D371 Flame Detector

EXPLOSION-PROOF MULTI-SPECTRUM FLAME DETECTOR

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.

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.

Flame response and false source rejection for the detector is accomplished by utilizing the Convolution Method and Advanced DSP (Digital Signal Processing).

PRODUCT FEATURES

Fast Response – Detects fires in just 3–5 seconds for rapid alerts and minimized risk.
Multi-Spectrum Detection – 3IR + UV design detects hydrocarbon, non-hydrocarbon, and hydrogen fires with high false alarm immunity.
Versatile Outputs – Alarm, fault, auxiliary relays, 4–20 mA, and RS485 ModBus® for seamless system integration.
Event Logging – Stores 200 events and 6 FireGraphs® for accurate tracking and analysis.
Adjustable Sensitivity – Multiple selectable levels ensure accurate detection in varied environments.
Solar Blind & Optional Heater – Reduces false alarms from sunlight and prevents condensation or icing.
Automatic Self-Test – OptiRadar® technology continuously checks circuitry and optical path integrity.
Durable Enclosure – Copper-free aluminum or stainless steel housing with NEMA 4/4X (IP66/67) and explosion-proof options.
Easy Installation – Pluggable connector and modular electronics module simplify field setup and maintenance.
Made in USA with 3-Year Warranty – Built to high standards for long-term reliability.

TECHNICAL SPECIFICATIONS

General

Field-of-View: 90° Horizontal and Vertical
Spectral Sensitivity: 180–260 nm (UV);
2–5 µm (IR) 3 discrete bands
Detection Range: 12 in × 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), 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 in × 4.78 in × 4.40 in
(150 mm × 122 mm × 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 × 3⁄4 in NPT adaptor 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 2 A, 24 VDC; Alarm & Auxiliary programmable; Fault energized.
Adjustable Time/Verification Delay:
Aux Relay 0.3, 3, 10, 20 s
Analog Output: 0–20 mA stepped, source
Communication: RS-485 Modbus
Visual Indications: Green/Normal; Red/Alarm

SAFETY APPLICATIONS