Johnson & Allen – Calibrated Yoke Test Weights

Description

Johnson & Allen calibrated yoke test weights are designed for verifying the lifting strength and magnetic performance of permanent magnets and electromagnetic inspection equipment used in non-destructive testing (NDT). Lift testing provides a straightforward and practical method of checking MPI equipment performance and confirming that the required lifting forces are achieved in accordance with applicable inspection standards.

Manufactured for use with AC and DC magnetic particle inspection yokes, as well as permanent magnets, these test weights are available in a range of calibrated lifting capacities to suit different equipment configurations and pole spacing requirements.

Each test weight incorporates a heavy-duty lifting handle for safe and convenient handling during testing and is supplied with certification traceable to national standards.

Available in standard weights from 4.5 kg to 23 kg, Johnson & Allen can also manufacture bespoke calibrated test weights for specialist inspection requirements.

Features & Benefits

• Calibrated Test Weights: Designed for verifying the lifting strength of magnetic particle inspection equipment.

• Standard Compliance: Suitable for lift testing in accordance with specified ISO, ASTM and ASME requirements.

• Wide Weight Range: Available in capacities from 4.5 kg to 23 kg.

• AC and DC Compatibility: Options available for AC yokes, DC yokes and permanent magnets.

• Heavy-Duty Lifting Handle: Provides convenient handling during routine lift testing.

• Traceable Certification: Supplied with relevant certification traceable to national standards.

• Equipment Performance Verification: Provides a practical method of checking magnetic lifting capability.

• Bespoke Manufacturing: Custom calibrated test weights available for specialist applications.

Technical Specifications

Additional Information:

• Heavy-duty lifting handle fitted as standard.

• Supplied with relevant traceable certification.

• Bespoke calibrated weights available on request.

Important: ASTM E1444-21 removed the yoke lifting requirements included in earlier revisions. The 18 kg and 22.5 kg weights are referenced against the earlier ASTM E1444-16 edition.

Typical Applications

Johnson & Allen calibrated test weights are suitable for routine verification and performance checks of magnetic inspection equipment across a range of NDT applications.

• AC Yoke Lift Testing: Verification of AC magnetic particle inspection yokes using the 4.5 kg test weight.

• DC Yoke Lift Testing: Checking the lifting capability of DC electromagnetic yokes using the appropriate test weight for the equipment configuration.

• Permanent Magnet Testing: Verification of permanent magnet lifting performance.

• NDT Equipment Verification: Routine performance checks of magnetic particle inspection equipment.

• Inspection Quality Control: Supporting equipment verification procedures within industrial NDT quality management systems.

• Aerospace Inspection: Supporting magnetic equipment performance checks within aerospace inspection environments.

• Manufacturing and Engineering: Routine verification of MPI equipment used in production and maintenance inspection.

Approvals and Standards

The available test weights reference the following standards:

• ISO 9934-3:2015 – Non-destructive testing – Magnetic particle testing – Equipment.

• ASTM E709 – Standard Guide for Magnetic Particle Testing.

• ASTM E1444-16 – Standard Practice for Magnetic Particle Testing.

• ASME BPVC Section V – Nondestructive Examination.

Certification:

All standard test weights are supplied with relevant certification traceable to national standards.

Note: Referenced standards and lifting requirements depend on the test weight selected and the applicable revision of the inspection procedure. ASTM E1444-21 removed the previous yoke lifting requirements found in earlier editions.

Storage and Shelf Life

Calibrated test weights do not have a conventional consumable shelf life. However, their accuracy and suitability for inspection use depend on maintaining their physical condition and calibration status.

• Store in a clean, dry environment to minimise corrosion.

• Keep test weights protected from impact, dropping and unnecessary mechanical damage.

• Avoid damaging or deforming the lifting handle.

• Keep calibration certificates associated with their respective test weights.

• Inspect the weight and lifting handle regularly for signs of wear, corrosion or damage.

• Maintain calibration in accordance with the applicable quality management system and customer requirements.

• Do not use damaged test weights for formal equipment verification.