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 |
| DG-500 Flame Simulator | UV + 3IR Flame Detector Calibration Lamp |
Looking for dependable gas detection and control solutions at the right price, without the long wait? Conspec offers industry-leading turnaround times and competitive pricing on all of our safety solutions. Please share some information about your project and a member of our team will respond at their earliest convenience.
"*" indicates required fields
1Source Control Products is an oilfield equipment and industrial supply distributor serving energy producers and service companies throughout Oklahoma and the Texas Panhandle. Specializing in valves, regulators, process controls, and essential oilfield equipment, 1Source helps operators maintain safe, reliable production facilities. As a Conspec Controls partner, 1Source provides access to combustible and toxic gas detection equipment for wellheads, tank batteries, production facilities, and other oilfield applications. With local inventory, knowledgeable personnel, and a commitment to responsive customer service, 1Source is a convenient resource for operators seeking dependable gas monitoring solutions and oilfield supplies.
Automation-X is a supplier of industrial automation, electrical, and instrumentation products for oil and gas production facilities. Specializing in process control, remote monitoring, communication systems, and field automation, Automation-X helps energy operators maintain safe and efficient operations in demanding environments. Through its partnership with Conspec Controls, Automation-X offers gas and flame detection solutions for wellhead facilities, production sites, compressor stations, and other oil and gas applications. Its technical expertise, product sourcing capabilities, and customized control solutions make Automation-X a valuable resource for customers seeking reliable safety monitoring equipment.
Fuller Fire & Safety Equipment provides access to industrial flame detection and gas monitoring technologies that complement its fire protection capabilities, helping customers identify potential hazards and strengthen facility safety.
Healey Fire Protection specializes in engineered fire detection and suppression systems for industrial facilities and special hazard applications. With more than 60 years of experience, Healey provides customized solutions that integrate optical flame detection, combustible and toxic gas monitoring, and advanced fire suppression technologies. Through its partnership with Conspec Controls, Healey helps customers implement reliable fire and gas detection systems for manufacturing facilities, energy storage installations, power generation, and other high-risk industrial environments. Its expertise in system design, installation, commissioning, and maintenance makes Healey a valuable partner for protecting personnel, property, and critical operations from fire-related hazards.
ORR Protection is a leading provider of engineered fire protection solutions for industrial, commercial, and mission-critical facilities throughout North America. Specializing in fire and gas detection, special hazard suppression systems, and integrated fire safety technologies, ORR helps customers protect personnel, critical assets, and business operations. As a Conspec Controls partner, ORR provides access to advanced optical flame detection and combustible gas monitoring solutions for high-risk environments, including energy storage, power generation, manufacturing, and industrial processing facilities. Its extensive engineering, installation, and service capabilities make ORR an ideal partner for organizations seeking comprehensive fire prevention and industrial safety solutions.
Winn-Marion is a leading provider of industrial automation, instrumentation, and control solutions for the oil and gas industry. With expertise in upstream production, midstream operations, gas processing, and industrial system integration, Winn-Marion helps customers improve operational safety, reliability, and efficiency. As a Conspec Controls partner, Winn-Marion provides access to advanced combustible and toxic gas detection systems and industrial flame detection solutions that help protect personnel, equipment, and critical infrastructure. Its engineering capabilities, field services, and technical support make Winn-Marion an ideal partner for operators seeking integrated safety and automation solutions.
