The D371 is a stand-alone fire & flame detector in a watertight NEMA 4X (IP66/67) and explosion-proof Stainless Steel enclosure designed for indoor/outdoor Class I, Div. 1 (Zone 1) installations. The detector features an automatic self-test for continuously checking the detector’s optical path integrity while monitoring the electronics to ensure utmost reliable operation and fault reporting.Â
The D371 3IR +UV Multi-Spectrum Fire & Flame Detector (Patent pending) represents a new generation of optical fire & flame detector designed and optimized to respond to both the Hydrocarbon and Non-Hydrocarbon based fires while rejecting False Alarm Sources. The Protector D371 senses UV radiation in the Ultraviolet spectrum and Infrared radiation in 3 discrete bands of IR Spectrum for detecting fires.Â
Flame response and false source rejection for the detector is accomplished by utilizing the Convolution Method and Advanced DSP (Digital Signal Processing).
| Response Time | Detects fires in 3–5 seconds for rapid alerts and minimized risk. |
| Multi-Spectrum Detection | 3 IR + UV design detects hydrocarbon, non-hydrocarbon, and hydrogen fires with high false alarm immunity. |
| Outputs | Alarm, fault, and auxiliary relays; 4–20 mA analog output; RS485 Modbus®. |
| Event Logging | Stores 200 events and 6 FireGraphs® for tracking and analysis. |
| Adjustable Sensitivity | Multiple selectable sensitivity levels for varied operating environments. |
| Solar Blind & Heater | Solar blind technology with optional heater minimizes false alarms and prevents condensation or icing. |
| Automatic Self-Test | OptiRadar® technology continuously monitors circuitry and optical path integrity. |
| Enclosure | Copper-free aluminum or stainless steel housing with NEMA 4/4X (IP66/IP67) and explosion-proof options. |
| Installation | Pluggable connector and modular electronics simplify installation and maintenance. |
| Warranty | Made in the USA with a 3-Year Warranty. |
| General | |
|---|---|
| Field of View | 90° Horizontal and Vertical |
| Spectral Sensitivity | UV: 180–260 nm; IR: 2–5 µm (3 discrete bands) |
| Detection Range | 12 × 12 in n-Heptane fire: 200 ft (61 m); 36 in Hydrogen Plume: 100 ft (30.5 m) |
| Response Time | Typically 3–5 seconds |
| Electrical | |
|---|---|
| Operating Voltage | 24 VDC nominal (18–31 VDC), regulated |
| Standby Power | 60 mA @ 24 VDC |
| Alarm Power | 90 mA @ 24 VDC |
| Heater Option | 120 mA additional |
| Mechanical | |
|---|---|
| Enclosure | 316 Stainless Steel |
| Dimensions | 5.91 × 4.78 × 4.40 in (150 × 122 × 112 mm) |
| Weight | 10 lb (4.5 kg) |
| Mounting | Stainless steel swivel arm (order separately #DA-001), 6.6 lb (3 kg) |
| Conduit Entries | Standard: (2) M25; 1 × M25 × ¾ in NPT adapter included |
| Wiring | 12–22 AWG (3.3–0.33 mm²) |
| Environmental | |
|---|---|
| Operating Temperature | -40°F to +185°F (-40°C to +85°C); -55°F to +185°F (-48.3°C to +85°C) with heater option |
| Operating Humidity | 5–95% RH, non-condensing |
| Vibration | In compliance with FM 3260-2003; meets or exceeds MIL-STD 810C |
| Enclosure Type | NEMA 4 & 4X, IP66/IP67 |
| Relay Operations | |
|---|---|
| Output Relays | Alarm / Auxiliary / Fault; SPDT contacts rated 2 A @ 24 VDC. Alarm & Auxiliary programmable; Fault energized. |
| Adjustable Time / Verification Delay | Auxiliary Relay: 0.3, 3, 10, 20 seconds |
| Analog Output | 0–20 mA stepped source |
| Communication | RS-485 Modbus |
| Visual Indications | Green LED (Normal); Red LED (Alarm) |
| Airports & Aircraft Hangars |
| Warehouse & Storage Facilities |
| Manufacturing & Food Processing |
| Diesel Generators & Fuel Storage |
| Battery Rooms & Charging Facilities |
| Oil & Gas Facilities |
| Refineries & Cogeneration Plants |
| Chemical & Hydrogen Plants |
| Tank Farms |
| Compressor Stations |
| Paint Booths |
| Paint & Solvent Storage Facilities |
| Recycling Centers |
| LPG / LNG Facilities |
| Power Plants |
| Marine Fuel Loading & Unloading |
| FM Approval | FM Approved (USA & Canada) |
| EMC / RFI Compliance | RFI & EMC compliant |
| SIL Rating | Designed to SIL 3 requirements |
| ATEX Certification | ATEX Certified |
| IEC / IECEx Certification | IEC / IECEx Certified |
| CE Marking | CE Marked |
| CSFM Listing | California State Fire Marshal (CSFM) Listing |
| Environmental Testing | Meets or exceeds MIL-STD 810C |
| Flame Detector Standard | In compliance with FM3260-2003 |
| DA-001 | 316 Stainless Steel Mounting Arm |
| DA-003 | Air Purge Kit |
| DA-005 | Weather Shield |
| DA-006 | Field of View Restrictor |
| DA-008 | Detector Key Test Station |
| HW-AM25-0001 | M25 Male to ¾ in Female Adapter, Stainless Steel |
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