The KOBOLD KAL-D is a compact, calorimetric (thermal) flow switch engineered for reliable flow/no-flow detection in water-based liquids (≥90% water content). Its solid-state design features no moving parts, ensuring maintenance-free operation and a long service life in demanding industrial environments. The all 316-Ti stainless steel wetted parts provide excellent corrosion resistance, making it suitable for a wide range of water monitoring applications.

Technology & Features

The KAL-D operates on the principle of thermal dispersion. The sensor tip contains an element heated a few degrees above the medium temperature. As the liquid flows, it dissipates heat; the cooling effect is proportional to the flow velocity. A microprocessor provides temperature compensation, ensuring accurate switching points despite fluctuating process temperatures. The compact design allows for easy installation in space-constrained locations, and the dual LED (green/red) provides clear local indication of flow status.

Key Specifications

• Power Supply: 24 VDC ±10%
• Current Consumption: ≤50 mA
• Output: PNP, N/O or N/C selectable
• Accuracy: ±5% of measured value (including temperature drift)
• Response Time: 1 to 10 seconds (adjustable)
• Max Pressure: 40 bar (580 psig)
• Media Temperature: -4°F to +176°F (-20°C to +80°C)
• CIP Cleaning Temperature: Up to +250°F (+121°C)
• Protection Rating: IP65
• Process Connections: 1/4" NPT, 1/2" NPT, G 1/4, G 1/2, M12 x 1
• Wetted Materials: 316-Ti Stainless Steel
• Electrical Connection: M12 x 1 (4-pin)
• Approvals: CE

Installation Requirements

The KAL-D flow switch is designed for direct insertion into pipelines. It is ideal for pipe diameters from 1/2" to 6". For reliable operation, ensure the sensor tip is fully immersed in the flow stream. The compact housing can be rotated 360° for optimal cable routing. The adjustable setpoint allows field calibration to match specific system requirements.

Applications

The KAL-D is widely used for flow/no-flow detection in process water distribution, cooling circuits, pump dry-run protection, leak detection, boiler protection, heat exchangers, welding equipment, laser cooling systems, and chemical processing.