1.8 Safety Summary and Symbols 9
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1.8 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 user
failure to comply with these requirements.
The Model 425 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 Environments with conducted RF of 1 V
rms
or EM fields of 1 V/m can cause a shift
in field readings up to 10% and monitor output up to 5%
D Power supply voltage fluctuations not to exceed ±10% of the nominal voltage
D Overvoltage category II
D Pollution degree 2
Ground the Instrument
To minimize shock hazard, the instrument is equipped with a 3-conductor AC power
cable. Plug the power cable into an approved 3-contact electrical outlet or use a
3-contact adapter with the grounding wire (green) firmly connected to an electrical
ground (safety ground) at the power outlet. The power jack and mating plug of the
power cable meet Underwriters Laboratories (UL) and International Electrotechnical
Commission (IEC) safety standards.
Ventilation
The instrument has ventilation holes in its side covers. Do not block these holes when
the instrument is operating.
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.
Cleaning
Do not submerge instrument. Clean only with a damp cloth and mild detergent. Exte-
rior only.
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