Multi-IR Flame Detector 3976

Multi-IR Flame Detector - Model 3976

Our most advanced model, the 3976 multi-spectrum infrared (IR) flame detector is designed to detect unwanted fires and output appropriate alarm information. In a breakthrough technological advance, the model 3976 senses infrared radiation in up-to-five discreet infrared wavelengths for early fire detection.

The multi-spectrum sensor information, combined with the sophisticated algorithm, enables the model 3976 the ability to quickly detect hydrocarbon and non-hydrocarbon fueled fires. The model 3976 also features an automatic self-test function to monitor the detector’s ability to sense fires and report a fault condition when impaired.

Typical applications for the model 3976 are:

  • Refineries
  • Pipelines
  • Production platforms
  • Turbine enclosures
  • Power plants
  • Compressor stations
  • LNG/ LPG facilities
  • Tank farms
  • Hangars
  • Petrochemical plants

 

Multi IR Flame Detector
1. Superior Response Time 

Senses up-to-five discreet infrared wavelengths for early fire prevention

2. Robust false alarm immunity

Fire event analysis algorithm for industry-leading false‑alarm immunity

3. Fire Range Detection 

90° field of view and over 200ft long range detection

4. Advanced through-lens self-test

Automatic through-the-lens diagnostic self-test ensures consistent, reliable operation

5. Intelligent, thoughtful design

Crafted with decades of real-world experience to simplify the installation, commissioning, maintenance 

 
Model Number 3976
Spectral Response

Infrared peak sensitivities of 2.2 μm, 3.7 μm, 4.4 μm, 5.8 μm

Performance Ratings 

Normal sensitivity:

  • 1 sq. ft. gasoline fire at 75 ft. in <1 sec
  • 1 sq. ft. n-Heptane fire at 75 ft. in <1 sec

Enhanced sensitivity (Normal for 3976-1):

  • 1 sq. ft. gasoline fire at 100 ft. in <1 sec
  • 1 sq. ft. n-Heptane fire at 100 ft. in <1 sec

Long distance sensitivity:

  • 1 sq. ft. gasoline fire at 200 ft. in <1 sec
  • 1 sq. ft. n-Heptane fire at 200 ft. in <1 sec
  • 4 sq. ft. JP-5 fire at 200 ft. in <5 sec

Operating Temperature Range

-40℉ to 185℉ (-40℃ to 85℃)

Mechanical Specifications

Weight: 2.4 kg (5 lbs)

Height x width x depth: 114 x 140 x 125 mm (4.5 x 5.5 x 4.9 in)

Conduit entry: 3⁄4-14 NPT or M20-1.5

Detector Inputs

Inputs:

  • Nominal Voltage: 24 VDC (ripple voltage <204mV)
  • Range: 20 to 30 VDC 

Power consumption:

  • Standby: 80 mA
  • Alarm: 100mA
  • Auto and manual test: 160 mA

Detector Outputs

Relay:

  • Relays (2): fire, trouble, dry contacts, hermetically sealed 
  • Rated: 2 A at 28 VDC. User selectable NO or NC
  • Fire relay: user selectable latching or non-latching 

Environmental Ratings

Class I, Division 1, Groups B, C & D (explosion proof)
Class II, Division 1, Groups E, F & G (dust ignition proof)
Type 4X weatherproof, dust-tight, watertight
CE0081 II 2 G/D
Ex db IIB+H2 T5 Gb for gas
Ex tb IIIC T100°C Db IP66 for dust

Accessories:

Part No. - Description:

3900-01 - SS Tilt mount for Aluminum Enclosures
3900-02 - SS tilt mount for Stainless Steel Enclosures
3900-03 - Air Shield 
3900-05 - SS Sun Shade/Rain Guard
3900-07 - Universal Tester 
3900-08 - Battery Pack for tester # 3900-06, 3900-07
3900-09 - Charger for tester # 3900-06,3900-07
3900-14 - 2" Pole Mount kit for # 3900-01 bracket
3900-15 - 2" Pole Mount kit for # 3900-02 bracket

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.