Ashcroft a4a Руководство по установке и обслуживанию - Страница 3
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INDEX
Section Description
1.0
Scope
1.1
Safety Precautions
2.0
2.1
Theory of Operation
2.2
Pressure Types
2.3
Gauge Construction
3.0
3.1
Unpacking
3.2
4.0
Initial Operation
4.1
Bleeding The System
4.2
Zero, Tare or Barometric Setting
4.3
General Operating Considerations
5.0
5.1
Calibration Standards
5.2
Calibration Check
5.3
Recalibration Procedure
6.0
Pointer Replacement
6.1
7.0
7.1
Standard Specifications
8.0
Warranty & Shipping Instructions
8.1
Warranty & Limitation of Liability
8.2
Shipping Instructions
9.0
To Order An A4A Gauge
9.1
Information Necessary to Specify an A4A Gauge
APPENDICES
Appendix A-
Standard Graduation Table
Appendix B-
Standard Range Selection
Appendix C-
Gauge Dimensions
1.0
PURPOSE AND SCOPE OF MANUAL
This manual is provided by Ashcroft Inc. to guide users of
the Ashcroft Model A4A precision pressure gauge in:
(1)
Installation
(2)
Routine operations
The instructions in this manual are designed to be per-
formed by qualified instrument maintenance personnel.
Ashcroft Inc. does not recommend trouble-shooting or
repairs beyond the scope of this manual. Problems which
cannot be remedied by following the instructions in this
manual should be referred to the manufacturer.
For Additional Assistance
Contact Customer Service at:
Ashcroft Inc.
250 East Main Street
Stratford, CT 06614
Phone: (203) 378-8281
Fax: (203) 385-0402
1.1
SAFETY PRECAUTIONS
Bourdon tube pressure gauges must be selected and used
in accordance with recognized industry codes and safety
practices. This is necessary in order to avoid the possibility
of misuse or misapplication which could result in personal
injury or property damage. Personnel responsible for selec-
tion and installation should also be familiar with the safety
recommendations of ASME B40.1 that apply to elastic
pressure elements and their application in general and spe-
cific services. ASME B40.1 is available from:
ASME
345 47th Street
New York, NY 10017
The primary considerations in gauge selection are:
1.
Pressure
Select a range so that the maximum applied pres-
sure will never exceed the upper range limit.
ASME B40.1 recommends gauges be selected so
that normal operation will occur between 25-75%
of the full scale range of the gauge.
2.
Vibration
Excessive vibration could cause loosening of com-
ponents resulting in loss of instrument accuracy or
failure to provide valid data. Remote mounting can
often protect a gauge from damage due to vibration.
3.
Pulsation
Excessive pressure pulsation could result in fatigue
failure of the pressure element. Commercially avail-
able pressure snubbers can be used to protect a
gauge from damage due to pressure pulsation.
4.
Temperature
Operation of the instrument in an environment-
where temperatures are in excess of design rat-
ings may result in loss of accuracy and failure.
Optional temperature compensation is recom-
mended for gauges to be used in areas that are
not temperaturecontrolled.
5.
Process
Pressure boundary materials (Bourdon tube and
socket) must be resistant to the processmedia.
Failure to assure compatibility between the pres-
sure media and boundary materials may result in
pressure sensing element deterioration or failure.
Instrumentsused on high pressure gas or in poten-
tially hazardous service, such as oxygen, should
becarefully selected in accordance with the rec-
ommendations of ASME B40.1.
See also Section 3.2
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