Lakeshore Learning Materials 647 User Manual

Page 9

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Lake Shore Model 647 Magnet Power Supply User’s Manual

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vii

MAGNET QUENCHES
For protection during a magnet quench, fit the dewar with pressure relief valves of sufficient size and

pressure rating to allow the helium gas to escape and to prevent excessive pressure in the dewar. Operating

a magnet in a dewar without proper pressure relief is dangerous and possibly life-threatening. The magnet

may transfer tremendous energy to the cryogen during a quench. Consult both the magnet and dewar

manufacturers to check pressure relief valve sufficiency.

DANGEROUS VOLTAGES
High voltages are present inside the MPS. Never attempt to service the MPS. Refer all service to qualified

personnel. There are no user-serviceable parts inside the MPS.

The MPS current output terminals may be dangerous. Although MPS output voltage is limited to ±40 VDC, a

catastrophic failure inside the MPS could pass lethal voltages to the output terminals. Do not touch the

terminals during MPS operation.

BEFORE YOU OPERATE THE EQUIPMENT
Train personnel in proper emergency measures such as electrical power shut off, fire department notification,

fire extinguishing, and personnel and records evacuation. Here is a list of suggested personnel safety

considerations:

Ground Fault Interrupter (GFI) AC circuits

• Fire

Extinguisher

Magnetic Field Warnings

• Emergency

Lighting

Locate in the immediate vicinity fire extinguisher(s) that extinguish all three classes of fires: A, B, and C.

Class A is ordinary combustibles like wood, paper, rubber, many plastics, and other common materials that

burn easily. Class B is flammable liquids like gasoline, oil, and grease. Class C is energized electrical

equipment including wiring fuse boxes, circuit breakers, machinery, and appliances. Do not use chemical

extinguishers even though they are less expensive and cover all classes of fires. They may damage

electronic equipment. Use a Carbon Dioxide or Halon fire extinguisher.

During the planning stage, consult local experts, building authorities, and insurance underwriters on locating

and installing sprinkler heads, fire and smoke sensing devices, and other fire extinguishing equipment.

Even where not required by code, install some type of automatic, battery-operated emergency lighting in case

of power failure or fire.

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