Non-Contact Sensing
Mounted entirely above the liquid surface with zero mechanical wear, zero corrosion exposure, and zero maintenance.
Level Instruments
Radar Level Transmitter
Non-Contact Continuous Microwave Radar Level Measurement
Precision Microwave Radar Sensing for Demanding Tanks & Vessels
The FlowDo Radar Level Transmitter provides non-contact continuous liquid and solids level measurement. Utilizing high-frequency microwave radar pulses, it operates reliably through vapor, steam, dust, and temperature variations without physical contact with the process medium.
RADAR MICROWAVE
Technology
NON-CONTACT
Measurement Type
UP TO 30 METERS
Measuring Range
4–20 mA / RS485
Output & Protocol
Product Overview
Precision Non-Contact Microwave Sensing
Advanced radar level measurement designed for challenging industrial tanks, chemical reactors, and process vessels.
The FlowDo Radar Level Transmitter emits focused high-frequency microwave radar pulses towards the liquid or solid material surface. When the radar beam reaches the medium interface, a portion of the electromagnetic energy is reflected back to the antenna receiver.
Using advanced Time-of-Flight (ToF) processing algorithms, the micro-controller calculates the exact distance from the antenna reference to the surface: Level = Vessel Height − Measured Distance. Because electromagnetic waves travel at the speed of light and do not require air as a transmission medium, radar measurement is unaffected by tank pressure, temperature, light vapor, or vacuum conditions.
Key Engineering Highlights
- True non-contact sensing with zero wetted parts immersion
- Immunity to ambient temperature shifts, vacuum, vapor, and gas layers
- Long measuring spans up to 30 meters with narrow beam angle options
- Stainless steel horn antenna or sealed PTFE sanitary antenna options
- Standard 2-wire 4–20 mA with HART or RS485 Modbus RTU communication
Verified catalogue data
Technical Specifications
Technical parameters for FlowDo Radar Type Level Transmitters.
Brand / Manufacturer
FlowDo Process Instruments
Product Name
FlowDo Radar Type Level Transmitter
Measurement Type
Continuous Non-Contact Level (0–100%)
Operating Principle
Time-of-Flight (ToF) High-Frequency Microwave Radar
Measuring Range
Up to 30 meters (liquids); up to 15 meters (solids/powders)
Measurement Accuracy
±3 mm to ±5 mm
Output Signal
4–20 mA (2-Wire Loop Powered) / RS485 Modbus RTU
Power Supply
24 V DC (18–30 V DC)
Antenna Type
SS316 Horn Antenna / PTFE Sealed Flange Antenna
Process Connection
G1.5", G2" Thread or ANSI 150#/300# Flanged (DN50, DN80, DN100)
Process Temperature
-40°C to +150°C (Standard); up to +250°C (High Temp Option)
Process Pressure
-1 bar (Vacuum) up to 20 bar
Enclosure Rating
Die-cast Aluminum IP67 Weatherproof
Product design
Key Features
Precision industrial radar sensing engineered for demanding tank environments.
Vapor & Temperature Immunity
Microwave signals pass freely through steam, vapor, dust, and temperature layers that disrupt acoustic sensors.
Long 30 m Range
Covers deep industrial storage tanks, tall bulk liquid silos, and large utility reservoirs with millimeter resolution.
Corrosion Resistant Antennas
Available with SS316 stainless steel horn antennas or fully PTFE-encapsulated sanitary and chemical flange assemblies.
4–20 mA & Modbus RS485
Dual output capability enables simultaneous analog control loops and digital remote SCADA telemetry monitoring.
Vacuum & High Pressure Rated
Operates reliably from full vacuum conditions up to 20 bar operating pressure inside sealed process reactors.
Industries and processes
Applications
Non-contact continuous level measurement across demanding industrial vessels and processing facilities.
Chemical & Corrosive Liquids
Acids, alkalis, solvents, and corrosive chemicals in sealed reactors with PTFE-encapsulated antennas.
Petrochemical & Fuel Storage
Diesel, petroleum fuels, crude storage tanks, and solvent holding vessels requiring non-contact safety.
Water & Wastewater Treatment
Deep sumps, sludge holding basins, intake reservoirs, and chemical mixing tanks with high surface humidity.
Pharmaceutical & Food Processing
Hygienic batch vessels, CIP holding tanks, and sanitary liquid storage with clean-in-place flange connections.
