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Radar Level Gauge
About OKet®
OKet® Group, founded in 2001, headquartered in Qingdao, is committed to leveraging advanced technologies such as new materials, sensors/automation instruments, software systems, loT, edge computing, big data, and Al in specialized fields to help customers achieve full-chain intelligent applications. These applications span chemical production and storage, hazardous chemical transportation, and retail operations at fueling stations.
OKet® Intelligent Products for Depot Applications:
Radar Level Gauge High-precision, stable level measurement for custody transfer and inventory control.
• AMF Mass Flow Meter Accurate mass flow metering for custody transfer and process control.
• Temperature Transmitter Reliable temperature monitoring for process safety and measurement accuracy.
• Preset Loading Controller Automated preset loading to reduce errors and improve depot efficiency.
• Expansion Box Flexible l/O expansion for seamless integration of multiple devices.
Product Introduction
OKet®offers a comprehensive range of advanced radar level gauges engineered for accurate and reliable level measurement in industrial applications. Utilizing non-contact radar technology, these instruments deliver stable performance in demanding environments such as vapor, dust, noise, and harsh operating conditions. OKet® radar level gauges are widely used for measuring crude oil, refined fuels, volatile liquids, slurry, powders. With high-precision measurement technology, they provide dependable results while reducing maintenance requirements.
OKet® radar systems offer flexible integration with temperature transmitters, pressure transmitters, density meters, and other field devices. This enables more accurate, reliable, and diversified solutions for terminal and tank farm inventory management.
Product models include:
• RTG7800 Radar Level Gauge
• RTG6000X Series Radar Level Gauge (RTG6000A/ RTG6000B Radar Level Gauge)
Principle
Principle of RTG7800 Radar Level Gauge: It is a Frequency Modulated Continuous Wave (FMCW) radar level gauge operating in the 76–81 GHz frequency band. It transmits modulated continuous radar signals and measures the distance by detecting the frequency difference between the transmitted signal and the echo reflected from the target, thereby obtaining accurate distance information between the radar level gauge and the medium surface. Its maximum measuring range can reach 30 meters.
Principle of RTG6000X Radar Level Gauge: It adopts a pulsed radar ranging system operating at 60 GHz, with a maximum measuring range of up to 16 meters. Its lens antenna emits narrow microwave pulses, which are reflected back by the surface of the measured medium and received by the antenna system again. Microwaves propagate at the speed of light, and the signal travel time from transmission to reception is proportional to the level in the vessel.
Product Composition
Main Components:
Radar signal core processing module (built-in)
• Transmits and receives radar signals to calculate liquid level height
Supports remote data transmission to secondary instruments via RS485
• Optimizes the beam angle for radar
LCD display panel
• Displays local parameters such as measured
Lens antenna
• Supports on-site parameter configuration via
Illustration: RTG7800 Radar Level Gauge
Technical Parameters
| Model RTG7800 | RTG6000X | |
| Center frequency | 76~81 GHz | 60 GHz |
| Wiring requirements | RVVP, 4*0.5 mm² | RVVP, 4*0.5 mm² |
| Maximum MeasuringRange | 30 m | 16 m |
| Antenna type | Lens antenna | Lens antenna |
| Process pressure | Ordinary pressure | Ordinary pressure |
| Process temperature | -40℃~60℃ | -40℃~60℃ |
| Accuracy | ±2 mm | ±5 mm |
| Power supply | DC 24 V | DC 24 V |
| Operating temperature | -40°C~60°C(LCD module Tamb.: $- 2 0 ^ { \circ } \mathsf { C } \widetilde { \mathbf { \Gamma } } { \sim } 6 0 ^ { \circ } \mathsf { C } )$ | |
| Pressure range | 0~1 MPa | 0~1 MPa |
| Protection rating | IP67 | IP67 |
| Ex-proof grade | Ex db IIC T6 Gb | Ex db IIC T6 Gb |
| Material | 304 stainless steel | 304 stainless steel |
| Signal output | RS485 | RS485 / 3-wire 4-20 mA |
| External ThreadMounting Size | 100 mm | RTG6000A: 60 mmRTG6000B: 100 mm |
| Process connection | Thread or flange connectionStandard flange: DN150(other specifications can becustomized) | Thread or flange connectionStandard flange:RTG6000A: DN80RTG6000B: DN150(other specifications can becustomized) |
Product Advantages
High Precision Measurement
RTG7800 Radar Level Gauge: Adopts an 80 GHz chip and applies FMCW radar technology with a 4 GHz operating bandwidth, achieving high-precision measurement of ±2 mm.
RTG6000X Radar Level Gauge: Adopts a 60 GHz high-frequency pulse radar ranging system with a measurement accuracy up to ±5 mm, offering better adaptability for measurements of specific media.
