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:
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180 day calibration interval
Integral scrolling LED display
SIL-1 rated
Integral alarm relays – High, Low, Trouble
Aluminum or 316 Stainless Steel enclosure
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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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