Đầu báo khói quang học loại thường Ves VF2042

Mô tả sản phẩm Đầu báo khói quang học loại thường Ves VF2042

The VF2042, VF2043, and VF2044 photoelectric smoke detector(s) utilizes one bi-colored LED for indication of status. In a normal standby condition the LED flash Green every 3 seconds. When the detector senses that its sensitivity has drifted outside the UL listed sensitivity window the LED will flash Red every 3 seconds. When the detector senses smoke and goes into alarm the status LED will latch on Red.
The detector utilizes an infrared LED light source and silicon photo diode receiving element in the smoke chamber. In a normal standby condition, the receiving element receives no light from the pulsing LED light source. In the event of a fire, smoke enters the detector smoke chamber and light is reflected from the smoke particles to the receiving element. The light received is converted into an electronic signal.
Fire Judgment signals are processed and compared to a reference level, and when five consecutive signals exceeding the reference level are received within a specified period of time, the time delay circuit triggers the SCR switch to activate the alarm signal. The status LED light continuously during the alarm period.

Standard Features

• UL Listed
• Computer-designed non-directional smoke chamber
• 360° view of detector status LED
•  Low profile, 2” high (with base)
• 2 wire base compatibility.
• Highly stable operation, RF/Transient protection
• Low standby current, 59µA at 24VDC
• One built-in power/sensitivity supervision/alarm LED
• Automatic Sensitivity window verification function meets outlined requirements in NFPA 72, Chapter 2 and 7, Inspection, Testing and Maintenance

Ordering Codes