The electrical connection head is a critical sub-component of sensors and probes that serves as the termination point for electrical wiring. It houses the terminals, connectors, or pins that establish the electrical pathway between the sensing element and the external measurement, control, or data acquisition system. Its primary role is to ensure a secure, reliable, and often environmentally sealed connection for signal transmission and/or power supply. This component is typically used in industrial automation, process control, and instrumentation applications where sensors must interface with control systems. The connection head is designed to accommodate various cable types and termination methods, including screw clamps, spring clamps, plug connectors, or solder points. It provides a robust mechanical interface that protects the internal electrical connections from environmental factors such as moisture, dust, and vibration. The housing is often made from thermoplastic materials like PBT or PPS, or metals such as stainless steel, brass, or nickel-plated brass, depending on the required corrosion resistance and mechanical strength. Key electrical parameters include rated voltage (24–250 V AC/DC), rated current (5–10 A), contact resistance (≤5 mΩ), insulation resistance (≥100 MΩ), and dielectric strength (1.5–3 kV). The operating temperature range is -40 to 85 °C, and the IP rating can vary from IP54 to IP67, indicating the degree of protection against dust and water ingress. Connection threads are commonly M12 to M20, and the weight ranges from 0.05 to 0.2 kg. These specifications are reference values and must be verified with the manufacturer for the specific model. The connection head is selected based on the sensor type, cable specifications, environmental conditions, and electrical requirements. Proper installation and maintenance are essential to ensure reliable operation and to prevent failures such as short circuits, signal loss, or insulation breakdown.
The connection head functions by providing a physical and electrical interface. Internal terminals are connected to the sensor's internal leads. External cables are then attached to these terminals via screw clamps, spring clamps, plug connectors, or solder points. This creates a continuous conductive path, allowing electrical signals (e.g., voltage, current, resistance) generated by the sensor to be transmitted out, or allowing power to be supplied to the sensor. The housing provides mechanical protection and may include sealing elements to achieve the specified IP rating. The design ensures that the electrical connections are secure and that the signal integrity is maintained under normal operating conditions.
