PRODUCT
80GHz FMCW Radar Level Meter for Heavy-Dust and Corrosive Media
GLT742 is an 80GHz FMCW radar level meter operating at 76-81GHz, with an integrated PTFE lens antenna, a measuring range of up to 120m, accuracy of up to ±1mm and a blind area of only 0.08m. Its short wavelength, small beam angle and dust-resistant lens antenna suit large-diameter, heavy-dust and corrosive media such as pulverized-coal bunkers, grain silos, asphalt storage tanks and petrochemical vessels.
76-81GHzFMCW frequency
Up to 120mMeasuring range
Up to ±1mmAccuracy
0.08mBlind area
01
Characteristics
80G frequency modulation
Short wavelength, good penetration
GLT742 radar level meter uses frequency modulated continuous wave of 76-81GHz. The wavelength is relatively short, the reflection characteristics are better, and the interference from obstacles is relatively small, which is very advantageous in installation. Due to the small beam angle, the antenna size is also small. The product has the characteristics of large range, small blind area, good penetration, and the 5GHz working bandwidth improves the measurement resolution and measurement accuracy of the product.
Electromagnetic wave measurement
Large measurement range, high accuracy
GLT742 FM radar level meter adopts electromagnetic wave measurement technology. It has an 80G high frequency signal with good signal stability, and the range can reach up to 120m. Through advanced algorithms and procedures, the measurement accuracy can reach up to ±1mm, the signal stability is good, and it is less affected by factors such as temperature and pressure of the medium.
Lens antennas
Good media adaptability and small blind area
GLT742 FM radar level gauge adopts an integrated lens antenna. It has no trumpet shape, and can effectively avoid measurement errors because of dust adhesion. The lens antenna made of PTFE can effectively avoid medium corrosion. GLT742 is suitable for various powders and corrosive media. Its blind area can be up to 0.08m, which avoids data faults caused by entering the measurement blind area and raises the reliability of the measurement process.
02
Key Specifications
|
Parameter
|
Specification
|
|
Measurement principle
|
FMCW (frequency modulated continuous wave)
|
|
Frequency
|
76-81GHz (5GHz working bandwidth)
|
|
Measuring range
|
0~30m / 0~60m / 0~120m
|
|
Accuracy
|
±3mm / ±1mm
|
|
Blind area
|
Up to 0.08m
|
|
Output signal
|
4-20mA/HART, RS485
|
|
Power supply
|
24VDC, 220VAC
|
|
Antenna
|
Integrated lens antenna, PTFE
|
|
Process connection
|
Universal flange (used in pulverized-coal bunker case)
|
|
Cleaning / purge
|
Air source purge function (used in pulverized-coal bunker case)
|
03
Selection Notes
-
Large-diameter bunkers: the small beam angle means a smaller antenna and relatively small interference from obstacles, which is advantageous in installation.
-
Heavy-dust conditions: the integrated lens antenna has no trumpet shape, effectively avoiding measurement errors caused by dust adhesion; an air source purge function can be added.
-
Corrosive media: the lens antenna made of PTFE effectively avoids medium corrosion, making the meter suitable for powders and corrosive media.
-
Tall silos and tanks: the range reaches up to 120m with accuracy up to ±1mm, and the blind area is only up to 0.08m, avoiding data faults caused by entering the measurement blind area.
CASE
Customer Case
GLT742 Radar Level Meter in Thermal Power Plant Pulverized Coal Bunker
Background
A coal bunker in a China domestic thermal power plant, as the energy storage area of the entire power plant, the storage capacity of the coal bunker is of great significance to the entire production. The coal bunkers consist of lump coal bunkers, raw coal bunkers, and powder coal bunkers. It is needed to grasp the material storage capacity of each coal bunker for comprehensive coal management. Long term manual inspection has the disadvantages of poor efficiency and data unifying, which is not conducive to the allocation of resources by process managers. Therefore, it was decided to carry out automated transformation of coal bunker management.
Problems faced by customers include
-
The diameter of the coal bunker is relatively large between 20 and 40m. How to realize the storage conversion of the coal bunker through monitoring the material level?
-
The dust in the powder coal bunker is relatively large, then how to avoid the impact of dust on measurements?
-
How can the collected data be synchronized to the power plant's management platform to achieve visual management on the premise of realizing the control function?
Solutions
After an actual on-site visit to the customer, the customer currently has three lump coal bunkers: 25 meters in diameter and 40 meters in height; one raw coal bunker: 30 meters in diameter and 45 meters in height; two powder coal bunkers: 25 meters in diameter and 40 meters in height.
Considering that the actual material level is a tapered structure, and to realize the accurate transformation from material level to storage capacity (volume), two radar level meters are installed on both sides of the top of the coal bunker for material level monitoring. The background PLC collects material level information for average calculation, and obtains accurate coal reserves through height and volume conversion.
In view of the special working conditions of large dust in the pulverized coal bunker, the material level measurement adopts 80G FM radar, equipped with a universal flange and air source purge function. The wavelength of 80G radar is short, the beam angle is small, and it is strong enough to penetrate; the 80G FM radar level meter can prevent powder from affecting measurement and provide real and reliable data.
The collected data is connected to the power plant's VPN virtual private network through the PLC's wireless 4G routing to achieve remote visual monitoring of data.
FAQ
Frequently Asked Questions
How does an 80GHz FMCW radar level meter differ from low-frequency radar or ultrasonic sensors in dusty silos?
GLT742 uses a 76-81GHz frequency modulated continuous wave. The wavelength is relatively short, the reflection characteristics are better, and the interference from obstacles is relatively small, which is very advantageous in installation. The small beam angle also allows a smaller antenna, and the integrated lens antenna without a trumpet shape effectively avoids measurement errors caused by dust adhesion.
Why are two radar level meters installed on both sides of a large coal bunker, and how is material level converted into storage volume?
Considering that the actual material level is a tapered structure, two radar level meters are installed on both sides of the top of the coal bunker for material level monitoring. The background PLC collects material level information for average calculation and obtains accurate coal reserves through height and volume conversion.
How do the small beam angle and lens antenna affect installation in 20-40m diameter bunkers?
Due to the small beam angle, the antenna size is also small, and interference from obstacles is relatively small, which is advantageous in installation. In the pulverized-coal bunker case, the level measurement adopts 80G FM radar equipped with a universal flange and air source purge function for working conditions with large dust.
Which media can the PTFE lens antenna withstand, and how does it handle dust adhesion?
The integrated lens antenna has no trumpet shape and can effectively avoid measurement errors because of dust adhesion. The lens antenna made of PTFE can effectively avoid medium corrosion, and GLT742 is suitable for various powders and corrosive media.
How should the measuring range, process connection and purge function be selected for pulverized-coal or asphalt tank applications?
GLT742 is available with measuring ranges of 0~30m, 0~60m and 0~120m, with accuracy of ±3mm or ±1mm and 4-20mA/HART or RS485 output. In the pulverized-coal bunker case a universal flange and air source purge function were used to handle heavy dust; selection should match the vessel height, the dust level and the installation opening on site.
What measuring range and accuracy does the GLT742 provide?
The range can reach up to 120m, and through advanced algorithms and procedures the measurement accuracy can reach up to ±1mm. The blind area can be up to 0.08m, which helps avoid data faults caused by entering the measurement blind area.
