Sierra Monitor 5100-02-IT User Manual

Sentry IT Gas Sensor Module

IT Combustible – Catalytic Bead

Proven Performance - FM Approved

Cost effective - 180 day Calibration

frequency, maintenance cut in half!

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 5100-02­IT provides the features needed by safety and
instrumentation engineers including:

• 180 day calibration interval

• 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 and Trouble alarm relays
– Alarm, Warning

• Aluminum or 316 Stainless Steel enclosure

• Non-intrusive calibration

• Integral scrolling LED display

• Optional remote sensor

• Remote alarm reset capable

Model 5100-02-IT utilizes the proven, reliable,
catalytic bead technology to monitor for combustible
gases (methane and others). Output range is 0­100% of Lower Explosive 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
communications, area and zone alarm
management, extensive system diagnostic features,
WebServer interface, and multiplexing sensor
connections.

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 IIC, IP66. With a NEMA-4X
enclosure standard, approved multiplexing, and
approved six month calibration interval, cost of
ownership is minimized at the acquisition,
installation and operating stages

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 us ed 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.

Features Benefits

 Six-month calibration interval Longest rated and FM-approved calibration cycle for

any catalytic-bead gas detector - reduced maintenance

 Non-intrusive calibration Able to calibrate module without declassifying the area
 Network-compatible with Modbus, 4-20 mA,

Sentry bus, HART and relay interface
 FM Approved for Performance and Hazardous

Areas

Easily meets users needs for access to critical plant
safety information

Proven and approved for installation in areas where
combustible gases are located

 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]

X

IT Combustible Gas Sensor Module

Specifications:

Sensor type: Infrared, Dual Wavelength
Performance

Range:
Repeatability: +/-1% LEL
Response Time: T60<10sec
Calibration freq: 180 days
Accuracy: +/- 1% for 0-50% LEL range
+/- 2% for 51-100% LEL range

Output:

Display: Fixed and Scrolling LED
Signal Output: Sentry digital bus
Analog 4-20 mA
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 max.
Input voltage: 24 VDC nominal: 10-30VDC
RFI/EMI Protection: EN50081-2, EN50082-2

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 176oF (-40o to 80oC)

Construction:

Dimensions: (H x W x D)
(A1 & A2) 6.9 x 5.7 x 3.9 in. (17.5 x 14.5 x 9. 9 cm)
(S1 & S2) 7.5 x 5.0 x 4.4 in. (19 x 13 x 11 cm)
Weight:
(A1 & A2) 3.4 lb. (1.5 Kg)
(S1 & S2) 7.2 lb. (3.3 Kg)
Housing: Epoxy coated Aluminum or 316 Stainless Steel
Hazardous Area
Classification: Explosion proof, Class I, Div. 1,

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

FM Approval 3600 Class I Div. 1, Groups B, 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

Remote Sensor Option

It is often necessary to sample the combustible gas at some
distance from the gas sensor module. The IT Series enables
the user to mount the sensor remotely from the transmitter
without the need for expensive and high-maintenance
sample pumps. The Remote Sensor Option provides a
separate gas sensor that can be mounted up to 50 feet from
the transmitter and connected via a cable included.

Groups B, C, D Class I, Zone 1,
Group IIC, IP66, IP65, NEMA 4X
II2 GD, Ex d IIC T6 = -40

o

C to 85oC

Ordering Information:

Model

Enclosure

5100-02-IT - XX

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

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

- S1 = SS ¾” NPT - 05 = HART Option 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
1260-42 Hydrogen, 50% LEL, Gas Cylinder, Type A
1260-00 Zero Gas (Air), Gas Cylinder, Type A (if satisfactory zero ambient air not available)

Relay/Connection
Output

- XX

S)

2

Gas Type

-XX

Sensor
Protection

-

Remote Option

- X

Rev. 5/13

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]