W-FI Guide
1
26509
Township
Road
543
Phone:
(780)
459-6720
Sturgeon
County,
Alberta
Fax:
(780)
459-7837
T8t
1M1
Canada
E-mail:
Web: westerninstruments.com
W-FI Field Indicators (Magnetometers)
Western Instruments manufactures 3 models of Disposable Field Indicators, which
provide readings in
Gauss
;
1. W-FI-10 Intended to be used for Demagnetization and are calibrated during
manufacture in a Homogeneous Field (
Helmholtz Coil +/- 10 Gauss
).
2. W-FI-20 Intended to check residual fields on small parts, and are calibrated during
manufacture for a Homogeneous Field (
Helmholtz Coil +/- 20 Gauss
).
3. W-FI-50 Intended to check residual fields on heavy parts, and calibrated during
manufacture for a Homogeneous Field (
Helmholtz Coil +/- 50 Gauss
).
The Certification Decal, illustrated below, is affixed to the back of every W-FI, and the
date of shipment is etched onto the decal. The Certification Decal reads as follows;
"This Magnetic Field Indicator (Magnetometer), as outlined in the
ASNT
Handbook (2
nd
Edition, Volume 6) and
Defined in ASTM E 1316, is
designed to measure the Relative Intensity of a Magnetic Field (measured
in
Gauss
) before or after Magnetic Particle Inspection. At the time of
shipping __/__ /__, the accuracy of this W-FI was confirmed to be within
+/-1 Gauss or 5% of the scale valve, whichever is greater."
A magnetic field of under 10 Gauss is typically not strong enough for Magnetic Particle
Inspection (MPI), thus the W-FI-10 is used to ensure a workpiece is demagnetized after
testing and before further processing. A magnetic field, for MPI, should be
E s t a b l i s h e d 1 9 6 5
W-FI-10
W-FI-20
W-FI-50
March, 2011
