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Brand: KROHNE
KROHNE OPTIWAVE 6500 80 GHz Radar Level Transmitter for Powders
Description
Two-wire 80 GHz radar for silos, dust and low-reflective powders
The KROHNE OPTIWAVE 6500 is a two-wire, loop-powered 80 GHz FMCW radar level transmitter for continuous non-contact measurement of powders and granulates. KROHNE positions it for powders and dusty atmospheres, with a measuring range of 0 to 100 m (0 to 328 ft) and a best accuracy of +/-2 mm (+/-0.08 in). The flush-mounted PEEK lens antenna does not intrude into the tank, so material cannot build up on a protruding horn.
The manufacturer highlights a small 4 degree beam angle for the DN70 antenna, which helps in tall, narrow silos and hoppers, together with an empty tank spectrum function that filters false reflections from internals. Typical duties named on the product page are cement, lime, fly ash, plastic powder, milk powder, flour and coal dust, plus metals and minerals processing.
Technical specifications
| Parameter | Specification |
|---|---|
| Model | OPTIWAVE 6500 (C compact; F remote variants listed in the data sheet) |
| Principle | Radar (FMCW), 80 GHz, two-wire loop-powered |
| Measured media | Powders and granulates (solids) |
| Measuring range | 0 to 100 m / 0 to 328 ft |
| Accuracy (best) | +/-2 mm / +/-0.08 in |
| Process temperature | -50 to +150 C / -58 to +302 F (page); description mentions up to +200 C |
| Process pressure | -1 to 40 barg / -14.5 to 580 psig |
| Flanges | EN 1092-1 DN50 to DN200 PN40; ASME 2 to 8 in Cl 300; JIS 50 to 200A 10k |
| Threads | G1.5, G3, 1.5 NPT, 3 NPT (male) |
| Antenna material | PEEK lens antenna; PTFE option |
| Outputs | 4 to 20 mA HART 7, FOUNDATION Fieldbus, PROFIBUS PA |
| Protection | IP66/68, NEMA 4X/6P; ambient -40 to +80 C |
| Approvals as printed | ATEX, cQPSus, IECEx, NEPSI, EAC Ex, KCs; DNV marine; WHG; SIL 2/3; CRN / ASME B31.3 |
Where it is used
Choose it when dust, low reflectivity or internal obstructions make 24 GHz units unreliable. The page lists silos, stockpiles, conveyor belts, shafts, bunkers and crushers as measuring points, and a maximum level change rate of 60 m/min.
An optional 112 mm antenna extension suits long nozzles, and a purging system can keep the antenna clean. Tank Bottom Management is included so that an empty vessel still gives a stable reading.
Selecting the version
Specify antenna and seal material (EPDM, FKM or Kalrez 6375 are listed), process connection, housing, output and approval. As a derived example, a tall cement silo with dust points to the DN70 lens antenna with a flange sized to the nozzle.
The data sheet of this page is the TD for the OPTIWAVE 6500 C. Always confirm the complete device code, the hazardous-area marking and the SIL certificate against your plant documents before ordering.
Installation practice matters for any radar. Keep the antenna away from the filling stream, mount it on a nozzle that matches the antenna extension, and use the empty-tank spectrum recorded at commissioning so that weld seams and ladders are ignored. In very dusty silos the purging connection keeps the lens clean, and the data sheet gives antenna dimensions and weights for planning.
Documents and quotation
Quote requests are handled from this page: attach your tag list or the full code, and note the antenna, process connection and approval. The attached PDF (KROHNE OPTIWAVE 6500 C technical datasheet (EN)) is the reference for every value above, and it should be checked again for the final configuration. See also Level Instrumentation.
Datasheets & Documents
- Datasheet KROHNE OPTIWAVE 6500 C technical datasheet (EN) Download
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About brand
KROHNE is the German flow and level measurement company founded in Duisburg in 1921 as Ludwig Krohne & Sohn. Its first customers were Ruhr steel producers, for whom it built variable area flowmeters. KROHNE dates the first electromagnetic flowmeter for industrial process measurement to 1952. It is still family-owned and headquartered in Duisburg.
