Product Overview

The NOIKE-AH Flange Explosion-Proof Thermal Flow Switch is a high-performance thermal dispersion flow sensor designed for reliable flow monitoring of liquids, oils, and gases in hazardous industrial environments. With no moving mechanical parts, it delivers maintenance-free operation, excellent repeatability, and long-term stability.

Manufactured with a rugged cast aluminum explosion-proof housing and a 304 stainless steel sensing probe, the flow switch withstands harsh operating conditions while providing accurate flow detection for process control, pump protection, and equipment safety.

Its flange-mounted design makes it ideal for larger pipelines and industrial process systems where reliable flow monitoring is essential.

Working Principle

The flow switch operates using the thermal dispersion (heat transfer) principle.

The sensing probe contains two precision temperature sensors:

• Reference Sensor – Continuously measures the actual temperature of the process medium.
• Heated Sensor – Maintains a constant temperature above the medium.

When there is no flow, the heated sensor maintains a fixed temperature difference relative to the reference sensor. As the medium begins to flow, heat is transferred away from the heated sensor. The faster the flow velocity, the greater the heat dissipation and the smaller the temperature difference.

The electronic circuit continuously monitors this temperature difference and converts it into a switching signal or flow indication. This non-mechanical measuring principle ensures high reliability, rapid response, and maintenance-free performance.

Product Features

• Thermal dispersion technology with no moving parts
• Flange-mounted design for industrial pipelines
• Suitable for liquids, oils, and gases
• High reliability with maintenance-free operation
• Rugged explosion-proof aluminum housing
• 304 stainless steel wetted parts
• Real-time flow indication with 6-LED display
• Adjustable switching point via potentiometer
• Reverse polarity, overload, and short-circuit protection
• Excellent long-term stability and repeatability
• High pressure resistance up to 100 bar
• IP67 protection for harsh industrial environments

Technical Specifications

Typical Applications

The Flange Explosion-Proof Thermal Flow Switch is suitable for continuous flow monitoring in hazardous and demanding industrial environments, including:

Oil & Gas

• Pipeline flow monitoring
• Pump dry-run protection
• Lubrication systems
• Cooling circuits

Petrochemical Industry

• Chemical process monitoring
• Corrosive media detection
• Hazardous-area flow control

Power Generation

• Cooling water systems
• Boiler circulation
• Heat exchanger protection

Water & Wastewater Treatment

• Pump protection
• Filtration systems
• Chemical dosing equipment

Steel & Metallurgy

• Cooling water monitoring
• Hydraulic systems
• Lubrication circuits

Food & Beverage

• Process water monitoring
• Cooling systems
• CIP cleaning processes

General Industrial Automation

• Hydraulic equipment
• Pneumatic systems
• Machine tool cooling
• Process automation
• Flow alarm systems

Advantages

Compared with conventional mechanical flow switches, the thermal dispersion design offers:

• No moving parts for maintenance-free operation
• High reliability and long service life
• Accurate flow detection for liquids and gases
• Minimal pressure loss
• Stable performance under varying process conditions
• Easy installation and adjustment
• Excellent resistance to vibration and contamination
• Suitable for hazardous industrial environments

Why Choose the NOIKE-AH Flange Explosion-Proof Thermal Flow Switch?

The NOIKE-AH Flange Explosion-Proof Thermal Flow Switch combines advanced thermal dispersion technology with robust industrial construction to deliver accurate and reliable flow monitoring. Its explosion-proof certification, maintenance-free operation, and wide application compatibility make it an ideal solution for protecting pumps, monitoring process flow, and improving system safety in oil & gas, chemical processing, power generation, water treatment, and other demanding industries.

 Wiring