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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Thermal Flow Switch
Standard Thermal Flow Switch
Thermal flow switches are mainly used for installation in pipelines carrying water, gas, oil, or other media. They operate based on the principle of heat transfer between the heated sensor and the medium. By detecting changes in the cooling effect of the medium, the switch can accurately monitor flow conditions. When the flow rate rises above or falls below a preset threshold, the switch outputs an alarm signal to the system, which can then execute protective actions. This helps prevent equipment failures such as pump idling or "dry running," ensuring safe and reliable operation.
Wide flow detection range: 1–150 cm/s (water), 3–300 cm/s (oil), 20–2000 cm/s (air)
Flexible outputs: Relay, PNP, NPN options
Robust design: Pressure resistance up to 10 MPa (standard), 30 MPa (explosion-proof)
High temperature capability: -20…80°C (standard), up to 280°C (explosion-proof)
Fast response: Typical response time ~2s, initialization ~8s
Durable housing: Stainless steel probe; stainless steel / explosion-proof cast aluminum housing
Reliable protection: IP65, with reverse polarity, short-circuit, and overload protection
Description
Overview of Standard Thermal Flow Switch
The Standard Thermal Flow Switch is a reliable and maintenance-free flow monitoring device designed for detecting the flow of gas and liquid media in pipelines. It operates on the thermal dispersion principle, measuring the heat transfer between a heated sensor and the medium to detect flow rate changes accurately. When the flow exceeds or falls below a preset threshold, the switch outputs an alarm signal, enabling the system to take protective actions such as preventing pump idling or dry running.
It is widely used in water cooling systems, oil circulation, pneumatic and hydraulic systems, and other industrial applications where precise and stable flow detection is essential.
Features of Standard Thermal Flow Switch
Wide flow detection range: 1–150 cm/s (water), 3–300 cm/s (oil), 20–2000 cm/s (air)
Flexible output options: Relay, PNP, or NPN
High durability: Stainless steel probe with stainless steel or explosion-proof cast aluminum housing
Strong pressure resistance: Up to 10 MPa (standard), 30 MPa (explosion-proof)
High temperature capability: -20…80 °C (standard), up to 280 °C (explosion-proof)
Fast response time: Typical response ~2 s, initialization ~8 s
Reliable protection: IP65 rated, with reverse polarity, short-circuit, and overload protection
No moving parts: Ensures wear-free, maintenance-free operation
Flexible installation: Available in plug-in and inline versions (threaded or flanged)
Hygienic and corrosion-resistant: Suitable for food-grade and sanitary processes
Applications of Standard Thermal Flow Switch
The Standard Thermal Flow Switch is suitable for air, water, oil, cutting fluid, and lubricants.
Typical application scenarios include:
Water-cooled welding machines
Laser equipment cooling systems
Vacuum coating machines
Electric furnaces
Polysilicon ingot casting furnaces
Industrial applications:
Circulating water, lubricants, and cutting fluid monitoring
Pump idling protection
Flow interruption detection to prevent equipment damage
Price of Standard Thermal Flow Switch
The price of a Standard Thermal Flow Switch varies depending on specific parameters, materials, and configuration requirements.
If you would like to know the latest price of ZINACA’s Standard Thermal Flow Switch, please contact us for a detailed quotation.
Standard Thermal Flow Switch OEM Service
ZINACA Instruments is a professional industrial instrument manufacturer specializing in pressure, temperature, flow, and level measurement devices.
We provide OEM and customization services for Standard Thermal Flow Switches based on your specific requirements and working conditions.
If you are looking for a reliable OEM partner for Standard Thermal Flow Switch products, please feel free to contact ZINACA Instruments.
Standard Thermal Flow Switch Manufacturer
ZINACA Instruments is a trusted Standard Thermal Flow Switch manufacturer with extensive experience in industrial automation instruments. Our products are ISO 9001, CNAS, IAF, SIL, and ACM certified, ensuring high quality, reliability, and durability in harsh environments. They deliver safe and stable performance across oil & gas, chemical, metallurgy, power, and machinery industries.
Technical parameters
| Type | Parameter |
|---|---|
| Plug-in setting range | 1 - 150 cm/s (water), 3 - 300 cm/s (oil), 20 - 2000 cm/s (air) |
| Signal output | Relay, PNP, NPN |
| Electricity supply | 24V ±20% DC |
| Turn on the power | Maximum 400mA (PNP or NPN type) Maximum 1A @ 48Vac/dc (relay type) |
| No-load current | Maximum 80mA |
| Setting method | Potentiometer setting, key setting |
| Pressure resistance range | ≤10MPa (standard type), ≤30MPa (explosion-proof type) |
| Medium temperature change | ≤4℃/s |
| Response time | 1...13s, typical 2s |
| Initialisation time | About 8s |
| Electrical protection | Inverted phase, short circuit, overload protection |
| Protection class | IP65 |
| Medium temperature | -20...80°C (standard), ≤280°C (explosion-proof) |
| Material | Probe: stainless steel; Housing: stainless steel (explosion-proof cast aluminium housing) |
| Measurement accuracy | ±2.5% |
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