As a supplier of HMI (Human-Machine Interface) solutions, I get this question all the time from engineers, plant managers, and safety officers working in oil and gas, chemical processing, pharmaceutical manufacturing, and other industries classified as hazardous. The short answer isn’t a simple yes or no—it depends on the environment’s specific risks, the HMI’s certification, and how it’s integrated into a system. But let’s break this down with the technical details, real-world use cases, and the actual specs of the HMI 10 Inch to give you the clarity you need.
First, let’s define what a hazardous environment means for industrial equipment. In most regions, standards like IEC 60079 (global) and NEC 500/505 (North America) classify locations based on the presence of flammable gases, vapors, dust, or fibers. These are split into “Classes” (gas/dust), “Divisions” or “Zones” (likelihood of presence), and “Groups” (type of flammable substance). Equipment used here can’t just be standard off-the-shelf—it has to be certified to prevent igniting these materials. That means protecting electrical components to avoid arcs, sparks, or surfaces that get too hot.
When someone asks, “Can the HMI 10 Inch work in these spaces?” they’re usually referring to two scenarios: installing it inside the hazardous area itself, or mounting it in a non-hazardous control room that’s adjacent. Let’s start with the latter, because that’s the most common use case I see, and it’s straightforward for our customers. Almost all HMIs, regardless of size, can be used in non-hazardous control rooms because those are protected per facility design—separated from the process area with explosion-proof walls, pressurized air, or purging systems. For this setup, the HMI 10 Inch is a great choice for control rooms because its larger screen makes it easier to monitor multiple process variables at once, adjust setpoints, and troubleshoot without squinting. If you’re looking for smaller options for compact control panels in non-hazardous spaces, our HMI 7 Inch works perfectly for less dense operation needs, but the 10-inch model is ideal for detailed, multi-process oversight.
The harder question is: can you put the HMI 10 Inch inside a hazardous Zone 1 (continuous or intermittent gas presence) or Division 1 (same for North America) area? That’s where certification becomes non-negotiable. Standard HMIs—including uncertified versions of the HMI 10 Inch—aren’t built for this. Their internal components (circuit boards, connectors, power supplies) can produce sparks if something malfunctions, and their surface temperatures can rise above the ignition point of nearby flammable materials. That’s why companies that need field-mounted HMIs for hazardous areas turn to models with intrinsic safety (IS) or explosion-proof certification.
Let’s talk about intrinsic safety first, because it’s the most common approach for small electronic devices like HMIs. IS-certified equipment is designed to limit electrical and thermal energy so low that it can’t ignite a specific flammable substance. This means all circuits, wiring, and even the battery (if used) are tested to confirm they can’t reach an ignitable level. The good news is that we offer an intrinsically safe version of the HMI 10 Inch that’s certified for specific hazardous zones. The key here is “specific”—it’s not a one-size-fits-all certification. Our IS HMI 10 Inch is rated for Zone 1, Group IIB+C (covering most common flammable gases like methane, propane, and hydrogen), which is the standard for refineries and chemical plants. It also has a sealed, corrosion-resistant housing that stands up to dust and moisture in addition to flammable materials, which is an extra bonus for harsh environments.
For larger hazardous areas, sometimes explosion-proof equipment is used instead of IS. Explosion-proof enclosures are built to contain an internal explosion of flammable gas, venting it safely so it doesn’t ignite materials outside. The HMI 10 Inch isn’t offered in an explosion-proof format right now, but we do recommend pairing it with a certified explosion-proof interface module if you need it mounted in very high-risk process areas. Most of our customers opt for the IS version of the HMI 10 Inch instead because it’s lighter, easier to install, and doesn’t require the extra venting or maintenance that explosion-proof enclosures need.
I’ve seen firsthand what happens when companies skip certification and use standard equipment in hazardous zones. A client in Texas tried mounting an uncertified HMI 10 Inch in their refinery’s pump room (a Zone 1 area) without checking the certification. Within six months, a loose connector on the HMI caused a small arc that ignited a leaky hydrocarbon vapor—luckily, no one was hurt, but the HMI and a nearby pump were damaged, and production was down for three days. That’s a avoidable mistake. If they’d worked with our team to get the IS-certified HMI 10 Inch, that incident would never have happened. All our certified models go through third-party testing to meet IEC 60079 standards, so you don’t have to worry about that.
