What is a Thermal Flow Switch?
A Thermal Flow Switch is a precision electronic device used to monitor and control the flow of liquids or gases by sensing temperature differences caused by the moving medium. It consists mainly of a sensor probe, an electronic control unit, and a protective housing made of cast aluminum or stainless steel.
When the medium flows, heat transfer occurs between the heated sensor and the fluid. The switch detects this change and outputs an electrical signal, indicating flow or no-flow status.
ZINACA Instruments is a professional thermal flow switch manufacturer, offering various models including Standard, Explosion-proof, Digital, and High-Temperature Explosion-proof Thermal Flow Switches—widely used in industrial automation, fluid monitoring, and process control systems.
Standard Thermal Flow Switch
The Standard Thermal Flow Switch detects gas or liquid flow using the thermal dispersion principle, ensuring reliable and accurate monitoring.
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Explosion Proof Thermal Flow Switch
The Explosion-proof Flow Switch provides safe, reliable flow monitoring in hazardous, flammable, or dusty environments.
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Digital Thermal Flow Switch
The Digital Thermal Flow Switch monitors the flow of liquids and gases in industrial pipelines, featuring a digital display for real-time visualization.
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Explosion-proof Thermal Flow Switch (for High Temperature & High Viscosity Media)
The Explosion-Proof Flow Switch can be widely used for flow detection, alarm, and control in flammable and explosive environments such as petroleum, chemical, power, metallurgy, and other industries.
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Flow and Temperature Integrated Flow Switch
The Flow and Temperature Integrated Flow Switch is a multifunctional thermal flow device that combines precise flow monitoring with real-time temperature measurement.
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Types of Thermal Flow Switch
Standard Thermal Flow Switch:
Designed for general-purpose industrial applications such as water treatment systems, cooling loops, and HVAC control. It offers stable performance, simple installation, and reliable flow detection for most liquid and gas media.
Explosion-Proof Thermal Flow Switch:
Suitable for use in hazardous areas such as oil & gas plants, refineries, and chemical industries. Equipped with an explosion-proof aluminum or stainless steel housing to ensure safe and stable operation under harsh conditions.
Digital Thermal Flow Switch:
Features a digital display and adjustable parameters for real-time monitoring. Ideal for precision flow control in industries like chemical processing, food production, and automation systems.
Explosion-Proof Thermal Flow Switch (for High Temperature & High Viscosity Media):
Specially developed for challenging environments with high temperature or high-viscosity fluids, such as lubricating oil systems, heavy oil transport, and high-viscosity chemical processes. It provides stable and accurate flow detection even under extreme conditions.
Features of Thermal Flow Switch
No moving parts — maintenance-free and long service life
Suitable for both liquid and gas applications
Optional stainless steel or cast aluminum housing
High sensitivity and quick response time
Adjustable setpoint and LED indication for flow status
Output options: Relay, PNP/NPN transistor, or analog signal
Explosion-proof and high-temperature models available
Applications of Thermal Flow Switch
Thermal flow switches are widely used in:
Oil & gas and petrochemical industries
Chemical and pharmaceutical process control
Water and wastewater treatment systems
Air compressor and pneumatic systems
Cooling water and HVAC systems
Food and beverage processing lines
Thermal Flow Switch OEM Service
ZINACA Instruments provides complete OEM and ODM services for thermal flow switches.
We can customize:
Housing: cast aluminum or stainless steel
Sensor probe material: SS316L, SS304, or PTFE (Teflon) for special corrosive media
Output signal and measurement range
Branding, labeling, and packaging
Thermal Flow Switch Manufacturer
Tianjin ZINACA Intelligent Equipment Co., Ltd. is a leading manufacturer specializing in thermal, paddle, and piston flow switches.
With advanced production technology, strict quality control, and ISO/SIL certifications, ZINACA delivers reliable, high-precision, and durable flow instruments for global industrial customers.
If you are looking for a trustworthy thermal flow switch supplier, choose ZINACA Instruments — your reliable partner in industrial automation.
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