PD138 Minimux II Temperature & 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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