S-Series Straight-Tube Coriolis Mass Flowmeter for Accurate Industrial Measurement

Modern process plants require more than a simple indication of liquid or gas movement. Operators need dependable mass flow data, density information, temperature measurement, batch control, diagnostic support and communication with automation systems. At the same time, the measuring instrument must create as little pressure loss as possible, tolerate demanding media and remain stable in difficult industrial environments. The S-Series straight-tube Coriolis mass flowmeter is designed to address these requirements through direct mass measurement, integrated density measurement and a low-restriction dual-tube construction.

Unlike volumetric flowmeters that infer mass from volume and assumed density, a Coriolis meter measures the effect of fluid movement on vibrating measurement tubes. This allows the instrument to determine mass flow directly, while the oscillation response provides density data and integrated sensors provide process temperature. The result is a multifunctional measurement platform for liquids, gases, liquefied gases, viscous products, selected suspensions and other process media within the applicable operating range.

The KSMF-S design combines two parallel straight measuring tubes with a controlled excitation system and precision sensing technology. Its straight flow path reduces internal obstruction, limits pressure loss and simplifies cleaning. The construction is particularly attractive for food, pharmaceutical, chemical, energy, oil and gas, water treatment and general process applications where measurement accuracy and installation flexibility are equally important.

Why Direct Mass Measurement Matters

Many industrial processes are controlled by mass rather than volume. Recipes, chemical dosing, product loading, custody transfer, blending and inventory calculations are often based on kilograms or tonnes. A volumetric flowmeter can provide excellent results when the fluid density is stable and the temperature remains controlled. However, changing temperature, pressure, composition or concentration can cause the relationship between volume and mass to change.

A Coriolis mass flowmeter responds directly to the moving mass of the fluid. It does not need a separate pressure and temperature compensation system to convert a measured volume into mass for many common applications. This can simplify the measurement loop and reduce the number of instruments needed for process control.

The S-Series also measures density as part of its operating principle. Density data can be used for concentration monitoring, product identification, quality control, phase-change detection and process optimization. Process temperature is measured by integrated sensors, while volume flow can be calculated from the mass flow and density values. A single meter can therefore supply several process variables to a control system.

Direct mass measurement is especially valuable when the process involves high-value materials, variable-density products or accurate dosing. In a chemical batch, a small mass error can affect the final formulation. In a fuel blending operation, the density and mass balance influence product consistency and commercial records. In a food or pharmaceutical process, reliable batch data supports quality assurance and traceability.

Operating Principle of the Straight-Tube Design

The S-Series contains two parallel measuring tubes that are excited into controlled oscillation by an electromagnetic drive system. Sensors monitor the movement of the tubes at the inlet and outlet portions. When there is no flow, the signals from the two sensing locations remain substantially in phase.

When fluid passes through the vibrating tubes, Coriolis forces act on the fluid and tubes. The inlet portion of each tube experiences a force in one direction, while the outlet portion experiences a force in the opposite direction. This produces a small but measurable twisting effect and a phase difference between the sensor signals. The measured time or phase shift is proportional to mass flow.

The tubes also vibrate at a frequency influenced by the mass contained within them. This oscillation frequency is used to determine fluid density. A temperature sensor monitors the process temperature so that the transmitter can compensate for thermal effects and provide additional process information.

This measuring principle has several important advantages. It does not depend primarily on a velocity profile, does not require an internal rotor or impeller and is not based on an artificial pressure drop across a restriction. It also provides mass flow and density from the same sensing assembly. The instrument can consequently support applications that would otherwise require separate flow, density and temperature devices.

Advantages of the Straight Dual-Tube Construction

Low Pressure Loss

A straight-tube meter generally presents a more open flow path than many bent-tube Coriolis designs. The fluid does not need to make a sharp internal turn through a curved sensor body. This helps reduce flow resistance and conserve pumping or compression energy. Low pressure loss is important in systems with limited pump head, long pipelines, high-viscosity products or expensive compressed gases.

