Sierra Monitor Corporation Carbon Monoxide Alarm 5100 02 IT User Manual

Combustible Gas Sensor Module  
Catalytic Bead  
Only FM Performance Approved  
Catalytic Bead Combustible Gas  
Sensor Module with 180 day  
Calibration Interval, twice as long as  
the industry standard resulting in half  
the maintenance costs!  
The 5100-02-IT Combustible Gas Sensor Module is a  
key member of the powerful Sierra Monitor IT Series  
family of gas sensor modules. The 5100-02-IT provides  
the features needed by safety and instrumentation en-  
gineers including:  
180 day calibration interval  
Integral scrolling LED display  
SIL-1 rated  
Integral alarm relays – High, Low, Trouble  
Aluminum or 316 Stainless Steel enclosure  
Non-intrusive calibration  
4-20 mA output  
Modbus RTU RS-485 interface  
SMC Sentry digital bus interface  
Remote alarm reset capable  
Optional remote sensor  
180 Day Calibration Interval  
Factory Mutual (FM) Approval for performance, electrical  
safety and environmental parameters including Class I, Div.  
1, Groups B, C, D and Class I, Zone 1, Group IIB+H2 IP66.  
With a NEMA-4X enclosure standard, approved multiplex-  
ing, and approved six month calibration interval, cost of  
ownership is minimized at the acquisition, installation and  
operating stages.  
Optional control relay pack  
Model 5100-02-IT utilizes the proven, reliable, catalytic  
bead technology to monitor for combustible gases (meth-  
ane and others). Output range is 0-100% of Lower Explo-  
sive Limit (LEL). This detector has minimal maintenance  
requirements and is Factory Mutual approved for six month  
calibration intervals. Internal, continuous self-diagnostics  
automatically detect and alarm any fault problems. The  
5100-02-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 enabling system level Modbus serial communi-  
cations, area and zone alarm management, extensive  
system diagnostic features, WebServer interface, and mul-  
tiplexing sensor connections.  
How It Works  
Catalytic Bead gas sensors detect gas by comparing the  
resistance of two heated elements. One element is  
catalytic to enhance the burning of combustible gases, the  
other element is passive. Electronic circuits are used to  
compare the change in the catalytic bead resistance  
relative to the passive bead. The relative change is  
calibrated to determine the concentration of the gas of  
interest.  
Benefits  
Features  
Six-month calibration interval  
Longest rated and FM-approved calibration cycle for  
any catalytic-bead gas detector - reduced mainte-  
nance  
Able to calibrate module without declassifying the area  
Non-intrusive calibration  
Proven and approved for installation in areas where  
combustible gases are located  
FM Approved for Performance and Hazardous  
Areas  
Ease of calibration and easy access to gas concentra-  
tion, relay and alarm status and diagnostics  
Local scrolling display  
Easily meets users needs for access to critical plant  
safety information  
Network-compatible with Modbus, 4-20 mA,  
Sentry bus and relay interface  
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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