Magnafield — YokeLite AC Electromagnetic Yoke

230V / 50-60 Hz | Complies with ASTM E709 & ASTM E1444SKU: YOKELITE230

Overview

The Magnafield YokeLite is an advanced, professional-grade AC electromagnetic yoke engineered for Magnetic Particle Inspection (MPI) of ferromagnetic components in field, shop, and in-service inspection environments. Designed to comply fully with ASTM E709 and ASTM E1444 — the two primary American standards governing magnetic particle testing equipment and technique — the YokeLite delivers the magnetic field strength, durability, and ease of use that NDT professionals demand for reliable surface and near-surface flaw detection.

The YokeLite's standout design feature is its compatibility with removable UV-A and white light attachments that slide directly onto the yoke's rear leg — allowing the inspector to simultaneously magnetize the part and illuminate the inspection area with a single tool. This innovative integration eliminates the need for a separate handheld UV lamp or white light during fluorescent and visible particle inspections, dramatically improving operator efficiency, reducing equipment clutter, and freeing up the operator's hands.

Important Note on Lamps: The UV-A and white light attachments shown in product images are sold separately and are not included with this listing. They are available on our website as:

• NM01UVLIGHT — UV-A LED Light Attachment

• NM01WHITELIGHT — White LED Light Attachment

Key Specifications

Box Dimensions & Shipping Weight (Estimated)

Dimensions and weight are estimates based on typical packaging for AC electromagnetic yoke units of this class. Please verify with your freight forwarder prior to shipping.

Why AC? — Surface Flaw Detection Explained

The YokeLite operates on alternating current (AC) — the preferred waveform for detecting surface-breaking discontinuities in ferromagnetic materials. The AC waveform creates a dynamic, pulsating magnetic field that agitates fluorescent or visible magnetic particles, improving their mobility and migration toward surface indications — resulting in sharper, more clearly defined indications compared to DC or half-wave DC fields.

AC yokes are the industry standard for detection of the following surface and near-surface defect types:

• Fatigue cracks and stress cracks
• Grinding cracks and quench cracks
• Seams, laps, and cold shuts
• Weld toe cracks and underbead cracks
• Inclusions and laminations breaking the surface
• Shrink cracks and tears in castings and forgings
• Welding slag inclusions at the surface

Integrated Light Attachment System

The YokeLite features a proprietary rear-leg light attachment system — a sliding mount that accepts both the UV-A and white light accessories directly onto the yoke body, positioning the light precisely over the inspection area at all times.

Benefits of the integrated light system:

• Hands-free illumination — both hands remain on the yoke at all times; no need to hold a separate UV lamp or white light
• Consistent light positioning — the light always illuminates the exact area being magnetized, with no shadow or off-angle lighting
• Reduced equipment clutter — eliminates one item from the inspector's hands and reduces cable management on site
• Fast switching — the UV-A and white light attachments slide on and off quickly, allowing rapid switching between fluorescent and visible particle inspection modes
• Enhanced portability — a single tool replaces two, simplifying equipment transportation and setup

How to Use the YokeLite

1. Connect the detachable power cord to the yoke and plug into a 230V power supply
2. Position yoke legs at right angles to the direction of suspected discontinuities — adjust leg span as needed for best surface contact
3. Depress the trigger to energize the yoke and apply magnetic particles to the area between the legs
4. While energized, blow off excess dry powder or evaluate the wet particle bath to reveal indications
5. Evaluate indications for size, shape, and location against applicable acceptance criteria
6. Reposition yoke legs at 90° to the previous position and repeat to detect indications in all orientations
7. Demagnetize by slowly withdrawing the energized yoke from the surface to a distance of at least 18 inches / 45 cm

Compliance & Standards

The Magnafield YokeLite 230V fully meets the requirements of the following standards and specifications:

• ASTM E709 — Standard Guide for Magnetic Particle Testing
• ASTM E1444 — Standard Practice for Magnetic Particle Testing
• ASTM E3024 — Standard Practice for Magnetic Particle Testing of Welds
• ISO 9934-3 — Non-destructive testing: Magnetic particle testing — Equipment
• MIL-STD-271 — U.S. Military specification for NDT requirements for shipbuilding
• ASME Boiler & Pressure Vessel Code — Section V, Article 7
• CE / WEEE / RoHS / UKCA — European and UK product compliance

Ideal Applications

• Weld inspection — butt welds, fillet welds, nozzle welds, and repair welds
• In-service inspection of pressure vessels, piping, and structural components
• Field inspection of pipelines, offshore platforms, and structural steel
• Fabrication shop quality control and acceptance testing
• Maintenance inspection of rotating machinery, shafts, and lifting equipment
• Aerospace component inspection — landing gear, engine mounts, structural members
• Any ferromagnetic surface or near-surface flaw detection application requiring ASTM E709 / E1444 compliant equipment

About Magnafield

Magnafield is a specialist designer and manufacturer of magnetic particle inspection (MPI) equipment trusted by NDT professionals across the oil and gas, petrochemical, aerospace, shipbuilding, and structural fabrication industries. The YokeLite series represents Magnafield's commitment to advancing MPI yoke technology — combining proven electromagnetic performance with innovative integrated lighting solutions that improve inspector productivity and inspection quality.