FM Approved four-band UV+IR flame detector (IR3+UV) for hydrocarbon and hydrogen fires. 50 m range, <1 s fastest alarm, 4–20 mA, RS-485/Modbus, HART.
The F750/UVIR3 is a multi-spectral UV+IR flame detector designed to detect both hydrocarbon and non-hydrocarbon flames, including hydrogen. It uses a narrow-band current-mode pyroelectric IR sensor tailored for hydrogen characteristics plus a high-performance UV phototube, combined with a 32-bit MCU and dedicated hydrogen signal-processing algorithms. This architecture delivers fast response, wide detection coverage, and strong immunity to common false-alarm sources (sunlight, artificial lighting, welding, lightning, blackbody radiation), enabling reliable protection in challenging indoor/outdoor environments
UV+IR (IR3+UV) four-band design: Detects hydrocarbon and hydrogen flames with strong anti-interference performance
Ultra-fast response: fastest alarm time < 1 s (application dependent); typical n-heptane response ≤ 10 s at rated distance
Long range: effective alarm distance up to 50 m (1 ft² n-heptane)
Outputs: Alarm/Fault/Aux relays, 4–20 mA, RS-485 (Modbus); HART supported
Configurable sensitivity levels; Optical Integrity (OI) auto-test
Robust compliance: EMC performance beyond GB requirements; meets SIL3 requirements
| Fuel / Fire Source | Fire Size / Conditions | High Sensitivity | Low Sensitivity |
|---|---|---|---|
| n-Heptane | 0.3 m × 0.3 m (1 ft × 1 ft) pan fire | 50 m (164 ft) | 30 m (98 ft) |
| Alcohol | 0.3 m × 0.3 m (1 ft × 1 ft) pan fire | 40 m (131 ft) | 25 m (82 ft) |
| Hydrogen | 70 cm flame height / 6 mm orifice / 40 SLPM | 20 m (66 ft) | 10 m (33 ft) |
| Item | Specification |
|---|---|
| Spectral Response | 185–260 nm (UV), 2.7–5.0 μm (IR) |
| Response Time (n-Heptane) | ≤ 10 s (at rated distance) |
| Fastest Alarm Time | < 1 s (application dependent) |
| Field of View (FOV) | 90° (standard sensitivity), 120° (Fast-Alarm mode) |
| Optical Integrity (OI) Check | Supported (automatic OI test) |
| Compliance (GB standards) | GB 15631-2008, GB 12791-2006, GB 3836 |
| Explosion Protection | Ex db IIC T6 Gb / Ex tb IIIC T80°C Db |
| Ingress Protection | IP66 / IP67 |
| Operating Temperature | -40°C to +70°C (-40°F to +185°F) |
| Storage Temperature | -40°C to +85°C (-40°F to +185°F) |
| Humidity | 0–96% RH (non-condensing); briefly withstands 100% condensing humidity |
| EMC – Radiated RF Immunity (RS) | 10 V/m, 80–3000 MHz |
| EMC – ESD Immunity | Air: 8 kV; Contact: 6 kV |
| EMC – Surge Immunity | Line-to-Ground: 1 × (1 ± 0.1) kV; Line-to-Line: 1 × (1 ± 0.1) kV |
| Relays | Alarm / Fault / Auxiliary |
| Analog Output (Current Loop) | 0–20 mA: Fault ≤ 1 mA; OI Fault 2 mA; Normal 4 mA; Alarm 20 mA |
| Digital Communication | RS-485 (Modbus); HART |
| Nominal Supply Voltage | 24 VDC (range 18–32 VDC) |
| Power Consumption / Current | ≤ 65 mA |
| Reset Method | Power-cycle or via communication protocol |
| Housing Material | Aluminum alloy (ADC12) |
| Cable / Conduit Entries | 2 × NPT 3/4" |
| Dimensions (L × W × H) | 141 × 121 × 118.5 mm |
| Weight | 1.3 kg |
| Included / Optional Accessories | Cast-aluminum mounting bracket, sun/rain shield, blocking plug(s), protective guard |
| Event Records | Detector event log and alarm data recording |
| Safety / Quality Certifications | FM, Type Test, CCC (3C), Explosion-proof, SIL3 (meets SIL3 standard) |
