SPECTRO-UV YK-1 AC Yoke Magnetic Inspection Tool Instruction Manual

: October 30, 2023
: SPECTRO-UV

Table of Contents

SPECTRO-UV YK-1 AC Yoke Magnetic Inspection Tool
Product Information
Technical Specifications
Product Important Safety Instructions
Product Maintenance
Product Limited Warranty
Product Usage Instructions
Product Contact Information
INTRODUCTION
IMPORTANT SAFETY INSTRUCTIONS
TECHNICAL SPECIFICATIONS
OPERATION
MAINTENANCE
LIMITED WARRANTY
Contact
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

SPECTRO-UV YK-1 AC Yoke Magnetic Inspection Tool

Product Information

HANDHELD MAGNETIC PARTICLE INSPECTION AC YOKE Part No. YK-1

The HANDHELD MAGNETIC PARTICLE INSPECTION AC YOKE Part No. YK-1 is a portable device used for non-destructive testing to detect surface and slightly subsurface discontinuities in ferromagnetic materials. The device uses AC magnetic fields to magnetize the material and then applies iron oxide or other magnetic particles as a contrasting agent to visualize any cracks, laps, seams, inclusions, or other defects.

Technical Specifications

Width Between Legs: N/A
Weight: N/A
Voltage: AC
Frequency: 50/60 Hz
Current: N/A
Lift: N/A
Pole Spacing: N/A
Cord Length: N/A

Product Important Safety Instructions

Before using the device, read all instructions carefully. The device should only be used by trained professionals who are familiar with the principles of magnetic particle inspection. Always wear appropriate personal protective equipment, including eye protection, gloves, and clothing that covers exposed skin. Keep the device away from moisture, excessive heat, and corrosive materials. Do not use the device if it appears to be damaged or inoperable.

Product Maintenance

The device should be inspected regularly for signs of wear and tear, including cracks, breaks, or frayed cords. If any damage is detected, the device should be repaired or replaced before further use. The device should also be cleaned after each use to remove any excess magnetic particles and debris. Store the device in a clean, dry location away from other equipment to prevent damage.

Product Limited Warranty

Note

The device comes with a limited warranty that covers defects in materials and workmanship for a specified period of time.
Contact the manufacturer for more information about the warranty and any limitations or exclusions that may apply.

Product Usage Instructions

Ensure that the device is in good working condition and that all personal protective equipment is worn.
Clean the surface of the material to be inspected to remove any debris or contaminants.
Place the device in the desired location and connect it to a power source.
Apply a thin layer of magnetic particles to the surface of the material being inspected.
Activate the device and move it along the surface of the material in a systematic pattern, such as a zigzag or circular motion.
Inspect the surface of the material for any indications of cracks, laps, seams, inclusions, or other defects.
If any indications are found, mark the location and size of the defect for further evaluation.
Clean the surface of the material to remove any excess magnetic particles and debris.
Store the device in a clean, dry location away from other equipment to prevent damage.

Product Contact Information

For more information about the device, technical specifications, or warranty, contact the manufacturer at:

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*  **Phone:** 1.888.610.7664
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- Email: sales@calcert.com
- Website: www.calcert.com

INTRODUCTION

The YK Series Yoke is classified as a Standard AC Yoke, which induces a magnetic field into the ferrous material being tested. These devices should be used within the parameters set by the operational specifications within this guide. This Yoke (YK-1) is ideal for magnetic particle inspection and other specialized applications.

IMPORTANT SAFETY INSTRUCTIONS

Read All Instructions

Product contains strong magnetic fields. DO NOT USE this product if you have any implanted medical devices, metallic implants, pregnant or for more than 8 hours per day
Do not hold the pushbutton microswitch when plugging the AC Yoke into power.
The pushbutton microswitch has no grounding provisions, the operator must take care while performing wet method inspection.
To avoid operator shocks during wet method inspection the slip in switch cover must be regularly removed to clean.
It is recommended that the operator does not keep the Yoke on for more than 5 minutes at a time and sufficient cooling time is recommended during extended use.
While performing maintenance take care not to touch encapsulent with your soldering iron.

TECHNICAL SPECIFICATIONS

Width Between Legs ………………………………………………………………………. .4.4″ (11.17cm)
Weight ………………………………………………………………………….. 7.2 Lbs (3.3 kg)
Voltage …………………………………………………………………………………….. 115 VAC nominal
Frequency ………………….. ……………………………………………………………………………… 60Hz
Current ………………………………………………………………………………………………… 4.0Amps
Lift ………………………………………………………………………………. 10 Lbs. (4.6 kg) minimum
Pole Spacing ………………………………………………………………………………… 0 to 11″ (28cm)
Cord Length ………………………………………………………………………………………. 8 ft (2.5 m)

