User Guide

MAGNETISM DETECTOR
DET- 432 INSTRUCTIONS
Magnetic Analysis Corporation
CALIBRATION
Magnetism Detectors are calibrated prior to shipment, as signified by the sticker applied and initialed by a member of
MAC’s Final Assembly & Test Department. Calibration of a level +/- 1 gauss at 10 gauss is performed using a cali-
braiton fixture that has, in turn, been calibrated with a gauss meter calibrated with standards traceable to N.I.S.T.
requirements.
Calibration Certificates are available upon request at time of order. Additional Charges Apply.
MAC’s Magnetism Detector is a convenient, hand held
meter used to determine the approximate degree of
residual magnetism in ferrous material.
Applications include checking bar stock, tubing or parts
where magnetism may interfere with subsequent
machining or handling operations, or with the end use of
the product. The unit can also be used to check products
such as tools, aircraft parts, or any product where
magnetism could be a problem. It is not suitable, however,
for measuring the strength of electro-magnetic fields
created by AC power lines.
The meter has been tested before shipment and its
accuracy, from one to another should vary no more than
approximately 10%. For those applications where the
sensitivity of the instrument, as supplied, is of significance,
the full-scale reading (+/-20) is obtained when the meter is
subjected to a field whose known intensity is 20 gauss.
CHECKING BARSTOCK & TUBING
To test for magnetism in bar stock or tubing, place the
base of the needle squarely against the end of a separate
bar or tube that you wish to check. The needle indicator
will move to a point on the scale that represents the
strength of the magnetic field (in gauss) of the material.
The meter scale reads 20 units on each side of the zero
center point. This arrangement allows ready identification
of the field’s polarity, as well as the level of the magnetic
field.
Generally, for bar stock or tubing, a reading of ten or less
on the meter scale is considered acceptable. However,
individual requirements or specifications may vary, and the
user may have to determine the acceptable level of
magnetism for their specific application.
Please refer to the cautionary notes shown below.
CAUTIONARY NOTES
Separate the bar or tube from the bundle before testing
Do not attempt to test while the bar or tube is in a bundle or group of pieces as the indication will be affected by the
residual magnetism of the bundle and you will not get a true reading for the individual piece.
Use a spacer when testing highly magnetized material
If the piece you are checking is highly magnetized, the indicator needle may move to the extreme end of the scale, even
before the meter is in contact with the material. If this occurs, do not attempt to place the meter against the material as
this may overdrive the needle and damage the meter. The recommended practice in this case is to use a spacer, which
may consist of a block of wood, or other non-magnetic material, between the detector and the material being checked.
Handle with care
The magnetism detector may be damaged if not handled with reasonable care. Do not drop, or subject it to severe
mechanical vibration. Avoid strong magnetic fields, whether alternating or direct, such as those produced by large
horsepower motors, generators, or welding equipment. Improper handling may cause the instrument’s permanent
magnet to become partially or completely demagnetized. Partial demagnetization can result in an increase in sensitivity.
Complete demagnetization makes the meter inoperable with the needle deflecting in a random manner, and not
returning to the mid-scale zero in the absence of a magnetic field.
Magnetic Analysis Corp.
103 Fairview Park Drive, Elmsford, NY, 10523-1544 Tel: 800-4NDT-MAC Fax: [phone]
www.mac-ndt.com email: [e-mail] Tel: [phone] November, 2016
MAC is a registered trademark of Magnetic Analysis Corp.