Sierra Monitor Corporation Sentry 5100-28-IT User manual

Sentry IT Gas Sensor Module
IT Combustible - 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 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 Mu-
tual 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 8 AMP alarm relays – Alarm,
Warning
•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 com-
munications, extensive diagnostic features, area and
zone alarm management, WebServer 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
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
forthatgas. Theprincipleofaninfrareddetectorisbased
upontheabsorptionoftheinfraredlight at a specificwave-
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.
Sierra Monitor Corporation 1991 Tarob Ct. Milpitas, CA 95035 USA [phone] [phone] Fax: [phone]
Visit our website: www.sierramonitor.com E-mail: [e-mail]

IR Combustible Gas Sensor Module
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Rev. 10/11
Ordering Information
Model Enclosure Relay/Connection Gas Type Protection Remote
5100-28-IT - XX - XX - XX - X - X
- A1 =AL 3/4” NPT - 01 = No Relays (std.) - 01 = Methane (std.) - 0 = Standard - 0 = None
- A2 = AL M20 x 1.5 - 02 = Relays Option - 1 = Remote
- S1 = SS 3/4” NPT - 05 = HART Option Sensor
- S2 = SS M20 x 1.5
Specifications subject to change without notice
Sierra Monitor Corporation 1991 Tarob Ct. Milpitas, CA 95035 USA [phone] [phone] Fax: [phone]
Visit our website: www.sierramonitor.com E-mail: [e-mail]