ultrasonic level sensors are not ideal.
3.Interference from Bubbles and Steam
In pressure and high-temperature vessels, the presence of liquid, gas, or steam may generate bubbles or vapor layers that interfere with the propagation of sound waves. Ultrasonic waves cannot effectively pass through bubbles or steam, leading to signal attenuation or unclear reflections, which impacts measurement accuracy.
4. Reflection Surface Issues
Ultrasonic level trasmitters rely on the reflection of sound waves off the surface of the medium to measure the level. In high-temperature and high-pressure environments, the properties of the reflective surface within the vessel may change, causing unstable signals and further affecting measurement precision.
5.Installation and Calibration Challenges
Installing and calibrating ultrasonic level sensors in high-pressure, high-temperature, or closed environments can be more difficult. These environmental conditions can significantly affect the instrument, and special protective measures are required, especially for the sensor’s interface, to ensure the equipment can operate stably in such harsh conditions.
Attention should be paid when we use ultrasonic sensors in outdoor sealed containers without a shield. Remember an appropriate range must be selected!
Contact Holykell engineers for help in choosing the correct model for your projects.
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