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Summary of Contents for Ashcroft a4a
- Page 1 Ashcroft Model A4A Precision Pressure Gauge Installation and Maintenance Manual I&M002-10126-02/14...
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Page 3: Table Of Contents
PURPOSE AND SCOPE OF MANUAL where temperatures are in excess of design rat- This manual is provided by Ashcroft Inc. to guide users of ings may result in loss of accuracy and failure. the Ashcroft Model A4A precision pressure gauge in:... -
Page 4: Product Description
A4A gauge takes 15 days to complete and produces the most highly developed pressure sensing element of its type. In the A4A gauge this tube is combined with a move- ment which incorporates precision brass gears and minia- ture stainless steel ball bearings to provide the most accu- rate conversion of tip travel to pointer movement possible. - Page 5 2.3.2 BOURDON TUBE SYSTEM Where specified, gauges have been equipped with auto- The Ashcroft A4A Bourdon tube is a product of more than matic thermal compensator, slotted link for protection 40 years of intensive, continuous research. The “unitized” against sudden pressure release, peak load indicating one-piece tube system is an outstanding example of mod- pointers or other optional features.
- Page 6 The solid front case provides a single rigid support for all moving parts of the gauge, maintaining critical alignment under all conditions. No significant calibration error will occur in the Ashcroft A4A gauge, as a result of distortion or shifting of supporting parts or components during the instal- lation process.
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Page 7: Incoming Inspection
Tip Piece Adjustment Special Ranges The unique quadrant and slide design of the Ashcroft A4A The Ashcroft A4A precision pressure gauge is available in a adjustable tip piece permits simple and accurate adjustment wide variety of standard pressure ranges from 15 through of the angular relationship between the connecting link and 100,000 psi. -
Page 8: Installation
PRESSURE (ABSOLUTE GAUGES ONLY) INSTALLATION The dial adjuster is also used to allow an A4A gauge to sim- *** WARNING *** ulate the performance of an absolute pressure gauge. To do this the gauge operator must determine the prevailing baro-... -
Page 9: Calibration
Ashcroft A4A. Corrections for local gravity stainless steel blow out disc. effects, air buoyancy and temperature should be applied to... - Page 10 Figure 5.1 Model “A4A”...
- Page 11 Figure 5.2...
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Page 12: Guide To Pointer Replacement
(Bourdon tube) under different pressures. With linearity established, fine readjustment may be made Prior to correction, an Ashcroft A4A precision pressure in range and linearity re-checked to bring both adjustments gauge will generally, in the first half of the scale, indicate a within the desired limits of accuracy. -
Page 13: Specifications
Ashcroft A4A Gauges with Linear Dials If the gauge is adjusted considerably or if movement parts are replaced, it will probably be impossible to re-use the -All that are other than above existing dial, and a new dial will have to be plotted as part of -All gauges originally equipped with counter weighted pointers the calibration. -
Page 14: Warranty & Shipping Instructions
External Dial Adjuster. WARRANTY AND SHIPPING INSTRUCTIONS WARRANTY AND LIMITATION OF LIABILITY All Ashcroft A4A products and parts carry a warranty against defective material and workmanship for a period of one (1) year from the date of shipment. - Page 15 APPENDIX A STANDARD GRADUATION TABLES 6˝ A4A & 8 ⁄ ˝ A4A 12˝ A4A 16˝ A4A Scale Total Total Total Scale for All fNumber Value fNumber Value fNumber Value for All Units of Division Numeral Division Numeral Division Numeral Units of...
- Page 16 APPENDIX B STANDARD RANGE SELECTION Inches Mercury PSIG STANDARD STANDARD STANDARD RANGE BOURDON TUBE BOURDON TUBE STANDARD RANGE PSIG INCHES MERCURY MATERIAL** MATERIAL** 0-30 0-12/3-15 0-40 0-15 BERYLLIUM BERYLLIUM COPPER 0-50 0-20 COPPER 0-60 0-25 0-75 0-30 0-100 0-40 0-125 0-50 0-150 0-60...
- Page 17 APPENDIX B STANDARD METRIC RANGES Metric STANDARD STANDARD RANGE BOURDON TUBE MILLIMETERS MERCURY MATERIAL** 0-760 BERYLLIUM 0-1000 COPPER 0-1250 0-1500 0-2500 AISI 403 0-3000 STAIN. STEEL 0-4000 0-5000 kg/cm kp/cm 0.2-1 – – 0-100 – BERYLLIUM COPPER 0-1.6 0-160 – 0-200 –...
- Page 18 APPENDIX C GAUGE CASE DIMENSIONS Model A4A Dim. Size Units ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ 6˝ mm 200 177.8 165.1 177.8 50.8 47.6 31.8 117.5 109.5 82.3 34.9 98.4 15.9 62.7 in. 10 ⁄...
- Page 20 Ashcroft Inc. Sales and Customer Service Locations World Headquarters U.S.A. Ashcroft Inc.250 East Main Street Stratford, CT 06614-5145 U.S.A. Tel: (203) 378-8281 Fax: (203) 385-0408 (Domestic) Fax: (203) 385-0357 (International) email: heise@ashcroft.com www.ashcroft.com Visit our web site www.heise.com All specifications are subject to change without notice.
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