MC-6400 Fixed Gas Detection, 64 Channel Controller by RKI Instruments

MC-6400 Modbus Controller


64 Channel Gas Monitoring


  • 64 Channel Wired Modbus Controller
  • 12 to 35V DC Operating voltage with an optional AC power supply
  • Operating temperature range of -40ºC to +70ºC
  • Graphical LCD with LED backlight
  • 5 Push-button interface (ADD, MENU, SUB, SCAN/ HOLD and RESET/ESC)
  • 4 Individually configurable alarm set-points: Four front panel ALARM LED indicators (Red); 4 dry- contact relays (4 amps maximum per relay)
  • Status LEDs for power and fault: multi-color status light; Amber fault LED for indicating system faults
  • Output options: Wet contact fault terminal, relay 4 can optionally be configured as a fault relay, RS-485 Modbus
  • NEMA-4X weather, water, and chemical resistant enclosure
  • 1-Year limited hardware warranty
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The MC-6400 controller is a 64-channel gas monitoring controller that can communicate with up to 64 gas sensors or transmitters through an RS-485 Modbus communication. Four relays can be individually set up to the full scale gas reading and may be latching or non-latching. Used in conjunction with RKI’s transmitters to create a safer working environment.

The MC-6400 controller represents the latest leading edge technology in fixed gas detection today.

Related Services

Fixed Systems Turnkey Solutions

  • Design, Consultations, and Engineering
  • Installation
  • Start-up
  • Training
  • System Maintenance



  • Petrochemical plants
  • Refineries
  • Water & wastewater treatment plants
  • Pulp & paper mills
  • Manufacturing facilities
  • Automotive
  • Semiconductor plants
  • Chemical plants


Product Specifications
Product Type 64 Channel wired Modbus gas monitoring controller
Operating Voltage 12V to 35V DC (standard)
Power Type Wired power
Power Supply 6.25A (150W), 85/264V AC to 24V DC (optional)
Current Draw 275 mA maximum (at 24V DC)
Display Screen 160 x 104 Resolution graphical LCD screen transflective (sunlight readable)

with LED back light

Interface 3 Push-buttons (MENU, ADD, SUB, SCAN/HOLD and RESET/ESC)
Product Mounting 4 Mounting feet, 6 in. W x 12-1/4 in. T (included)

maximum mounting bolt/screw size of 5/16 in. (8mm) diameter

Temperature Range -20°C to +70°C (-4°F to +158°F)
Product Compatibility M2A, T3A, VOC Pro transmitters
Digital Input Up to 64 individual RKI gas detectors using RS-485 Modbus
Relays • 4 Dry-contact relays with 4 amp replaceable fuses

• Fault terminal

• Optional to disable alarm relay

• Latching and non-latching relay settings

Enclosure Materials NEMA-4X enclosure, waterproof, chemical, and weather resistant
Wiring Hubs Supplied with two 3/4” conduit hubs on bottom of housing. Can be located on sides or top if specified when ordering.
Accessories Optional horn and/or strobe on housing (uses 1 or 2 of available relays)
Product Dimensions 10 in, L x 8 in. W x 6 in. H (Max. dimensions with attachments)
Total Weight 8.5 lbs
Hardware Warranty 1-Year Limited
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