Lower pressure loss can also improve the overall economics of a process installation. A smaller pump or compressor may be sufficient, or an existing system may achieve a higher throughput without major modifications. In energy-sensitive plants, reducing unnecessary pressure loss contributes to more efficient operation over the service life of the equipment.

Low Shear

Some products are sensitive to mechanical stress. Emulsions, biological materials, polymers, suspensions and delicate food products can be affected by excessive shear. The straight dual-tube flow path is designed to reduce unnecessary changes in direction and minimize the mechanical disturbance imposed on the fluid. Actual performance depends on the product, velocity and installation, but the geometry is well suited to applications where gentle handling is desirable.

Easy Cleaning and Drainability

Cleanability is a major consideration in hygienic processing. Dead zones, internal pockets and difficult-to-reach surfaces can complicate cleaning and create contamination risks. The straight-tube design provides a comparatively direct passage through the sensor, supporting cleaning-in-place procedures when the meter is selected with suitable materials, connections and surface specifications.

For food, beverage, pharmaceutical and biotechnology applications, the process connection may be supplied in a hygienic configuration such as a Tri-Clamp style connection. Selection must consider the applicable sanitary standard, surface finish, gasket material, cleaning chemicals, sterilization temperature and validation requirements. The meter itself is a measurement component; complete hygienic compliance depends on the full installation and the selected model configuration.

Reduced Installation Sensitivity

The S-Series does not require upstream or downstream straight pipe runs in the same way as many velocity-based flowmeters. Because Coriolis measurement is largely independent of the conventional velocity profile, the meter can often be installed close to elbows, valves, reducers and other pipe components. This is useful in compact skids, retrofit projects and crowded process areas.

Although straight-run requirements are minimized, good piping practice remains important. The meter should be supported correctly, protected from excessive vibration and installed so that the tubes remain full when liquid measurement is required. Valves, pumps and regulators should be positioned to avoid unstable flow conditions, cavitation or unwanted gas entrainment.

Product Performance and Configuration Range

The KSMF-S family covers a broad range of industrial measurement requirements. Depending on the selected model and application, the product range includes nominal line sizes from approximately DN8 to DN150, corresponding broadly to one-quarter inch through six inches. Flow capacity extends across the complete size range up to approximately 480,000 kilograms per hour, although the actual operating range is model-specific.

Available accuracy classes include approximately plus or minus 0.1 percent, 0.15 percent, 0.2 percent and 0.5 percent of rate. Repeatability is typically in the range of 0.05 to 0.1 percent of rate. The selected accuracy depends on meter size, fluid properties, calibration, installation conditions and the operating point. Users should therefore confirm the exact performance with the model datasheet and application sizing information.

The density measurement range is approximately 0.3 to 3.0 grams per cubic centimeter, with liquid density accuracy reaching up to approximately plus or minus 0.002 grams per cubic centimeter in suitable conditions. This capability allows the transmitter to calculate volume flow and support concentration or composition-related functions where the relationship between density and product quality is established.

Temperature options include low-temperature service down to approximately minus 200 degrees Celsius, normal process service from approximately minus 50 to plus 200 degrees Celsius and high-temperature service up to approximately plus 300 degrees Celsius, depending on the sensor option and model. Pressure ratings include standard configurations around 4 MPa and high-pressure options that may reach approximately 25 to 40 MPa for suitable models.

Parameter	Typical S-Series Capability	Selection Consideration
Measurement principle	Straight dual-tube Coriolis measurement	Confirm the model and tube configuration for the application
Measured variables	Mass flow, density and temperature	Volume flow can be calculated from mass flow and density
Media	Liquids, gases and liquefied gases	Check pressure, temperature, viscosity and multiphase conditions
Accuracy classes	Approximately ±0.1%, ±0.15%, ±0.2% or ±0.5% of rate	Application- and model-dependent
Repeatability	Typically 0.05% to 0.1% of rate	Verify at the expected flow range
Density range	Approximately 0.3 to 3.0 g/cm³	Density performance depends on fluid and operating conditions
Nominal line size	Approximately DN8 to DN150	Select size according to normal, minimum and maximum flow
Process temperature	Approximately -200°C to +300°C, option-dependent	Use the appropriate low-, normal- or high-temperature sensor design
Pressure rating	Standard ratings up to approximately 4 MPa; higher options available	Confirm design pressure, test pressure and connection rating
Wetted materials	Stainless steel 316L; Hastelloy and titanium options	Check corrosion compatibility with the process medium
Connections	Flanged, threaded, Tri-Clamp and fitting-type versions	Match the plant standard and hygienic requirements
Protection	IP67; explosion-proof options available	Confirm the certificate required for the installation area
Outputs	4-20 mA and pulse output	Assign outputs to mass flow, density, temperature or volume
Communication	Modbus RS-485 and HART	Confirm compatibility with the host control system

