Model QPM11NO/NC — Adjustable Pressure Switch Controller for Air Pumps (Normally Open / Normally Closed) Why you need it Automates air pump operation by switching power on or off at the chosen pressure setpoint, saving energy and preventing overpressurization. Reduces wear on pumps and compressors by eliminating unnecessary run time and cycling. Offers flexible control: configurable as Normally Open (NO) or Normally Closed (NC) to match your system wiring and safety requirements. Key benefits Easy pressure control: adjustable setpoint lets you finetune when the pump starts and stops without changing hardware. Versatile switching logic: selectable NO/NC gives compatibility with a wide range of control schemes and safety interlocks. Reliable operation: designed to provide repeatable switching for routine pump control tasks and pressure protection. Primary features Model: QPM11NO/NC Functionality: Adjustable pressure setpoint with selectable normally open or normally closed switch output for direct control of air pumps and related equipment. Compatibility: Intended for use with air pumps, compressors, and pneumatic systems that require pressurebased on/off control; suitable for retrofit or installations where a pressurecontrolled switch is required. Construction: Rugged housing and mounting provisions for stable installation in pump control panels or inline with air plumbing (refer to product label/manual for mounting orientation). Performance: Provides dependable switching to protect pressure vessels and maintain system pressure within desired limits; minimizes pump cycling when set correctly. Simple operation Adjust the pressure setpoint using the builtin control (follow installation instructions). Select switch logic (NO or NC) according to your control circuit or safety needs. Wire the switch into your pump's control circuit per local electrical codes and the product wiring diagram. Use cases Air compressor tank control: Automatically stop the compressor when the tank reaches the set pressure and restart it when pressure drops, preventing overfill and reducing power consumption. Pneumatic system protection: Maintain consistent operating pressure for airoperated tools or equipment by cycling the pump based on demand. Aquarium/pond or aeration systems: Control air pumps to maintain desired aeration pressure or to protect blowers from running dry or overpressurizing lines. What's included / installation notes QPM11NO/NC pressure switch (refer to supplied documentation for wiring diagrams and installation guidance). Requires appropriate electrical wiring and mounting hardware per local codes; verify compatibility with pump voltage and current ratings before installation. Why this switch works for you The QPM11NO/NC combines adjustable pressure control with selectable switch logic in a single compact controller, giving you flexibility and simplicity for pressurebased pump automation. Its straightforward adjustability and NO/NC option make it a practical choice for maintenance, retrofit, and system applications where reliable pressure switching is needed. For safe and performance, follow the manufacturer's installation and wiring instructions and ensure the switch is used within the limits of the connected pump and system components.