Infrared detector installation basics

Installation method

1 Pillar-type installation: The more popular pillars are round and square, and the more popular ones are round pillars. The current situation is exactly the opposite. Square pillars are becoming more and more popular in the engineering world. The main reason is that the detector is mounted on a square pillar without rotation and is not easy to move. In addition to this, there is a wide range of stainless steel, alloy, and aluminum alloy profiles to choose from. Another type of practice is to use angle steel as a pillar. If it is not guaranteed that the track can effectively penetrate the dark deposit and the line is exposed in the air, this method is not acceptable.

The shape of the pillars can be "1" shape, "Z" shape or curved, depending on the characteristics of the building and anti-theft requirements. The key point is that the fixing of the pillars must be firm and firm without shifting or shaking to facilitate installation and Fortification, reduce false positives. ;

2 Wall-mounted installation: Now the leading manufacturer of active infrared detectors in the anti-theft market, can provide infrared detectors with 180° omni-directional angles and pitch angles above 20°, such as ALEPH active infrared detectors HA, ABT, ABF series products can support the direct installation of probes on the outer walls or walls or fences of buildings.

Installation point

1. Lines must not be applied in a definite way, and must be hidden. This is the minimum requirement for the safety of the detectors.

2. For a detector mounted on a wall, the maximum horizontal distance of the ray from the wall edge should not be greater than 30M. This requires special attention when the wall is curved in an arc.

3. After the wiring is connected, please use the resistance of the multimeter to test the power supply terminals 1 and 2 of the probe to confirm that there is no short circuit fault before turning on the power supply for debugging.

Engineering commissioning

(A) Optical axis adjustment of the projector

Open the cover of the probe and align the eye with the sight. Observe the situation inside the sight. The optical lens of the probe can be adjusted by hand in the range of 180°. Use a screwdriver to adjust the upper and lower adjustment screws under the lens. The lens system has up and down The adjustment range of 12° is repeatedly adjusted so that the impact of the opponent detector in the sight falls into the central position.

Take care not to cover the optical axis during adjustment so as not to affect the adjustment work.

The adjustment of the optical axis of the projector has a great influence on the sensitivity performance of the zone. Please make sure to follow the correct steps carefully and repeatedly.

(B) Receiver optical axis adjustment

The first step: The initial adjustment of the optical axis of the photoreceptor is performed in the same manner as "optical axis adjustment of the projector". At this point, the red warning light on the receiver is extinguished, the green indicator light is on, and there is no flickering phenomenon, indicating that the optical axis of the cover head coincides normally, and the function of the light projector and the light receiver is normal.

The second step: There are two small holes in the receiver, marked with "+" and "-", respectively, used to test the infrared sensor feel the intensity, the value expressed by the voltage, known as the photosensitive voltage. Insert the multimeter's test leads (red "+", black "-") into the photoreceptor's photo-sensing voltage. Repeatedly adjusting the lens system maximizes the exposure voltage. In this way, the working state of the probe reaches the best state.

Note: The four-beam detector has two sets of optical systems, which need to cover the upper and lower lenses of the receiver, respectively, and adjust the upper and lower exposure voltage values ​​to be the same. Older four-beam detectors The two groups of optical systems are separately adjusted. Since the relationship between the four optical systems of the two transmitters, the transmitter and the receiver, is involved, it is difficult to adjust them. It requires careful adjustment and improper handling. There is a false alarm or protection of the dead zone. The ABF four-beam detector has integrated the two parts into an integrated regulation, making it easier to construct the project.

(c) Adjustment of shading time

The light-receiving device is provided with a light-shielding time adjustment button. Generally, the light-shielding time of the probe is adjustable between 50 m/s and 500 m/s. When the probe is shipped from the factory, the light-shielding time of the probe is adjusted to a standard position. Next, this location is a relatively modest state, both taking into account the environmental conditions and the characteristics of the probe itself, so there is no special reason, and there is no need to adjust the shading time. If you need to adjust the shading time due to the fortification, to adapt to changes in the environment. In general, the shading time is short and the sensitivity of the probe is fast, but it is also sensitive to falling leaves, flying birds, and the like, and the possibility of false alarms increases. Long shading time reduces the sensitivity of the probe and increases the probability of missed reports. The engineer should adjust the shading time according to the actual needs of the fortification.