Materials and Mechanical Reliability

Stainless steel 316L is the standard wetted material for many S-Series configurations. It offers a useful combination of strength, corrosion resistance, cleanability and availability. For more aggressive media, Hastelloy or titanium wetted components may be considered, subject to the chemical compatibility review and model availability.

Material selection should not be based solely on the name of the fluid. Concentration, temperature, pressure, impurities, dissolved gases, flow velocity and cleaning chemicals can all affect corrosion. A suitable application review should consider the complete wetted path, including tubes, flanges, gaskets, seals and any optional liners or fittings.

The meter body and housing are available in robust stainless steel configurations, including 304 and 316L options for the body or external construction. A field housing can protect the transmitter electronics from dust, moisture and normal industrial exposure. The IP67 protection level helps protect against temporary immersion and dust ingress under defined test conditions, but cable glands, covers and installation practices must also be correctly maintained.

For hazardous areas, explosion-proof configurations are available. Ex d, ATEX, PCEC and other approvals are subject to the selected model, transmitter, installation method and destination market. Certification should always be verified before ordering because a general product family statement does not replace the certificate for the exact meter configuration.

Electronics, Outputs and Communication

The transmitter is designed to make the measurement useful in both local and plant-wide control systems. A 4-20 mA output can be assigned to mass flow, density, temperature or calculated volume flow. Pulse output supports totalizing, batch control and external counters. These outputs can be used independently or combined according to the process requirements.

Modbus communication through RS-485 allows the instrument to exchange measurement values, configuration information, status data and diagnostic information with a programmable logic controller, remote terminal unit, distributed control system or supervisory platform. HART communication provides another channel for configuration and integration in systems that use smart field instruments.

Communication capability is particularly important when the meter is installed in a large facility. Operators can monitor several variables without installing separate local indicators. Maintenance personnel can review diagnostic information, confirm configuration settings and identify abnormal operating conditions before they develop into process interruptions.

Power supply options include 26 V DC, 220 V AC and wide-range supplies from approximately 22 to 245 V, depending on the transmitter version. The selected supply should be matched to the plant electrical system, hazardous-area requirements and control cabinet design.

Competitive Advantages in Real Applications

Compared with Magnetic Flowmeters

Magnetic flowmeters are widely used for conductive liquids and can provide excellent performance in water, wastewater and chemical services. However, they do not normally measure nonconductive hydrocarbons, many gases or liquefied gases. They also measure volumetric flow rather than direct mass flow.

The S-Series can measure a broader range of fluid types, including gases, liquefied gases and many nonconductive liquids. It also provides density and temperature information. For processes where the material balance is based on mass or where fluid density changes significantly, this can be a major advantage.

Compared with Turbine Flowmeters

Turbine meters use a rotating element and are sensitive to wear, lubrication, viscosity, flow disturbances and contamination. They can provide good accuracy in clean, stable fluids, but moving parts introduce maintenance considerations. They also normally measure volume and may require additional compensation to determine mass.

The straight-tube Coriolis design has no internal turbine rotor or impeller. It directly measures mass flow and can support density measurement. This may improve long-term stability in applications involving changing viscosity, product composition or operating conditions. The Coriolis meter is generally more expensive than a basic turbine meter, but the additional measurement capabilities and reduced dependence on moving parts can justify the investment in demanding services.

Compared with Vortex Flowmeters

Vortex meters are useful for clean liquids, gases and steam, but they depend on suitable velocity conditions and may require straight pipe lengths to develop a stable flow profile. Performance can also be affected by low flow, vibration and two-phase flow.

The S-Series has a reduced straight-run requirement and provides direct mass measurement. It can be a better solution when the installation is compact or when density information is needed. Vortex meters may remain more economical for utility steam or general gas measurement, so the final selection should reflect the required accuracy, process conditions and total ownership cost.

Compared with Thermal Mass Flowmeters

Thermal mass flowmeters are often selected for clean gases, compressed air and low-flow applications. They are generally compact and can provide direct mass flow for a defined gas composition. However, changes in gas composition, pressure, contamination or moisture can affect their calibration and performance.

A Coriolis meter can measure both liquids and gases and provides density as part of the measurement process. It is suitable for higher-pressure gas and liquefied-gas applications when the selected model is appropriately rated. For very small gas flows or simple compressed-air monitoring, a thermal meter may still offer a more economical solution, but for multipurpose plant measurement the S-Series provides broader flexibility.

Compared with Positive Displacement Meters

Positive displacement meters can be highly accurate for clean, lubricating liquids and are often used in commercial measurement. Their moving chambers or gears may require filtration, maintenance and periodic inspection. Pressure loss can also increase with viscosity and flow rate.

The straight-tube Coriolis meter measures mass without mechanical displacement chambers. It can handle a wider range of fluid properties and also reports density and temperature. This provides additional process information that a conventional positive displacement meter may not offer without auxiliary instrumentation.

Manufacturing and Engineering Strengths

A high-performance flowmeter depends on more than its published measuring principle. Tube geometry, welding, sensor alignment, electronics, calibration, pressure testing, material traceability and final inspection all influence field performance. The manufacturer’s production system is therefore a key part of the product value.

Jiangsu VNER Electronic Technology Co., Ltd. operates as a specialized industrial flowmeter manufacturer in Yangzhou, China. Since 2011, the company has developed products for liquid, gas and slurry measurement, including electromagnetic, Coriolis, vortex, swirl, turbine, thermal mass, ultrasonic and metal tube rotameter technologies. This broad product experience supports technology selection because engineers can compare different measurement principles instead of forcing every application into one product type.

The company operates approximately 23,000 square meters of facilities across three plants and has a technical team of more than 150 people. Its reported project experience includes more than 2,000 engineering projects in over 30 countries. Such project exposure is important for Coriolis applications because meter sizing must account for pressure, temperature, density, viscosity, gas entrainment, installation, hazardous-area classification and required output functions.

Engineering-Led Product Selection

Correct sizing is one of the most important factors in Coriolis meter performance. A meter that is too small may create unnecessary pressure loss or operate near its upper velocity limit. A meter that is too large may operate at a low signal level and reduce measurement stability at the normal flow rate. Engineering-driven selection helps balance normal, minimum and maximum flow conditions.

Application engineers can review the medium, density, viscosity, solids content, vapor pressure, operating temperature, pressure, flow range, pipe size and connection type. They can also determine whether the application requires hygienic construction, high-pressure design, low-temperature materials, explosion protection, bidirectional measurement, batch functions or concentration calculations.

Controlled Tube and Sensor Assembly

The measurement tubes are the central mechanical components of a Coriolis meter. Their geometry and stiffness determine the vibration characteristics, pressure capability and measurement response. Controlled forming, welding and assembly processes are needed to maintain consistent tube dimensions and alignment.

Sensor and drive components must be positioned accurately in relation to the tubes. Small variations in sensor spacing, tube alignment or mechanical stress can affect the signal response. A controlled manufacturing environment, documented assembly procedures and inspection at critical stages help reduce variation from one meter to another.

Welding, Pressure Testing and Material Control

Wetted components must withstand the combined effects of pressure, temperature, vibration and corrosion. Welding quality is therefore essential. Appropriate welding procedures, inspection methods and pressure testing help verify the integrity of the flow path.

Material identification and traceability are also important in chemical, pharmaceutical, food and energy projects. Stainless steel grades, special alloys, gaskets and pressure-containing components should be matched to the approved design. Traceability records can support project documentation, maintenance planning and quality audits.

