The Thermal Flow Sensor TFS-35 is a precision industrial instrument developed for continuous monitoring and limit detection of liquid flow velocity and temperature inside pipelines. Designed for modern automation environments, this compact sensor uses thermal flow measurement technology to detect changes in flow conditions without moving mechanical components. This design significantly improves reliability, reduces maintenance, and ensures consistent performance in demanding industrial environments.
The TFS-35 is commonly used in manufacturing plants, water treatment facilities, cooling systems, chemical processing units, and machine lubrication circuits where stable fluid flow monitoring is critical for safe and efficient operation.
Key Features
- Thermal flow monitoring for liquids
- Combined flow velocity and temperature monitoring
- LED bar graph indication of flow status
- Configurable switching thresholds
- PNP transistor outputs and optional 4–20 mA output
- Stainless steel industrial housing
- Magnetic pen configuration for easy setup
- Compact sensor for pipe installation
- High pressure resistance for industrial systems
These features allow operators and engineers to maintain reliable process control while minimizing system downtime.
Design & Functionality
The TFS-35 thermal flow sensor operates based on calorimetric measurement principles. The sensor detects the cooling effect produced by flowing liquid across a heated sensing element. As the flow velocity increases or decreases, the temperature difference between the sensing elements changes, enabling accurate detection of flow rate conditions.
The device is installed directly in pipelines and continuously monitors both liquid movement and temperature behavior. A visual LED bar graph display provides a quick indication of flow conditions, while additional LEDs show switching states and temperature monitoring status.
Configuration and calibration are simplified through the use of a magnetic programming pen, allowing safe adjustment without opening the sensor housing.
Total Crossed Beams
The sensor continuously evaluates thermal energy transfer within the liquid stream. By measuring the heat dissipation from the sensing element into the flowing medium, the device accurately determines flow presence and velocity conditions.
This approach eliminates the need for rotating components or mechanical turbines, resulting in improved durability and stable long-term measurement performance.
Beam Pitch Options
The TFS-35 is available with multiple configuration options to suit various industrial installation requirements. Process connections include threaded G½ connections and compatible fittings for integration into existing piping systems.
Different cable and connector options allow flexible installation in automation cabinets, machine assemblies, or process control environments.
Intrinsic Synchronism
The sensor provides synchronized monitoring of both flow velocity and temperature, allowing operators to detect abnormal process conditions early. Integrated electronic protection safeguards the device against voltage polarity reversal, overload, and short-term overvoltage events.
The combination of temperature thresholds and flow detection ensures improved system reliability in cooling loops, lubrication circuits, and process fluid monitoring systems.
Operational Advantages
The Thermal Flow Sensor TFS-35 offers several advantages for industrial flow monitoring applications:
- No moving parts for longer service life
- Reliable detection of low liquid flow rates
- Compact design for easy pipeline installation
- Visual LED diagnostics for quick system checks
- Flexible output configurations for automation systems
- Durable stainless steel construction for harsh environments
These characteristics make the TFS-35 an efficient solution for industrial automation engineers seeking dependable liquid flow monitoring.
