Combustible Gas Sensor Module
Infrared
Proven Performance
Proven Technology
Proven Support
Information Technology (IT) at the component level! An
infrared (IR) Combustible Gas sensor module with the
brilliance to provide Sentry, 4-20 mA or Modbus output.
A stand alone module with the intelligence to provide
integral alarms. A base model already loaded with fea-
tures you need. A gas detector with a Sierra Monitor
pedigree, Factory Mutual approved and ready to Man-
age Your Gas Risk. The 5100-28-IT provides all the
built-in features desired by instrumentation and safety
professionals, including:
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FM Approval for performance and safety
SIL Certified - SIL-1
Aluminum or 316 Stainless Steel enclosure
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Integral alarm relays – High, Low, Trouble
Integral scrolling LED display
4-20 mA output
Modbus RTU RS-485 interface
SMC Sentry digital bus interface
Option for non-Methane gas configuration
Annual calibration frequency
Interface to multiple protocols
Remote alarm reset
Factory Mutual (FM) Approval for performance, electri-
cal safety and environmental parameters including Class
I, Div. 1, Groups B, C, D and Class I, Zone 1, Group
IIB+H2 IP66. The 5100-28-IT is also SIL Certified and
meets NFPA-72 requirements for gas detectors.
How It Works
Optional remote sensor
Optional integral 8 amp relays
Most combustible gases absorb infrared light energy at
defined wavelengths, providing an absorption signature
The 5100-28-IT can be used as a 4-20 mA component for that gas. The principle of an infrared detector is based
or as a Modbus RTU node. For higher level system upon the absorption of the infrared light at a specific wave-
capability the module can interface directly to Sierra length as it passes through the gas. The more of the ab-
Monitor’s Sentry Controller. As part of a Sentry system sorbing gas that is present, the more light is absorbed.
the user gains capability of system Modbus serial com- The detector measures the energy from an infrared light
munications, extensive diagnostic features, area and beam at a wavelength that is absorbed by the gas and
zone alarm management, LanServer interface and mul- compares it to the energy emitted by the source. The dif-
tiplexing sensor connections.
ference in energy received by the detector indicates the
level of gas in the atmosphere.
Features
Benefits
Local scrolling display
Ease of calibration and easy access to gas
concentration, relay status and diagnostics
Non-intrusive calibration, menu driven system
Able to easily and quickly calibrate module without
declassifying the area
FM Approved for performance and hazardous area For safe and reliable operation in hazardous areas
operation, Class I, Div. 1, Group B, C, D.
NEMA 4X rated for -40o to 176oF areas
Flexible Modbus, 4-20mA, Sentry bus, relay interface Easy to install in a variety of field applications plus easy
to obtain critical safety information wherever needed
SIL Certified
Meets long term reliability design standards
Sierra Monitor Corp. 1991 Tarob Court Milpitas, CA 95035 USA (408) 262-6611 (800) 727-4377 Fax: (408) 262-9042
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