120GHz Radar Level Transmitters

Application: Solids
Measuring Range：0.3m~150m
Protection Grade：IP67
Accuracy：± 5mm (range below 35m)
Frequency: 123GHz
Process Pressure：-0.1~0.3MPa
Process Temperature：-40~110℃
Process Connection：Flange ≥DN80
Explosion proof certification:Exia IIC T6 Ga / Exd ia IIC T6 Gb / Ex ia D20 T85℃
Outer Covering：Aluminum / Plastic / Stainless steel
: M20x1.5 1/2NPT
Power supply : Two wire system /dc24v Four wire system /dc12~24v Four wire system /ac220v
Signal output : Two wire system 4 20ma/hart protocol Four wire system 4 20mA/ RS485 Modbus
MOQ 1 SET
Payments: TT, Paypal, Credit card, Western union
Shipping ways: Express(DHL,Fedex,TNT,EMS,UPS)/Air/Sea

1 Overview

The FMCW radar level meter antenna transmits a frequency modulated continuous wave signal (76-81GHz) at the speed of light. On encountering the surface of the measured substance, part of its energy is reflected back into the same antenna. This echo signal mixed with the transmitted one results in an output intermediate frequency signal whose frequency is proportional to the distance from the antenna to the medium. Thus, calculating this distance becomes possible.The KD-FMF series sensor is a 120G frequency modulation radar type level measuring instrument with a measuring distance of up to 30 meters. The antenna is further optimized, and the new and fast microprocessor can perform higher-speed signal analysis and processing, so that the meter can be used for measuring high temperature and high pressure and other environmental liquids.

2 Product Principle

Grain gauge bin level indicator used in industry mainly have three bands, namely C-band, K-band, and W-band. The emission frequencies of different bands are different, and the product performance also varies.We produce millimeter-wave radar level meters in the W-band and 76-81GHz.

The general principle of the FM continuous wave radar level gauge is that the radar emits electromagnetic waves on the top of the tank, and the electromagnetic waves are received by the radar after being reflected by the medium. The frequency difference δ f between the received signal and the transmitted signal is proportional to the distance R from the surface of the medium. : R= C (speed) *δ f (frequency difference) /2/K (frequency modulation slope). Because the speed of light C and the frequency modulation slope K are known, the frequency difference δ f can be estimated to obtain the distance R of the material surface at the radar installation position, and then through the known total height of the tank, subtract the spatial distance from the radar to the material surface ( Referred to as the air height), the height of the material grain bin level indicator is obtained.

3 Protection Grade

This meter fully meets the requirements of protection class IP66/67, please ensure the waterproofness of the cable sealing head. As shown:

How to ensure that the installation meets the requirements of IP67:

Make sure that the sealing head is not damaged.

Make sure that the cable is not damaged.

Make sure that the cables used meet the requirements of the electrical connection specifications.

Before entering the electrical interface, bend the cable downward to ensure that water does not flow into the housing, see ①

Please tighten the cable sealing head, see ②

Please block the unused electrical interfaces with blind plugs, see ③

4 Product Specification

Measuring medium: solid

Measuring range: 0.3m~120m

Process connection: flange ≥DN80

Process temperature: -40～110℃

Process pressure: -0.1～0.3MPa

Precision: ±5mm

Protection level: IP67

Frequency range: 120GHz

Power supply: two-wire system (DC24V)/four-wire system (DC12V~24V)/four-wire system (AC220V)

Explosion-proof grade: Exia ⅡC T6 Ga / Exd IIC T6 Gb

Housing: Aluminum/Plastic/Stainless Steel

Signal output: two-wire system 4…20mA/HART protocol/four-wire system 4…20mA /RS485 Modbus

Appearance Of Size

Technical Parameters

Process connection	Flange
Material	316 stainless steel, PP
Shell	Seal between housing and housing	Silicone Rubber
	Shell window	Polycarbonate
	Ground terminal	Stainless steel
Supply voltage	four-wire system	Standard	（12~24）V DC
		Power consumption	max80mA DC24V/2W
		Allow ripple	＜100Hz	Uss＜1V
			（100~100K）Hz	Uss＜10mV
	Shell	(198~242)V AC	four-wire system
		100V AC	four-wire system
Cable parameters	Cable entry/plug	1 M20x1.5 cable entry
		1 blind plug M20×15
	Ground terminal	Conductor cross section 2.5mm2
Output parameters	output signal	（4~20）mA/RS485Modbus
	Resolution	1mm
	Fault signal	Current output unchanged; 20.5mA; 22mA; 3.9mA
	Integration time	(0~20)s, adjustable
Blind spot	0.1m/0.2m/0.3m
Maximum measurement interval	150 meters
Measuring distance	About 1 second (depending on parameter settings)
Adjust the time	About 1 second (depending on parameter settings)
Adjust time, working storage and transportation temperature	（-40~80）℃
Process temperature	YURA-FMF11	-40~80℃
	YURA-FMF12	-40~110℃
	YURA-FMF13	-40~110℃
	YURA-FMF15	-40~200℃
	YURA-FMF21	-40~110℃
Relative humidity	＜95%
pressure	Max2.5MPa
Shockproof	Mechanical vibration 10m/s2, (10~150)Hz

Instrument Linearity

Installation Requirements

When installing the instrument, avoid installing it above the inlet, and try to avoid all kinds of objects that affect the signal, such as stirring paddles, etc.

Under extremely complicated working conditions, the instrument can work normally if there is no obstacle in the area of 500px radius with the radar installation point as the

Advantages and applications of FMCW radar level transmitter advantages

1. High signal strength

The radar antenna transmits ultra-high frequency radar signals (76~81GHz), with a higher signal-to-noise ratio and is hardly affected by material level fluctuations;

It can effectively measure materials with low reflectivity, oil and powder with low dielectric constant can also be perfectly measured;

2. Strong anti-interference

Higher signal-to-noise ratio makes radar measurements almost unaffected by level fluctuations;

The antenna is made of PTFE material, which can effectively prevent corrosion and hang materials;

In measuring tanks and silos with dust, condensation, attachments, etc., the radar wave can penetrate and directly reach the surface of the material level.

3. Small beam angle

Beam angle up to 3°

The extremely narrow beam angle makes the radar energy more focused; it can be used in narrow and long installation spaces without interference from false echoes; even if there are obstacles in the tank, such as stirring, heating coils, etc., the radar energy is concentrated; even if the range is up to 100m, the signal will not be too much attenuated. , the extremely narrow beam angle can also be successful Avoid, achieving accurate measurement.

4. Metrology-grade accuracy, small blind area

The measurement accuracy can reach ±1mm;

The blind area is less than 5cm;

Small blind areas and high precision make the radar suitable for measuring small storage tanks in industries such as medicine, petrochemicals, food, chemical and others.

FMCW radar level transmitter application：

*The blind area of product measurement is in the range of 7-8CM, which is suitable for the measurement of small storage tanks

*The product can reach 120M measurement range, suitable for the measurement of super large storage tanks

*The electromagnetic wave emission angle of the product is less than 3°, which is suitable for measurement in narrow spaces or guided wave pipes

*The product has extremely high measurement accuracy and is suitable for high-precision metrology-grade measurement

Echo processing algorithms are rich in the product, along with experience data from various environments and working conditions; it has unique characteristics for extremely harsh working conditions like strong dust and steam, or for storage tanks with special processes like stirring and heating rods, which other similar products don’t have.

120GHz Radar Level Transmitters