How to specify pressure-sensitive safety products

We've seen it first-hand so many times in so many ways. Whether it's mobile elevated working platforms (MEWPs) exposed to harsh weather, CNC machines supplied with bare-minimum safety mats, or autonomous guided vehicles (AGVs) where an off-the-shelf bumper gets vandalised out of use, the story is often the same: a quick purchase that becomes a permanent liability.

Fortunately, it doesn't have to be this way. Here's what to consider before specifying pressure-sensitive safety equipment - ribbon switches, sensing edges, safety bumpers and safety mats - and why a short conversation with a specialist can save serious costs down the line.

Sensing edges - More than a rubber strip: Sensing edges are used anywhere there's a moving part that might trap or injure someone - doors, conveyors, lifting platforms, machine guards and more. But not all edges are equal. Some are built from conductive rubber DIY kits with exposed connectors. Others, like Tapeswitch's, are sealed using RF technology and water-tested to ensure reliable use outdoors.

On MEWPs, for example, the sealing of the cable exits is absolutely critical. Tapeswitch has supplied thousands of sensing edges for scissor lifts that live outdoors year-round. These need to survive rain, UV exposure and tampering. A poorly sealed edge won't last a season.

Then there's the question of form. Can the edge go around corners? Will it mount cleanly to your framework? Does it come with pre-drilled holes or mitred joints? These are easy details to adjust in manufacturing, but in a production unit, near impossible to change once the product is embedded. In short: treat sensing edges as a system, not a commodity. Get the spec right from the start.

Safety mats - One size rarely fits all: We often hear from machine shops replacing the OEM safety mats that came with their CNCs. They're usually poor quality, small in coverage, and treated as a tick-box exercise. The result is multi-mat installations across zones where fewer, larger, bespoke mats could do the job more effectively.

A typical example might be a CNC that arrives with 8-12 small safety mats, each wired in series. It works, technically. But it's fragile, cluttered and overcomplicated. In many of these cases, Tapeswitch can replace the whole lot with just two or three larger mats, made to fit the working area precisely.

Environmental conditions also matter. In areas prone to oil, swarf, heavy foot traffic or washdown, a standard mat won't last long. Options like reinforced materials, cut-outs for floor anchors, and sealed connectors can extend lifespan dramatically. Again, a brief chat at the start of the design process can prevent years of maintenance calls.

Safety bumpers - Built for abuse: Where more force is involved, such as with AGVs, robotic arms or moving gantries, safety bumpers are often the better solution. These are deeper, foam-filled units designed to absorb impact as well as detect it.

But durability is everything. Tapeswitch worked with a major OEM whose AGVs were fitted with generic sensing edges. Not only did they degrade rapidly in use, but operators began to vandalise or bypass them, seeing them as a nuisance. The company ended up replacing the whole system with custom bumpers, shaped to fit the vehicle profile and engineered to withstand knocks. Since then, the number of system failures has dropped to near zero.

Specifying a bumper means considering actuation force, overtravel distance, mounting method and overall shape. Many assume a rectangular profile is all that's available, but bumpers can be L-shaped, angled or custom-cut to match an enclosure.

Designing for reality

It's tempting to think of safety devices as 'plug and play', but in practice, their reliability depends on details that rarely make it onto datasheets: the routing of cables, the location of connectors, the ambient temperature, the way operators interact with equipment. That's why experienced safety suppliers will always ask about the bigger picture before recommending a product.

There's also aesthetics to consider. In customer-facing applications, bulky profiles or untidy wiring can ruin a polished design. Increasingly, we're asked to build sleek, unobtrusive safety systems that blend into enclosures or robotic platforms. With modern manufacturing, this isn't hard, so long as you've planned for it.

Design engineers are rightly proud of their independence, but safety products are one area where collaboration pays off. A quick discussion about your application (what it does, where it runs, who uses it) can reveal opportunities to simplify, strengthen, or reduce costs.

The internet is great for datasheets. But if your safety product is going to be built deep into a machine, exposed to abuse, or relied upon to protect people, there's no substitute for speaking to someone who's seen it all before.

After all, the best time to change a product spec is before you've ordered it. The second-best time? Before the machine ships.