Introduction
80GHz high frequency non contact type radar level transmitter , from Beijing Gallop as industrial instrumentation supplier, has the advantages of high accuracy, narrow beam, large range and good stability. A wide range of models are available, such as high temperature resistant type, corrosion resistant type, 120meters long range type and more.
Model: GRD-80G
MOQ: 1PCS
Payment: Bank transfer/ Wire transfer
Lead Time: 5-7 days
OEM/ODM: Available
◆ Highly accurate measurement: The industrial level transmitter can provide very accurate level measurement results, and the error is usually small, which ensures the accurate measurement and control of materials in the production process.
◆ Suitable for a variety of media: whether it is liquid, solid or slurry and other different forms of media, can be effectively measured.
◆ Small blind zone: due to the high frequency characteristics, the measurement blind zone is small, can be closer to the top and bottom of the measurement vessel, improve the effective range of measurement.
◆ Rapid response: radar level transmitter can quickly reflect the changes in liquid level, real-time, suitable for processes that require rapid adjustment of liquid level.
◆ Non-contact measurement: not in direct contact with the measured medium, will not be affected by corrosion, wear and tear of the medium, reducing maintenance costs and the possibility of equipment failure.
◆ High reliability: has a long service life and stable performance, can be in the harsh industrial conditions of long-term reliable operation.
| Parameter | Description |
| Frequency | 76GHz~81GHz |
| Range | 0.1~120m |
| Accuracy | ±2mm |
| Beam angle | 3°、8° |
| Using dielectric constant | >=2 |
| Voltage | 18~28.0VDC |
| Protocol | HART/MODBUS |
| output | 4~20mA/ HART or RS-485 |
| Fault output | 3.8mA、4mA，20mA，22mA，keep |
| Display | 128×64 Dot matrix display screen/4 buttons |
| Temperature/humidity | -40~85℃/≤95%RH |
| Housing material | Aluminum alloy/ stainless steel |
| Antenna type | Lens antenna, can be equipped with lens antenna cover/anti-corrosion antenna/antenna heat dissipation paste/quartz isolation flange plate |
| Process pressure | -0.1~2MPa |
| Electrical interface | M20*1.5/ 1/2'' NPT |
| cable | AWG18 or 0.75mm² |
| Protection level | IP65 |
| Installation | Thread/ flange |
Almost all media can be measured, even under high pressure and high temperature environment, the measurement is still stable and reliable; a variety of antenna structure, can measure corrosive liquids, can also be used in food and pharmaceutical manufacturing; solid lumps, dust, stirring, adhesion, condensation and other working conditions have the perfect solution.
Host Dimension：(unit: mm)
Probe Dimension：(unit: mm)
The following table compares the measurement range, accuracy, beam angle, temperature and pressure conditions, and protection class for liquid, solid and different antenna configurations.
| Model | Medium | Measurement Range | Accuracy | Beam Angle | Temperature and Pressure | Protection Class | Photo |
|---|---|---|---|---|---|---|---|
| GRD-80G-01 | Liquids, especially corrosive liquids | 0.15m~15m | ±2mm | 5-8° | -40~80℃ / Max 2.5MPa | IP67 |  |
| GRD-80G-02 | Liquids | 0.15m~35m | ±2mm | 5-8° | -40~80℃ / Max 2.5MPa | IP67 |  |
| GRD-80G-03 | Solids | 0.3m~120m | ±2mm | 3° | -60~120℃ / Max 2.5MPa | IP67 |  |
| GRD-80G-05 | Liquids, especially corrosive liquids | 0.15m~15m | ±2mm | 5-8° | -40~80℃ / Max 2.5MPa | IP67 |  |
| GRD-80G-07 | Solids | 0.3m~120m | ±2mm | 3° | -60~150℃ / Max 2.5MPa | IP67 |  |
| GRD-80G-08 | Solids | 0.3m~120m | ±2mm | 3° | -60~200℃ / Max 2.5MPa | IP67 |  |
a. Thin foam (<5 cm): The 80G millimeter-wave can penetrate the foam layer and capture the water-surface echo normally, so the measurement remains basically stable.
b. Thick, dense wet foam (>10 cm): Due to the high dielectric constant of foam, the radar wave tends to reflect on the top surface of the foam. The foam top may be misidentified as the actual water surface, leading to an over-estimated water level and falsely high flow rate. Turbulently rolling foam causes signal scattering, resulting in frequent jumping and large fluctuation of readings.
c. Dry foam and lightweight floating bubbles: The radar signal has good penetration, with little interference to measurement.
a. Slight dust emission: The narrow-beam 80G radar is barely affected and can perform normal measurement.
b. High-concentration, continuous dust: Dust particles scatter and absorb high-frequency millimeter-wave energy, which attenuates the radar signal, weakens the echo and reduces the signal-to-noise ratio. In severe cases, the echo signal is lost, and the measured value jumps with unstable data output.
a. A small amount of water mist at ambient temperature: Hardly any influence on measurement.
b. High-temperature saturated steam: Water vapor absorbs millimeter-wave energy and causes signal attenuation. When steam meets the cold radar antenna, a condensed water film will form on the antenna surface, which changes the antenna transmission characteristics, leads to water-level drift and increased measurement error. Under extreme conditions, no valid echo can be received and measurement fails.
Condensation includes condensation on the antenna surface and water condensation on the inner tank wall.
a. A continuous water film formed on the antenna lens: The radar wave reflects directly on the water film, resulting in serious measurement distortion, permanently high water-level reading and measurement failure.
b. Intermittent condensation and dripping water droplets: Instantaneous false echoes are generated, which occasionally cause value jump and unstable measurement data.
a. Agitation causes severe water-surface fluctuation and vortexes. The water level keeps rising and falling, and the instantaneous water-level reading drifts constantly.
b. If the agitator blade falls within the radar beam coverage, strong false echoes will be reflected by the blade. The instrument may mistake the blade position for the water-surface level, which causes considerable measurement error.
Note: The 80G radar features a narrow beam. Interference can be greatly reduced as long as the installation position keeps the agitator blades out of the radar beam.
When sludge, oil or viscous medium adheres to the transmitting surface of the radar antenna:
a. The antenna impedance is changed, the transmitting and receiving performance of radar signals deteriorates, and the echo intensity decreases.
b. The radar wave is directly reflected by the surface of the adherent material. The instrument locks the distance to the adherent, the measured value stays fixed and fails to respond to the real-time water-level change, resulting in complete measurement failure.
c. Thicker adherent deposits lead to larger measurement error. Antenna adhesion is one of the most common causes of failure for radar flowmeters.
Installed at the diameter of the silo (1/4-1/6), keep a minimum horizontal distance of 200mm from the silo wall, otherwise it is likely to produce false readings, and the instrument needs to be installed vertically (flange surface horizontal) when measuring liquids.
Note:
(1) Datum
(2) Container center or axis of symmetry
The silo body with stockpile is perpendicular to the incident surface.
Because the inclined solid surface will cause echo attenuation, and even the problem of loss of signal, the lens antenna should be as perpendicular as possible to the material surface. If the material surface is uneven, the universal flange is recommended to adjust the angle of the lens antenna.
Ensure that there are no interferences in the beam range, such as ladders, steps, etc. As shown in the figure below:
When measuring solid materials, the instrument should be installed to ensure that the antenna beam avoids the feed port and is perpendicular to the material surface, as shown in the figure below:
