Kayden CLASSIC 810 Thermal Flow, Level & Interface Switch

• Ammonia Storage
• Biogas Flow
• Catalysis Vessels
• Chemical Injection & Additive Flow Monitoring
• Chemical Reactors
• Chlor-alkali Processes
• Compressors
• Condensers
• Cooling Water
• Deionization Tanks
• Digester Gas Flow
• Distillation Columns
• Drain Line Flow
• Emergency Eye Wash & Shower Stations
• Fermentation Vessels
• Flare Gas Monitoring
• Flare Knock-out Drums
• Flow Monitoring & Verification
• Heat Exchangers
• Heat Recovery Steam Generator (HRSG) - Power & Utilities
• High Pressure Flows
• Leak Detection
• Lube Oil Systems
• Monitoring Purge Air Flow
• Natural Gas to Boilers
• Oil Well System Testing
• Pumps
• Reboilers
• Refinery Flow Applications
• Relief Valve & Rupture Disk Flow Monitoring
• Remote Indication of Flow via Analog Output & Digital Communications
• Pump Protection - Dry Alarm
• Safety Spray Nozzle Monitoring
• Tank Blanketing
• Tank Overflow Protection
• Tanker Loading & Unloading
• Water & Wastewater
• Vaporizers
• Vent Monitoring

• Biogas Dehydration
• Blending Operations
• Carbon Slurry Level
• Compressor Scrubber
• Compressor Waste Liquid
• Condensate Receiver Tanks
• Cooling Tower Basins
• Crude Desalting
• Crude Dehydration
• Deionization Tanks
• Digester Blow Tanks
• Free Water Knock-out Tanks - High, Low and Interface Level
• Geothermal - Degasser Tanks
• Geothermal - Steam & Brine Separators
• Leak Detection (Accumulation Reservoir)
• Lime Slurry Level
• Mixing & Blending Systems
• Oil Separators & Treaters - High, Low & Interface Level
• Production Fluid Storage
• Pulp Bleaching Towers
• Pulp Digesters
• Pulp Storage
• Pulp Washing Systems
• Sampler Systems
• Sand Separators
• Scrubber Vessels
• Storage Tanks
• Sumps - All Types of fluids: Water, Oil, etc.
• Surge Tanks
• Tank Overflow
• Turpentine Recovery
• Vapor & Liquid Separation
• Vapor Recovery

• Crude Desalting
• Interface Control in Separation Vessels
• Interface Detection
• Interface Control & Level Detection in Settling Vessels
• Liquid-Liquid Extraction - LLX

• Liquids, Air & Gases
• Slurries
• Corrosive Liquids

• Flameproof, Hazardous & General-Purpose Areas

• Consistent Process Composition & Temperature
• Sufficient Straight Run Flow Profile (minimizes turbulence)
• Recommended Minimum of 5 Pipe Diameters from any Disturbance

Air & Gas

RELIABILE & COST-EFFECTIVE 
Thermal dispersion flow, level, and interface switches provide tangible operational, economic, and safety advantages. These instruments are highly durable, require minimal maintenance, and integrate seamlessly and adapt easily, making industrial processes more reliable, efficient, and compliant.

Thermal dispersion, or calorimetric, flow, level, and interface switches offer a multitude of advantages that contribute to improved process reliability, safety, and cost-effectiveness in industrial settings. These benefits span operational performance, lifecycle economics, and integration flexibility.

HIGH RELIABILITY & LONG-TERM STABILITY
Robust sensor elements and protective housings are highly durable in harsh conditions, allowing them to withstand corrosive fluids, extreme temperatures, high pressures, and abrasive or viscous media.

The fundamental thermal measurement principle is stable over time, ensuring stable, repeatable performance over years of operation.

BROAD APPLICABILITY & VERSATILE SENSING CAPABILITY
A single thermal dispersion instrument can often serve multiple functions—detecting flow/no-flow conditions, monitoring liquid levels, and identifying interface boundaries in multi-layer fluid systems, as its operating principle and technology are inherently versatile. The same fundamental principle applies to gases, liquids, and slurries, accommodating a wide range of process fluids, including water, oils, chemicals, solvents, and slurries.

Thermal dispersion switches can accurately detect very low flow rates and respond reliably in varying fluid densities, viscosities, and temperatures.

COST-EFFECTIVE OWNERSHIP & LOW MAINTENANCE
With no moving parts to recalibrate, repair, or replace, scheduled maintenance requirements and associated labor costs are drastically reduced, keeping maintenance demands to an extreme minimum.

The inherent ruggedness and simplicity of the design lead to an extended service life, with longer intervals between service and fewer unscheduled shutdowns, lowering the total cost of ownership. Kayden thermal dispersion devices require no periodic recalibration and hold their calibration well, further reducing maintenance costs.

SAFETY & REGULATORY COMPLIANCE
Kayden's models, standard with fail-safe operation, can be configured to go into safe states under defined fault conditions, supporting plant safety initiatives and regulatory compliance. All models are available with explosion-proof certifications, enabling use in flammable or otherwise hazardous environments while meeting regulatory standards.

EASY INTEGRATION & REDUCED PROCESS IMPACT
Thermal dispersion switches are insertion-type instruments that can be installed through a simple nozzle or port, which reduces the need for piping modifications and associated costs. Because the sensor elements are small and streamlined, their presence in the flow path introduces negligible pressure loss, helping maintain efficiency in fluid transport.

Available in various geometries and installation options, these switches readily fit existing systems and can be located in difficult-to-access or space-restricted areas.

ENHANCED PROCESS CONTROL & OPTIMIZATION
The continuous, real-time monitoring of a steady, non-interrupted data stream enables an immediate response to changing conditions, improving process control and product quality. Reliable flow/no-flow and level detection help identify early detection of anomalies and problems such as pump failures, line blockages, leaks, or interface layer shifts before they escalate.

THERMAL FLOW, LEVEL & INTERFACE SWITCHES
Kayden's thermal dispersion flow, level, and interface switches and transmitters offer many distinct advantages that make them highly valuable for monitoring and controlling the flow or level of liquids, gases, and slurries in various industrial applications, making them highly effective and dependable for critical applications in industries such as chemical processing, oil and gas, water and wastewater management, and pharmaceuticals, where precise monitoring of flow or level is essential for operational safety and efficiency.

NO MOVING PARTS
Thermal dispersion devices rely on temperature differential rather than mechanical motion, eliminating wear-prone components such as paddles, floats, or turbines. This inherently reduces the likelihood of mechanical failure.

Thermal dispersion switches do not have any moving parts, which significantly reduces the potential for mechanical wear and tear. This absence of moving parts leads to increased durability and reliability, minimizing maintenance requirements and prolonging the lifespan of the device while providing simpler design and operation, reducing the risk of operational failures, and simplifying maintenance procedures. Choose thermal dispersion switches for their high reliability and simplicity.

VIRTUALLY NO PRESSURE LOSS
The design of thermal dispersion flow sensors ensures that they introduce very little resistance to the flow. This characteristic is crucial in applications where maintaining the existing pressure level is essential.

Thermal dispersion flow sensors, which have no moving parts and provide minimal intrusion into the flow, ensure that they do not significantly disrupt the fluid's path or create turbulence, thereby causing minimal obstruction to the flow of the medium and reducing the potential for pressure drops. By minimizing pressure loss, these sensors help maintain energy efficiency in the system, reducing the need for additional energy to compensate for pressure drops. This feature makes them ideal for use in systems where pressure stability is crucial, such as in certain chemical processing or HVAC applications.

Kayden's Classic 800 Series of thermal dispersion flow switches and transmitters are especially beneficial in applications where it is important to keep the system's original pressure. Their design reduces pressure drop, ensures high accuracy and reliability, and offers a versatile solution for a wide range of industrial applications. These benefits make them an excellent choice when pressure loss is a critical consideration.

EXAMPLE APPLICATIONS

Chemical Processing
Accurate flow measurement without pressure drop helps in precise mixing and reaction control.

Water and Wastewater Treatment
Ensures efficient flow measurement without adding to the system’s pressure load.

HIGH ACCURACY AND SENSITIVITY
Thermal dispersion switches are known for their high accuracy in measuring flow or detecting fluid levels. They can detect low flows and small changes in the flow rate or level, making them suitable for applications requiring precise control and providing consistent and repeatable measurements, which is critical for maintaining the efficiency and quality of industrial processes.

Kayden thermal flow sensors measure the flow based on the cooling effect of the fluid or gas on a heated sensor, providing accurate and direct flow rate measurements without significantly affecting the fluid dynamics.

WIDE RANGE OF MEDIA COMPATIBILITIES
Thermal dispersion switches can be used with a wide range of fluids, including corrosive and dirty media, further broadening their range of suitable applications. They are effective in both liquid and gas applications, which makes them versatile tools for diverse industrial environments.

Thermal dispersion switches can be customized with various materials and coatings to handle different types of fluids and operating conditions, enhancing their utility in specialized applications.

EASY INSTALLATION AND INTEGRATION
These switches are fairly compact and simple to install. They can be mounted in various orientations and configurations to suit different system designs. Kayden's thermal dispersion flow sensors are designed for simple insertion into the flow stream, allowing for straightforward installation without major modifications to the system. They can easily be integrated into most process control systems, offering outputs that are compatible with digital control systems, which facilitates monitoring and automation.

LOW MAINTENANCE & COST-EFFECTIVE
The minimal maintenance requirements reduce ongoing operational expenses. Since they are durable and very reliable, Kayden's thermal dispersion switches and transmitters decrease the need for frequent replacements or extensive and expensive system downtime for repairs. The no-moving parts' construction results in low maintenance requirements and reduced operational downtime. Their robust design means fewer failures, which enhances the safety of the operations, especially in critical processes involving hazardous materials.

OPERATIONAL IN CHALLENGING CONDITIONS
Thermal dispersion technology performs well in extreme environments, including high temperatures and high pressure, as well as in hazardous areas where explosive gases or liquids are present.

Insensitive to Pressure and Temperature Changes
Unlike some other flow or level sensing technologies, thermal dispersion switches are less sensitive to variations in pressure and temperature, which can affect the accuracy and reliability of flow measurements in other sensor types.

NO CALIBRATION REQUIRED
Once installed and configured, thermal dispersion switches generally do not require recalibration. They maintain their accuracy over time, offering stable and precise readings, which is essential for maintaining process control without introducing pressure variability.