OPERATION

Push Button Switch: While depressed, the switch delivers AC power to the coil encapsulated in the Yoke housing.
Operational Parameters: (Duty Cycle) is set to avoid damage to the internal coil or the output module and must be observed.
Typical AC Operation: 5 to 15 seconds on while applying inspection media, followed by 5 to 15 seconds off for inspection and repositioning the Yoke to the target area.
Typical DC Operation: When a YK-Series Yoke is connected to a 6 or 12 volt battery for intermittent use, the Yoke core will quickly produce heat. Battery power is damaging to the switch contacts and will drastically affect their service life. The Yoke operating time should be limited to seconds and not minutes, and the number of On/Off cycles should be limited. Spectro-UV recommends using a 6 Volt DC supply, as the unit will lift 50 Pounds (over 100 Pounds at 12 Volts). and less heat is produced in the voke core.
“AC Field Characteristics: AC magnetic fields are sensitive to surface, and near-surface defects due to the ‘Skin Effect as the magnetic field travels from one pole piece to another. The inspection media (dry powder or wet method particles) tends to migrate toward interruptions (or defects) in the magnetic field. The direction and intensity of an AC field, by its nature, alternates can cause high particle mobility; therefore, imperfections tend to be revealed immediately when the media is applied.
DC Field Characteristics: The magnetic field produced with a battery is stronger than an AC field and tends to penetrate the workpiece more deeply; however, DC is still sensitive to surface defects. Inspection media tends to adhere to the entire target area of the workpiece due to the lack of particle mobility. Therefore, the operator needs to be careful applying inspection media and may need to be ‘blown off’ the target area to reveal an indication fully.
Demagnetization: Small parts may be demagnetized by positioning the contact surfaces of the pole pieces together, activating an AC field, and passing the part through the opening formed between the legs and Yoke housing. Larger work pieces can be demagnetized by placing the Yoke on the surface similarly as used during inspection, activating an AC field, and pulling the Yoke off the surface. The workpiece can be tested with a magnetic field indicator to ensure it is fully demagnetized.
AC Yoke Operation: Position the pole pieces (feet) on the workpiece. The area between the pole pieces is your target area, the field will expose defects that are transverse to the centerline between the pole pieces. The pole pieces should be positioned to maximize contact surface on the workpiece. The Yoke is then energized by pressing the push button switch, and magnetic particles are applied. Dry method particles are dusted between the pole pieces and over the target area, while wet method particles are sprayed similarly. The target area is then inspected visually for a collection of particles around defects. A black light is used to aid visual inspection 21112. 17.

If the specific direction of defects is unknown, rotate the Yoke through 90° and repeat the inspection of the target area. The YK-Series Yokes produce a standard amount of field blow as other AC Yokes. Field blow is a collection of inspection media between the pole pieces, transverse to the centerline between the pole pieces, and may cause masking of indications. Field blow can be minimized by extending the pole pieces farther apart; if workpiece configuration does not permit ex-tending pole pieces, reduce the contact area of the pole pieces on the workpiece.

MAINTENANCE

After extended use, the Yoke should be cleaned with a mild soap solution and thoroughly dried. The unit should be visually inspected for any damage that could cause harm to the operator or the material being inspected. Particular attention should be paid to the push button switch cover to ensure it is fully inserted into the groove cast in the switch cavity. The most frequent maintenance issue with any MPI Yoke is the power plug, power cord, and end cap/cord protector. Attention should be paid when inspecting these items to ensure they appear in a good state of repair before performing maintenance, cleaning, or repositioning the end cap. The Yoke should be disconnected from any power source, with safe industrial practices employed. Any potential problems to these assemblies must be reported to the Distributor or Spectro-UV for instructions on corrective action. Whether industrial specifications are being observed or not, the Yoke should be tested periodically to ensure it continues to lift the specified amount of weight. If the unit fails such a test, first inspect the pole pieces to ensure they fully contact the test weight. If the unit continues to fail, contact the Distributor or Spectro-UV for instructions on corrective action.
Wiring: When installing an AC power plug onto the AWG 18-3 power cord the following is the identity of the 3 color coded conductors; Green – Ground / White – Neutral / Black – Live. Care must be taken to ensure the proper installation of an AC power plug. Any warranty is void if an AC plug is not installed before use.
Pull Test / Calibration: When performing a 10 Pound (4.6Kg) Pull Test, ensure the contact feet are flat as possible to the pull test bar, which provides as much magnetic attraction as possible. If a Yoke fails a pull test, it should be sent to Spectro-UV for contact foot dressing.
Slip In Switch Cover Replacement: To remove the slip in switch cover, pinch the cover and pull out the cover is designed to fit into the cast groove in only one direction; bend the cover longitudinally, and slip the top of the cover into the grove. Use a small screwdriver to help the bottom of the cover into the groove after the top is in place
Push Button Microswitch Replacement: Push button microswitches fail periodically depending on the current draw or environmental/service conditions due to an are that occurs when the switch is released. Remove the switch cover, using a blunt chisel or screwdriver and a hammer, break the plastic switch housing and remove the debris. 2 tabs/contacts will be left,using a small pair of pliers, hold the tab, and apply heat with your Soldering Iron. The tab is then easily removed, and the core wires are pre-tined. Position the new switch into the switch cavity, and press firmly on it. Finally, replace the switch cover.

LIMITED WARRANTY

The warranty policy for the YK-Series Yoke is provided on the Certificate of Limited Warranty enclosed separately with each unit.

NOTE

For assistance of any kind, please contact the Customer Service Department at Spectro- UV. Give the model and serial numbers of the unit and the date of purchase.
The Serial Number is located on the name plate and engraved on the upper hinge of the rear leg.