1.12 Safety Summary and Symbols
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1.12 Safety
Summary and
Symbols
Observe these general safety precautions during all phases of instrument operation,
service, and repair. Failure to comply with these precautions or with specific warn-
ings elsewhere in this manual violates safety standards of design, manufacture, and
intended instrument use. Lake Shore Cryotronics, Inc. assumes no liability for Cus-
tomer failure to comply with these requirements.
The Model 648 protects the operator and surrounding area from electric shock or
burn, mechanical hazards, excessive temperature, and spread of fire from the instru-
ment. Environmental conditions outside of the conditions below may pose a hazard
to the operator and surrounding area.
D
Indoor use
D
Altitude to 2000 m
D
Temperature for safe operation: 5 °C to 40 °C
D
Maximum relative humidity: 80% for temperature up to 31 °C decreasing
linearly to 50% at 40 °C
D
Power supply voltage fluctuations not to exceed ±10% of the nominal voltage
D
Overvoltage category II
D
Pollution degree 2
Power and Ground Connections
This instrument must be connected to a dedicated three-phase power circuit with
proper size of circuit breaker (refer to Chapter 3). The connection installation must be
performed by a licensed electrician. Verify that the unit has been configured for the
correct input voltage. The neutral line, if available, is not used. Power to the unit must
be hard-wired, and never connected using a detachable cord. In all cases the correct
size wire must be chosen for the current drawn, working voltage, and the length of
cable used. To minimize shock hazard, the electrical ground (safety ground) lead must
be connected. Power wiring must comply with electrical codes of the locality in which
the unit is installed.
Ventilation
The instrument has an exhaust fan and ventilation holes on the rear panel. Do not
block these holes when the instrument is operating. Provide at least 25 mm (1 in) of
air space on each side for ventilation.
Do Not Operate in an Explosive Atmosphere
Do not operate the instrument in the presence of flammable gases or fumes. Opera-
tion of any electrical instrument in such an environment constitutes a definite safety
hazard.
Keep Away from Live Circuits
Operating personnel must not remove instrument covers. Refer component replace-
ment and internal adjustments to qualified maintenance personnel. Do not replace
components with power cable connected. To avoid injuries, always disconnect power
and discharge circuits before touching them.
Do Not Substitute Parts or Modify Instrument
Do not install substitute parts or perform any unauthorized modification to the
instrument. Return the instrument to an authorized Lake Shore Cryotronics, Inc. rep-
resentative for service and repair to ensure that safety features are maintained.
Do not Use the Equipment In a Manner Not Specified
If the equipment is used in a manner not specified by the manufacturer, the safety
protection provided by the equipment may be impaired.
