Choosing the right radar level transmitter depends on process conditions, tank design, and measurement requirements. The key factors below will help you select the most suitable model.
1. Type of medium
First, identify what you need to measure:
Liquids (water, oil, chemicals)
Viscous liquids or slurries
Foaming media
Bulk solids or powders
For liquids with foam or agitation, 80 GHz radar is recommended.
For solids and large silos, 26 GHz radar is usually more suitable.
2. Measuring range
Determine the required measuring distance:
Short range with high accuracy → 80 GHz radar
Long range or deep tanks/silos → 26 GHz radar
Always select a model with a measuring range greater than the actual tank height to ensure reliable operation.
3. Process temperature and pressure
Check the operating conditions:
Standard tanks: normal temperature and pressure
Harsh conditions: high temperature, high pressure, vacuum
Radar level transmitters can typically handle:
–40 to +200 °C (or higher with special designs)
Vacuum up to 40 bar or more
Choose appropriate antenna materials and process connections accordingly.
4. Tank type and internal structure
Consider:
Tank diameter and height
Presence of agitators, coils, ladders, or baffles
Inlet pipes or filling streams
For narrow tanks or tanks with many internals, 80 GHz radar with a narrow beam angle reduces false echoes and improves stability.
5. Installation conditions
Evaluate:
Mounting nozzle size and length
Distance from tank wall
Top-mounted or side-mounted installation
Short, wide nozzles and flush-mounted antennas are preferred for best performance.
6. Required accuracy and resolution
General level monitoring → 26 GHz radar
High-precision measurement (mm-level) → 80 GHz radar
Higher frequency provides better resolution and surface detection.
7. Output signals and communication
Select the required interface:
4–20 mA
HART
Modbus RS485
Optional Bluetooth or local display
Ensure compatibility with your PLC, DCS, or SCADA system.
8. Safety and certifications
For hazardous areas, confirm:
Explosion-proof or intrinsically safe certification
Suitable IP rating
Chemical compatibility of wetted parts
This is critical for chemical, oil & gas, and petrochemical applications.
9. Maintenance and lifecycle cost
Radar level transmitters offer:
Non-contact measurement
No mechanical wear
Minimal maintenance
Choose models with strong diagnostics and easy commissioning to reduce long-term costs.
Summary
To choose the right radar level transmitter, consider:
Medium type
Measuring range
Temperature and pressure
Tank size and internals
Required accuracy
Output and communication
Safety certifications
Rule of thumb:
80 GHz radar → high accuracy, narrow beam, foam or complex tanks
26 GHz radar → long range, bulk solids, large vessels
Post time: Feb-09-2026