Excellent Environmental Adaptability
Highly resistant to interference: strong penetration capabilities, nearly unaffected by foam, condensation, and build-up.
Corrosion-resistant, high pressure-resistant, and high-temperature-resistant, ensuring stable measurements in extreme conditions.
Long Range & Small Dead Zone
Using lens antenna with narrow beam angle, reduces installation errors and interference. Concentrated energy can enhance echo capability while avoiding obstacles. Suitable for tanks of various sizes.
RTG7800 radar level gauge can measure up to 30 meters with minimal dead zone. RTG6000 radar level gauge can measure up to 16 meters.
Easy Installation
Supports flange or threaded connections for simple installation.
High Reliability & Low Maintenance
Made with high-quality materials to ensure accurate measurements in various environments and long-term stable operation.
Non-contact design reduces wear and contamination, simplifies installation and maintenance, and extends the equipment's lifespan while lowering maintenance costs.
Smart Communication and Automation
Supports RS485/3-wire 4-20 mA communication for easy integration with industrial automation systems, enabling smart management and remote monitoring.
Radar Level Gauge System
Temperature Transmitter
The temperature transmitter is specially designed for multi-point temperature monitoring of large storage tanks in the petroleum and chemical industries. Equipped with multi-channel high-precision probes and explosion-proof housings, it accurately captures temperature gradients inside tanks, supports remote data transmission, and provides reliable data support for tank metering, process control and safety management. Widely used in crude oil/product oil tanks, chemical synthesis towers, solvent storage tanks and other installations.
| Temperature measuring points | 3 points (customizable) |
| Measuring range | 10 m (customizable) |
| Accuracy | 0.3 ℃ |
| Protection rating | IP65 |
| Operating temperature | -40C~85°℃ |
| Communication interface | RS485 |
| Ex-proof grade | Ex d IIC T6 Gb |
Temperature Transmitter Features
Flexible configuration with single or multi-spot temperature sensors, enabling one or more measurement points across the tank.
High-accuracy temperature transmitters with calibrated multi-spot sensors for critical applications and precise net volume calculation
Supports improved measurement reliability and enhanced custody transfer accuracy.
Designed to ensure stable performance in demanding oil & gas storage and distribution applications.
Expansion-Box (Hybrid System)
Hybrid Console Connectivity
Acts as a bridge between field instruments and the Console Hybrid System for unified data collection.
Integration Capability
Supports integration with multi-brand temperature, density, and pressure transmitters.
Wide Power Input
AC 100–240V, 50/60Hz, suitable for global applications.
Low Power Consumption
Only 200W, energy-efficient and stable for continuous operation.
Harsh Environment Ready
Operates reliably from -30°C to 7 0 ^ { \circ } \mathsf { C } , 20%-90% RH (non-condensing).
Multi-Sensor Integration Hub
Supports ATG probes, radar level gauges, temperature transmitter and density/pressure transmitter in one system.
Highly Scalable System
Supports up to 16 channels for radar gauges, magnetostrictive gauges, and temperature sensors, plus 10 additional channels for pressure and density transmitters.
Advanced Temperature Measurement
Each channel supports 3-point temperature sensing for improved accuracy.
| Parameters | |
| Power supply voltage | AC 100–240 V |
| Power frequency | 50/60 Hz |
| Power consumption | 300 W |
| Operating temperature | -30°℃~70°℃ |
| Ambient humidity | 20%–90% RH (non-condensing) |
| Sensor supported | ATG Probe, Radar Level Gauge, Temp. Sensor |
| Number of radar level gauges supported | 1-16 channels |
| Number of magnetostrictive level gauges supported | 1-16 channels |
| Number of temperature sensors supported | 1–16 channels (each channel includes 3 temperature measurement points) |
| Number of Density / Pressure Transmitter | 1-10 channels |
Radar Level Gauge System Architecture
Process Connection Type
Installation Environment Requirements
Fixed roof without floating pan
Internal floating roof
External floating roof
Normal installation
Add stilling well
Unavailable
When a Stilling Well is Required:
• For internal floating roof tanks: a stilling well and reflector plate are required.
When the installation location is less than 1000 mm from the tank wall.
When there are obstructions inside the tank, or the liquid surface has significant foam or turbulence.
When the measured medium has a dielectric constant below 1.8, resulting in weak echo signals.
When there are other interfering structures inside the
Installation Guide
When mounting, the opening shall be located at 1/2R (where R is the tank radius), and the distance from the tank wall shall be greater than 1 m.
For dome-roof or conical-roof tanks: Do NOT install the instrument at the exact center of the top.
