Selection Guide for radar, guided wave, ultrasonic, and capacitance level transmitters

Ziasiot Level Transmitter

Selection Guide for radar, guided wave, ultrasonic, and capacitance level transmitters

Radar Level Transmitter

The radar level sensors uses 23G/80G continuous wave radar with a maximum range of 70-200 meters and a maximum blind area of 0.2 meters. The continuous wave radar has a higher operating frequency, a larger bandwidth, and better accuracy and stability than traditional low-frequency radars. The radar module adopts FMCW mode and non-contact installation design, with a small size and compact structure. It has high accuracy, low power consumption, and strong anti-interference ability. It is suitable for water level monitoring in lakes and rivers, mountain torrent warnings, reservoirs, sewage pipe networks, etc.

Features of Radar Level Transmitter

✅ High accuracy (±0.5mm)

✅ Non-contact measurement (no wear & tear)

✅ Unaffected by density, dielectric, or conductivity changes

✅ Suitable for corrosive and high-temperature environments

Limitations

⚠ Foam or turbulent surfaces can disrupt signals

⚠ Blocking distance (minimum dead zone near the sensor)

⚠ Requires proper tank geometry for optimal performance

80GHz Radar Level Sensor

Industrial 80G Radar Level Sensor For Continuous Level Measurement Of Liquids And Bulk Solid, Low MOQ and Custom available

26ghz Radar Level Transmitter

The ZSRD501~ZSRD506 explosion-proof Tank Silo Bin 10m-120m contactless Radar Level Transmitter with rs485 output and alarm adopted 26G high-frequency radar sensor, the maximum measurement range can reach up to 80 meters. The antenna is optimized for further processing; the new fast microprocessors have higher speed and the efficiency can be done signal analysis, the instrumentation can be used for reactor, solid silo and very complex measurement environments.

Guided Wave Radar Level Transmitters (TDR)

Guided wave radar level transmitter uses a probe to direct radar pulses along its length. When the pulse hits the medium, part of it reflects back.

Advantages of Guided Radar

✅ Higher accuracy (±0.2mm)

✅ Works with some foam layers

✅ Unaffected by dielectric changes

✅ Ideal for small tanks or interface measurement

Limitations

⚠ Heavy foam can still interfere

⚠ Probe must be chemically compatible with the medium

⚠ Blocking distance applies

Guided Wave Radar Level Transmitter

ZSRD70X Guided Wave Radar Explosion-proof Level Transmitter is a measuring instrument based on the principle of time travel. The radar wave runs at the speed of light, and the running time can be converted into a level signal by electronic components.

Ultrasonic Level Transmitter

Ultrasonic level sensor (measures liquid level/material level) is a non-contact, highly reliable, cost-effective, easy to install and maintain liquid level/material level measuring instrument. It can meet most liquid level/material level measurement requirements without contacting the measured medium.

Advantages

✅ Lowest cost non-contact option

✅ No calibration needed for different liquids

✅ Unaffected by density or conductivity changes

Limitations

⚠ Foam, vapor, or dust can block signals

⚠ Not suitable for vacuum or high-pressure (>44 psia) applications

⚠ Affected by temperature variations

KUM Ultrasonic Level Sensor

Ziasiot KUM ultrasonic level (material place, liquid level) sensor is a non-contact, high-reliability, cost-effective, easy-to-install and maintain level measurement instruments. It does not have to contact medium and it can meet most of the requirements of level measurement.

Capacitance Level Transmitter

These measure changes in capacitance between a probe and tank wall as the level changes.

Advantages

✅ Cost-effective solution

✅ Fast response time

✅ Works in high-pressure/high-temperature conditions

Limitations

⚠ Probe coating can affect accuracy

⚠ Requires recalibration for different media

⚠ Minimum dielectric constant required (10 pF span)

Capacitive Level Transmitter

Industrial Grade Capacitance Level Transmitter Stainless Steel Water and Liquid Level Sensor

Conclusion: How to Choose the Right Level Transmitter

Factor	Radar	Guided wave	Ultrasonic	Capacitance
Accuracy	±0.5mm	±0.2mm	±3mm	±1% FS
Contact Type	Non-contact	Probe-based	Non-contact	Contact
Foam	Resistance	Moderate	Good	Poor Moderate
High Pressure/Temp	Yes	Yes	No	Yes
Cost	High	Medium-High	Low	Low-Medium

Final Recommendation

1- For corrosive liquids (e.g., sulfuric acid): 80GHz Radar (RD80G) for non-contact, high-accuracy measurement.

2- For powders/solids: Guided Radar (TDR) for better foam penetration.

3- For cost-sensitive applications: Ultrasonic (if no foam/vapor interference).

4- For high-pressure tanks: Capacitance or Radar.

Installation methods for 26G/80G/guided wave radar level sensors, you can select the best level transmitter for reliable and accurate measurements from Ziasiot Sensor.

Need help choosing? Contact us for expert guidance on radar level sensor selection!