Preliminary Report – Hands-On Evaluation of the Thermo Fisher Niton XL5 Portable XRF

Following an invitation from Yaron of R.B.M. Instrumentation & Control Ltd., I was pleased to visit and examine the new Thermo Fisher Niton XL5 portable XRF analyzer.
The purpose of the visit was a practical evaluation of the instrument’s performance, with emphasis on applications relevant to precious metals, alloys, and electronic materials.

For this assessment, I performed a series of measurements on reference samples with known compositions, using the Electronics Mode measurement matrix, alongside rapid 10-second test runs.
In parallel, a direct comparison was carried out with the widely used Niton XL3, which remains a familiar benchmark in the industry.

General Findings

Analytical accuracy:
Both instruments delivered reliable and consistent analytical results.
In the tests performed, no significant improvement in fundamental analytical accuracy was observed in the XL5 compared to the XL3.
In other words, users familiar with the XL3’s analytical performance will find the XL5 meets similar accuracy expectations.

Key Improvements in the Niton XL5

While analytical precision remains comparable, the XL5 introduces several important upgrades in operation, ergonomics, and hardware capabilities:

• Smaller and lighter design – more comfortable for extended field operation
• Faster result acquisition
• More powerful X-ray tube – W5 versus W2 in the XL3
• Improved detection of light elements – enhanced identification of Mg, Si, and Al
• Hot-swap battery replacement – battery can be changed without shutting down the instrument
• Fiberglass detector protection grid – designed to prevent detector puncture damage, which can disable the unit

These enhancements translate into smoother field workflow and improved robustness for daily industrial use.

A Critical Field Lesson – Software Matters as Much as Hardware

During testing, I also examined a dental alloy containing gold and palladium.
In an initial test using Electronics Mode, the instrument reported the presence of platinum — despite the alloy containing no platinum at all.

The reason was straightforward: Gallium (Ga) was not included in the Electronics Mode elemental matrix. As a result, the algorithm misassigned part of the spectrum to platinum.

Once we switched to Precious Metals Mode, the issue was resolved, and the correct alloy composition was displayed.

This highlights an essential point:

Using XRF is not just pulling the trigger.
Selecting the correct measurement mode is critical.

For sensitive or high-value materials, I strongly recommend performing measurements in at least two different matrices — for example, Electronics Mode and Precious Metals Mode — to cross-verify results.
This adds roughly 10 extra seconds per test, but can prevent serious interpretation errors.

Conclusion

The Niton XL5 does not represent a major leap in fundamental analytical accuracy compared to the XL3.
However, it delivers a significant upgrade in usability, speed, ergonomics, and light-element detection.

For professional field users, the XL5 clearly represents a successful new generation of portable XRF analyzers.