Series ISDP Intrinsically Safe Differential Pressure Transmitter

Brand: Dwyer Instruments, LLC

The Series ISDP Differential Pressure Transmitter provides a 4-20 mA process output, a robust NEMA 4X enclosure, plus a large LCD display that can be programmed to read in pressure, velocity or flow.

The ISDP offers simplified programming via a menu key that enables the user to select: security level; English or Metric engineering units; pressure, velocity or flow operation, K-factor for use with various Pitot tubes and flow sensors, circular or rectangular duct size for volumetric flow operation plus many more. 

The Series ISDP Differential Pressure Transmitter is powered on its two wire loop with 10-35 Vdc via its integral M-12 four pin male connector. The ISDP provides a 0.5% full scale accuracy on ranges from 0.25 to 100 Inches WC as well as bi-directional models up to 10 Inches WC. 

These features make the Series ISDP Differential Pressure Transmitter the ideal instrument for monitoring pressures or air flows in hazardous zones having a Class I Div. I Groups A, B, C, D; Class II Div. I Groups E, F, G; Class III Div. I ratings.
  • NEMA 4X rated enclosure provides protection in harsh environments permitting outdoor monitoring or in areas where dust and particulate matter exists
  • Easy to read LCD display provides immediate local alerts allowing corrective action to be taken quicker to eliminate the problem from becoming widespread
  • Intrinsically safe for use in the specified hazardous locations meets specifications where pressure transmission and safety cannot be compromised
  • Password protected set up menu helps to insure no errors by untrained personnel when accessing the powerful measurement capabilities of this device



  • ± 0.5 % at 25° C (77° F) Including Hysteresis & Repeatability,

Approvals & Certifications

  • CE
  • FM
  • IEC

Approvals & Certifications

  • Factory Calibration Certificate

Compensated Temperature

  • 0° to 60° C (32° to 140° F)


  • 4-Digit LCD 0.6” Height

Electrical Connectors

  • M12 4-Pin Connector

Enclosure, Body Material

  • Aluminum
  • Glass

Environmental Protection

  • IP66
  • NEMA 4


  • Air
  • Non-Corrosive Gases


  • NIST

NPT Connection

  • 1/8” NPT Female


  • 4-20 mA (Direct Current)

Power Requirement

  • 10-35 Vdc

Pressure Range

  • Inches WC: 0 to 100

Pressure Type

  • Differential

Response Time

  • 250 milliseconds (Damping Set to 1)

Sensor Orientation

  • Mount Unit in Vertical Plane

Span & Zero Adjustments

  • Accessible Via Menus


  • < ± 1 % Per Year

Temperature Effect

  • 0.020 %/°F (0.036/°C) from 25° C (77° F)

Temperature Range

  • 0° to 60° C (32° to 140° F)

Wetted Materials

  • Alumina Ceramic
  • Aluminum
  • Epoxy
  • Glass
  • Gold
  • Nickel
  • PVC
  • RTV
  • Silicone
  • Stainless Steel

  • Hazardous Zone Pressure Control Applications
  • Hazardous Flow and Control Applications
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