DIN vs Metric Electrical Connections
DIN Plugs
DIN 43650 plugs are a popular choice for connecting smaller devices like transducers and solenoid valves in industrial applications. These plugs are sometimes mistakenly referred to as “Hirschmann Plugs” but come in three distinct forms:
- Form A: Large square plugs used in applications requiring a robust connection.
- Form B: Smaller rectangular plugs, often found in compact setups.
- Form C: Small square plugs ideal for limited-space installations.
Features
- Standardisation: DIN plugs follow the DIN 43650 standard, ensuring compatibility across various devices and manufacturers.
- Ingress Protection: Most DIN plugs offer IP65 to IP67 protection, making them resistant to dust and water, and suitable for industrial environments.
- Ease of Maintenance: The modular design allows for quick replacement or reconfiguration without the need for specialised tools.
Common Applications
- Hydraulic and Pneumatic Systems: Connecting solenoid valves, pressure switches, and flow sensors.
- Process Control: Used in control systems for temperature, pressure, and flow measurements.
Installing a DIN Plug to a Sensor
- Prepare the Cable: Strip the multi-core cable to expose the individual wires. Then strip the ends of each wire.
- Assemble the Plug: Remove the base of the DIN plug. Thread the cable through the gland and connect each wire to the appropriate terminal on the base.
- Reassemble and Secure: Reattach the plug components, ensuring the rubber seals are intact and properly aligned. Tighten the cable gland to prevent moisture ingress.
Troubleshooting Tips
- Loose Connections: If the device isn’t functioning correctly, check the tightness of the connections within the DIN plug.
- Seal Integrity: Ensure that the rubber seals are properly seated to maintain IP ratings.
Metric D-Coded Connectors
Metric connectors, such as the 4-pin M12, are increasingly favoured for their ease of use and high reliability in industrial settings. These connectors are commonly used in devices like proximity switches, and solenoid valves.
Advantages
- Secure Locking Mechanism: The metal collar provides a secure connection that resists vibration and movement.
- High Ingress Protection: With ratings of IP68 or IP69, these connectors are ideal for harsh environments, including washdown areas.
- Versatility: Available in various configurations, including 3-pin, 4-pin, and 8-pin options, to accommodate different types of devices.
Common Applications
- Automation Systems: Widely used in factory automation for connecting sensors and actuators.
- Robotics: Employed in robotic systems for reliable sensor connections.
- Environmental Monitoring: Suitable for outdoor sensors due to high resistance to water and dust.
Installing a Metric Connection to a Sensor
- Align and Connect: Simply align the plug with the socket and insert it.
- Twist to Lock: Turn the metal collar to lock the connection securely in place.
Additional Considerations
- Cable Lengths: Choose the correct cable length to avoid unnecessary strain on the connector.
- Material Selection: Depending on the environment, you may need cables with specific sheathing materials, like PVC for general use or PUR for flexible, high-durability applications.
- EMI Shielding: For environments with high electromagnetic interference, consider using connectors and cables with shielding to maintain signal integrity.
