Ultrasonic or Radar Level Transmitters:
Which One Fits Your Tank?
Both Ultrasonic and Radar Level
Transmitters give you continuous, non-contact level measurement — but they
don't perform the same way in every tank. NK Instruments Pvt. Ltd. manufactures
both technologies, and choosing the right one comes down to what's actually
happening inside your vessel: is it a clean, straightforward tank, or one with
dust, vapor, foam, or temperature swings to contend with?
🔊 Ultrasonic
Level Transmitter
Ultrasonic transmitters measure
level by emitting sound pulses toward the material's surface and timing the
echo that bounces back. Because the sensor never touches the process material,
it works equally well on liquids and solids, and is unaffected by the
electrical properties of the medium being measured.
Available as:
•
Non-Contact (Free-Space) Ultrasonic Level Transmitter
•
Self-adjusting tracking Ultrasonic with programmable or
simple push-button calibration
•
4–20 mA output, with optional RS-485 (Modbus RTU) for
PLC-based diagnostics and data logging
Best suited for:
•
Clean tanks, reservoirs, and open channels with stable
conditions
•
Applications where the medium's dielectric properties
are unknown or highly variable
•
Cost-effective continuous level monitoring for
straightforward liquids and bulk solids
⚠️ Where it struggles: Sound waves can be scattered or absorbed by dust,
heavy vapor, foam, and turbulent surfaces — and the speed of sound itself
changes with air temperature, which can affect accuracy if the vessel isn't
thermally stable.
📡 Radar Level
Transmitter
Radar transmitters use microwave
energy instead of sound, timing the reflected wave off the material's surface.
Because electromagnetic waves travel largely unaffected by air temperature,
pressure, dust, and vapor, radar tends to hold its accuracy in conditions where
ultrasonic signals degrade.
Available as:
•
Non-Contact (Free-Space) Radar Level Transmitter
•
Insertion Probe (Guided-Wave) Radar Level Transmitter
•
Self-adjusting tracking radar with programmable or
simple push-button calibration
•
4–20 mA output, with optional RS-485 (Modbus RTU) for
PLC-based diagnostics and data logging
Best suited for:
•
Tanks and silos with dust, vapor, or foam present
•
High-temperature or high-pressure vessels where thermal
stability can't be guaranteed
•
Tanks where agitator or, any motor is present, regardless
of noise being present in that application.
•
Tanks having agitator – as we can program the Radar
Level Transmitter to neglect the paddle of the agitator during its rotations.
•
Kilns, dams, and process vessels handling liquids with
fumes
⚠️ Where it struggles: Radar performance depends on the target material's
dielectric constant. Very low-dielectric materials (dry powders, certain
plastic pellets, low-moisture granules) reflect less energy back to the sensor,
which can make level detection more difficult without guided-wave or
specialised antenna configurations.
📊 Quick
Comparison
|
|
Ultrasonic Level Transmitter |
Radar Level Transmitter |
|
Measurement principle |
Sound wave time-of-flight |
Microwave (radar) time-of-flight |
|
Affected by dust / vapor / foam |
Yes — signal can scatter or
absorb |
Largely unaffected — penetrates
most dust, vapor, light foam |
|
Affected by temperature/pressure
changes |
Yes — sound speed varies with
air temperature |
Minimal — electromagnetic waves
are largely temperature-independent |
|
Depends on material's dielectric
constant |
No |
Yes — very low dielectric
materials can be harder to detect |
|
Mounting types available |
Non-contact only |
Non-contact (free-space) and
Insertion Probe (guided-wave) |
|
Best fit |
Clean tanks, open channels,
straightforward liquids/solids |
Foamy, dusty, or vapor-heavy
environments; high-temperature or high-pressure vessels |
🎯 Bottom Line
If your tank holds a clean,
stable medium and you need reliable, cost-effective continuous level
monitoring, the Ultrasonic Level Transmitter is a proven, straightforward
choice. If your process involves dust, vapor, foam, or wide temperature and
pressure swings, the Radar Level Transmitter is built to hold its accuracy
where ultrasonic technology starts to struggle — as long as the medium's
dielectric properties suit the radar type selected.
Not sure which technology fits
your vessel and medium? Our team can help you match the right level transmitter
to your actual tank conditions.
📄
Documentation
Catalogues available for both
the Ultrasonic and Radar Level Transmitter ranges — reach out and we'll share
full specs for your specific application.
Get in Touch
•
🌐 www.nkinstruments.com or, www.nkinstruments.org
•
📧
sales@nkinstruments.com
•
📞
022-41311330/1332/1334 | +91 8108125494 / 7718817685 / 9987275354
#LevelTransmitter
#UltrasonicLevelTransmitter #RadarLevelTransmitter #LevelMeasurement
#ProcessInstrumentation #NKInstruments #TankMonitoring #MakeInIndia #NoncontactLevelMeasurement
#HorntypeRadarLevelTransmitter #AntennatypeRadarLevelTransmitter
#LevelTransmitterforViscousmedia
