Multi IR Flame Detector 3600-M

Multi IR Flame Detector 3600-M

he 3600-M uses infrared (IR) technology, a reliable design that provides early warning of flaming fires and immunity to false alarms from IR sources such as sunlight and IR projectors.

The 3600-M utilizes a Multi-Spectrum Design, allowing it to detect hydrocarbon and hydrogen flames up to 215 feet away. It can detect a gasoline pan fire at 215 feet or a hydrogen flame at 100 feet in less than 5 seconds. Users can also select different sensitivity levels to ensure no other detectors cross-over detection zones. Other features include a heated window to eliminate condensation and icing, HART and Modbus capabilities for digital communications, low power requirements, and a compact design.

The Multi IR Flame Detector 3600-M is approved and certified by a variety of third party agencies, including FM, ATEX, IECEx, TUV, and CSA. These approvals and certifications assure our customers that we carry only the highest quality of products and performance.


Detect hydrocarbon and hydrogen flames up to 215 feet away


Choose between short and long distance sensitivity ranges, depending on the needs and function


Quickly respond and alarm users of a fire in a swift manner


Eliminate any possible condensation or icing to ensure the detector to function properly


Save energy costs while protecting the facility


Easily install in a variety of field applications and easily obtain critical safety information wherever needed with maximum flexibility and compatibility

Model Number 3600-M
Spectral Response Multi IR Bands
Detection Range (At highest Sensitivity Setting for 1 sq. ft. / 0.1 sq. m pan fire)

215 ft. (65 m) n-Heptane
215 ft. (65 m) Gasoline
150 ft. (45 m) Diesel F
150 ft. (45 m) JP5
100 ft. (30 m) Hydrogen
150 ft. (45 m) Kerosene
135 ft. (40 m) Ethanol
115 ft. (35 m) Methanol
135 ft. (40 m) IPA (Isopropyl Alcohol)
100 ft. (30 m) Methane*
100 ft. (30 m) LPG*
16 ft. (5 m) Polypropylene Pellets
33 ft. (10 m) Office Paper

*20” (0.5 m) high, 8” (0.2 m) with plume fire

Response Time Typically 5 seconds
Adjustable Time Delay Up to 30 seconds
Sensitive Range 4 Sensitive Ranges for 1 sq. ft. (0.1 sq. m) n-heptane pan fire from 50 ft. (15 m) to 215 ft. (65 m)
Field of View Gasoline: 67o horizontal, 70o vertical

Hydrogen: 80o horizontal, 80o vertical

Built-in-Test (BIT) Manual and Automatic
Temperature Range Operating: -67oF to 167oF (-55oC to 75oC)

Operating Option: -67oF to 185oF (-55oC to 85oC)

Storage: -67oF to 187oF (-55oC to 85oC)

Humidity Up to 95% non-condensing (withstands up to 100% RH for short periods)
Heated Options To eliminate condensation and icing on the window
Electrical Specifications Operating Voltage: 24 VDC nominal (18-32 VDC)

Power Consumption:

  • Standby: Max. 90 mA (110 mA with heated window)
  • Alarm: Max. 130 mA (160 mA with heated window)

Cable Entries: 2 x ¾” – 14 NPT conduits or 2 x M25 x 1.5 mm ISO

Wiring: 12 – 22 AWG (2.5 mm 2 – 0.3mm2)

Electrical Input Protection: According to MIL-STD-1275B

Electromagnetic Compatibility: EMI/RFI protected to EN61326-3 and EN61000-6-3

Electrical Interface: The detector includes twelve (12) terminals with five (5) wiring options (factory set)

Outputs Relays:

  • Alarm, Fault, and Auxiliary
  • SPST volt-free contacts rated 5A at 30 VDC or 250 VAC

4-20 mA (stepped)


  • Sink (source option) configuration
  • Fault: 0 + 1 mA
  • Warning: 16 mA +/- 5%
  • BIT Fault: 2 mA +/- 10%
  • Alarm: 20 mA +/- 5%
  • Normal: 4 mA +/- 10%§ Resistance Loop: 100-600 ohms

HART Protocol: Optional HART communication on the 0-20 mA analog current (FSK) – used for maintenance, configuration changes and asset management, available in mA source output wiring options RS-485: RS-485 Modbus compatible communication link that can be used in computer control installations

Mechanical Specifications Materials/Enclosure Options: Heavy-duty copper free aluminum (less than 1%), red epoxy enamel finish (ATEX Approval only)

Stainless Steel 316L with electro polish finish (FM or ATEX Approval)

