Intrinsic safe ATEX certifiedPIR detectors are devices that use passive infrared (PIR) technology to detect motion in potentially explosive areas. They are designed and manufactured to ensure that they do not produce sparks or heat that could ignite a flammable atmosphere. In this article, we will explain what intrinsic safe PIR detectors are, how they work, and what benefits they offer for anti-burglary protection and lighting control in EX zones.

What are intrinsic safe PIR sensors?

PIR detectors are sensors that measure the infrared radiation emitted by objects in their field of view. They can detect the presence and movement of people, animals, and vehicles by comparing the changes in the infrared levels. PIR detectors are widely used for security and automation purposes, such as triggering alarms, cameras, lights, or doors.

However, not all PIR detectors are suitable for use in hazardous environments, such as oil and gas plants, chemical factories, mines, or silos. These environments contain flammable gases, vapors, dust, or fibers that could explode if exposed to a source of ignition. Therefore, PIR detectors that operate in these areas must be intrinsically safe, meaning that they cannot generate enough electrical or thermal energy to cause a fire or an explosion.

Intrinsic safe PIR detectors are certified by international standards, such as ATEX and IECEx, to ensure that they comply with the safety requirements for different zones, gas groups, and temperature classes. These standards define the maximum voltage, current, power, capacitance, and inductance that the PIR detectors can have in order to prevent ignition.

How do EX PIR detectors work?

Intrinsic safe PIR detectors work in a similar way as regular PIR detectors, but they have some additional features and components that make them safe for hazardous areas. These include:

Intrinsically safe power supply: This is a device that limits the voltage and current that reaches the PIR detector, ensuring that it stays below the ignition threshold. The power supply can be either a zener or a galvanic barrier, depending on the type of PIR detector and the zone classification.

Intrinsically safe relay separator: This is a device that isolates the alarm and tamper signals from the PIR detector, preventing any electrical feedback or interference from the safe area. The relay separator can be either a single-channel or a two-channel device, depending on the number of outputs that the PIR detector has.

Explosion-proof housing: This is a metal enclosure that protects the PIR detector from mechanical damage and environmental factors, such as dust, water, or corrosion. The housing also prevents any sparks or flames from escaping the PIR detector in case of a fault. The housing must have an IP rating that indicates the level of protection against ingress of solids and liquids.

What are the benefits of intrinsic safe PIR detectors?

Intrinsic safe PIR detectors offer several advantages for applications that require motion detection in potentially explosive areas. Some of these benefits are:

Reliability: Intrinsic safe PIR detectors are designed and tested to ensure that they function properly and safely in harsh and hazardous conditions. They have a low current consumption and a long service life, reducing the need for maintenance and replacement.

Accuracy: Intrinsic safe PIR detectors use advanced signal processing and optical systems to discriminate between real motion and false triggers, such as sunlight, reflections, or temperature changes. They can also adjust their sensitivity and detection range according to the environment and the application.

Versatility: Intrinsic safe PIR detectors can be used for various purposes, such as anti-burglary protection, lighting control, or perimeter security. They can be integrated with other intrinsically safe devices, such as cameras, sirens, or switches, to create a comprehensive and customized solution.

Where can you find ATEX certfied PIR detectors?

If you are looking for high-quality and certified intrinsic safe PIR detectors, you can visit the website of Atex certified1, a company that specializes in providing anti-burglary protection and lighting control solutions for EX zones. Atex certified offers a range of intrinsically safe PIR detectors, such as:

VW33430 Ex: This is a dual PIR + MW detector that uses both infrared and microwave technologies to detect motion. It has a detection range of 15 x 15 m and a 90-degree angle. It is suitable for zone 1 and 2 and gas group IIB.

MMVTAM12 Ex: This is another dual PIR + MW detector that has a detection range of 25 x 30 m and a 90-degree angle. It can also be configured to have a 25 m and a 5-degree angle for long-range detection. It is suitable for zone 0, 1, and 2 and gas group IIB.

MMO Ex: This is a single PIR detector that has a detection range of 15 x 15 m and a 90-degree angle. It is suitable for zone 0, 1, and 2 and gas group IIB.

You can also find intrinsically safe power supplies, relay separators, and explosion-proof housings on our website presenting Atex certified products. All the products are certified by FTZU to ATEX and IECEx standards and come with a warranty and technical support.

If you want to learn more about intrinsic safe PIR detectors and how they can help you protect and control your hazardous areas, you can contact Atex certified by filling out the online form or calling the phone number on their website. They will be happy to answer your questions and provide you with a quote for your project.