Calibration and Verification

In-house calibration is one of the manufacturer’s stated capabilities. Calibration allows the meter output to be compared with a controlled reference over a defined operating range. The process helps confirm mass flow performance, repeatability and transmitter configuration before shipment.

Calibration is not merely a final paperwork exercise. It provides feedback about production consistency and can identify mechanical or electronic deviations before the product reaches the customer. For commercial or regulated applications, the required calibration method, uncertainty, certificate format and local legal metrology requirements should be confirmed in advance.

Automated Manufacturing and Quality Processes

Increasing automation can improve production repeatability by reducing manual variation in assembly, inspection and testing. Automation is most effective when combined with documented process controls, trained personnel and measurement-system verification. The goal is not simply faster production; it is consistent product quality, reliable traceability and repeatable performance.

Certified quality processes support a systematic approach to design, purchasing, assembly, testing and after-sales service. For international projects, certification and inspection documents may be required by the end user, EPC contractor, insurer or local authority. The exact documents available depend on the project and product configuration.

Application Guidance for Liquids

For liquid measurement, the sensor should normally remain completely full. Gas pockets can cause unstable readings, particularly when the gas content changes rapidly or the liquid is close to its vapor pressure. The meter should be installed in a location that supports full-pipe operation, such as a rising line, a low point with suitable backpressure or a vertical section with the recommended flow direction.

High-viscosity liquids can be measured, but the expected pressure loss and start-up conditions should be reviewed. Viscosity may change significantly with temperature, so the process temperature range should be included in the sizing analysis. Heating, insulation or heat tracing may be necessary for products such as syrups, oils, polymers and concentrates.

Suspensions and products containing solids should be evaluated for settling, abrasion and blockage. The straight flow path can be beneficial, but the meter is not a substitute for proper solids management. Particle size, concentration, velocity and cleaning procedures should be considered before final selection.

Application Guidance for Gases and Liquefied Gases

Coriolis meters can measure gases directly by mass, which is useful when gas composition, pressure or temperature varies. The gas must remain within the pressure, temperature and flow limits of the selected model. Gas service may require special attention to meter size because gas density is much lower than liquid density, and the corresponding volumetric flow velocity can be high.

For liquefied gases, the system must be designed to prevent unwanted flashing or two-phase conditions. Sufficient pressure should be maintained above the fluid vapor pressure, and valves should be arranged to avoid sudden pressure drops at the meter outlet. Liquefied gas applications may include LPG, refrigerants, cryogenic fluids and other pressurized products, but each requires a detailed review of temperature, pressure, material compatibility and safety classification.

Gas-liquid mixtures can sometimes be measured within Coriolis application limits, but performance depends heavily on phase distribution, bubble size, gas fraction and flow regime. A meter should not be selected for unstable multiphase conditions solely because it can detect some two-phase flow. Testing or application consultation may be required where gas entrainment is unavoidable.

Industry Applications

Oil and Gas

In oil and gas facilities, the S-Series can support measurement of crude products, refined products, condensate, additives, LPG and other process streams. Direct mass measurement is useful for loading, unloading, blending and inventory management. Density data can help identify product changes and verify blend consistency.

For commercial or custody-related service, the complete metering system must comply with the applicable legal and contractual requirements. This may involve approved flow computers, proving systems, temperature and pressure compensation, sealing arrangements and periodic verification. The meter’s suitability should be confirmed as part of the complete system design.

Chemical and Fine Chemical Processing

Chemical manufacturers often dose acids, alkalis, solvents, additives, polymer feedstocks and specialty ingredients. Mass flow measurement helps maintain recipe accuracy when density changes with temperature or concentration. Simultaneous density measurement can provide an additional indication of product composition.

The available Hastelloy or titanium options may support more corrosive services, subject to a formal material compatibility review. High-pressure and explosion-proof configurations can be considered for hazardous process areas and pressurized chemical transfer systems.

Food and Beverage

Food and beverage processes frequently involve syrups, glucose, dairy products, edible oils, alcohols and concentrates. Accurate mass data supports batching, transfer, filling and yield calculations. The low-shear, straight-tube arrangement and hygienic connection options can be advantageous where cleanability and product handling are important.