Seven Star LLC is an independent supplier in Muscat. We list KROHNE electromagnetic, Coriolis, ultrasonic and variable area flowmeters, radar level transmitters and flow computers, and supply them to water utilities, oil and gas and process plants in Oman and the GCC by order code.
KROHNE company profile
| Established | 1921, Duisburg, Germany, as Ludwig Krohne & Sohn |
|---|---|
| Early products | Variable area flowmeters for hardening furnaces in the Ruhr steel industry |
| Milestone | 1952: first electromagnetic flowmeter for industrial process measurement, according to KROHNE |
| Product families | Electromagnetic, Coriolis, ultrasonic, vortex and variable area flowmeters, radar and guided radar level, flow computers and metering systems, analysers |
Milestones
- 1921: Ludwig Krohne starts making variable area flowmeters in Duisburg for hardening furnaces in the Ruhr steel industry.
- 1952: First electromagnetic flowmeter for industrial process measurement, according to KROHNE.
- 1980: First ultrasonic flowmeter delivered to Shell for crude oil measurement.
- 1985: Development and production of Coriolis mass flowmeters begins.
- 1994: First Coriolis mass flowmeter with a single straight measuring tube.
- 1996: ALTOSONIC V, the first ultrasonic meter for custody transfer of liquids.
KROHNE products we list
| Family | Models | Typical use |
|---|---|---|
| Electromagnetic flowmeters | OPTIFLUX 2000, 2100, 2300, 4100, 4300, WATERFLUX 3070, 3100, 3300 | Water networks, wastewater, seawater intake and conductive process liquids |
| Coriolis mass flowmeters | OPTIMASS 1400, 6400 | Direct mass flow and density of hydrocarbons, chemicals and LPG |
| Ultrasonic flowmeters | ALTOSONIC V12, OPTISONIC 3400, 6300 clamp-on, 7300 gas | Gas custody transfer, liquid process flow and non-intrusive clamp-on checks |
| Variable area flowmeters | H250 M40, DK800/R | Simple, power-free flow indication for purge, sample and utility lines |
| Level | OPTIFLEX 7200 guided radar, OPTIWAVE 5400, 7500, 1540, OPTISWITCH 5300 | Level in tanks, separators and chemical storage, and point level switching |
| Flow computer | SUMMIT 8800 | Fiscal and custody transfer calculations for gas and liquid metering |
The flowmeter principle follows the medium. Electromagnetic meters need a conductive liquid, have no moving parts and no pressure loss, and suit water and slurries. Coriolis meters measure mass flow and density directly, so they work for hydrocarbons and non-conductive liquids. Ultrasonic meters handle gas and large pipes, and multi-path designs such as the ALTOSONIC V12 are used for custody transfer. Variable area meters need no power at all and give a simple local reading.
Where KROHNE instruments are used
In Oman and the GCC, KROHNE flowmeters and level transmitters are used in water transmission and distribution, desalination, wastewater, oil and gas production and fiscal metering, refineries, petrochemical and chemical plants, and power stations.
Ordering KROHNE instruments: what we need
Send the complete KROHNE order code or the nameplate data. For a new meter, send the medium, the flow range, pressure and temperature, the pipe size and flange rating, the liner and electrode materials (for electromagnetic meters), the output and communication, and the hazardous area classification.
Facts checked against KROHNE company history (100th anniversary), October 2026.
Browse KROHNE products by category: Flowmeters, Level Transmitter, Flow Computers.
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Frequently Asked Questions
What media does it measure?
Powders and granulates in silos, hoppers and buffer containers, including dusty atmospheres.
How far can it measure?
The page gives 0 to 100 m (0 to 328 ft) with a best accuracy of +/-2 mm.
Which outputs are available?
4 to 20 mA with HART 7, FOUNDATION Fieldbus or PROFIBUS PA.
Is a SIL version listed?
Yes, the page lists SIL 2/3 among its approvals.
Does it need antenna aiming?
No kit is needed for angle of repose, but a slanted flange and orientation system are listed as accessories.
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