Mounting: Stainless Steel 316L with electro polish finish


  • Detector: 4” x 4.6” x 6.18” (101.6 x 117 x 157 mm)


  • Aluminum: 2.8 lb. (1.3 Kg)
  • Stainless Steel 316L: 6.1 lb. (2.8 Kg)
  • Tilt Mount: 2.2 lb. (1.0 Kg)

Environmental Standards: Meets MIL-STD-810C for Humidity, Salt & Fog, Vibration, Mechanical Shock , High Temp, Low Temp

Water and Dust: IP66 and IP67 per En60529, NEMA 250 6P

Approvals Hazardous Area

  • ATEX & IECEx

    Ex II 2 GD
    Ex de IIB + H2 T5 (-55o to 75oC)
    Ex de IIB + H2 T4 (-55o to 85oC)
    Ex tD A21 IP66/X7 T 95oC
    Ex tD A21 IP66/X7 T 105oC

  • FM/CSA

    Class I Div. 1, Groups, B, C & D
    Class II/III Div. 1, Groups E, F & G


  • EN54-10 (LPCB)
  • FM-3260 (FM)


  • IEC61508 – SIL-2 (TUV)
  • PDO Approval: Petroleum Development Oman Certificate of Registration
  • ISO 9001:2008: Registered Quality System
Accessories Fire Simulator: 20/20-310

Tilt Mount: 3600-01

Weather Protector: 777163

Air Shield: 777650

Mini Laptop Kit: 777820

USB RS-485 Harness Kit: 794079-5

Laser Pointer (Detector Area Coverage): 777166


Electrochemical Toxic Gas Sensor Module 5100-XX-IT

Electrochemical Toxic Gas Sensor Module 5100-XX-IT

Sierra Monitor’s fixed 5100-XX-IT gas module monitors toxic gases such as Hydrogen Sulfide (H2S), Carbon Monoxide (CO), Nitrogen Dioxide (NO2), Ammonia (NH3), Oxygen (O2) Deficiency, and others.

The 5100-XX-IT module is based on electrochemical technology, a proven, less-expensive option that offers high accuracy, low power requirements, and sensitivity to a particular gas in the parts-per-million range.

The proven 5100-XX-IT fixed gas sensor module requires calibration only every six months, cutting operating costs and time. As part of the Sentry IT “smart” detector line, the module can be remotely diagnosed and calibrated via Remote Sensor Capability, a valuable asset for toxic gas monitoring. The 5100-XX-IT also offers a three or four wire 4-20mA analog output signal. By integration of IT modules into a Sentry system, the user gains the capability of system Modbus serial communications, extensive diagnostics features, WebServer interface, multiplexed sensor wiring, and field-proven reliability.

The Electrochemical Toxic Gas Sensor Module 5100-XX-IT is approved and certified by a variety of third party agencies, including FM, CE, CSA, SIL-2, ATEX, and IECEx. These approvals and certifications assure our customers that we carry only the highest quality of products and performance.


The 5100-XX-IT supports GlobalCal™, our unique global calibration feature of the Sentry IT Controller. This allows a single technician to calibrate connected detectors from the Sentry IT Controller. With GlobalCal, the calibration happens at the controller level. Multiple sensors can be connected to a single controller, allowing groups of sensors to be calibrated at the same time. Standard gas is applied remotely, using permanently installed tubing, rather than direct delivery to the fixed gas detector.

Combined with the six-month calibration interval, GlobalCal reduces labor costs associated with calibration. The need to shut down active process areas for calibration consequently costs facilities thousands of dollars in lost production time. GlobalCal, with its remote and non-intrusive methods, allows production to continue during the calibration process, thus avoiding the costs of lost production. In addition, factory-authorized service technicians performing gas detector calibration save time and costs by remotely calibrating all gas detectors at once from the Sentry IT Controller.

Integral LED Display

Easily calibrate and access gas concentrations, relay statuses, and diagnostics

Internal Continuous Self-Diagnostics

Automatically indicate any fault or optics problems

Menu-Driven System

Rapidly adjust user-friendly configuration of alarm setpoints, calibration, maintenance, and alarm acknowledgment

MODBUS RTU Interface

Provide an easy interface to the world’s most common industrial protocol interface

FM-Approved 6 Month Calibration Interval

Dramatically reduce maintenance time and half the costs as found on others for the user

SMC Sentry Digital Bus Interface

Connect easily with existing Sentry systems that have been in operation for many years

GlobalCalTM support

Non-intrusively calibrate all connected sensors at the same time without declassifying the area

Optional Remote Sensor Configuration

Access the controller over a remote network for convenience or for hard-to-access areas

