SMC 5100-XX-IT Toxic Gas Detector

The SMC 5100-XX-IT gas detector monitors toxic gases such as Hydrogen Sulfide, Carbon Monoxide, Nitrogen Dioxide, Ammonia, Oxygen Deficiency, and others. The detector requires calibration only every six months, cutting operating costs and time. As part of the SMC Sentry IT platform, the detector can be remotely diagnosed and calibrated via Remote Sensor Capability.

  • Integral LED display - easily calibrate and access gas concentrations, relay statuses, and diagnostics
  • Menu-driven system - rapidly adjust user-friendly configuration of alarm setpoints, calibration, maintenance, and alarm acknowledgment
  • FM Approved 6-Month Calibration Interval - dramatically reduces maintenance for the user
  • SMC Sentry Digital Bus Interface - connect easily with existing Sentry systems that have been in operation for many years
  • GlobalCal™ Support - non-intrusively calibrate all connected sensors at the same time without declassifying the area
  • Internal Continuous Self-Diagnostics - automatically indicate any fault or optics problems
  • Optional remote sensor configuration allows access to the controller over a remote network for convenience or for hard-to-access areas
  • 4-20 mA output - interface effortlessly with common factory communication links and provide flexibility for the output
  • HART Interface - effortlessly communicate over legacy 4-20 mA analog instrumentation wiring
  • Mobus RTU Interface - provides an easy interface to the world’s most common industrial protocol interface

Gas type specifications

Sensor Type

  • Electrochemical


  • Range:
    • Default range as above
    • User selectable alternative ranges Sensor Life: Typically >2 years
  • Sensor Life: Typically >2 years


  • Display: Fixed and scrolling LED
  • Signal Outputs:
    • Sentry digital bus
    • Analog 4-20mA
    • 3-wire non-isolated
    • 4-wire isolated
    • Serial RS-485 Modbus RTU
  • Relay: Optional


  • Relays:
    • 5 amp Alarm, Warning (0.25 amp Trouble)
    • 5A @ 250 VAC, 5A @ 30 VDC (Alarm, Warning)
    • Board includes auxiliary connection for Sentry multiplexing
  • HART: Termination board includes HART, MODBUS RS-485, 4-20mA, Digital Input, 2A Relay output, no Sentry bus


  • Power consumption: 2 watts maximum
  • Input voltage: 24 VDC nominal: 10-30 VDC

Remote Sensor Option

  • 5100-03-IT: 10 feet
  • 5100-04-IT: 15 feet
  • 5100-05-IT: 15 feet

Built-in-Test (BIT)

  • Manual and Automatic


  • Dimensions: (H x W x D) (differs for 5100-25-IT & 5100-26-IT)
    • A1 & A2: 7.9 x 5.7 x 3.9 in. (20.1 x 14.5 x 9.9 cm)
    • S1 & S2: 7.6 x 4.4 x 4.9 in. (19.3 x 11.2 x 12.4 cm)
  • Weight:
    • A1 & A2: 3.4 lb. (1.5 Kg)
    • S1 & S2: 7.2 lb. (3.3 Kg)
  • Housing: Epoxy-coated, die-cast, copper-free aluminum or 316 stainless steel
  • Rating:
    • Explosion proof, Class 1, Div. 1, Groups B, C, D
    • Group IIB + H2 IP66, IP65, NEMA 4X
  • Warranty: 2 years

Approvals subject to change without notice and may differ based on configuration, part number and/or country.
Contact Customer Service or check approval label on product for specific approval information.