Explosion Proof Powder Granule Block 20m Radar Level Transmitter

Product Description

Radar liquid level sensor technology transmits a high frequency electromagnetic wave pulse typically in the microwave spectrum, and receives the wave reflected off a liquid surface. The time taken for the microwave pulse to traverse the distance between the transmitting antenna and target surface, and back again to the receiving antenna is measured.

The distance (d) between the radar liquid level sensor and the liquid surface can be calculated by dividing the time taken (t) by two, and multiplying that by the speed of light (c), i.e. d = c ∙ t / 2. The liquid level in a tank (LT) can then be determined by subtracting distance (d) from the height of the radar level sensor (HT), i.e. LT = HT – d.

Unlike ultrasonic sensors, the performance of a radar level sensor is not easily affected by temperature changes, humidity or vapour between the sensor and the liquid surface. This is because changes in air density only have a very small effect on the speed of electromagnetic waves. Also radar liquid level sensors can work in a vacuum, high pressures and high temperatures without any noticeable difference on measured transit time, so it can be used in applications where it is not possible to use ultrasonic based sensors.

Features:

1. No media contact for vertically mounted type, so flexibility for use on different corrosive media, thick fluids, slurries, wastewater
2. High temperature fluid compatibility for vertically mounted types, since no sensitive components make contact with the fluid
3. High accuracy due to high frequency pulse wave and precise transit time time measurement
4. Sealed pressurised vessel will not affect performance
5. Longer range than ultrasonics
6. Not affected by surface changes such as air temperature, which cause problems with ultrasonics

♦903

	Suitable for Medium	Solid material, Strong dust,easy to crystallize, condensation occasion
	Measuring Range	70m
	Frequency	26GHz
	Accuracy	±15mm
	Process Temperature	-40℃~130℃(Standard type) -40℃~250℃(High temperature type)
	Process pressure	-0.1~4.0 MPa (Flat flange) -0.1~0.3MPa (Universal flange)
	Signal output	4~20mA /HART (2-wire / 4-wire) RS485/ Modbus
	Power Source	Two-wire (DC24V) Four-wire(DC24V/AC220V)
	Connection	Universal Flange
	Protection Grade	IP67
	Explosion-proof Grade	Exia IIC T6 Ga/Exd IIC T6 Gb

♦904

	Suitable for Medium	Solid material, Strong dust,easy to crystallize, condensation occasion
	Measuring Range	80m
	Frequency	26GHz
	Accuracy	±15mm
	Process Temperature	-40℃~130℃(Standard type) -40℃~250℃(High temperature type)
	Process pressure	-0.1~0.3MPa
	Signal output	4~20mA /HART (2-wire / 4-wire) RS485/ Modbus
	Power Source	Two-wire (DC24V) Four-wire(DC24V/AC220V)
	Connection	Thread, Universal Flange
	Protection Grade	IP67
	Explosion-proof Grade	Exia IIC T6 Ga/Exd IIC T6 Gb

♦906

	Suitable for Medium	Hygienic liquid storage, Corrosive container
	Measuring Range	20m
	Frequency	26GHz
	Accuracy	±3mm
	Process Temperature	-40℃ ~ 130℃
	Process pressure	-0.1~4.0MPa
	Signal output	4~20mA /HART (2-wire / 4-wire) RS485/ Modbus
	Power Source	Two-wire (DC24V) Four-wire(DC24V/AC220V)
	Connection	Flange
	Protection Grade	IP67
	Explosion-proof Grade	Exia IIC T6 Ga/Exd IIC T6 Gb

The sound wave is a mechanical wave with a density of 40; gas, liquid and solid 41; propagation depends on the influence of the medium, temperature and pressure on the measurement. Need temperature compensation. Temperature and pressure measurement are generally not applicable. First of all, the ultrasonic level gauge has a temperature limit. Generally speaking, the temperature of the probe cannot exceed 80 degrees, and the propagation speed of sound waves is greatly affected by temperature. Secondly, the ultrasonic level gauge is greatly affected by the pressure, generally within 0.3MPa, because the ultrasonic wave is emitted by the vibration of the piezoelectric material. When the pressure is too high, the sound part will be affected. Third, when the fog or dust in the measurement environment is large, the measurement effect is not good. The radar level gauge emits high-frequency pulses and propagates along the cable. When the pulse is in contact with the material surface, it is reflected by the receiver inside the instrument and the distance signal is converted into a material level signal. The electromagnetic wave is used as the detection signal, which is reflected to the interface as the dielectric constant changes. Electromagnetic waves can propagate in vacuum without being affected by changes in temperature and pressure. Therefore, it can be used in a high temperature and high pressure environment. The measurement of very low dielectric constant media is not applicable. The radar tube uses electromagnetic waves and is not affected by the degree of vacuum. It has a wide range of applications in terms of medium temperature and pressure. The emergence of high-frequency radar tubes makes the application range of radar tubes wider. Therefore, the radar tube is an

ideal choice for level measurement.

The measurement of solid-state lightning reaches, and the stronger the transmitting power (signal), the larger the corresponding upper blind zone. Therefore, when the range is small, the candidate high-frequency solid-state radar must verify the good range to avoid the pursuit of a large signal and a large blind zone. Impact measurement

2.Purge interface, the thread specification of solid-state radar purge interface is 1 / 8NPT, 8mm diameter fast purge connector on the interface

High-frequency radar level gauge parameters