Explosion Proof thermal flow switches are designed for safe and reliable use in hazardous environments where flammable gases or vapors may be present. Installed directly in pipelines carrying water, gas, oil, or other media, they operate on the principle of thermal heat transfer between the sensor and the medium. By detecting variations in cooling effects, the switch precisely monitors flow conditions. When the flow rate exceeds or falls below a preset threshold, it provides an alarm or control signal to the system. This ensures timely protection against equipment failures such as pump idling or "dry running," while maintaining high safety standards in explosive atmospheres.
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
The Explosion Proof Thermal Flow Switch is a reliable and maintenance-free device designed for safe flow monitoring in hazardous environments where flammable gases, vapors, or dust may be present. Installed directly in pipelines carrying water, gas, oil, or other media, it operates on the thermal heat transfer principle between the sensor and the medium. By detecting changes in cooling effects, the switch accurately monitors flow conditions and provides alarm or control signals when the flow exceeds or falls below preset thresholds. This helps prevent equipment failures such as pump idling or dry running, ensuring safe and reliable operation in explosive atmospheres.
Wide flow detection range: 1–150 cm/s (water), 3–300 cm/s (oil), 20–2000 cm/s (air)
Flexible outputs: Relay, PNP, or NPN options
Robust and explosion-proof 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 ~2 s, initialization ~8 s
Durable housing: Stainless steel probe; stainless steel or explosion-proof cast aluminum housing
Reliable protection: IP65 rated, with reverse polarity, short-circuit, and overload protection
Explosion-proof Ex d housing for hazardous areas
No moving parts: Wear-free, maintenance-free operation
Flexible installation: Plug-in or inline (threaded or flanged)
High adaptability: Suitable for high temperature, high pressure, and corrosive media
Hygienic applications: Compatible with food-grade and sanitary processes
Versatile media: Water, oil, gas, cutting fluids, lubricants
Applicable Media: Air, circulating water, cutting fluid, lubricating oil, and other fluids.
Typical Application Scenarios:
Water-cooled welding machines
Laser equipment cooling systems
Vacuum coating machines
Electric furnaces
Polysilicon ingot casting furnaces
Industrial Uses:
Monitoring of circulating water, lubricants, and cutting fluids in pneumatic and hydraulic systems
Pump idling protection in hazardous areas
Flow cut-off monitoring to prevent equipment damage
The price of an Explosion Proof Thermal Flow Switch varies depending on specific parameters, materials, and configuration requirements.
If you would like to know the latest price of ZINACA Instruments’ Explosion Proof Thermal Flow Switch, please contact us for a detailed quotation.
ZINACA Instruments is a professional industrial instrument manufacturer specializing in flow, pressure, temperature, and level measurement devices.
We provide customized OEM solutions for Explosion Proof Thermal Flow Switches according to your specific requirements and operating conditions.
If you are seeking Explosion Proof Thermal Flow Switch OEM services, please contact ZINACA Instruments.
ZINACA Instruments is a trusted Explosion Proof Thermal Flow Switch manufacturer, certified with ISO 9001, CNAS, IAF, SIL, and ACM, ensuring high-quality and reliable products for industrial applications.
Our switches are designed for safe and stable operation in 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% |
The Standard Thermal Flow Switch detects gas or liquid flow using the thermal dispersion principle, ensuring reliable and accurate monitoring.
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The Explosion-proof Flow Switch provides safe, reliable flow monitoring in hazardous, flammable, or dusty environments.
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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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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.
Read MoreNo. 12, Within Waihuan Industrial Company Compound, Fujin Road, Zhongbei Town, Xiqing District, Tianjin, China
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