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Sierra Monitor Corp. 1991 Tarob Court Milpitas, CA 95035 USA (408) 262-6611 (800) 727-4377 Fax: (408) 262-9042
Visit our website: www.sierramonitor.com E-mail: sales@sierramonitor.com
Combustible Gas Sensor Module
Infrared
Proven Performance
Proven Technology
Proven Support
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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:
• FM Approval for performance and safety
• SIL Certified - SIL-1
• Aluminum or 316 Stainless Steel enclosure
• 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
• Optional remote sensor
• Optional integral 8 amp relays
The 5100-28-IT can be used as a 4-20 mA component
or as a Modbus RTU node. For higher level system
capability the module can interface directly to Sierra
Monitor’s Sentry Controller. As part of a Sentry system
the user gains capability of system Modbus serial com-
munications, extensive diagnostic features, area and
zone alarm management, LanServer interface and mul-
tiplexing sensor connections.
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
Most combustible gases absorb infrared light energy at
defined wavelengths, providing an absorption signature
for that gas. The principle of an infrared detector is based
upon the absorption of the infrared light at a specific wave-
length as it passes through the gas. The more of the ab-
sorbing gas that is present, the more light is absorbed.
The detector measures the energy from an infrared light
beam at a wavelength that is absorbed by the gas and
compares it to the energy emitted by the source. The dif-
ference in energy received by the detector indicates the
level of gas in the atmosphere.