The Dungs GW 500 A4 is a compact, adjustable pressure switch designed for monitoring and controlling pressure in gas and air systems, particularly in burner control applications. Here's a detailed overview of its specifications and functionality:

 Technical Specifications

• Max Operating Pressure: 500 mbar (50 kPa)
• Pressure Connection: G 1/4 female thread (standard), with optional additional connection
• Protection Class:
  • GW 500 A4: IP 54 (clear cover)
  • GW 500 A4/2: IP 65 (metal housing)
• Switching Function:
  • As pressure rises: 1 NC opens, 2 NO closes
  • As pressure falls: 1 NC closes, 2 NO opens
• Switching Mechanism: Rubber diaphragm acts against a spring to trigger a microswitch
• Setting Mechanism: Pressure setpoint adjusted via a scale-equipped setting wheel
• Switching Difference : Defined as the pressure difference between upper and lower switching points