D-Series NEMA 4 Differential Pressure Switch

The Ashcroft® D4 Differential Pressure Switch is designed for use on most applications requiring reliability and long-cycle life. Ideal for satisfying requirements for pressure control, shutdown or alarm operations.

Key Features:

  • Adjustable setpoints from 15%-100% of range
  • Fixed or limited adjustable deadband
  • Wide selection of switch elements and wetted materials
  • Specials designs for NACE and fire-safe applications


  • Accuracy: ±1.00% full scale
  • NEMA 4X (IP66) aluminum enclosure
  • Single setpoint
  • Differential pressure ranges: 10" IWD to 600 psid
  • SPDT or DPDT switching option

The D4 Differential Pressure Switch is ideal where accurate and reliable pressure measurement are essential:

Process Market :

  • Offshore Oil Rigs
  • Chemical and Petrochemical Plants
  • Pulp and Paper Mills
  • Power Plants
  • Steel Mills
  • Water and Sewage Treatment Facilities

Industrial Market :

  • Pumps, Compressors and Turbines
  • Boilers and Burners
  • Degreasers and Evaporators
  • Recovery Systems
  • Reverse Osmosis Systems / Filters
  • Food Processing
  • Ground Support Equipment
  • Hydraulic and Lubrication Systems
  • Heating and Air Conditioning
  • Marine Equipment
  • Specialized OEM Equipment
  • CE
  • UL
  • CSA
  • FM