Optically Isolated 4-20 mA Output

Interface effortlessly with common factory communication links and provide flexibility for the output

HART Interface

Effortlessly communicate over legacy 4-20 mA analog instrumentation wiring

Gas Type Model Std.Range(1) Opt. Max Range Resolution Response Time (2) Accuracy
Operating Range
°F °C RH*
Oxygen (O2) 5100-03-IT 5-25 % Vol 25% Vol 0.1% <10 sec. +/- 0.2%
-4 to 122 -20 to 50 15 – 99%
Carbon Monoxide (CO) 5100-04-IT 0-500PPM 1200 PPM 0.5 PPM <35 sec. +/- 1PPM
-4 to 122 -20 to 50 15 – 99%
Hydrogen Sulfide (H2S) 5100-05-IT 0-100PPM 100 PPM 0.1 PPM <35 sec. +/- 1PPM
-4 to 122 -20 to 50 15 – 99%
Chlorine (Cl2) 5100-06-IT 0-10PPM 10.0 PPM 0.1 PPM <60 sec. +/- 1PPM
-4 to 122 -20 to 50 15 – 99%
Chlorine Dioxide (ClO2) 5100-08-IT 0-3PPM 3.0 PPM 0.1 PPM <60 sec. +/- 1PPM
-4 to 122 -20 to 50 15 – 99%
Sulfur Dioxide (SO2) 5100-10-IT 0-100PPM 100 PPM 0.5 PPM <20 sec. +/- 1PPM
-4 to 122 -20 to 50 15 – 99%
Nitrogen Dioxide (NO2) 5100-12-IT 0-20PPM 20.0 PPM 0.2 PPM <35 sec. +/- 1PPM
-4 to 122 -20 to 50 15 – 99%
Hydrogen Dioxide (H2O2) 5100-21-IT 0-20PPM 20.0 PPM 0.1 PPM <100 sec. +/- 1PPM
-4 to 122 -20 to 50 15 – 99%
Ammonia (NH3) 5100-25-IT 0-100PPM 100 PPM 1.0 PPM <30sec. +/- 1PPM
-4 to 122 -20 to 50 15 – 99%
Hydrogen Fluoride (HF) 5100-26-IT 0-10PPM 10 PPM 0.5 PPM <30 sec. +/- 1PPM
-4 to 122 -20 to 50 15 – 99%
Ethylene Oxide (ETO) 5100-27-IT 0-20PPM 0-20PPM 0.1 PPM <90 sec. +/- 1PPM
-4 to 122 -20 to 50 15 – 99%
1. Optional ranges available *= Non-Condensing
2. Response time to 90% full signal value for applied concentration
Sensor Type Electrochemical
Performance Range:

  • Default range as above
  • User selectable alternative ranges Sensor Life: Typically >2 years

Sensor Life: Typically >2 years

Output Display: Fixed and scrolling LED

Signal Outputs:

  • Sentry digital bus
  • Analog 4-20mA
    • 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 @ 30 VDC (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

Power Power consumption: 2 watts maximum

Input voltage: 24 VDC nominal: 10-30 VDC

Remote Sensor Option 5100-03-IT: 10 feet

5100-04-IT: 15 feet

5100-05-IT: 15 feet

Built-in-Test (BIT) Manual and Automatic
Construction Dimensions: (H x W x D) (differs for 5100-25-IT & 5100-26-IT)

  • A1 & A2: 7.9 x 5.7 x 3.9 in. (20.1 x 14.5 x 9.9 cm)
  • S1 & S2: 7.6 x 4.4 x 4.9 in. (19.3 x 11.2 x 12.4 cm)


  • A1 & A2: 3.4 lb. (1.5 Kg)
  • S1 & S2: 7.2 lb. (3.3 Kg)

Housing: Epoxy-coated, die-cast, copper-free aluminum or 316 stainless steel


  • Explosion proof, Class 1, Div. 1, Groups B, C, D
  • Group IIB + H2 IP66, IP65, NEMA 4X

Warranty: 2 years

Approvals FM, CSA: For enclosure in hazardous locations

FM Performance Approval (5100-05-IT)

SIL-2 Certified (5100-04-IT, -05, -06-IT)

ATEX Certified II 2 G Ex d IIB+H2 T6 Gb

  • Ta = -20oC to 50oC (5100-05-IT)

IECEx Certified (5100-05-IT)

CE Mark (5100-05-IT)

ABS (5100-05-IT)

CQST Certified for China (5100-03, -04, -05-IT)

CCOE/PESO Certified for India

How to calibrate Sentry IT Gas Sensors with GLobalCal

Sentry IT fire and Gas Detection Solutions