A connection head or terminal block is a critical component of temperature sensors that provides a secure, insulated housing for electrical connections between the sensor probe and external control or monitoring systems. It protects the sensor's internal wiring from environmental factors while ensuring reliable signal transmission. The connection head contains terminal blocks or screw terminals that mechanically secure and electrically connect the sensor's lead wires to external cables. It provides environmental protection (IP rating) and may include features for cable strain relief and electrical isolation. Typical materials include thermoplastic (PBT, PA66), stainless steel, and brass terminals. Key parameters include rated current (10–32 A), rated voltage (250–600 V), wire cross-section (0.2–2.5 mm²), number of poles (2–12), contact resistance (≤5 mΩ), insulation resistance (≥1000 MΩ at 500 V DC), dielectric strength (2.5–4 kV), operating temperature (-40–85 °C), ingress protection (IP20–IP65), housing material (PA66, UL 94 V-0), clamping torque (0.5–0.8 N·m), and weight (10–50 g). These values are reference ranges per IEC 60947-7-1 and IEC 60529; verify model-specific values with the manufacturer. The connection head is selected based on sensor type, cable entry, environmental conditions, and electrical requirements. It is essential for signal integrity and system reliability. Maintenance signals include loose connections, corrosion, or overheating. Failure boundaries include exceeding rated current or voltage, improper tightening torque, or exposure beyond IP rating. Always consult the manufacturer for specific application guidance.
The connection head provides a secure, insulated enclosure for electrical connections. Inside, terminal blocks or screw terminals mechanically clamp the sensor lead wires and external cables, creating a low-resistance electrical path. The housing protects against moisture, dust, and mechanical damage, with an IP rating indicating the level of protection. Strain relief prevents cable pull-out, and insulation resistance ensures signal integrity. Proper tightening torque (0.5–0.8 N·m) is critical to avoid overheating or loose connections. The design allows for easy wiring and maintenance while maintaining electrical isolation between terminals.
