Rosemount P300, Инструкция по установке и эксплуатации

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Appendix
A-1
A Calibration
OVERVIEW Calibration of the Rosemount Model P300 Pressure Validator should be
performed periodically to ensure that the validator stays within
specifications.
The calibration interval will depend on usage. However, for the
validator to remain within the quoted accuracy, it is suggested that its
calibration be checked at 90-day intervals.
NOTE
The use of a Class A compensated dead-weight tester is essential.
All tests should be carried out in a controlled environment by a
trained person.
The manufacturer offers a comprehensive and, if required, NAMA-
accredited calibration service.
SAFETY MESSAGES Procedures and instructions in this section may require special
precautions to ensure the safety of the personnel performing the
operations. Information that raises potential safety issues is indicated
by a warning symbol ( ). Refer to the following safety messages before
performing an operation preceded by this symbol.
Warnings ( )
Electrical shock can result in death or serious injury.
• Avoid contact with the leads and the terminals.
Validator housing could explode causing death or serious injury.
• This Validator is not to be connected to a process.
• External pressure source’s pressures should not exceed the Validator’s Burst
Pressure.
Exposure to pressure leaks can cause death or serious injury.
• Ensure that all pipes and fittings are correctly rated for the operating pressure
and temperature.
• Remove pressure and vent the transmitter, validator, and all lines before
disconnecting any pressure lines.
Remove pressure and open the vent valve before switching the pressure/vacuum
output, if the validator is equipped with one.