Start with the real measuring range
The first specification is not only tank height. Confirm the highest liquid or solid level, the lowest operating level, the nozzle height, and the sensor dead zone. A transmitter listed for 80 m range may still need a minimum blanking distance at the top of the tank.
For water tanks, 0.3-20 m is common. For cement, lime, grain, and plastic pellet silos, 20-80 m is more likely. Add at least 20% margin so the sensor is not working at its limit during abnormal operating conditions.
- Water storage tanks: prioritize stable echo and IP67 outdoor protection.
- Chemical tanks: confirm process temperature, vapor, and wetted housing material.
- Powder silos: prioritize narrow beam angle and strong false-echo suppression.
Check beam angle and installation space
80GHz FMCW radar produces a narrower beam than older low-frequency radar. That matters in tall or narrow vessels because the beam is less likely to hit ladders, agitators, bracing, or tank walls. In practical purchasing terms, a narrower beam can reduce commissioning time and false level jumps.
If the nozzle is close to the wall or the tank has many internal obstructions, send a simple drawing before ordering. A good supplier should confirm the mounting position instead of only quoting the lowest price.
Match outputs to the control system
Most industrial projects still use 4-20mA because it is simple, robust, and compatible with PLC and DCS analog input cards. HART is useful when engineers need remote diagnostics. RS485 Modbus is useful for multi-point monitoring or SCADA networks.
For retrofit projects, ask whether the existing panel is 2-wire loop-powered or 4-wire powered. This small detail affects wiring, power supply, and commissioning.
Do not ignore certification and documentation
For oil, gas, solvent, or dust explosion environments, check ATEX or IECEx marking before price comparison. For general water and utility projects, CE, RoHS, ISO 9001 factory control, calibration certificate, and serial-number traceability are usually the core documents buyers request.
A professional China level sensor manufacturer should provide a datasheet, wiring diagram, calibration certificate, and installation guide with the shipment.
Buyer FAQ
Is 80GHz radar better than ultrasonic level measurement?
80GHz radar is usually better for vapor, dust, foam, high temperature, and long measuring ranges. Ultrasonic sensors are more economical for clean water tanks and simple chemical storage where vapor and foam are limited.
What information should I send before buying a radar level transmitter?
Send tank height, medium, temperature, pressure, nozzle size, mounting location, required output signal, hazardous area requirement, and any internal structures such as agitators or ladders.
Can radar level sensors measure solids in silos?
Yes. 80GHz radar is commonly used for cement, lime, grain, plastic pellets, and powders. The supplier should check beam angle, dust level, and installation point before confirming the model.