PD8-150 ProtEX-MAX Explosion-Proof Alarm Annunciators

Brand: Precision Digital Corporation

The ProtEX-MAX PD8-150 offers all the functionality of the Vigilante II PD150 as a fully FM, CSA, ATEX, and IECEx approved explosion-proof product.

It provides alarming and monitoring capabilities for all of your level, pressure, flow, and other process switches.

These explosion-proof alarm annunciators are available in two models; the PD8-154 has four (4) inputs and the PD8-158 has eight (8) inputs.

Each model accepts inputs from relays, float switches, digital outputs, and many other discrete (on/off) devices.

They can be field programmed for all common ISA alarm sequences including first out indication and provide alarm signaling through front panel LEDs and a built in audible horn.

Additional audible devices may be triggered through the use of relays. The silence, acknowledge, and reset functions can be operated without opening the housing by using the built-in SafeTouch® through-glass buttons.

Custom printed message labels can be included with your order at no additional charge.
  • Modern, Sleek and Practical Enclosure
  • Display Mountable at 0°, 90°, 180°, & 270° Degrees
  • Explosion-proof, IP68, NEMA 4X Enclosure
  • Vigilante® II Functionality
  • SafeTouch® Through-Glass Button Programming
  • Sunlight Readable Displays
  • 8 Field Selectable Sequences
  • All Common ISA Sequences Including First-Out
  • Switch, Transistor, and Logic Level Inputs
  • 4-Point Monitoring
  • Free Custom Message Labels
  • Universal Power Supply 85-265 Vac
  • 12-36 Vdc/12-24 Vac Power Option
  • Built-In 85 dB Horn
  • 2 SPDT Relays for Alarm Activated Devices
  • 24 Vdc Isolated Power Supply (AC Models)
  • Multiple-Unit First-Out Indication
  • Silence, Acknowledge, and Reset Functions
  • Sunlight Readable Indication


Approvals & Certifications

  • ATEX, II 2 GD Ex d IIC T* Gb Ex Tb IIIC T90° C Db
  • CSA Class I, Division 1, Groups B, C, D, Class II, Division 1, Groups E, F, G Class III, Division 1, Class I, Zone 1 Ex d IIC Zone 21 Ex Tb IIIC T90° C
  • FM Class I, Division 1, Groups B, C, D Class II, Division 1, Groups E, F, G Class III, Division 1, T5/T6 Class I, Zone 1, AEx d, IIC Gb T5/T6 Zone 21, AEx Tb IIIC T90° C
  • IEC Ex d IIC T* Gb Ex Tb IIIC T90° C Db


  • Modbus


  • 4-Digit LED

Electrical Contacts

  • Normally Closed
  • Normally Open

Enclosure, Body Material

  • Aluminum

Environmental Protection

  • IP66
  • IP68
  • NEMA 4X
  • NEMA 7
  • NEMA 9


  • ± 10 VCD
  • 0-20 mA
  • 4-20 mA

Operating Temperature

  • -40° to 65° C (-40° to 150° F)

Power Supply

  • 12-36 Vdc
  • 85-265 Vac


  • 2 SPDT (Form C)
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