PD138 MINIMUX II Temperature and Process Scanner

Brand: Precision Digital Corporation

The MINIMUX® II PD138 is a microprocessor-based, eight-channel analog input scanner/multiplexer and annunciator that provides low-cost automatic switching for multi-point display and alarm systems.

It can automatically switch up to eight inputs to another device such as a digital panel meter, controller, or PLC.

Signal switching is done via reed relays making the PD138 ideal for switching thermocouples, RTDs, control loops, and AC/DC signals.

They feature rugged NEMA 4X/IP65 fronts and a wide operating temperature range.

They can be programmed for many common ISA alarm sequences including first out indication and they provide alarm signaling through front panel LEDs and a build in 85 dB horn.

Custom printed message labels available
  • 8 Inputs per Unit, Eliminates Need for 7 Displays 
  • Unlimited Number of Units per System 
  • Free Custom Message Labels 
  • Thermocouples, RTDs, Process, AC & DC Inputs 
  • Adjustable Dwell Time for Each Channel 
  • Independent Alarm Input for Each Channel 
  • First-out Alarm Indication 
  • Alarms Indicated by LEDs, Built-in Horn, and Relay 
  • Built-in 85 dB Horn with Silence Pushbutton 
  • Stop-on-alarmed Channel - Field Select
  • Non-interruptible 4-20 mA Inputs 
  • Sunlight Readable Indication 
  • NEMA 4X/IP65 Front 
  • Shallow Depth 1/8 DIN Enclosure 
  • -40 to 65°C Operating Temperature Range 


Enclosure, Body Material

  • High Impact Plastic

Environmental Protection

  • IP65
  • NEMA 4X


  • 0 to 90 % Non-Condensing


  • 8-Channels

Operating Temperature

  • -40° to 65° C (-40° to 150° F)


  • 10 W

Power Supply

  • 115 Vac
  • 12-24 Vdc
  • 230 Vac


  • 0.2 ohms

Storage Temperature

  • -40° to 85° C (-40° to 185° F)

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