Sierra Monitor 5100-28-IT User Manual

Sentry IT Gas Sensor Module

IT Combustible - Infrared

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 176oF 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

Sierra Monitor Corporation 1991 Tarob Ct. Milpitas, CA 95035 [phone] (800) 7 27-4377 Fax: [phone]

Web site: www.sierramonitor.com E-Mail: [e-mail]

Sentry IT Gas Sensor Module

X

IT Combustible - Infrared

Specifications:

Sensor type: Infrared, Dual Wavelength
Performance

Dual Range:
Default: 0-100% LEL Methane
User Setting: 0-100% by vol. Methane
Repeatability: +/-1% LEL
Accuracy: +/- 1% for 0-50% LEL range
+/- 2% for 51-100% LEL range
Sensor Life: Typically >5 years
Heated Sensor: Heated cell to prevent condensation
Response Time: T90<10sec*

Output:

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

Options:

Relays: 5 amp Alarm, Warning (0.25 amp Trouble)
5A@ 250 VAC, 5A@ 30VDC (Alarm, Warning)
Board includes auxiliary connection for Sentry

HART: Termination board includes HART, Modbus RS-

Power:
Power consumption: 3 watts
Input voltage: 24 VDC nominal: 10-30VDC

Operating Range:

Ambient Temp Range: -40
Relative Humidity: 0-99% Non-Condensing

multiplexing
485, 4-20mA, Digital Input, 2A Relay output, No

Sentry Bus

o

to 140oF (-40o to 60oC)

Construction:

Dimensions: (H x W x D)
(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)
Hazardous Area
Classification: Explosion proof, Class 1, Div. I, Groups C, D
Class I, Zone 1

Warranty: 2 years
Approvals:
FM Approval 6320 Combustible Gas Detector Performance

FM Approval 3600 Class I Div. 1, Groups C, D
SIL-2 Certified Certified by Lloyd's Register (IEC 61508)
CSA For enclosure in hazardous locations
ABS Certificate of Compliance
CQST

Specifications subject to change without notice
* T60<10 sec NRTL Approved option for noise suppression

Group IIC, IP66, IP65, NEMA 4X, T6
TA = - 40

o

C to 85oC II2 GD, Ex d IIC

Ordering Information:

Relay/Connection

Model Enclosure

Output

Gas Type

5100-28-IT - XX - XX -XX -

- A1 = AL ¾” NPT - 01 = No Relays (std) - 01 = Methane (Std.) - 0 = Standard - 0 = None

- A2 = AL M20 x 1.5 - 02 = Relays Option - 2 = Conformal - 1 = Remote

- S1 = SS ¾” NPT - 05 = HART Option Transmitter Sensor

- S2 = SS M20 x 1.5

Accessories:

5311-00 Rainshield
5311-02 Rainshield with calibration port

Calibration Accessories:
5358-01 Calibration Head, Standard
5360-00 Calibration Gas Delivery Fitting

Calibrators High Capacity:
1250-01 Gas Sensor Calibration Kit, Type A (CO, H
1260-02 Combustible Gas 50% LEL Gas Cylinder Type A

S)

2

Sensor
Protection

- X

Remote Option

Rev. 5/13

Sierra Monitor Corporation 1991 Tarob Ct. Milpitas, CA 95035 [phone] [phone] Fax: [phone]

Web site: www.sierramonitor.com E-Mail: [e-mail]