For sanitary service, the user should specify the required connection, surface finish, cleaning chemicals, sterilization cycle and documentation. The meter should be integrated into a hygienic piping design that avoids stagnant zones and supports complete drainage.

Pharmaceutical and Biotechnology

Pharmaceutical processes require repeatable dosing, traceable records and careful control of contamination risks. The S-Series can measure solvents, intermediates and other process liquids in transfer, filtration and filling systems. Density and temperature data can support batch verification and process monitoring.

Materials, surface finish, connection design, cleaning validation and documentation must be selected according to the applicable pharmaceutical standard and process classification. A meter suitable for general industrial service may not automatically meet the requirements of a validated sterile process.

Water and Wastewater Treatment

Water treatment systems use coagulants, flocculants, neutralizers, disinfectants and conditioning chemicals. Accurate mass dosing can improve treatment efficiency and reduce chemical consumption. The meter can also support consumption tracking and automated dosing control.

In ultrapure water and electronics-related facilities, accurate chemical management is particularly important. The proper wetted material, connection and cleanliness level should be defined for the application, especially when chemicals are concentrated or highly corrosive.

Energy and New Energy

Biofuels, ethanol, biodiesel, thermal oils and emerging energy fluids may have changing density and viscosity. A mass flowmeter with density measurement can support blending, transfer and production control. The low pressure loss of the straight-tube construction is helpful where pumping energy must be minimized.

Battery-material production and other new-energy processes can involve solvents, slurries and specialty chemicals. Each medium requires a separate materials and application review, but the combination of mass flow, density and temperature measurement can provide valuable process data.

KSMF S-Series Coriolis Mass Flowmeter

Installation and Commissioning Recommendations

Although the S-Series does not normally require long upstream or downstream straight pipe runs, installation quality remains essential. The meter should be mounted according to the selected model instructions and supported independently where pipe stress or vibration could be transmitted to the sensor.

For liquid service, select a location that remains full during normal operation. Avoid placing the meter immediately downstream of a point where air can enter the line. If a pump is used, consider whether the meter should be installed on the suction or discharge side. The final arrangement should prevent cavitation, flashing and excessive vibration.

For gas service, confirm that the line size and operating pressure provide an acceptable gas velocity. Avoid abrupt pressure changes near the meter and use suitable isolation and safety valves. In hazardous areas, cable glands, grounding, bonding and enclosure installation must comply with the relevant certificate and local regulations.

Before commissioning, verify the flow direction, process connections, power supply, output assignment, communication settings and engineering units. Confirm that the zero-flow condition is stable before performing a zero adjustment. A zero procedure should be carried out only when the meter is properly installed, filled as required and completely isolated from flow.

Commissioning should include a comparison between the meter indication and an independent process reference where available. Check the measured density and temperature against expected values. Review alarms and diagnostic status, and record the final configuration for future maintenance.

Maintenance and Lifecycle Value

The S-Series has no internal turbine rotor or positive-displacement gear set, which can reduce mechanical wear compared with meters that depend on moving elements. Nevertheless, routine inspection remains important. Operators should monitor zero stability, process noise, density behavior, output signals, housing condition and connection integrity.

Unexpected changes in density may indicate a change in product composition, entrained gas, temperature variation, contamination or an instrumentation issue. A sudden change in mass flow without a corresponding process change may indicate a valve, pump or piping problem. Digital communication and diagnostic data can help maintenance teams distinguish process conditions from meter conditions.

Periodic verification should be based on the criticality of the application, company procedures and applicable regulations. Commercial measurement, pharmaceutical batching and high-value chemical dosing may require more frequent verification than a general utility application. Calibration intervals should consider process severity, historical stability and the consequences of measurement error.

Lifecycle value includes more than the purchase price. Low pressure loss can reduce energy consumption, direct mass measurement can reduce the need for compensation instruments, and density measurement can eliminate a separate density device in some applications. Easy integration with control systems can also reduce commissioning time and simplify plant data management.

