KROHNE OPTISONIC 6300 Clamp-On Ultrasonic Flowmeter

Overview: Flow Measurement Without Cutting Into the Pipe

The KROHNE OPTISONIC 6300 is an ultrasonic clamp-on flowmeter for permanent installation, particularly suited to flow measurement of conductive and non-conductive liquids at any location where inline measurement is not possible or desirable. Because the sensor rails simply clamp onto the outside of an existing pipe rather than requiring the pipe to be cut and a wetted sensor inserted, the OPTISONIC 6300 can be installed on virtually any pipe up to DN4000 (160 inch) at any location, on new construction or as a retrofit, without process interruption.

As an authorized supplier of KROHNE flow instrumentation, Seven Star LLC sources and supplies the OPTISONIC 6300 clamp-on flowmeter to refineries, water utilities, and petrochemical facilities across Oman and the wider GCC. Because clamp-on ultrasonic measurement accuracy depends on correct sensor rail selection, spacing, and pipe surface preparation, Seven Star LLC helps engineering teams specify the correct OPTISONIC 6300 configuration for each pipe and application.

Measurement Principle

The OPTISONIC 6300 measures flow using the transit-time ultrasonic principle: two transducers integrated within a stainless steel sensor rail send ultrasonic pulses diagonally across the pipe, with the pulse traveling faster in the direction of flow and slower against it, and the flowmeter calculates flow velocity from this transit-time difference through the pipe wall and fluid. Because the sensors clamp externally rather than penetrating the pipe, there is zero pressure drop and no wetted parts to wear, foul, or require replacement.

For demanding applications, the OPTISONIC 6300 offers Dual path or X-mode configurations – two paired sensor rails with crossed measuring paths – delivering more stable and reliable measurement than a single-path arrangement, particularly valuable where flow profile disturbances or moderate installation constraints would otherwise degrade single-path accuracy. The flowmeter continuously measures actual volume flow, mass flow, flow velocity, velocity of sound, signal gain, and signal-to-noise ratio, giving operators direct visibility into both the process and the measurement’s own health.

Engineering Design of the OPTISONIC 6300

The 316L stainless steel sensor rail system is designed for quick, easy, and accurate installation – mountable to any pipe within minutes using KROHNE’s fixing units, with the same rail type usable in hazardous areas, extended-temperature applications, harsh offshore conditions, or as an IP68/NEMA 6P version for submerged installation. Fixed signal cables in a 5 m standard length, and up to a maximum of 30 m, connect the sensor rail to a wall-mounted or field-mounted UFC 300 signal converter, and solid coupling pads are available as an alternative to coupling grease to minimize maintenance, particularly for high-temperature applications up to 200°C.

The signal converter features pre-programmed pipe parameters and an installation wizard for quick measurement point setup, advanced diagnostics per NAMUR NE107, and can function as a heat energy calculator in addition to flow measurement. Communication options span 4-20 mA, HART7, Modbus, FOUNDATION Fieldbus, and PROFIBUS PA/DP, giving the OPTISONIC 6300 broad compatibility with existing plant control and monitoring systems.

Key Features

The KROHNE OPTISONIC 6300 Clamp-On Ultrasonic Flowmeter delivers non-invasive flow measurement without process interruption. Key characteristics include:

• External clamp-on sensor rails: no pipe cutting, no wetted parts, zero pressure drop.
• Suitable for pipes up to DN4000 (160 inch); process temperature up to +200°C.
• Dual path / X-mode configuration for enhanced measurement stability and reliability.
• 316L stainless steel sensor rails; IP68/NEMA 6P version for submerged applications.
• Installation wizard and pre-programmed pipe parameters for quick commissioning.
• Integrated thermal energy calculation and NAMUR NE107 diagnostics.
• 4-20 mA, HART7, Modbus, FOUNDATION Fieldbus, and PROFIBUS PA/DP communication.

Industrial Applications

The OPTISONIC 6300 is deployed across chemical addition lines, cooling water circuits, refined hydrocarbon pipelines, potable and deionized water systems, and general process control wherever an inline flowmeter cannot be installed, whether due to process interruption cost, pipe material, or retrofit constraints on an existing line. Its non-invasive design makes it particularly valuable for large-diameter utility and cooling water pipes where cutting into the line for an inline meter would be costly and disruptive.

Seven Star LLC supports refinery utility teams, water authorities, and petrochemical plant engineers across Oman, Muscat, Sohar, and the broader GCC region with sourcing of KROHNE OPTISONIC 6300 clamp-on flowmeters, helping projects add flow measurement points without process shutdown.

Technical Specifications

The table below summarizes the core specifications of the KROHNE OPTISONIC 6300 Clamp-On Ultrasonic Flowmeter as supplied by Seven Star LLC.

Accuracy, Approvals and Environmental Limits

Under reference conditions the KROHNE OPTISONIC 6300 achieves a measuring accuracy of ±1% of the measured value on pipes of DN50 / 2 inch and above at flow velocities greater than 0.5 m/s, with repeatability better than ±0.2%; a factory flow calibration is available where a tighter, application-specific figure is required. The signal converter is rated for ambient temperatures from –40 to +60°C, which covers both air-conditioned refinery control buildings and unshaded outdoor pipe racks in Oman without additional enclosure heating or cooling. For classified areas the sensor rails are available with ATEX intrinsic-safety approval as II 2 G Ex ia IIC T6…T4, and the field-mounted converter version carries II 2(1) G Ex de [ia] IIC T6, allowing a single measuring principle to be standardised across both safe and hazardous process areas on the same site.

Sensor construction is matched to the duty rather than to a single catalogue entry: standard aluminium transducer bodies cover –40 to +120°C, while the extended-temperature XT version reaches +200°C for refined hydrocarbon service, and 1.4404 / AISI 316L rails are specified where the external atmosphere is corrosive or salt-laden, as it is at coastal and offshore installations along the Omani seaboard.

Pipe Compatibility and Installation Requirements

Because the measurement is made through the pipe wall, the wall itself becomes part of the acoustic path, and the OPTISONIC 6300 is specified for this accordingly: it works on metal, plastic, ceramic, and asbestos cement pipes as well as internally or externally coated lines, with a wall thickness of up to 200 mm and a liner thickness of up to 20 mm. This tolerance for lined and coated pipework is precisely why the clamp-on approach is chosen on cement-lined potable water mains and coated cooling-water lines where an inline meter would mean breaking the lining.

For hydraulic conditions, KROHNE specifies a minimum straight run of 10 pipe diameters upstream and 5 diameters downstream of the sensor position. Seven Star LLC reviews isometrics against this requirement before quoting, because a measuring point placed too close to a pump, elbow, or partially open valve will degrade the achievable accuracy of the KROHNE OPTISONIC 6300 far more than any instrument specification will, and relocating the rails a few metres along the line is usually all that is needed.

Request a Quote for KROHNE OPTISONIC 6300 Clamp-On Ultrasonic Flowmeter

Seven Star LLC supplies the KROHNE OPTISONIC 6300 clamp-on ultrasonic flowmeter with full manufacturer documentation and regional technical support. Contact our instrumentation division for a formal B2B quotation, to confirm the correct sensor rail size and configuration for your pipe, or to obtain the complete technical datasheet. Seven Star LLC ensures every unit shipped across Oman and the GCC is genuine KROHNE hardware, correctly specified, and backed by local support.

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