Magnetic Particle Inspection (MPI) Equipment



Lightweight NDT Yoke

The JAYMI is the next generation of yoke from Johnson & Allen - Developed to be light weight but powerful, efficient and robust. Previously customers have had to compromise on either weight, durability or power when choosing a yoke. Overcoming these limitations was the design philosophy behind the JAYMI.

The core is housed within an ergonomic injection moulded shell made from an abrasion and chemical resistant plastic and the yoke incorporates a number of rubber gaskets to retard fluid ingress. The energising micro switch is trigger mounted with a rubber membrane making it easy to press and giving a user friendly action to it.

Available in 230V and 110V versions.

Replacement parts also available - Including pairs of complete leg sections, pairs of just the feet sections, micro switches, rubber membranes etc.

Quality UK Construction

The JAYMI is manufactured in-house and fitted with a self-resetting thermal cut-out to prevent burnout from misuse (like all Johnson & Allen yokes) and the feet sections include steel 'guard plates’ on both sides to reduce long term lamination splaying. This product is also recyclable and complies with the EU WEEE Directive for disposal of electrical waste products.

The JAYMI is supplied lift tested with certificate of conformity and in a heavy canvas bag as standard.

Handheld Portable AC Electromagnet

The 110V JAYMI is also available as a JAYMI-PAC for customers who require battery operated yokes.

See the JAY-PAC product listing for more information.

The JAYMI is ideal for portable inspections and rope work due to being light weight and its low current draw meaning portable yoke battery packs will last longer per charge.

Product Data

Model JAYMI - 230V JAYMI - 110V
Input Supply
230VAC @ 1.3A 110VAC @ 2.3A
Voltage Regulation ±10% of nominal ±10% of nominal
Frequency 50 / 60 Hz 50 / 60 Hz
Waveform AC AC
Switch Position Trigger Mounted Trigger Mounted
Recommended Pole Spacing 135mm 135mm
Pole Spacing Range 60 to 210mm 60 to 210mm
Leg / Pole Contact Size 20 x 20mm 20 x 20mm
Duty Cycle 25% - Max. ON time 30 seconds 25% - Max. ON time 30 seconds
Lift Strength
(100 to 150mm spacing)
> 4.5 kg
(Equivalent to 44 N)
> 4.5 kg
(Equivalent to 44 N)
Magnetic Field* > 2.5 kA/m
@ 6 inch / 152mm spacing
> 2.5 kA/m
@ 6 inch / 152mm spacing
Dimensions (LWH) 260 x 50 x 190mm 260 x 50 x 190mm
Weight 2.30 kg 2.30 kg
Ingress Protection IP56 IP56
Mains Lead 3 Meters 3 Meters
Plug Type ‘C’ Form - 16A ‘C’ Form - 16A
Warranty 12 Months 12 Months
Conformity UKCA

Specification Compliance

(List is not exhaustive)

ISO 9934: 2016
ASTM E 1444-22a
ASTM E 709-21
ASTM E3024-22a
ISO 9934: 2016
ASTM E 1444-22a
ASTM E 709-21
ASTM E3024-22a
Powerbelt Compatibility No Yes


*Note: The tangential extraneous magnetic field will vary depending on whether the yoke is energized in free space (unloaded) or when in contact with a part (loaded). Material properties and pole spacing will also alter the magnetic field. For this reason operators should not rely on field measurements alone as a performance check and should verify the lifting strength of the yoke with a 4.5kg test weight and use a QQI shim or flux indicator strip for evaluation before undertaking inspection.

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