High Temperature Process Tanks
Bitumen, hot oils, boiler condensate, and high-temperature process tanks with cooling extension flanges.
Solids & Bulk Storage Silos
Grains, plastic pellets, cement, and bulk minerals in storage silos up to 15 meters.
System Integration
From Tank Measurement to Process Monitoring
Seamless signal transmission from field radar measurement to industrial plant control architecture.
Radar Level Transmitter
Non-Contact Field Sensor
↓
Continuous Level Value
Calibrated Process Variable
↓
Supported Process Output (4–20 mA)
Standard Industrial Process Signal
↓
Local Indicator
Digital Process / Level Display
PLC / Controller
Automation & Logic Control
↓
SCADA & Plant Monitoring / Control
Real-time telemetry, automated pump control & historical trending
Level Technology Overview
Choose the Right Continuous Level Technology
Comparison of primary FlowDo continuous level measurement instruments.
Radar Level Transmitter
- Principle
- Electromagnetic radar / microwave
- Installation
- Typically tank top for non-contact models
- Process Contact
- Non-contact for applicable models
- Measurement
- Continuous
- Best Considered For
- Applications where radar technology is suitable for the medium and tank conditions.
Ultrasonic Level Transmitter
- Principle
- Sound-wave / acoustic echo
- Installation
- Tank top
- Process Contact
- Non-contact
- Measurement
- Continuous
- Best Considered For
- Compatible open/closed tanks where ultrasonic conditions are suitable.
Hydrostatic Level Transmitter
- Principle
- Liquid hydrostatic pressure
- Installation
- Submerged / pressure sensing
- Process Contact
- Yes (sensor exposed to liquid)
- Measurement
- Continuous
- Best Considered For
- Compatible liquids where hydrostatic measurement is appropriate (sumps, borewells, tanks).
Technology selection should consider medium characteristics, tank geometry, installation access, measurement range, temperature, pressure, atmosphere and required accuracy.
Product Range
Available Level Transmitter Configurations
FlowDo level instruments can be selected according to measurement range, process connection, material compatibility, output and installation requirements.
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Side Mounted Level Transmitter
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View details & specs →Frequently Asked Questions
Frequently Asked Questions
Common questions regarding radar level measurement, installation and configuration.
What is a radar level transmitter?
A radar level transmitter uses electromagnetic radar energy to determine the distance to a material surface and convert that measurement into continuous level information.
Is radar level measurement contact or non-contact?
Standard top-mounted radar level transmitters can provide non-contact measurement. The exact construction depends on the selected FlowDo model.
What is the difference between radar and ultrasonic level measurement?
Radar uses electromagnetic energy, while ultrasonic transmitters use acoustic sound waves. Their suitability depends on the medium, tank geometry, measurement range and process conditions.
Can radar level transmitters connect to PLC systems?
Compatible transmitter configurations can provide process outputs suitable for integration with PLC and other control systems. Available outputs depend on the selected model.
Can radar level data be displayed in SCADA?
Yes, when the selected transmitter output and system architecture are compatible, the level signal can be integrated into PLC/SCADA monitoring systems.
Can radar measure through foam or vapor?
Application suitability depends on the radar technology, medium properties, foam/vapor characteristics, tank geometry and selected transmitter. The application should be reviewed rather than assuming universal suitability.
Does a radar transmitter touch the liquid?
For non-contact radar models, the sensing device is mounted above the material and does not require a submerged measuring probe.
Where should a radar level transmitter be installed?
The mounting position should provide a suitable measurement path while considering tank geometry, nozzles, internal obstructions, inlet streams and the requirements of the selected transmitter.
How do I choose the radar measurement range?
Tank dimensions, minimum and maximum levels, installation position, blocking distance and the supported range of the selected model should be considered.
Which is better: radar, ultrasonic or hydrostatic?
There is no universally best technology. Selection depends on the process medium, tank configuration, measurement range, environmental/process conditions, required accuracy and installation requirements.
Need Help Selecting a Radar Level Transmitter?
Configure the Right Radar Level Solution for Your Tank
Share your tank dimensions, process medium, measurement range, temperature, pressure, process connection and output requirements with FlowDo to identify a suitable configuration.
For faster selection, provide: Tank Height • Measured Medium • Range • Temperature • Pressure • Connection • Antenna Type • Output Requirements