The Shaanxi Sier SPK81 is an intelligent thermal diffusion flow switch designed for industrial water monitoring. It utilizes an ARM-based processor and high-quality sensors with temperature compensation, ensuring accurate flow detection even with varying water temperatures. The device is ideal for cooling circuits, lubrication systems, and general industrial water flow monitoring, providing critical pre-warning and protection against flow faults.

Key Features

• Wide Power Range: Operates on either 24 VDC or 220 VAC, offering flexibility for various industrial control systems.
• Clear Visual Indication: The self-luminous OLED screen provides a clear interface, switchable between a progress bar and digital display, for easy status monitoring and setpoint adjustment.
• Flexible Output Configuration: Configurable outputs include a single relay, dual PNP, or dual NPN. A custom version with 2x PNP + 4-20 mA analog output is also available.
• Rugged & Maintenance-Free: The all-stainless steel housing is rated IP67, making it resistant to water, dust, and corrosion. With no moving parts, it is virtually maintenance-free.
• Easy Installation & Setup: The quick-set point adjustment and display inversion feature allow for flexible installation in any orientation without frequent recalibration.
• Built-in Protection: Integrated over-voltage, over-current, and reverse polarity protection enhance the device's reliability and lifespan in demanding industrial environments.

Technical Specifications

• Measurement Range: 1 to 150 cm/s (water)
• Accuracy: Typically ±5% of measured value (requires field calibration for critical applications)
• Temperature Compensation: Yes, for accurate measurement across varying water temperatures
• Power Supply: 24 VDC (max. 100mA) / 220 VAC (50/60 Hz)
• Output: Relay (max. 1A @ 24 VDC), PNP (max. 200mA), NPN (max. 200mA), custom analog 4-20mA
• Electrical Connection: M12 x 1, 5-pin connector (standard)
• Process Connection: Mounting joint adaptable to various pipe diameters (custom threads available)
• Housing Material: Stainless steel
• Protection Class: IP67
• Dimensions (approx.): Compact design, please consult manufacturer for exact dimensions.

Applications

The SPK81 is suitable for a wide range of industrial applications, including:

• Cooling water monitoring for welding machines, lasers, and industrial ovens
• Lubricating oil flow verification in gearboxes and compressors
• Pump dry-run protection
• Leak detection in water pipelines
• Filter blockage monitoring
• General process control in power generation, metallurgy, papermaking, and boiler systems