Positive Material Identification (PMI)
For petroleum and petrochemical facilities, the emphasis on safety and accident prevention has never been greater - increased public scrutiny, stepped-up industrial safety regulations, and more stringent OSHA oversight and fines. This means that positive material identification (PMI) in alloys used throughout the physical plant is no longer a choice, but a necessity. Simply relying on spot testing of parts and subassemblies is too risky and totally unacceptable. Today's best practices include 100% material testing of all critical materials.
The PMI Tool You Deserve - Thermo Scientific Niton XRF Analyzers
Whether you're an inspector, manager, health and safety professional, or serve another important role, you are on the front lines of regulatory compliance. Using a Thermo Scientific Niton x-ray fluorescence (XRF) analyzer for your PMI testing needs can help you:
- Rapidly verify alloys in seconds
- Recover lost material traceability
- Isolate finished welds to validate filler material composition and dilution rates
- Confirm the integrity of process piping, valves, and reaction vessels
With more than a decade of experience in positive material identification instrumentation, also known as positive material identification equipment, our XRF instruments offer fast, accurate alloy identification and elemental analysis that ensures the integrity of your systems across the process plant:
- Rods and wire strands
- Finished welds and weld beads
- Bolts, rivets, and other fasteners
- Valves and flanges
- Complete reaction vessels
What's more, our total PMI testing solution not only provides fast, simple reporting and certificate generation for tamperproof results, but also includes industry-leading training and technology with comprehensive, turnkey API RP-578 programs.
Find It in the Library
With a unique library of 400+ alloy grades, our Niton XRF analyzers provide alloy chemistry for up to 30 of the most common elements in tens of thousands of alloy grades. Families of alloys that can be accurately identified and analyzed include:

- Stainless steels
- Cr-Mo steels including vanadium and tungsten stabilized versions
- Low alloy steel
- Tool steels
- Nickel, copper, titanium, and aluminum alloys
- Exotics, such as zirconium and tantalum alloys
Fast, Reliable PMI Testing - Take Matters into Your Own Hands
Your need for fast, reliable positive material identification is clear. Just as clear are the benefits your business can realize from using Niton® XL2 and Niton XL3 handheld XRF analyzers - now available with groundbreaking GOLDD™ technology.
When the job calls for verification of incoming, in-stock, or in-service materials, the Niton XL2 is your value choice. Finally, there's no need to sacrifice performance to get a lightweight, rugged tool for alloy grade ID that is perfectly matched to most applications. Should the need arise for better performance, isolation & analysis of welds and very small samples, or greater flexibility with your analytical needs, then choose the Niton XL3 for a wide array of standard and available options. But if you're looking for lab-quality results in the palm of your hand, then the Niton XL3 with GOLDD technology is the performance leader among all our Niton XRF analyzers.
Niton XL2 Series:
- Ruggedized for harsh production environments
- Asset recovery and traceability
- Rapid inspection anywhere data is required
- Standard analysis of up to 25 elements
Niton XL3 Series:
- Improved performance; upgradeable to GOLDD technology
- Perfect for weld analysis and comprehensive component inspection
- Optional integrated CamShot™ CCD camera for accurate sample positioning and image capture for traceability
- Optional WeldSpot™ small spot focus feature to isolate welds and very small samples
Niton XL3 GOLDD Series:
- Highest performance and sensitivity for the most demanding applications
- Light element analysis for superior performance identifying Al, Ti, bronze, and specialty alloy separations including SS303/SS304 based on sulfur content
- Trace elements for FAC modeling (Cr, Cu, Mo)
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Component analysis for HF alkylation (API RP-571) & low Si sulfidation (API RP-939-C) systems
Thermo Scientific Niton XRF Analyzers - Common Features
Niton XL2, Niton XL3, or Niton XL3t with GOLDD technology, the family resemblance is unmistakable. All of these tools offer you key features:
Niton XRF Analyzers – For All Your PMI Needs
Find out why Thermo Scientific Niton XRF alloy analyzers are the #1 choice in PMI testing worldwide. Contact us today for a demonstration and discover how these versatile instruments can help you.