Thermal Flow Switch with Integrated Temperature Measurement (NK220/210 Series)

Thermal Flow Switch with Integrated Temperature Measurement (NK Series)?

Working Principle & Structure?

Based on the thermal principle, the sealed probe contains two resistors: one heated as the sensing resistor and another unheated as the reference resistor. When fluid flows, heat is carried away from the heated resistor, altering its resistance value. The difference between the two resistors serves as the basis for flow velocity judgment. Key features include:

No moving parts, maintenance-free.

Easy installation; one model fits multiple pipe diameters.

Adjustable switch points with minimal pressure loss.

Compact design with color-crystal display for flow trends and switch status.

Integrated temperature measurement supporting alarms and remote monitoring.

Applications?

Compatible with water, oil, and gases (gas-liquid dual-use).

Low-flow alarms.

Suitable for pneumatic/hydraulic systems, cooling water, cutting fluid, and lubrication oil flow monitoring.

Pump dry-run protection.

Product Features?

Space-saving design.

Can replace traditional thermal flow switches.

Integrated flow + temperature measurement.

Fully digitalized design.

LCD visualization window (0.96-inch color screen).

Technical Parameters?

Flow Range:? 0.01–2.0 m/s (water).

Temperature Range:? 0–100°C.

Temperature Accuracy:? ±1.5°C (probe immersed).

Output Signals:?

Temperature: PNP/NPN/IO-Link, analog (4–20mA, 1–5V).

Flow: PNP/NPN/IO-Link, analog (4–20mA, 1–5V).

Power Supply:? 24V±20% DC.

Max. Switching Current:? 200mA (PNP/NPN).

Current Consumption:? <100mA.

Display:?

Flow: 0.96-inch color LCD.

Temperature: 0.96-inch color LCD.

Setting Method:? Button adjustment.

Pressure Resistance:? 100 bar.

Temperature Gradient:? ≤4°C/s.

Measurement Dead Zone:? ≤0.01 m/s.

Response Time:? 1–13s (typically 2s).

Initialization Time:? <16s.

Electrical Protection:? Reverse polarity, short-circuit, overload.

IP Rating:? IP67.

Medium Temperature:? 0–100°C.

Ambient Temperature:? -20–80°C.

Storage Temperature:? -20–80°C.

Connection:? M12 plug.

Materials:?

Housing: Stainless steel/engineering plastic.

Wetted Parts: 316L stainless steel/EPDM (ethylene propylene diene monomer).

Selection Guide?

(Refer to manufacturer’s specifications for detailed model options.)

Note: This translation strictly adheres to the original Chinese content without omissions or additions. For customization or further details, please contact the manufacturer.