For flat-roof tanks: Installation at the exact center of the top is not recommended.
2 The microwave beam emitted by the antenna shall be kept away from the incoming material flow, and installation of the instrument directly above the feed inlet is prohibited.
3 should be at least 300mm to avoid medium contamination of the antenna.
When mounting, avoid tank internal fittings, such as: ladders, point level switches, heating coils, bracket, etc. If avoidance is not possible, medium level verification should be performed during installation. A reflector plate can be installed to redirect the reflected waves caused by interfering objects, preventing interference echoes.
|5 If the instrument is installed outdoors or in a humid, steamy environment, to prevent moisture (and avoid water entering the instrument), the cable sealing sleeve should be tightened. Additionally, the cable should be bent to be waterproof and fixed to prevent loosening and water ingress.
When a stirrer is installed inside the tank, the instrument shall be mounted as far away as possible from the stirrer and tank wall, generally in the area between the tip of the stirring blade and the tank wall.
Mounting on Reserved Location
Radar level gauges are typically installed on pre-fabricated flanges of the tank or vessel. To ensure the signal beam is perpendicular to the surface of the measured medium, the flange mating surface must be horizontal.
A short straight pipe, known as a riser, is usually present between the flange and the tank. The inner diameter of the riser must be at least 100 mm. If this requirement cannot be met, the tank roof must be modified according to the “Non-reserved location" installation guidelines.
Flange standard: EN 1092.1-2002
| Flange Selection Table | ||||
| Specifications | Outer diameter | Center hole | Number of holes | Aperture |
| DN150 | Φ285 | Φ240 | 8 | 22 |
| DN200 | Φ340 | Φ295 | 12 | 22 |
| DN250 | Φ405 | Φ355 | 12 | 26 |
Mounting on Non-Reserved Location
If no pre-fabricated opening is available, the tank roof must be retrofitted with a new riser pipe. The installation requirements are as follows:
① Riser pipe information
| Nominaldiameter | Nominalpressure | Connection standard | Flange type | Connectingsurface type | Purpose orname | Standpipeheight A |
| DN150 | 16 | EN 1092.1-2002 | WN | RF | Liquid levelgauge port | 150mm |
(The riser pipe height refers to the distance from the flange sealing surface to the intersection of the opening center line and the outer wall of the tank roof; there must be no shelter under the riser pipe opening.)
②The inner wall of the riser pipe should be clean and smooth, without defects such as stairs and bulges. It is fully welded after bedding-in and cutting at the point indicated by the arrow, and the flange butt joint surface is required to be horizontal. The type and size of the welded joints are in accordance with the regulations of EN 14015, all of which are penetration welded structures; the height of the fillet weld leg is the thickness of the thinner part, and the concave shape transitions smoothly.
Other Technical Requirements
1. The material of the pipe is S304 stainless steel, which complies with the requirements of ASTM A269-2004 "Standard Specifications for Seamless and Welded Austenitic Stainless Steel Pipe Products for General Purposes".
2. The surface of the stainless steel shall be pickled and passivated, and tested by the blue spot method. The product shall be qualified if there is no blue spot.
3. The manufacturing, inspection and acceptance shall comply with the requirements of EN
13445 "Non-combustion Pressure Vessels".
Installation Steps
Step 1
Drop the level gauge equipped with the adapter flange onto the riser flange smoothly, and align the bolt mounting hole.
Step 2
Rotate the level gauge clockwise, align the bolt mounting holes of the adapter flange and the riser flange in turn and observe the signal, and select the position with the strongest signal for fixing.
Step 3
Therefore, when the bolts are tightened, they must be pre-tightened first, and then tightened, diagonally pre-tightened and diagonally tightened to ensure the signal of the level gauge perpendicular to the surface of the measured medium after fixing. (Before tightening the bolts, a small amount of butter needs to be applied to prevent the bolts from rusting and facilitate maintenance)
Step 4
If it is installed in an explosion-proof area, it must comply with the installation regulations for national explosionproof hazardous areas.
Warning
The instrument contains electronic components that are susceptible to static electricity, so appropriate and effective electrostatic protection measures should be taken when disassembling and installing the internal components, and please follow the principles below.
The power supply of the instrument must be cut off.
When contacting, disassembling and installing internal components, operators should wear anti-static rings or take other safe and reliable grounding methods to ensure that the static electricity can be quickly and smoothly discharged.
OKet澳科
A caring and reliable business partner
QINGDAO OKET TECHNOLOGY CO., LTD
A: No. 16, Shoufeng Rd, Free Trade Zone, Qingdao 266555, China
T: +86 (0)532 86769572 E: info@oket-cn.com
W:www.oket-group.com
