Radar Level Transmitter
Product Overview
A Radar Level Transmitter is a non-contact or guided-wave level measurement instrument used to continuously measure the level of liquids, slurries, and bulk solids in tanks, vessels, and silos. It operates by transmitting microwave (radar) signals toward the material surface and measuring the time it takes for the echo to return. Because radar technology is largely unaffected by temperature, pressure, vapor, dust, or density changes, radar level transmitters provide high accuracy, reliability, and low maintenance in demanding industrial environments.
There are two main types:
- Non-contact Radar (Free-space radar)
- Guided Wave Radar (GWR)
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How it works (simple explanation)
- The transmitter emits a microwave radar signal from an antenna (or probe).
- The signal travels toward the material surface.
- When it hits the surface, the signal is reflected.
- The transmitter measures the time of flight of the signal.
- Using the known signal speed, the device calculates the distance to the surface, and therefore the level.
- In simple terms: shorter return time = higher level.
What it measures
- Continuous level of liquids, solids, and slurries
- Distance to surface
- Level percentage, volume, or mass (with tank linearization)
- Suitable for:
- High temperature and pressure processes
- Corrosive or hazardous materials
- Applications with vapor, foam, or dust
Key advantages
- Non-contact measurement (free-space radar)
- Unaffected by temperature, pressure, density, or vapor
- High accuracy and repeatability
- Minimal maintenance (no moving parts)
- Suitable for extreme process conditions
- Works well with foam, turbulence, and dust
- Long measuring range
- Ideal for hazardous and corrosive environments
Applications
- Oil & gas – tanks, separators, storage vessels
- Chemical industry – corrosive and aggressive liquids
- Water & wastewater – reservoirs, tanks, pumping stations
- Food & beverage – hygienic tank level measurement
- Pharmaceuticals – sterile and high-accuracy processes
- Mining & cement – silos, bulk solids, dusty environments
- Power plants – boilers, condensate tanks
- Marine & storage terminals
Installation
- Mount on the top of the tank or vessel
- Ensure a clear line of sight to the material surface (non-contact radar)
- Avoid interference from:
- Tank walls
- Agitators
- Inlet streams
- Use stilling wells or bypass chambers if needed
- For guided wave radar, ensure proper probe length and mounting
- Follow manufacturer recommendations for antenna type (horn, rod, parabolic)
- Correct parameter configuration (tank height, dielectric constant) is essential
Technical Specifications
Parameter | Specification |
Measurement Principle | Radar (Time-of-Flight) |
Radar Frequency | 6 GHz, 26 GHz, or 80 GHz |
Measurement Type | Non-contact radar or Guided Wave Radar |
Measured Media | Liquids, slurries, bulk solids |
Measuring Range | Up to 120 m (model dependent) |
Accuracy | ±1 mm to ±10 mm |
Operating Pressure | Vacuum to 400 bar (model dependent) |
Operating Temperature | –40 °C to +450 °C |
Process Connections | Threaded, flanged, hygienic |
Antenna / Probe Types | Horn, rod, parabolic, cable, coaxial |
Output Signals | 4–20 mA, HART, Modbus, Profibus |
Power Supply | 2-wire loop powered or 4-wire |
Housing Protection | IP66 / IP67 |
Hazardous Area Approval | ATEX, IECEx (optional) |