Guided Wave Radar Level Transmitter

 

ZSRD70X Guided Wave Radar Explosion-proof Magnetic Level meter is a measuring instrument based on the principle of time travel. The radar wave runs at the speed of light, and the running time can be converted into a level signal by electronic components. The probe sends out high-frequency pulses and propagates along the cable or rod probe. When the pulses meet the surface of the material, they are reflected back and received by the receiver in the meter, and the distance signal is converted into a level signal.

The reflected pulse signal is transmitted to the electronic circuit part of the instrument along the cable or rod probe. The microprocessor processes this signal to identify the echo generated by the microwave pulse on the surface of the material. The correct echo signal identification is completed by the pulse software, and the distance D from the surface of the material is proportional to the time travel T of the pulse:

D=C×T/2

Where C is the speed of light

Since the distance E of the empty tank is known, the level L is:

L=E-D

By entering the empty tank height E (=zero point), the tank is full

Height F (= full scale) and some application parameters

Setting, application parameters will automatically make the meter adapt to the measurement

Quantity environment, corresponding to 4-20mA output.

Measuring range:

H----Measuring range

L----empty tank distance

B----top blind zone

E----Minimum distance from probe to tank wall

The top blind zone refers to the minimum distance between the highest material surface of the material and the measurement reference point.

The bottom blind zone refers to a distance near the bottom of the cable that cannot be accurately measured.

There is a finite measurement distance between the top blind zone and the bottom blind zone.

 

 

 

1.1 Application function

RD800X77-81GHz FM FMCW radar products (also known as millimeter wave radar),

because it adopts higher than Ku band radar frequency millimeter wave band, in the remote target detection, strong smoke dust environment, long distance

 

Radar Bit Meter

● Easy to be absorbed by polar molecules: this band has less scattering in the non-uniform substances, and can detect and measure the water vapor content. They can also be

studied by analyzing their characteristic profiles or by conducting quality control.

As a 78GHz band radar used in the field of industrial measurement, high precision and

non-contact level and liquid level measurement has the incomparable advantages of other

ordinary microwave pulse radar and guided wave radar. Its extremely narrow beam and

penetration ability can be more adapt to super complex working conditions without weakening the measurement performance.

1.2 RD800X Products suitable for the application field

● The product electromagnetic wave emission angle is less than 3°, which is suitable for narrow space or guide wave pipeline measurement

● The product can reach a 120M measurement range, suitable for the measurement of a very large storage tank

● Product measurement blind area in 7-8CM range, suitable for small storage tanks

● The product has extremely high measurement accuracy, suitable for high precision measurement

● The product has rich echo processing algorithm and experience data of various operating conditions, mixing and heating rod.

1.3 RD800X Product features

● 77GHz-81GHz FM wave radar

● 5GHz super-large FM scanning frequency width, wide application surface

● Standard HART, RS485 / MODBUS bus protocol is supported

● Support the upper machine setting software, tank side table and other operating modes

● 24VDC power supply

● Simple installation structure, adapted to various installation forms on site

 

 

 

 

 

3.1 Installation site

● Avoid mounting the instrument in the central position or near the edge of the container, otherwise likely to produce incorrect readings.

 

 

 

 

 

 

 

 

● Beam scattering: due to the polarization effect of microwave signal and the vessel wall, the instrument distance from the containershall be no less than 20mm from the sidewall.

● Polarization effect:

(1) Emission cones encountering flat obstacles and vertical struts can cause large

spurious reflections. These obstacles reflect radar signals of large amplitude. The surface of circular obstaclescatthe reflected wave of radar signal, produces false reflection of small amplitude.

(2) To obtain the minimum false reflection, the instrument is first rotated to obtain the

best signal (the lowest false echo amplitude), and then the false echo curve is established.

Figure 3-5 Schematic diagram of the radar beam space geometry of the instrument

 

● FM resolution

RD800X Frequency modulation bandwidth of B=5.1GHz,the minimum distance resolution

The IF signal of RD800X was analyzed by its own algorithm with a measurement accuracy of 0.1mm.

 

● Distance resolution (Range Resolution)

Generally speaking, distance resolution refers to how far two objects objects are apart, and the bit radar can distinguish two objects rather than one and measure their respective

distances.

If the distance interval between two objects is less than the distance resolution of the object radar, then the radar can only measure a distance value, which is not equal to the distance value of either of the objects, but a combination of the distance values of the two objects.

● Measurement accuracy (Accuracy)

If there is only one object and the object moves for a small distance, whether the position radar can recognize the distance change. The indicator that determines the movement distance of an individual object is called precision.

 

 

 

Hot Tags: guided wave radar level transmitter, Smart Temperature Switch, Micro Wind Differential Pressure Sensor, Contactless Radar Level Sensor Meter Transmitter, Magnetic level Transmitter, Magnetic level Meter, bin master level sensor