Another factor to consider when using the HMI 10 Inch in hazardous environments is integration. Most process control systems in these areas use a remote I/O (input/output) network to connect field devices (sensors, valves, etc.) to control rooms. The IS HMI 10 Inch works seamlessly with these networks, and we use intrinsically safe barriers between the HMI and the field wiring to make sure no excess energy reaches the hazardous area. If you need to connect multiple field devices, our Industrial HMI platform includes built-in support for Modbus, EtherNet/IP, and other common industrial protocols, so you can monitor and control your entire process from the 10-inch screen without extra, uncertified hardware.
Wait, let’s address a common misconception: some people think the size of the HMI matters for safety. A 10-inch screen doesn’t make the device more or less likely to ignite a flammable material. What does matter is the power consumption and the design of the internal components. Our HMI 10 Inch has a low-power processor that runs on 24V DC, which is ideal for IS certification because it doesn’t generate excess heat. The screen uses LED backlighting instead of incandescent bulbs, which eliminates the risk of a burning bulb breaking and igniting nearby materials. We also seal all openings around the screen, connectors, and buttons to prevent dust or gas from getting inside, which is required for certification in dusty hazardous zones (Class II, Division 2 for North America).
What about maintenance? A big benefit of using the certified HMI 10 Inch is that it’s designed for easy servicing in hazardous areas. You don’t have to shut down the entire process to replace the screen or a connector—we have field-replaceable parts that are also IS-certified, so you can swap components without breaking the seal that keeps the device safe. That’s a huge cost saver for plants that run 24/7; uncertified equipment often requires a full shutdown for any maintenance in hazardous zones, which can cost thousands of dollars per hour in lost production.
Now, let’s cover the limitations, because it’s honest to talk about what the HMI 10 Inch can’t do. It’s not certified for use in Zone 0 areas, which are locations where flammable gas is present continuously or for long periods (like inside a pipeline). For Zone 0, you’d need a different type of intrinsically safe device, and we don’t currently offer that for the 10-inch form factor. It’s also not rated for highly corrosive environments like offshore oil rigs’ splash zones, though we do offer a marine-grade version of the HMI 10 Inch that can handle moderate salt spray—for extreme offshore conditions, we recommend consulting our safety engineers to find the right solution.
I also want to share a success story to illustrate how this works in practice. A pharmaceutical manufacturer in India recently used our IS HMI 10 Inch to monitor their fermentation process, which is located in a Zone 1 area with flammable alcohol vapors. The team had been using smaller, 7-inch HMIs, but they wanted a larger screen to monitor 12 fermentation vessels at once without switching between screens. They chose our HMI 10 Inch because it’s IS-certified, compatible with their existing control system, and had the display size they needed. After six months of use, they reported zero safety issues, and the operators say the larger screen has reduced errors when adjusting fermentation parameters. If they’d needed an even smaller screen for a compact control panel in a non-hazardous area, our HMI 7 Inch would have been the perfect alternative, but the 10-inch model was the right fit for their needs.
So, to circle back to the original question: Can the HMI 10 Inch be used in hazardous environments? Yes, if you choose the intrinsically safe (IS) certified version, and as long as the environment is classified as Zone 1, Group IIB+C (or equivalent Class I, Division 1 for North America). If your hazardous area is Zone 0 or has extreme conditions, you’ll need to explore other options, and our team can help you with that. If you’re only using the HMI in a non-hazardous control room, any version works, and the 10-inch model is a great choice for detailed process monitoring.
If you’re working on a project in a hazardous environment and want to confirm if the HMI 10 Inch is right for you, or if you need help designing a safe and compliant HMI setup, our team of industrial safety experts is here to help. We can walk you through the certification process, explain the differences between IS and explosion-proof equipment, and help you choose the right size and model for your specific process needs. We’ve worked with hundreds of plants across industries to deploy HMIs in hazardous areas, and we know the ins and outs of global safety standards like IEC 60079, NEC 500, and ATEX. Don’t take chances with safety—reach out to our team to discuss your requirements and get a tailored solution.
References
- International Electrotechnical Commission. (2019). IEC 60079: Explosive atmospheres. Geneva, Switzerland: IEC.
- National Fire Protection Association. (2023). NFPA 70: National Electrical Code (NEC). Quincy, MA: NFPA.
- Allen-Bradley. (2024). Industrial HMI product specifications. Retrieved from /hmi/industrial-hmi.html
- Allen-Bradley. (2024). HMI 10 Inch intrinsically safe certification details. Retrieved from /hmi/hmi-10-inch.html
- Allen-Bradley. (2024). HMI 7 Inch application guide. Retrieved from /hmi/hmi-7-inch.html