Vedard Security Alarm Technical Support

Should I use IR camera or full color camera? Let us explain IR camera and full color camera. IR camera has infrared LED for lighting compensation at night with weak light environment. Full color camera can display real color of the spot. But if the light is weak, the displayed picture quality will b...

If you accidentally drop soot, use your stove improperly, or use an aging power cord, a big fire could be brewing while you're sleeping or doing something else. People can not always pay much attention on what they do. So, a big fire always happen at that way. The safety of home life is something we...

With new technology AI and IOT, many normal home security devices are upgraded to smart security device. For example, normal smoke alarm is upgraded to NB-IOT smart smoke alarm, normal security camera is upgraded to face-recognized camera and tracking camera, normal motion sensor PIR is changed to Z...

To avoid false alarm triggered by animals such as dog, cat, the intrusion detectors are always designed with pet immunity. New technology such as AI analysis is adopted for pet immunity. Correct installation is important to avoid false alarm triggered by animals. For example, there are some principl...

1. The meaning of %LEL concentration in the measurement range of gas alarm %LEL refers to the lower limit of explosion. The lowest concentration of combustible gas that will explode when it encounters an open fire in a confined space. In the case of methane, the lower limit of explosion European sta...

For the way of closed doors and Windows and then burning coal stove to heat, it is very easy to produce carbon monoxide, resulting in human poisoning and death. What are the conditions that can cause carbon monoxide poisoning indoors in winter? 1. The indoor air is closed in winter, and when the coa...

The active infrared detector consists of an infrared transmitter and an infrared receiver.An infrared transmitter sends one or more modulated infrared rays to an infrared receiver.When there is no shield between the transmitter and receiver, the detector will not alarm.When there is an object blocki...

Passive infrared detector has two key components, one is the Fresnel lens, the other is the pyroelectric sensor.In nature, any object above the absolute temperature (-273°) will produce infrared radiation, and objects at different temperatures emit infrared energy at different wavelengths.The body h...

A detector that combines two pyroelectric sensors with the same performance but opposite polarity is a dual detector.

In general, the human body temperature is always much higher than the ambient temperature.When the intruder moves, the sensor receives the infrared change signal amplitude is large and triggers the alarm.When the ambient temperature rises to close to the temperature of the human body, the infrared c...