8 | PSR1A/PSR4A POWER SUPPLY AND PRESSURE/FLOW READOUT
MKS P/N 20068380-001 Rev A
guarantee that other components of the vacuum system are maintained at earth ground. Connecting
the power cable only to a properly grounded outlet is necessary but not sufficient for safe operation of a
vacuum system with this or any similar high voltage producing product. Verify that the vacuum port to
which sensors are mounted is electrically grounded.
Some of the sensors operated by the PSR1A/PSR4A Controller are highly gas sensitive and were
calibrated with a specific gas. When used with other gases, the true pressure could be much higher
than the indicated pressure. Read and understand the information provided in this manual about setting
up, installing, and operating each sensor type with different gases.
DO NOT SUBSTITUTE PARTS OR MODIFY THE 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.
USE PROPER ELECTRICAL FITTINGS
Dangerous voltages are contained within this instrument. All electrical fittings and cables must be of the
type specified, and in good condition. All electrical fittings must be properly connected and grounded.
High voltage is present in the cable and a Cold Cathode sensor when the Controller is turned on.
USE PROPER ELECTRICAL POWER SOURCE
This product is intended to operate from a power source that applies a voltage between the supply
conductors, or between either of the supply conductors and ground, not more than that specified in the
manual.
USE PROPER ELECTRICAL FUSE
Only use a fuse of the type, voltage rating, and current rating specified for your product.
DO NOT OPERATE IN EXPLOSIVE ENVIRONMENT.
To avoid explosion, do not operate this product in an explosive environment unless it has been
specially certified for such operation.
SERVICE BY QUALIFIED PERSONNEL ONLY
Operating personnel must not remove instrument covers. Component replacement and internal
adjustments must only be made by qualified service personnel.
USE PROPER ELECTRICAL POWER CORD
Only use a power cord that is in good condition and that meets the input power requirements specified
in the manual.
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