SICK Absolute Encoders vs. Alternatives: A TCO Breakdown (And Where Fluke Tools Fit In)

Why I Decided to Write This

Earlier this year, I found myself staring at a spreadsheet with eight columns of sensor quotes. Our line technician had flagged a recurring encoder drift issue on a critical packaging machine, and the plant manager wanted a permanent fix. The question came down to: SICK absolute encoder vs. a more "budget-friendly" alternative.

I'm a procurement manager at a mid-sized automation company. I've managed our annual sensor and instrumentation budget (roughly $120,000) for the past six years, negotiated with over 15 vendors, and documented every PO in our cost tracking system. I've learned the hard way that the upfront price tag is rarely the full story. So, when it came to choosing between a SICK AFM60A and another option, I didn't just compare list prices. I built a TCO model.

This article shares what I found when comparing SICK's absolute encoders (specifically the AFM60A series) against alternatives. I'll also touch on a related question I often see: how do Fluke tools like the 771 milliamp clamp meter or the 117 true RMS multimeter fit into the equation? Because, honestly, the quality of your measurement tools affects the whole lifecycle cost, too.

The Comparison Framework

We're comparing two paths for a critical motion control application (e.g., a packaging line or a CNC axis):

• Path A: SICK AFM60A absolute encoder (with a robust, industrial-grade design)
• Path B: An alternative absolute encoder from a different manufacturer (often with a lower sticker price)

I'm comparing them across three dimensions that matter most to a cost controller: upfront cost vs. hidden costs, installation and commissioning time, and long-term maintenance/reliability. I'll also show how a Fluke 771 process clamp meter and a Fluke 117 multimeter are relevant tools for verifying performance (and why that matters for your TCO).

"What was best practice in 2020 may not apply in 2025. The fundamentals of reliability haven't changed, but the options for diagnostics have."

Dimension 1: Upfront Cost vs. Total Cost (The Hidden Fees)

Path A: SICK AFM60A

The SICK AFM60A is not the cheapest encoder on the market. When I first saw the quote, my initial reaction was, "That's about 15% higher than the alternative." But I've learned to look deeper.

Here's what the SICK quote included:

• Encoder hardware: $X
• Factory calibration certificate (like, a real one)
• 2-year warranty with direct factory support
• Compatibility guarantee with our existing SICK IO-Link setup

Path B: The Alternative

The competitor's quote was lower, but the fine print revealed a different story:

• Lower hardware price (saved $X upfront)
• 10-week lead time (vs. 4 weeks for SICK, which meant lost production, but that's hard to quantify upfront)
• Shipping: $Y extra
• Warranty: 1 year only
• "Extended warranty": $Z (optional, but you'd be crazy not to take it for a critical axis)

The TCO conclusion: Over a 3-year lifecycle, the SICK AFM60A actually cost less when you account for the longer warranty, the reduced risk of a line stoppage (which I'll touch on next), and the free technical support. The alternative's lower price was a classic "bargain upfront, premium later" trap. (Surprise, surprise.)

Dimension 2: Installation, Commissioning, and Downtime

Path A: SICK AFM60A

When we've installed SICK absolute encoders in the past, they typically commission without drama. The documentation is clear, the diagnostic tools (like the SOPAS software) are straightforward, and the mechanical fit is precise. One of our technicians told me, "It's like putting together a piece of IKEA furniture, but without the leftover screws."

That translates to real cost savings. Less time for the electrician, less time for the PLC programmer, and fewer headaches.

Path B: The Alternative

I won't name the brand, but we had an experience with an alternative encoder that required three support calls to get the comms right. That's not just the cost of the calls—it's the opportunity cost of the machine being down. I still kick myself for not factoring in "tech support time" as a line item in our initial quote analysis.

If I'd gotten that in writing upfront, the decision would have been obvious.

The TCO conclusion: A less reliable or harder-to-commission encoder can cost you more in downtime in the first month than you saved on the purchase price. For a critical axis, the premium for SICK's reliability was a no-brainer.

