Brand:‌ Shanghai Zanke Automation Co., Ltd.

Model:‌ NK55

Product Description‌

The NK55 flow switch is a device that triggers system actions based on fluid flow rates. By setting upper or lower flow thresholds, the switch sends signals or alarms when the flow reaches the preset limit, enabling system activation or shutdown. It is commonly used in flow-dependent systems.

Integrated Flow & Temperature Sensor (NK210 Standard Series)‌

Operating Principle‌

Utilizing thermal dispersion technology, the sealed probe contains two resistors: one heated (sensing resistor) and one unheated (reference resistor). Fluid flow cools the heated resistor, altering its resistance. The difference between the two resistors determines the flow velocity.

Key Features‌

No moving parts‌: Maintenance-free with easy installation.

Universal compatibility‌: Single model suits multiple pipe diameters.

Adjustable thresholds‌: Switch points can be calibrated.

Low pressure loss‌: Compact design with minimal flow disruption.

OLED display‌: Real-time flow trend and switch status visualization.

Integrated temperature measurement‌: Supports temperature alarms and remote monitoring.

Applications‌

Pneumatic/hydraulic systems.

Flow monitoring for cooling water, cutting fluid, and lubricants.

Pump dry-run protection.

Technical Parameters‌

Parameter Specification

Flow Range‌ Water: 1–200 cm/s; Oil: 3–300 cm/s; Air: 20–2000 cm/s (factory/field calibration required)

Compatible Media‌ Liquids/gases compatible with stainless steel (e.g., water, oil, air)

Repeatability‌ ±1% (<0.6 m/s); ±3% (<1.5 m/s); ±10% (>1.5 m/s)

Output Options‌ PNP/NPN/relay; NO/NC configurable

Load Capacity‌ 500 mA (24V DC for PNP/NPN); 60W (relay)

Display‌ 0.96-inch OLED with digital flow indication

Setting Method‌ Keypad adjustment

Pressure Rating‌ 100 bar (300 bar optional)

Response Time‌ 1–13 s (typ. 2 s); Initialization: ~8 s

Power Supply‌ 24V DC ±20%

Electrical Protection‌ Reverse polarity, short-circuit, overload protection

IP Rating‌ IP67

Temperature Range‌ Media: -20°C to 85°C; Ambient: -40°C to 85°C; Storage: -20°C to 100°C

Connection‌ M12 connector or 2-meter cable (default)

Material‌ Probe/housing: 304 stainless steel

Weight‌ 0.4 kg

Accessories & Notes‌

Default electrical accessory: NK05PU02FG (5-core straight cable, 2m).

Custom configurations (e.g., flanged versions) require special ordering.