What Should be Noted When Choosing IS Radios?

In industries where explosive atmospheres are a constant threat, safety is paramount. Intrinsically safe (IS) radios are essential tools, designed to prevent ignition in these volatile environments. But choosing the right IS radio involves more than just understanding the basic concept.

What is an "intrinsically safe" radio, and what does it mean?

IS radios are engineered to operate without the risk of sparking or overheating, even under fault conditions. They undergo rigorous testing and certification to meet stringent safety standards set by bodies like ATEX, IECEx, UL, CSA, and FM.

The organizations that set these standards follow strict protocols and testing procedures to ensure that equipment is designed and manufactured to prevent ignition of hazardous atmospheres. Certification usually involves detailed examination and testing of the equipment's design, construction, and performance under specified conditions.

Matching the radio to the hazard: classification systems

Choosing the correct IS radio class is critical. Different classifications define the types of hazardous environments and substances the radio can safely handle. The minimum marking must indicate Class, Division, Group, Maximum safe operating temperature or temperature range, and any special conditions that must be observed. 

Class – The type of explosive or ignitable substances present in the atmosphere.

Group – Materials grouped based on their ignition temperatures and explosion pressures.

Division – Evaluation of location, independent of the Class.

Temperature – Maximum operating temperatures on the surface of the equipment which should not exceed the ignition temperatures of the surrounding atmosphere.

Example Classification:

Hytera XRugged Smart Device PNC460U: Class I, II, III; Division 1; Groups C–G; T4 and -20°C to +60°C. It means the device is suitable for user in areas where flammable gases or vapors are present continuously or frequently during normal operation and includes the most hazardous gases like ethylene, propane, or gases with similar characteristics.

Download “Hytera Intrinsically Safe Two-way Radio Product Catalog” to learn more about key classification systems. We can also help get you the correct information if you need more detail.

Communication range and audio clarity

In potentially dangerous and hazardous environments like oil refineries, chemical plants, or mining sites, a wide communication range is essential. Limited range can hinder effective communication, especially when workers are separated by significant distances. For example, in a large oil field, a worker at one end might not be able to alert others at the opposite end about a potential gas leak if the radio's range is insufficient.

Audio clarity is equally crucial for clear message transmission. Poor audio quality can lead to misunderstandings, which could have serious consequences in emergencies. Imagine a scenario where a safety instruction is misinterpreted due to unclear audio, potentially causing incorrect actions and increasing the risk of accidents.

Here is an example. In a mining operation, an explosion-proof radio might need to have a communication range of at least 2 kilometers to cover the vast underground tunnels and a SNR of at least 60 dB for clear audio amidst the constant noise of machinery. In a chemical plant, where there are many metal structures that can affect the signal, the radio should be designed to handle such interference and still maintain audio clarity with minimal distortion.

Pay attention to IP rating

Explosion-proof environments are often harsh and exposed to elements such as dust, moisture, and chemicals. An appropriate IP rating ensures that the radio can withstand these conditions without being damaged or malfunctioning, thus guaranteeing reliable communication. If the radio is not adequately protected, water or moisture ingress could disrupt the internal circuitry, resulting in poor signal transmission or complete loss of communication. For instance, on an oil rig during a rainstorm, a radio with a low IP rating might fail, leaving workers unable to coordinate safely.

Additionally, a good IP rating extends the lifespan of the radio, reducing the need for frequent replacements and minimizing maintenance costs. This long-term reliability can be a significant factor for businesses, enhancing safety and efficiency.

Don't forget accessories

It's crucial to use only intrinsically safe accessories with your radio. These accessories are designed to maintain the overall safety of the system and prevent any potential ignition risks. 

Hytera is a global leader in intrinsically safe radio solutions, offering a wide range of devices and accessories certified to the highest safety standards. Our commitment to innovation and quality ensures that your communication systems remain reliable and secure, even in the most demanding conditions.

Click here to explore our intrinsically safe range.