GMW 3470, User Manual

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Section 2
WARNINGS
REFER TO WARNINGS BELOW BEFORE OPERATING ELECTROMAGNET
1 Personnel Safety
In operation the magnet fringing field is in excess of 0.5mT (5G). This can cause malfunctioning
of heart pacemakers and other medical implants. We recommend that the fringing field should be
mapped and warning signs be placed outside the 0.5mT (5G) contour. Entry to this region should
be restricted to qualified personnel.
2 Clamp Bolts
Before operation always ensure that both clamp bolts (item 6 on drawing 11801470) are firmly
tightened. Ensure that the poles are arranged so that that pole gap is approximately centered
between the coils.
3 Ferromagnetic Objects
During operation the magnet exerts strong magnetic attraction towards ferromagnetic objects in the
near vicinity of its pole gap or coils. Loose objects can be accelerated to sufficient velocity to
cause severe personnel injury or damage to the coils or precision pole faces if struck. Keep
ferromagnetic tools clear!
4 Arcing
This magnet stores considerable energy in its field during operation. Do not disconnect any current
lead while under load or the magnetic field energy will be discharged across the interruption
causing hazardous arcing.
5 Coil Hot Resistance
Do not exceed the maximum coil hot resistance given in the specifications or coil overheating and
possible damage may occur.
6 Interlocks
These should always be connected if the magnet is operated unattended, to avoid the possibility of
coil overheating caused by excessive power dissipation or inadequate cooling.
7 Watches, Credit Cards, and Magnetic Disks
Do not move magnetically sensitive items into the close vicinity of the magnet. Even some anti-
magnetic watches can be damaged when placed in close proximity to the pole gaps during
operation. Credit cards, and magnetic disks are affected by magnetic fields as low as 0.5mT (5G).
Depending on the previous operating field and the pole gap, the remanent field in the gap can be in
excess of 50G (5mT) with the magnet power supply off or disconnected.
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