Level Transmitters
Level transmitters measure the level of liquids, slurries, or solids in tanks, vessels, and open channels, converting the measurement into an electrical output signal for monitoring and control systems. We stock hydrostatic, ultrasonic, radar, and capacitance level transmitters for industrial process and water/wastewater applications.
Types of Level Transmitters
Hydrostatic (submersible) level transmitters measure the pressure exerted by liquid above the sensor to calculate level, offering a simple and reliable solution for open tanks and wells. Ultrasonic level transmitters use sound waves from above the liquid to measure level without contact, well suited for corrosive or dirty media. Radar level transmitters use microwave signals for non-contact measurement, offering high accuracy and minimal sensitivity to vapor, foam, or temperature changes compared to ultrasonic. Capacitance level transmitters detect level changes based on the dielectric properties of the media, often used for point-level or continuous measurement in specific process applications.
Choosing the Right Level Transmitter
Selection depends on the media type (liquid, slurry, or solid), tank conditions (open or pressurized, presence of foam or vapor), required accuracy, and whether contact or non-contact measurement is preferred. Non-contact methods like radar and ultrasonic are often favored for corrosive, sticky, or hygienic applications.
Output & Accuracy
Most level transmitters output a 4-20mA signal, with some models offering HART, digital, or wireless communication for integration with process control systems. Accuracy varies by technology, with radar typically offering the highest precision at ±0.1% to ±0.5% of range.
Common Applications
- Tank level monitoring in process industries
- Water and wastewater treatment
- Chemical storage and dosing
- Food and beverage processing
- Silo and bulk solids level measurement
Not sure which level transmitter fits your application? Contact our team — we can help match technology, range, and output to your specific requirement.
Frequently Asked Questions
Should I choose a contact or non-contact level transmitter?
Non-contact technologies like radar and ultrasonic are generally preferred for corrosive, sticky, or hygienic applications where sensor fouling is a concern. Contact methods like hydrostatic sensors are a reliable, cost-effective option for many standard liquid applications.
What’s the difference between radar and ultrasonic level transmitters?
Radar transmitters use microwave signals and are less affected by vapor, foam, and temperature variation compared to ultrasonic, which uses sound waves and can be more sensitive to these conditions.
What output signal do level transmitters provide?
Most level transmitters provide a standard 4-20mA analog output, with many models also supporting HART protocol for additional diagnostic and configuration data.
Do you provide calibration certificates for level transmitters?
Yes, select models are available with a NIST-traceable calibration certificate at the time of purchase. Look for the certification filter above or contact us for a custom calibration request.