Main technical indicators 

Detection principle: Optics + Semiconductor 

Detection of gas: smoke 

Sampling method: natural diffusion; 

Alarm method: relay output, sound and light alarm (optional); 

Response time: <10s Response time: <10s; 

Ambient temperature: -40℃~70℃; 

Relative humidity: <95%; 

Explosion-proof method: explosion-proof type; 

Explosion-proof grade: ExdⅡCT6; 

Power supply: DC24V±25%; 

Switch quantity: 2 

Power consumption: ≤3W;

Wiring instructions

Output description 

The device has no communication function externally and outputs as a logic switch signal. There is no data display function, and the motherboard has a status display indicator light. However, when the smoke concentration reaches the equipment judgment conditions, the main board indicator light is on, the relay is closed, the alarm node is turned on, and a 20ma current signal is output to the outside, which means that smoke is detected. When the smoke concentration judgment condition is lower than the smoke concentration, the motherboard indicator light goes out, the relay and the alarm contact are disconnected, and a 4ma current signal is output to the outside, which means there is no smoke. It is necessary to note that the device status is not maintained, and it is in a real-time test state. If there is smoke, the motherboard indicator light will light up, the relay will be closed, the alarm node will be turned on, and a 20ma current signal will be output to the outside. On the contrary, if there is no smoke, the motherboard indicator light will immediately turn off, the relay and the alarm contact will be disconnected, and a 4ma current signal will be output to the outside.

Note: When the motherboard indicator light and relay flash, it is generally caused by the smoke floating disturbance detected by the light detection sensor, especially when the actual smoke concentration value is around the internal judgment conditions of the instrument. 

Sensitivity adjustment 

Sensitivity adjustment: (Sensitivity adjustment terminal) Jumper cap 2-4-bit adjustment semiconductor sensor, 5-7-bit adjustment optical sensor. Short-circuit jumper 1 bit to turn off the semiconductor sensor, and the device only detects smoke through an optical sensor. Short-circuit jumper 8 bits can turn off the optical sensor, and only the semiconductor sensor can detect smoke. Shorting of either bit will not turn off the actual function of the corresponding sensor, it is just a turn off on the logical judgment. Both 2-4 bits (corresponding to semiconductor sensor) and 5-7 bits (corresponding to optical sensor) are binary coded, and the corresponding bits are shorted to 0 and not shorted to 1. For example, shorting 2 and 4 bits, the corresponding binary bit 010 is, 2 in decimal. If you want to adjust the sensitivity to the 5th level, shorting 3 bits. At this time, the corresponding binary bit 101 is, 5 in decimal.

Both sensors have 7 levels to adjust (the encoding level is shorted by shorting the corresponding bits), and Level 1 is the most sensitive, and the larger the encoding number, the lower the sensitivity. 

The sensitivity has been adjusted from the factory, so users should try not to adjust it themselves as much as possible. In practical applications, users can short-circuit 1 or 8 bits to determine the operation of the sensor.