JDHW-1 (through-beam type) explosion-proof infrared beam smoke detector

 1. Overview of JDHW-1 (through-beam) explosion-proof infrared beam smoke detector

JDHW-1 (opposite beam) explosion-proof infrared beam smoke detector (referred to as detector) is a linear smoke detector, which is suitable for installation at both ends of the protection space and alarms for a certain concentration of smoke. This product can be used in places where smoke appears before a fire is formed, especially suitable for places with large spaces, high shelves, and long distances. More sensitive to black smoke. This product can be used together with fire alarm controllers from any manufacturer at home and abroad. It meets the requirements of GB3836 series standards.

The detector consists of a transmitter and receiver paired. The infrared beam emitted by the transmitter passes through the protected space and reaches the receiver. The smoke generated by the burning of the substance diffuses to the beam area, which weakens the radiation flux received by the receiver. When the radiation flux weakens to the predetermined smoke sensing action threshold, the receiver The output fire alarm information is transmitted to the fire alarm controller. The receiver of the detector is provided with six indicator lights indicating the strength of the signal, which is convenient for engineering debugging.
2. Working principle of JDHW-1 (opposite beam) explosion-proof infrared beam smoke detector

1. JDHW-1 explosion-proof infrared beam smoke detector is a linear smoke detector. The infrared beam emitted by the transmitter passes through the protected space and reaches the receiver. The smoke generated by the burning of the substance diffuses into the beam area, making the receiver The received radiant flux weakens, and when the radiant flux weakens to the preset smoke sensing action threshold, the receiver outputs fire alarm information and transmits it to the fire alarm controller.

2. There is an infrared light-emitting diode in the transmitter, which emits infrared light intermittently. Through the double-convex lens, an approximately parallel infrared beam is formed, which is received by the photosensitive diode in the receiver and converted into an electrical signal. After amplification and detection, it becomes a DC voltage. The magnitude of this DC level simulates the magnitude of the radiation flux of the infrared beam.

3. When a certain concentration of smoke enters the beam area and the DC level in the receiver drops to the action threshold, the signal line outputs a fire alarm signal, and the red confirmation light on the receiver lights up.

4. During use, if the detector window accumulates dust and other particles, the radiation flux of the infrared beam reaching the receiver will be weakened. In order to ensure that the smoke detection threshold of the detector is not affected, the detector uses hardware to perform initial value drift Automatic compensation so that dust etc. that build up slowly over a long period of time will not cause false alarms.

5. During debugging, if the transmitter and receiver are not aligned, the receiver receives a very small optical signal and outputs a fault signal. When entering the normal monitoring state, if the detector is completely blocked, the receiver first outputs a fault signal about 10 seconds later Output fire alarm signal.

6. There are six indicator lights on the receiver to indicate the strength of the signal, which is convenient for engineering debugging.
3. Technical features of JDHW-1 (opposite beam) explosion-proof infrared beam smoke detector
Explosion-proof mark Exd (ib) Ⅱ CT6
Working voltage DC15V～DC28V
Monitoring current ≤12mA
Action current ≤22mA
Detector status indication

Debug status: The green and yellow lights are solid or flashing in a specific pattern

Normal monitoring status: the red indicator light flashes periodically

Fire alarm status: the red indicator light is always on, and the yellow indicator light is off

Fault status: the yellow indicator light is always on, the yellow indicator light is always on, the detector reports a fire alarm after 20 seconds, and the controller lights up the red indicator light and turns off the yellow indicator light

The optical path is completely blocked: the detector reports a fault first and is always on
Protection area Maximum protection area 14×100=1400㎡, maximum width 14m
Detection distance 3~100(m)
use environment

Temperature: -20℃～+50℃

Relative humidity: ≤95% non-condensing
Atmospheric pressure 80kPa～110kPa
Inlet diameter 2-M22×1.5 (the number and size of the inlet diameter can be designed and produced according to the needs of users)
Dimensions 197×195×116 (mm)
color: red
Weight transmitter 2.5kg; receiver 2.6kg