Krohne Optisonic 7300 Ultrasonic Gas Flowmeter
Overview
The Krohne Optisonic 7300 is a universal 2-path ultrasonic gas flowmeter designed for process and utility gas measurement across oil and gas refineries, chemical plants, and petrochemical facilities. Using transit-time differential ultrasonic measurement with patented titanium transducers, the Optisonic 7300 provides accurate, maintenance-free volumetric flow measurement of natural gas, hydrogen, compressed air, and mixed process gases without any obstruction in the flow path.
As a trusted regional supplier for Krohne, Seven Star LLC supplies the Optisonic 7300 Ultrasonic Gas Flowmeter to oil and gas operators, refineries, and utility companies across the Sultanate of Oman and the wider GCC, with manufacturer documentation and local technical support.
Measurement Principle
The Krohne Optisonic 7300 measures gas flow using the transit-time differential method: pairs of ultrasonic transducers are mounted diagonally across the flow path, and each pair alternately transmits an ultrasonic pulse both with and against the direction of flow. Because a pulse traveling with the flow arrives faster than one traveling against it, the difference in transit time is directly proportional to the average gas velocity along that measurement path. With two independent measurement paths, the Optisonic 7300 compensates for flow profile distortion and delivers a more representative volumetric flow reading than a single-path design.
Since the measurement is entirely non-intrusive, with no moving parts and no obstruction placed in the gas stream, the Optisonic 7300 introduces no permanent pressure loss and requires no scheduled maintenance of wetted mechanical components. Patented titanium transducers, approved to NACE grade 29, resist the corrosive and erosive effects of raw and treated natural gas streams, sustaining measurement accuracy over long service intervals in continuous custody transfer and process monitoring duties.
Engineering Design of the Krohne Optisonic 7300
The Optisonic 7300 is available in flanged configurations from DN50 to DN1000 (2 to 40 inches) rated up to PN450 or ASME Class 2500, as well as weld-in connection options for permanent pipeline installation. The meter body and transducer housings can be specified in stainless steel, composite, or Inconel materials to match the corrosivity of the specific gas service, and the compact (C) or field-mount (F) electronics configurations allow the converter to be positioned according to installation access and hazardous-area requirements.
Integrated OPTICHECK diagnostic technology continuously monitors signal quality, transducer condition, and installation effects, allowing operators to verify meter health without physically inspecting the instrument. The converter provides three 4-20 mA outputs together with HART, Modbus, and FOUNDATION Fieldbus communication, and built-in volume correction to standard reference conditions allows the Optisonic 7300 to report both actual and standardized gas volumes directly, simplifying integration with custody transfer and allocation metering systems.
Key Features
The Krohne Optisonic 7300 combines proven ultrasonic gas measurement technology with a wide operating envelope suited to demanding gas processing applications:
- 2-path transit-time ultrasonic measurement compensates for flow profile distortion for standard volume flow metering.
- Dynamic turndown ratio of 100:1 on line sizes up to DN600 (24 inches) accommodates wide variations in gas throughput.
- Bi-directional flow measurement capability suits pipeline networks with reversible or variable flow direction.
- Patented NACE grade 29 titanium transducers resist the corrosive and erosive effects of natural gas, hydrogen, and process gas streams.
- Covers DN50 to DN1000 flanged line sizes rated up to PN450 / ASME Class 2500, with weld-in connections available.
- No moving parts and no obstruction in the flow path result in zero permanent pressure loss and maintenance-free long-term operation.
- Integrated OPTICHECK diagnostics continuously verify signal quality and transducer condition without physical inspection.
- Supports HART, Modbus, and FOUNDATION Fieldbus with three 4-20 mA outputs and built-in volume correction to standard conditions.
Industrial Applications
The Krohne Optisonic 7300 is widely applied in natural gas transmission and distribution metering, refinery and petrochemical process gas measurement, hydrogen flow monitoring, compressed air system metering, and flue gas measurement in utility and industrial plants. Its wide turndown ratio and freedom from pressure drop make it a strong fit for gas processing facilities and power generation plants across the Sohar and Salalah industrial zones, as well as broader upstream and midstream oil and gas operations throughout the GCC.
As the trusted supplier for Krohne, Seven Star LLC distributes the Optisonic 7300 to oil and gas operators, refineries, and gas utility companies throughout Oman and the wider GCC, with application engineering support for transducer material and mounting configuration selection.
Technical Specifications
The table below summarizes the principal specifications of the Krohne Optisonic 7300 Ultrasonic Gas Flowmeter.
| Parameter | Specification |
|---|---|
| Model | Krohne Optisonic 7300 |
| Measuring Principle | 2-path transit-time ultrasonic |
| Line Size Range | DN50 to DN1000 (2 to 40 in), flanged or weld-in |
| Pressure Rating | Up to PN450 / ASME Class 2500 |
| Process Temperature | Up to +180°C (+356°F) |
| Turndown Ratio | 100:1 (up to DN600 / 24 in) |
| Transducer Material | NACE grade 29 titanium (stainless steel, composite, Inconel options) |
| Applications | Natural gas, hydrogen, process gas, utility gas, compressed air, flue gas |
| Output / Protocols | 3 x 4-20 mA, HART, Modbus, FOUNDATION Fieldbus |
| Diagnostics | OPTICHECK integrated signal and transducer diagnostics |
Request a Quote for Krohne Optisonic 7300
Seven Star LLC invites oil and gas operators, refineries, and utility companies across Oman and the GCC to submit a formal request for quotation for the Krohne Optisonic 7300 Ultrasonic Gas Flowmeter. In Oman and the GCC, Seven Star LLC supplies common configurations on request, provides the manufacturer technical datasheet on request, and connects customers directly with our instrumentation division for mounting and material selection support. Contact Seven Star LLC today to receive a competitive quotation with current lead time and local technical support. The Krohne Optisonic 7300 is supplied on request for gas metering projects, with lead time confirmed at quotation.
Browse the full KROHNE range or see more Flowmeters products supplied by Seven Star LLC in Oman and the GCC.
- datasheet Krohne Optisonic 7300 Datasheet Download
KROHNE product families on this page
KROHNE names its instruments by measuring principle, which makes a tag list easy to read:- OPTIFLUX and WATERFLUX: electromagnetic flowmeters, such as OPTIFLUX 2300, OPTIFLUX 4300 and WATERFLUX 3070 for water networks
- OPTISONIC and ALTOSONIC: ultrasonic flowmeters, including the inline OPTISONIC 3400, the clamp-on OPTISONIC 6300, the OPTISONIC 7300 for gas and the ALTOSONIC V12 for custody transfer of gas
- OPTIMASS: Coriolis mass flowmeters such as OPTIMASS 1400 and 6400
- H250 M40 and DK800: variable area flowmeters
- OPTIWAVE and OPTIFLEX: radar and guided radar level transmitters
Where KROHNE flowmeters and level transmitters are used
Typical duties in the GCC are produced water and injection water metering, potable water and wastewater networks, fuel gas and sales gas measurement, chemical dosing, and tank level in terminals and process units. Coriolis meters cover mass flow and density on hydrocarbons, while electromagnetic meters need a conductive liquid.Ordering KROHNE instruments: what we need
Send the full type code and serial number from the nameplate, or a clear photo of it. For a new KROHNE flow meter we need line size and flange rating, liner and electrode material for electromagnetic types, fluid, flow range, pressure and temperature, power supply, output and protocol, and the hazardous area approval required. We check the code against KROHNE documentation before quoting and provide the manufacturer's datasheet and certificates on request.Browse KROHNE products by category: Flowmeters, Level Transmitter, Flow Computers.
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