Advanced Measurement Functions

Depending on the transmitter platform, optional functions may include concentration calculation, composition estimation, viscosity-related calculations, bidirectional measurement and batch measurement. These features can turn the meter from a basic flow instrument into a process analysis and control device.

Concentration calculations are useful when density has a stable and validated relationship with product concentration. Examples may include selected chemical solutions, sugar products, alcohol mixtures and other formulated liquids. The calculation should be validated against laboratory data before being used as a quality release measurement.

Bidirectional measurement can support transfer systems where material may move in either direction. Batch functions can provide start, stop, preset quantity and totalizing capabilities. These functions should be configured with appropriate shutoff valves and control logic to minimize overrun at the end of a batch.

How to Select the Correct Model

The first selection step is to define the minimum, normal and maximum flow rates. Do not select a meter only from the nominal pipe size. The meter size should be based on its operating range, expected pressure loss, fluid density and required accuracy.

The next step is to define the medium and its properties. Important information includes chemical composition, density, viscosity, solids content, gas content, vapor pressure, conductivity, corrosiveness and cleanliness. For changing products, provide the full range rather than a single typical value.

Operating pressure and temperature must be specified at the meter, not merely at the process source. Pressure may fall across valves, filters, heat exchangers and other equipment. Temperature may vary during start-up, normal production, cleaning and shutdown. The selected sensor, gasket, connection and housing must withstand the complete envelope.

Connection and certification requirements should be identified early. Flanged, threaded, Tri-Clamp and fitting-type configurations are available, with DIN, ANSI and JIS standards among the possible connection standards. Hazardous-area classification, ingress protection, sanitary compliance, calibration documentation and regional approvals may affect the final configuration.

Finally, define the required outputs and communications. Decide whether the control system needs mass flow, volume flow, density, temperature, totalized mass or batch status. Specify 4-20 mA channels, pulse output, HART, Modbus RS-485 or other required interfaces before ordering.

Q&A

What does the S-Series Coriolis meter measure?

It measures mass flow directly and also measures fluid density and process temperature. The transmitter can calculate volume flow from the mass flow and density values.

Can it measure both liquids and gases?

Yes. The product family is intended for liquids, gases and liquefied gases. The exact model must be selected according to density, flow range, pressure, temperature, gas velocity and other application conditions.

Does the meter require upstream and downstream straight pipe?

The straight-tube Coriolis design does not normally require the long straight runs commonly associated with velocity-based flowmeters. However, proper installation, support, full-pipe conditions for liquids and vibration control are still necessary.

What is the main benefit of the straight-tube design?

The design provides a relatively open flow path with low pressure loss and low shear. It also supports cleanability and compact installation, making it suitable for process skids, hygienic systems and applications where pumping energy is important.

Can the meter handle viscous liquids?

It can measure many viscous liquids, including syrups, concentrates, oils and selected polymer-related fluids. The user should provide viscosity and temperature data so that pressure loss, start-up behavior and meter sizing can be evaluated correctly.

Can it measure suspensions or gas-liquid mixtures?

Selected suspensions and gas-liquid mixtures may be measured within Coriolis application limits. Performance depends on solids concentration, particle characteristics, gas fraction, phase distribution and flow stability. Unstable multiphase flow should be reviewed with an application engineer.

What materials are available for corrosive media?

Stainless steel 316L is a standard wetted material, while Hastelloy and titanium options may be available for more demanding services. Material compatibility must be checked against the actual concentration, temperature, pressure and cleaning conditions.

Is the meter suitable for hygienic applications?

It can be configured with hygienic connections such as Tri-Clamp style fittings for suitable food, beverage, pharmaceutical and biotechnology applications. Hygienic compliance depends on the complete configuration, including surface finish, seals, cleaning procedure and installation design.

What outputs are available?

Typical outputs include 4-20 mA and pulse output. Modbus RS-485 and HART communication are also available on applicable transmitter configurations. Output assignment can be used for mass flow, density, temperature, volume flow or totalized values.

Is an explosion-proof version available?

Explosion-proof configurations are available for selected models. The required certificate and protection method must be confirmed for the exact installation area, transmitter, cable entry and destination market.

