Technical Specifications of Thermal Flow Switch

Working Principle‌

The device operates on a thermal measurement principle. Its sealed probe contains two resistors:

Heated resistor‌: Serves as the sensing element.

Reference resistor‌: Maintains ambient temperature.

When fluid flows, heat dissipation from the heated resistor alters its resistance value. The differential resistance between the two resistors determines the flow velocity.

Key Features‌

• Maintenance-free‌: No moving parts.
• Universal installation‌: Single model accommodates multiple pipe diameters.
• Low pressure loss‌.
• Integrated functions‌:
• Color LCD displays flow trend and switch status.
• Built-in temperature measurement with alarm and remote monitoring capabilities.

Applications‌

Media compatibility‌: Liquids (water, oil), gases, and gas-liquid mixtures.

• Typical uses‌:Low-flow alarms.
• Pneumatic/hydraulic systems.
• Coolant/lubricant flow monitoring.
• Pump dry-run protection.

Technical Parameters‌

Category Specifications

• Flow Range‌ 0.01–2.0 m/s (water)
• Temperature Range‌ 0–100°C (medium) / -20–80°C (ambient/storage)
• Temperature Accuracy‌ ±1.5°C (when probe is immersed)
• Output Signals‌ ‌Temperature‌: PNP/NPN/IO-link, 4–20mA, 1–5V
• ‌Flow‌: PNP/NPN/IO-link, 4–20mA, 1–5V
• Power Supply‌ 24V DC ±20%
• Current‌ Max. 200mA (PNP/NPN), Consumption <100mA
• Display‌ 0.96″ color LCD (flow/temperature)
• Configuration‌ Button-operated settings
• Pressure Rating‌ 100 bar
• Response Time‌ 1–13s (typically 2s)
• Electrical Protection‌ Reverse polarity, short-circuit, overload protection
• IP Rating‌ IP67
• Materials‌ ‌Housing‌: Stainless steel/engineering plastic
• ‌Wetted parts‌: 316L stainless steel/EPDM
• Connector‌ M12 plug

Note‌: Specifications are subject to customization based on application requirements.

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