7 | PSR1A/PSR4A POWER SUPPLY AND PRESSURE/FLOW READOUT
MKS P/N 20068380-001 Rev A
Both Direct and Alternating
Current
IEC 417, No. 5033-a
Class II Equipment
IEC 417, No. 5172-a
Three Phase Alternating
Current
IEC 617-2, No. 020206
Caution (refer to accompanying
documents)
ISO 3864, No. B.3.1
Caution, Risk of
Electric Shock
ISO 3864, No. B.3.6
Caution Hot Surface
IEC 417, No. 5041
2.3 Safety Procedures and Precautions
Observe the following general safety precautions during all phase of operation of this instrument.
Failure to comply with these precautions or with specific warnings elsewhere in this manual violates
safety standards of intended use of the instrument and may impair the protection provided by the
equipment. MKS Instruments, Inc. assumes no liability for the customer’s failure to comply with these
requirements.
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 MKS Calibration and Service Center for service and repair to ensure that all safety
features are maintained.
SERVICE BY QUALIFIED PERSONNEL ONLY
Operating personnel must not remove instrument covers. Component replacement and internal
adjustments must be made by qualified service personnel only.
PROPERLY GROUND THE CONTROLLER
This product is grounded through the grounding conductor of the power cord. To avoid electrical shock,
plug the power cord into a properly wired receptacle before connecting it to the product input terminals.
A protective ground connection through the grounding conductor in the power cord is essential for safe
operation.
Upon loss of the protective-ground connection, all accessible conductive parts (including knobs and
controls that may appear to be insulating) can render an electrical shock.
All components of a vacuum system used with this or any similar high voltage product must be
maintained at earth ground for safe operation. Be aware, however, that grounding this product does not
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