HW-F335 Fire Alarm (RS-485 Protocol Supported)

I. Instructions for Use of Fire Alarm

The HW-F335 is a civilian fire alarm device. It uses a three-band sensing method combining infrared, ultraviolet, and thermal radiation, and employs the Curie temperature of lithium tantalum crystal material. It is suitable for flame temperatures ranging from 250-4000℃ and provides a clear high-contrast polarity change for fire early warning. The detector has stable performance and can quickly detect and trigger an alarm within 5-10 seconds when a fire occurs. The product can be set up by scanning a QR code with a mobile phone and is used for various open flame detection fire early warning applications, including fire alarms, security alarms, industrial plants, mining areas, chemical combustible material alarms, residential homes, charging piles, gas stations, chargers, equipment, and more.

II.  Setup Instructions

1.Power supply via RS-8 twisted-pair cable, ceiling-mounted detection method in fire escape passages.

2.Multi-channel output: 485A · 485B · high-level fire alarm signal · dry contact relay output for fire alarm.

3.Enclosed in a metal housing.

4.Highly sensitive outdoor fire detection, open for secondary development.

5.Wide range of applications, especially suitable for outdoor scenarios.

6.Immunity to electromagnetic radiation, sunlight, and background thermal radiation.

7.Passive operation, low power consumption, multi-layer protection, and ultra-long service life design.

The fire alarm detection time is as follows: when the triggering conditions are met, the fire will continue to output a trigger signal as long as the fire is extinguished, indicated by a constantly lit red LED. When the flame disappears, the flame sensor source will reset in approximately 5 seconds, returning to sentinel detection mode. This detection time is determined when a fire occurs.

1. Avoid installation in areas with heavy steam/oil fume, such as kitchens and bathrooms, and keep away from air conditioning vents and dust accumulation areas to prevent false alarms.

2. Clean the optical sensor quarterly with a soft brush to prevent dust from obstructing detection accuracy.

3. Monthly check the audible and visual alarms and power connection by pressing the test button to ensure timely response in case of fire.