Solid State H2S Gas Sensor Module 5100-15-IT

Sierra Monitor’s 5100-15-IT module monitors Hydrogen Sulfide (H2S), a foul toxic gas capable of killing facility personnel.

The 5100-15-IT module is based on solid state (semiconductor) nanotechnology, a simple and robust method of detection capable of detecting low points-per-million (ppm) levels of gases.

Utilizing the solid state NTMOS (nanotech metal oxide semiconductor) technology, the 5100-15-IT module has a long life cycle and fast response times. For higher level system capability, the module can interface directly to Sierra Monitor’s Sentry Controller to enable system level Modbus serial communications, area and zone alarm management, extensive system diagnostic features, WebServer interface, and multiplexing sensor connections.

The Solid State H2S Gas Sensor Module 5100-15-IT is approved and certified by a variety of third party agencies, including ATEX and SIL-2. These approvals and certifications assure our customers that we carry only the highest quality of products.


The 5100-15-IT supports GlobalCal™, our unique global calibration feature of the Sentry IT Controller. This allows a single technician to calibrate connected detectors from the Sentry IT Controller. With GlobalCal, the calibration happens at the controller level. Multiple sensors can be connected to a single controller, allowing groups of sensors to be calibrated at the same time. Standard gas is applied remotely, using permanently installed tubing, rather than direct delivery to the fixed gas detector.

GlobalCal reduces labor costs associated with calibration. The need to shut down active process areas for calibration consequently costs facilities thousands of dollars in lost production time. GlobalCal, with its remote and non-intrusive methods, allows production to continue during the calibration process, thus avoiding the costs of lost production. In addition, factory-authorized service technicians performing gas detector calibration save time and costs by remotely calibrating all gas detectors at once from the Sentry IT Controller.

Solid State H2S Gas Sensor Module 5100-15-IT

  • 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 Non-Intrusive Calibration – Calibrate the module without declassifying the area
  • 3 Month Calibration Interval – Dramatically reduce maintenance for the user
  • GlobalCal™ support – Non-intrusively calibrate all connected sensors at the same time without declassifying the area
  • Optically Isolated 4-20 mA Output – Interface effortlessly with common factory communication links and provide flexibility for the output
  • Modbus RTU Interface –Provide an easy interface to the world’s most common industrial protocol interface
  • SMC Sentry Digital Bus Interface – Connect easily with existing Sentry systems that have been in operation for many years
  • Optional Remote Sensor Configuration – Access the controller over a remote network for convenience or for hard-to-access areas
  • HART Interface – Effortlessly communicate over legacy 4-20 mA analog instrumentation wiring

Specifications for Solid State H2S Gas Sensor Module 5100-15-IT

Gas Type

  • Hydrogen Sulfide (H2S)

Sensor Technology

  • Solid State NTMOS (Nano Technology Metal Oxide Semiconductor)

Operating Range

  • Temperature: -40 o to 167oF (-40o to 75oC)
  • Humidity: 0-99% Non-condensing


  • Range: 0-100 PPM (user selectable alternative ranges)
  • Accuracy: +/- 5%
  • Response Time: T-90 <20 sec.
  • Sensor Life: Typically >5 years


  • Display: Fixed and scrolling LED
  • Signal Outputs:
    • Sentry digital bus
    • Analog 4-20 mA linear
      • 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, 4-20 mA, Digital Input, 2A Relay output, No Sentry bus


  • Power Consumption: 4 watts maximum
  • Input voltage: 24 VDC nominal: 10-30 VDC


  • Dimensions (H x W x D)
    • A1: 8.4 xc 5.7 x 3.9 in. (21.3 x 14.5 x 9.9 cm)
    • A2: 8.8 x 4.8 x 4.9 in. (22.3 x 12.2 x 12.4 cm)
    • S1 & S2: 8.1 x 4.4 x 4.9 in. (20.6 x 11.2 x 12.4 cm)
  • Weight
    • A1: 3.4 lb. (1.5 Kg)
    • A2: 5.4 lb. (2.5 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. I, Groups B, C, D
    • Group IIB + H2 IP66, IP65, NEMA 4X
  • Warranty: 2 years


  • ATEX Approval pending
  • SIL-2 Certification


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