Fixed Type Gas & Flame Detection

Infrared Combustible Gas Sensor Module 5100-28-IT

The Sentry IT Infrared (IR) Combustible Gas Sensor Module is networkenabled to provide the interface needed to your plant-wide control system, whether it be 4-20 mA, Modbus, HART, relay contacts or SentryBus. This USAmade, 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:

⇒ 365-day calibration interval
⇒ FM and UL Approval for performance & safety
⇒ SIL-2 certified
⇒ Modbus RTU RS-485 interface
⇒ 4-20 mA output isolated and non-isolated
⇒ HART Interface option
⇒ SMC Sentry digital bus interface
⇒ ATEX Certified
⇒ Optional alarm relays - Alarm, Warning, Trouble
⇒ Aluminum or 316 Stainless Steel enclosure
⇒ Non-intrusive calibration
⇒ Integral scrolling LED display
⇒ Optional remote sensor
⇒ Remote alarm reset capable

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, InSite Application and multiplexing sensor connections.

Key Feature
⇒ Yearly calibration interval
⇒ Single man, Non-intrusive calibration
⇒ Network-compatible with Modbus, 4-20 mA, Sentry PSG Bus, 4-20mA with HART, alarm relays
⇒ FM and UL Approved for Performance and Hazardous Areas
⇒ SIL-2 Certified
⇒ Bright scrolling LED display


Type: Infrared, Dual Wavelength

Default Range: 0-100% LEL Methane
Optional Range: 0-100% by vol. Methane
Repeatability: +/-1% LEL
Accuracy: +/- 1% for 0-50% LEL range
+/- 2% for 51-100% LEL range
+/- 1% full scale per month
Zero Drift: +/- 1% full scale per month @ 200C (680F) ambient (max +/- 3% full scale per year)
Sensor Life: Typically >5 years
Heated Sensor: Heated cell to prevent condensation
Response Time: T90<10sec**

Display: Fixed and Scrolling LED
Signal Output: Sentry digital bus
Analog 4-20 mA Linear
3-wire Non-Isolated
4-wire Isolated
Serial RS-485 Modbus RTU
Relay: Optional
HART: Optional

Power consumption: 3 watts maximum
Input voltage: 24V DC

Relays: 5 amp Alarm, Warning (0.25 amp Trouble)
5A@ 250V AC, 5A@ 30V DC (Alarm, Warning)
Board includes auxiliary connection for Sentry multiplexing
HART: Termination board includes HART, Modbus RS-485, 4-20mA, Digital Input, 2A Relay output, No Sentry Bus
Remote Sensor: Up to 100 feet (30.4m)

Operating Range
Ambient Temp Range: -400 to 1400F (-400 to 750C)
Relative Humidity: 0-95% Non-Condensing

Dimensions: (HxWxD)
(A1 & A2) = 7.8 x 5.7 x 3.9 in (19.8 x 14.5 x 9.9 cm)
(S1 & S2) = 7.5 x 4.4 x 4.9 in (19 x 11 x 12 cm)
Weight: (A1 & A2) = 3.4 lb. (1.5 Kg)
(S1 & S2) = 7.2 lb. (3.3 Kg)
Enclosure: Epoxy coated Aluminum or 316 Stainless Steel
Housing: AL or SS (same as enclosure)
Enclosure Hazardous Area Classification: Explosion proof, Class I, Div. 1, Groups A, B, C, D Class I, Zone 1, Group IIC, IP66, IP65, NEMA 4X,T6 TA = -400C to 600C II2 GD, Ex d IIC

2 Year Warranty

ATEX II 2 G, Ex d IIB+H2 T6 Gb, Ta = -40 0C to 600C
FM Approval 6320: Combustible Gas Detector Performance
FM Approval 3600: Class I Div. 1, Groups B, C, D 3615, 3810
SIL-2 Certified: IEC 61508
CSA: C22.2 Approved
ABS: Certificate of Design Assessment
CQST: Compulsory Certification
CCOE/PESO: Declaration of Conformity
IECEX: Certificate of Conformity
ANSI/ISA: 12, 13, 01


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