Sierra Monitor Corporation 5100-28-IT - Manual

Sentry IT Gas Sensor Module
IT Combustible - Infrared
Sierra Monitor Corporation 1991 Tarob Ct. Milpitas, CA 95035 (408) 262-6611 (800) 727-4377 Fax: (408) 262-9042
Web site: www.sierramonitor.com E-Mail: [email protected]
Proven Performance
Proven Technology
Proven Support
Information Technology (IT) at the component level!
An Infrared (IR) Combustible Gas Sensor Module is
network-enabled to provide the interface needed to
your plant-wide control system, whether it be 4-20
mA, Modbus, HART, relay contacts or SentryBus.
This USA-made, stand-alone smart gas sensor
module is loaded with features you need. As usual,
Sierra Monitor A gas detector with a Sierra Monitor
pedigree, Factory Mutual approved and ready to
Manage 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-2 Certified
• Modbus RTU RS-485 interface
• 4-20 mA output
• HART interface
• SMC Sentry digital bus interface
• Optional Integral alarm relays – Alarm,
Warning and Trouble
• Aluminum or 316 Stainless Steel enclosure
• Annual calibration frequency
• %LEL or % volume
• Interface to multiple protocols
• Integral scrolling LED display
• Optional remote sensor
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 communications, extensive
diagnostic features, area and zone alarm
management, WebServer interface and multiplexing
sensor connections.
Factory Mutual (FM) Approval for performance,
electrical safety and environmental parameters
including Class I, Div. 1, Groups C, D and Class I,
Zone 1, Group IIC. The 5100-28-IT is also SIL-2
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 wavelength as it
passes through the gas. The more of the absorbing
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 difference in energy received by the
detector indicates the level of gas in the
atmosphere.
Features Benefits
 Non-intrusive calibration, menu driven system Able to easily and quickly calibrate module without
declassifying the area
 Network compatible with Modbus, 4-20mA, Sentry
bus, HART, relay interface
Easy to install in a variety of field applications plus
easy to obtain critical safety information wherever
needed
 FM Approved for performance and hazardous
area operation, Class I, Div. 1, Group C, D, with
NEMA 4X enclosure rated for -40
o
to 176
o
F areas
For safe and reliable operation in hazardous areas
 SIL-2 Certified Meets long term reliability design standards
 Local scrolling display Ease of calibration and easy access to gas
concentration, relay status and diagnostics