6 Things Nobody Tells You About Buying SICK Sensors (Until You Screw Up)

Look, I've been handling industrial sensor orders for about eight years now. In that time, I've personally made enough mistakes to fund a small vacation. Roughly $4,700 in wasted budget, if I'm counting honestly. I now maintain our team's pre-purchase checklist, and this article is basically that checklist in FAQ form.

If you're researching sick absolute encoder afm60a, laser distance sensor options, or wondering about ir thermometer specs — or even comparing a megger vs multimeter for your next inspection — these are the questions I wish someone had answered for me.

1. What's the real difference between SICK absolute encoders and incremental ones — and why do people over-spec the AFM60A?

I assumed 'absolute' was always better. Didn't verify. Turned out I was paying for a feature nobody on our line needed. The sick absolute encoder afm60a is a great piece of kit — but it's designed for applications where you need position data immediately after power-up, no homing cycle required. If your system runs a homing routine anyway, an incremental encoder (like the DFS60) saves you roughly 20-30% per unit.

Here's the thing: I once ordered 12 AFM60As for a conveyor indexing section. Checked it myself, approved it, processed it. We caught the error when the senior tech asked why we were using absolute encoders for a system that homed every startup. $2,100 wasted, credibility damaged. Lesson learned: match the encoder type to the actual system behavior, not the spec sheet.

2. Are all laser distance sensors created equal? (Spoiler: no, and here's why.)

It's tempting to think you can just compare measurement range and accuracy. But identical specs from different vendors can result in wildly different outcomes. A laser distance sensor from SICK (like the DL35 or DT35 series) handles ambient light and surface reflectivity differently than competing models.

Why does this matter? Because on a shiny metal surface at 15 meters, one sensor might give you ±3 mm repeatability while another drifts. I learned this the expensive way — a $3,200 order for sensors that worked perfectly in the demo lab but failed on the factory floor. The vendor who said 'this is our strength, but for your specific surface, here's who does it better' earned my trust.

3. Can an IR thermometer replace a thermocouple for industrial process monitoring?

The short answer: not for closed-loop control. An ir thermometer (like SICK's TPS series) is excellent for spot-checking moving targets, high-temperature surfaces, or hazardous zones. But it measures surface temperature only — not internal temperature. It also depends on emissivity settings, which most people get wrong.

Real talk: I once tried to use an IR thermometer for a curing oven validation. The readings looked fine on my screen. The result came back from the client's QC — 12 items, $890 in redo, straight to the trash. That's when I learned: IR thermometers are for screening, not for certification. For traceable measurements, you still need contact probes or calibrated thermal imaging (like SICK's IVC-3D, if you're matching surface patterns).

4. Megger vs multimeter: when should I use each one?

This is the question I get most often from newer maintenance engineers. And it's a classic oversimplification trap. People think a multimeter measures voltage and resistance, so it should be enough for cable testing. But here's the nuance:

• Multimeter (like Fluke 87V): measures continuity, low resistance, voltage, current. Great for troubleshooting live circuits and checking basic cable integrity.
• Megger (insulation resistance tester): measures resistance at high voltage (typically 500V, 1000V, or 5000V). This reveals insulation breakdown that a standard multimeter would miss entirely.

The advice 'just use a multimeter for everything' ignores the fact that motor windings and long cable runs degrade over time. A megger catches that degradation before it causes a short. I learned this after a 3-day production delay caused by a cable that passed continuity checks but failed under load.

For the record: SICK doesn't make meggers, and they shouldn't. That's Fluke's territory. The supplier who told me 'this isn't our strength — here's who does it better' earned my business for everything else.

5. SICK vs Omron vs Keyence sensors — is one brand really 'better'?

Let me be direct: there's no universal winner. Each has strengths. Here's my take after years of field experience:

• SICK: exceptional durability and interference resistance. Their photoelectric sensors (like the W4F or VTF18) are industry benchmarks for harsh environments. The sick absolute encoder afm60a is widely considered top-tier for precision positioning.
• Omron: better integration with their own PLC ecosystem (Sysmac). If you're already Omron-native, their sensors make sense for UI consistency.
• Keyence: superior sales support and demos. But their pricing often reflects that service model, not necessarily better hardware.

The question isn't 'which brand is best?' It's 'which sensor is best for your specific application?'

6. Where can I find reliable SICK encoder distributors — and how do I vet them?

This was my biggest blind spot. I assumed any authorized distributor was equally competent. Wrong. Some are simply order-takers. Others have application engineers who actually understand what you're trying to do.

When searching for sick encoder distributors, here's what I've learned to check:

• Ask if they've handled your specific encoder type (e.g., AFM60A vs DFS60 vs ATM60). If they hesitate, move on.
• Request lead times for both standard and custom configurations. A good distributor will tell you truthfully, not just quote a number.
• Check their return policy. If it's less than 30 days, they don't stand behind their recommendations.

There's something satisfying about a perfectly executed rush order from a distributor who actually knows their product line. After the stress of a failed spec, seeing the right encoder arrive on time and correct — that's the payoff.