Triple IR Flame Detector 3600-I

Sierra Monitor’s 3600-I flame detector monitors hydrocarbon-based fuel and gas fires at long distances with the highest immunity to false alarms.

Triple IR Flame Detector 3600-I

The 3600-I 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-I utilizes a Triple Spectrum Design, which allows it to detect fires up to 215 feet away. The 3600-I can detect a 1 sq. foot gasoline pan at 215 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. Due to increased reliability, the 3600-I is approved to IEC 61508 Safety Integrity requirements of SIL-2 (TUV).

The Triple IR Flame Detector 3600-I 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.

triple ir flame detector
1. Triple Spectrum Design

Detect flames up to 215 feet away

2. IR Sensitivity Selection

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

3. 5-Second Response

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

4. Heated Window

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

5. Low Power Requirements

Save energy costs while protecting the facility

6. Multiple Output Options (Relay Outputs, 0-20 mA, HART, Modbus RS-485)

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

Model Number


Spectral Response

Three 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 Fuel
150 ft. (45 m JP5
150 ft. (45 m Kerosene
135 ft. (40 m Ethanol 95%
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

Input Voltage

Typically 5 seconds

Adjustable Time Delay

Up to 30 seconds

Sensitive Range

2 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

100o horizontal, 95o vertical

Built-in-Test (BIT)

Manual and Automatic

Alarm Relay

3200/3300: 1.0 amp @ 30 VDC resistive

Temperature Range

Operating: -67oF to 167oF (-55oC to 75oC)

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

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


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 mm2 - 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)



  • 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


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)
  • DNV Marine Approval


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

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

Sentry IT Fire and Gas Detection Solutions

A brief introduction to the sales, design and manufacturing facilities for Sierra Monitor Corporation's Sentry IT fire and gas solutions.