Description
What is a radar level sensor?
A radar level sensor is a device that uses radar technology to measure the level of a substance, such as a liquid or solid, in a container, tank, silo or bin. It is a continuous level measurement device that provides real-time, non-contact level measurement.
Radar Level Sensor Working Principle
The basic working principle involves transmitting a burst of electromagnetic waves (microwaves) from the sensor and measuring the time it takes for the waves to travel to the target and back. The time-of-flight is then used to calculate the distance.
Here is the step-by-step process:
* A radar electromagnetic burst is transmitted and directed by a dielectric rod antenna or metal horn antenna.
* The electromagnetic waves (microwaves) propagate toward the surface of the target and then reflect back towards the sensor.
* The reflected waves are received by the same antenna and converted to an electrical signal.
* The electrical signal is amplified and processed.
* The sensor measures the time it takes for the emitted waves to travel to the material surface and back using time-of-flight principle.
* The microprocessor in the sensor calculates the distance to the target using the speed of light, a known variable, and the round-trip time as shown in the following equation:
* Where division by two is required as time measurement is round-trip (to the target and back).
* The calculated distance is converted linearly to 4 mA to 20 mA current. Optionally, information can be sent via RS485 to a PC for processing such as diagnostics, programmable set-up and data logging.
* The distance measurement is then used to determine the level of the substance in the tank.
* Non-contact radar, no wear, no pollution.
* Almost no corrosion, bubble effect; almost not affected by water vapor in the atmosphere, the temperature and pressure changes.
* Serious dust environment on the high-level meter work has little effect.
* A shorter wavelength, the reflection of solid surface inclination is better.
* Beam angle is small, the energy is concentrated, which can enhance the ability of echo and avoid interference.
* The measuring range is smaller, for a measurement will yield good results.
* High signal-to-noise ratio, the level fluctuation state can obtain better performance.
* High frequency, measurement of the solid and low dielectric constant of the best choice.
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Measurement medium ：
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Liquid
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Measurement range：
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30m
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Process connect ：
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G1/2/ bracket/ flange
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Process temperature：
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-40~100℃
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Process pressure：
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Normal pressure
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Antenna material：
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Stainless stell
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Accuracy：
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±3mm
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Level of protection：
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IP67/ IP65
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Center frequency：
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26GHz
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Power supply：
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DC(9-24V)
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Outer shell：
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Aluminum/stainless steel
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Signal putout：
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RS485 Modbus
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