Sierra Monitor Corporation Carbon Monoxide Alarm 5100 28 IT User Manual

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:  
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  
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  
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Local scrolling display  
Ease of calibration and easy access to gas  
concentration, relay status and diagnostics  
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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  
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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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