Series DX Wet/Wet Differential Pressure Switch

Series DX incorporates an externally adjustable set point, integral mounting flange and a removable electrical terminal block for quick and easy installation. The DX uses opposing diaphragms to sense the high and low pressure with a pivot mechanism that transfers the difference of the two pressures to the SPDT switch.


• Indicating filter differential pressure. For example initiating water filter backwash as the filter becomes clogged on increasing differential pressure.

• Proof of flow indicator monitoring differential pressure from a sensing device. For example sensing the pressure across an orifice plate to prove water flow.

• Proving flow through a pump by sensing the pressure across the pump to make sure the pump does not run dry.

• Proving flow through a chiller. Often called evaporator water pressure drop.

• Proving flow through a heat pump or AC unit. Often called a condenser water lockout switch


  • Service: Compatible gases and liquids.
  • Wetted Materials: Connection: Brass; Diaphragm: Fluoroelastomer.
  • Temperature Limits: 30 to 140°F (-1 to 60°C).
  • Pressure Limits: 200 psig (13.8 bar).
  • Enclosure Rating: Weatherproof UL type 4X (IP65).
  • Repeatability: ±2% of full range.
  • Switch Type: SPDT snap switch.
  • Electrical Rating: 5 A @ 125/250 VAC, 5 A res. @ 30 VDC.
  • Electrical Connection: Removable terminal block.
  • Conduit Connection: 0.871″ diameter hole for 1/2″ conduit fitting.
  • Process Connection: 1/4″ NPT female. Continuous single side only pressure should not exceed 1.25 x full differential range.
  • Mounting Orientation: Ports on horizontal plane, ±10°.
  • Set Point Adjustment: External screw.
  • Housing Materials: Body: Aluminum; Housing: Polycarbonate; Cover: 300 SS.
  • Vibration and Shock: Set point repeats after 2.5 Gs, 5 to 500 Hz. Set point repeats after a 15 Gs, 10 millisecond duration.
  • Altitude Limit: 6560 ft (2000 m).
  • Humidity Limit: 80% (non-condensing).
  • Pollution Degree: 2.
  • Environment: Intended for indoor and outdoor use.
  • Weight: 1 lb 3 oz (0.54 kg).
  • Agency Approvals: CE, CUL, UL.