How accurate is the S-Series?

Available accuracy classes include approximately ±0.1%, ±0.15%, ±0.2% and ±0.5% of rate, depending on the model and application. Repeatability is typically approximately 0.05% to 0.1% of rate. Actual performance should be confirmed from the applicable datasheet.

Does the meter need regular calibration?

Periodic verification or calibration is recommended according to the criticality of the process, company procedures and applicable regulations. Commercial, pharmaceutical and high-value dosing applications may require more formal and frequent verification than general utility service.

How does the meter compare with a turbine flowmeter?

The Coriolis meter measures mass directly and provides density and temperature data, while a turbine meter generally measures volume using a rotating element. The Coriolis meter has a higher initial cost in many cases, but it can offer broader media flexibility, fewer moving parts and more process information.

How should the meter be sized?

Provide minimum, normal and maximum flow, process pressure and temperature, density, viscosity, pipe size, medium composition, connection requirements and output needs. Correct sizing balances accuracy, pressure loss, velocity and turndown across the complete operating range.

Why Choose an Engineering-Oriented Manufacturer

A Coriolis meter is a precision instrument whose performance depends on mechanical design, electronics, calibration and application engineering. A manufacturer with experience across several flow technologies can help determine whether Coriolis measurement is the most appropriate choice or whether another technology would provide better value.

Jiangsu VNER Electronic Technology Co., Ltd. combines product development, manufacturing, calibration and project support. Its facilities, technical team and international project experience provide a foundation for supplying standard and customized industrial instruments. Support for EPC contractors, end users and OEM partners is particularly valuable when multiple meter sizes, connection standards, certificates and output configurations are required within one project.

The company’s product portfolio includes electromagnetic, Coriolis, vortex, swirl, turbine, thermal mass, ultrasonic and rotameter products. This breadth supports practical technology comparison and system-level recommendations. It also reflects an understanding that different media and plant services require different measurement principles.

For the S-Series, the combination of straight-tube construction, direct mass measurement, density sensing, low pressure loss, flexible connections, industrial communications and optional safety configurations creates a strong solution for demanding measurement duties. Manufacturing controls, in-house calibration and engineering-based sizing further support consistent performance from selection through commissioning.

Conclusion

The S-Series straight-tube Coriolis mass flowmeter is designed for industrial users who need accurate mass measurement, density information and dependable process integration in one instrument. Its parallel straight-tube construction offers low pressure loss, low shear, cleanability and installation flexibility. The meter can measure liquids, gases and liquefied gases across a wide range of process conditions, with model options for high pressure, low temperature, high temperature, corrosive media, hygienic service and hazardous areas.

Compared with volumetric technologies, the meter provides direct mass measurement and reduces dependence on separate density compensation. Compared with instruments that contain rotors, gears or other moving elements, it can offer a simpler internal flow path and reduced mechanical wear. Its 4-20 mA, pulse, HART and Modbus capabilities support integration with modern control and data systems.

The product’s value is strengthened by the manufacturer’s engineering and production capabilities. Controlled tube assembly, material management, welding, pressure testing, calibration, certified quality processes and project-based application support are essential to achieving reliable field performance. With appropriate sizing and installation, the S-Series can serve as a high-precision measurement platform for process control, batch operation, product quality monitoring and selected commercial metering applications.

References

1. Coriolis Mass Flow Measurement Principles, industrial instrumentation engineering references.

2. General Requirements for Industrial Process Measurement and Control Equipment.

3. Flow Measurement Engineering: Coriolis, Magnetic, Vortex, Turbine and Thermal Technologies.

4. Industrial Piping Installation and Instrumentation Practice Guidelines.

5. Hygienic Design and Cleanability Principles for Food, Beverage and Pharmaceutical Process Equipment.

6. Hazardous-Area Electrical Equipment and Explosion Protection Application Guidance.

7. Quality Management and Calibration Practices for Industrial Measuring Instruments.

8. KSMF-S Series Straight-Tube Coriolis Mass Flowmeter Product and Application Datasheet.

Product: KSMF S-Series Coriolis Mass Flowmeter