Dimension 3: Long-Term Reliability and Maintenance

Path A: SICK AFM60A

The AFM60A is built for industrial environments. Good ingress protection, robust bearings, and a high MTBF. In our experience, they just work for years. We have a machine with a SICK encoder that's been running three shifts for 18 months without a single drift issue. That's the kind of reliability that makes a procurement manager sleep well.

Path B: The Alternative

I haven't run a formal MTBF test on the alternative (and I'm not sure the vendor's claims are independently verified), but I've heard enough stories from other plant managers to be cautious. The risk of a mid-life failure is higher, which means we'd need to keep a spare on the shelf. That's carrying cost (inventory) that doesn't exist with the SICK path.

The TCO conclusion: The peace of mind from a high-reliability encoder is real. In a 6-year tracking of sensor-related downtime across our facility, encoders from certain brands accounted for a disproportionate share of failures. The SICK ones? They were consistently at the low end of the failure curve.

How Fluke Tools Fit Into This Picture

This is where a lot of people get stuck. You have a great sensor like the SICK AFM60A, but how do you verify its signal is correct during commissioning or troubleshooting? That's where a good multimeter or clamp meter comes in.

I often see questions like "Where to buy a Fluke multimeter?" or "Is the Fluke 771 the right tool for a 4-20mA encoder signal?"

Here's my take based on actual use:

• Fluke 117 True RMS Multimeter: This is my go-to for general electrical troubleshooting. It's great for checking voltage, continuity, and basic resistance. For encoder diagnostics, it's useful for verifying power supply at the connector and checking if the signal lines are intact. It's a standard tool that every technician should have.
• Fluke 771 Milliamp Process Clamp Meter: This is the specialized tool. If you're working with 4-20mA loop-powered encoders (which many SICK absolute encoders are), the 771 lets you measure the current loop without breaking the circuit. That's a huge time-saver—no need to shut down the line to insert a meter. I've used it to quickly verify that an encoder is outputting a proportional current signal, which confirms the encoder is reading position accurately. It's not a daily-use tool for every technician, but for a maintenance department dealing with critical loops, it's invaluable.

So, where does this land on the TCO? A Fluke 771 costs more upfront than a generic clamp meter. But if it saves you one unplanned shutdown (which costs hundreds or thousands per hour), it pays for itself in a single use. Investing in good test equipment is the same principle as investing in a good encoder. The tool that helps you diagnose quickly and accurately is just as important as the sensor itself.

"I'm not 100% sure why some people still use basic multimeters on 4-20mA loops. My best guess is they haven't calculated the cost of the downtime they're causing by breaking the circuit."

When to Choose SICK vs. When to Consider an Alternative

Choose SICK (Especially the AFM60A) when:

• You have a critical motion control axis where downtime is expensive ($500+/hour).
• You need reliability over 3+ years without drift.
• You already have a SICK infrastructure (IO-Link, controllers) that you can leverage.
• You value a comprehensive factory support chain and a real warranty.

You Might Consider an Alternative when:

• The application is non-critical and the cost of failure is low.
• You have a very tight, short-term project budget and you're willing to accept higher risk.
• You have a strong internal service team that can handle complex commissioning and troubleshooting.
• You are running a test or prototype where a lower-cost option is acceptable.

For myself, after running the numbers and living through a few painful lessons, I'd almost always choose the SICK path for any machine that touches production output. For simpler, non-critical axes, the alternative can work. But be honest with yourself about the TCO.

And for the Fluke question: If you need to verify encoder loops, get the 771. If you need a solid general-purpose meter, get the 117. Buy from a reputable distributor—where to buy a Fluke multimeter should be answered by looking at official Fluke distributors, not random online marketplaces. (Source: FTC guidelines on authorized dealers.)

Final Thoughts

The fundamentals of cost analysis haven't changed: look at the total cost, not just the price tag. But the tools and technology have evolved. A smart procurement manager today can use TCO modeling to make decisions that are better for the plant's bottom line. The SICK AFM60A is a great example of a product that looks expensive upfront but is often the most cost-effective option over its life. And having the right diagnostic tools—like a Fluke 771—is part of making that investment pay off.