NYX PRLT Steel-Toe Internal Length Tester
| Brand | NYX |
|---|---|
| Origin | Tianjin, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | PRLT |
| Measurement Range | 100 mm |
| Resolution | 0.02 mm |
| Compliance | GB/T 20991–2009, EN ISO 20344:2011 Section 5.3 |
Overview
The NYX PRLT Steel-Toe Internal Length Tester is a precision mechanical gaging instrument engineered for the standardized measurement of internal length—the axial distance from the toe cap’s frontmost point to the rear edge of the protective steel or composite insert—within safety footwear. This measurement is critical in verifying conformance to structural integrity requirements defined in international personal protective equipment (PPE) standards. The device operates on a direct-contact, linear displacement principle using a hardened stainless-steel sliding probe and calibrated vernier-scale ruler assembly. Unlike optical or digital alternatives, the PRLT relies on tactile mechanical feedback and physical zero-reference alignment, ensuring metrological stability without dependence on power sources, firmware updates, or environmental calibration drift. Its design adheres to the dimensional verification protocol specified in Clause 5.3 of EN ISO 20344:2011 and Section 6.3.1 of GB/T 20991–2009, both of which mandate traceable, repeatable assessment of toe cap positioning relative to the shoe’s forepart geometry.
Key Features
- Fixed-range linear measurement system with 100 mm maximum travel, optimized for standard safety shoe toe cap dimensions (typically 85–98 mm internal length)
- Mechanically engraved scale with 0.02 mm resolution, certified to ISO 6507-1 hardness testing standards for scale durability and wear resistance
- Integrated zero-reference shim (included) enabling rapid recalibration prior to each test series per ISO/IEC 17025:2017 clause 7.7.1
- Non-slip anodized aluminum base plate with recessed locating groove to stabilize footwear sole during insertion
- Probe tip manufactured from tungsten carbide (HV 1500), minimizing deformation when contacting hardened steel toe caps
- No electronic components—fully compliant with explosion-proof environments and electromagnetic compatibility (EMC) Class A industrial settings
Sample Compatibility & Compliance
The PRLT accommodates all common safety footwear configurations including lace-up, slip-on, and hybrid composite-toe designs, provided the toe box opening permits unobstructed probe insertion. It supports testing of both metallic (steel, aluminum alloy) and non-metallic (carbon fiber-reinforced polymer, thermoplastic polyurethane) protective inserts. The instrument satisfies mandatory testing requirements under Regulation (EU) 2016/425 for Category II PPE, and is routinely referenced in type-examination reports issued by notified bodies such as DEKRA, SGS, and CQC. All measurements are traceable to China National Institute of Metrology (NIM) secondary standards via documented calibration certificates (certificate validity: 12 months). The device itself carries no CE marking, as it is classified as a metrological auxiliary tool—not a measuring instrument subject to MID Directive 2014/32/EU.
Software & Data Management
The NYX PRLT is a standalone mechanical instrument and does not incorporate embedded software, wireless connectivity, or data logging capabilities. This architecture eliminates cybersecurity vulnerabilities, firmware obsolescence, and regulatory complications associated with computerized test systems. Users record measurements manually in laboratory notebooks or LIMS-compatible spreadsheets. For laboratories operating under GLP or ISO/IEC 17025 accreditation, manual entry is supported by dual-signature verification protocols and controlled-form documentation (e.g., SOP-QC-087 Rev. 3). Optional accessories include NIST-traceable calibration blocks (certified ±0.01 mm) and audit-ready calibration logs aligned with FDA 21 CFR Part 11 electronic record requirements when digitized via scanned signed forms.
Applications
- Pre-production validation of toe cap placement during footwear manufacturing QA cycles
- Third-party conformity assessment for CE marking and CCC certification submissions
- In-process inspection at final assembly stations to prevent nonconforming lot release
- Root cause analysis of field failures related to toe cap migration or inadequate anchoring
- Inter-laboratory comparison studies coordinated under APAC ILAC MRA frameworks
- Training tool for auditors and technical assessors conducting factory inspections per ILO Convention No. 155
FAQ
Is the PRLT suitable for testing composite-toe shoes?
Yes. The tungsten carbide probe tip and low insertion force (< 2.5 N) prevent surface damage to polymer-based toe caps while maintaining measurement fidelity.
Does the device require annual recalibration?
Per ISO/IEC 17025:2017, recalibration is recommended every 12 months—or after 500 measurement cycles—using certified reference shims traceable to NIM.
Can it be used for EN ISO 20345-compliant boots?
Yes, provided the boot’s toe box geometry allows full probe engagement; high-shaft styles may require partial disassembly of upper material for access.
What documentation accompanies shipment?
Each unit includes a factory calibration certificate, zero-reference shim, operator instruction manual (EN/zh bilingual), and ISO 9001:2015 manufacturing compliance statement.
Is repair service available outside China?
Yes. NYX maintains authorized service partners in Germany (Düsseldorf), USA (Raleigh, NC), and Malaysia (Kuala Lumpur) for mechanical refurbishment and scale verification.
