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Figure 5.2

I&M002-10126 02-14 Ash A4A Dial Gauge_layout 2/19/14 10:43 AM Page 11

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Содержание a4a

Страница 1: ...1 Ashcroft Model A4A Precision Pressure Gauge Installation and Maintenance Manual I M002 10126 02 14 ...

Страница 2: ...2 ...

Страница 3: ...om 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 suc...

Страница 4: ...nt using ambient pressure as the reference point All readings taken with a vacuum gauge are negative The largest vacuum level achievable at any given time is the negative equiva lent of the prevailing barometric pressure at the start of the test cycle 2 0 PRODUCT DESCRIPTION THEORY OF OPERATION CONSTRUCTION The Ashcroft A4A is a mechanical pressure gauge This is a device that measures pressure via...

Страница 5: ...e protection is provided by this wall as pressure release will be directed out the back of the gauge away from the operator Blow Out Safety Back A light gauge stainless steel disc covering the entire back of the gauge case is spring loaded against a seal machined in the periphery of the case An abnormal rise of pressure within the gauge case causes this disc to flex out ward releasing the pressure...

Страница 6: ...ovement Connecting Link The Connecting Link transmits motion from the tip piece assembly to the sector slide of the movement 2 3 3 MOVEMENT ASSEMBL Y Integral Movement 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 distorti...

Страница 7: ...recision pressure gauge is available in a wide variety of standard pressure ranges from 15 through 100 000 psi A list of the standard ranges is provided in Appendix B Most any non standard pressure range between 15 and 100 000 psi or metric equivalent can be provided on a custom basis Thermal Compensator Patented The thermal compensator is comprised of a bimetallic bar which forms part of the link...

Страница 8: ...ipped with a bleeder valve flushing connector as an integral part of the Bourdon tube When operating the bleeder valve flushing connector sup port the free end of the Bourdon tube with fingers to prevent disengagement of the gear teeth or possible bending of the link or tip piece To operate the bleeder the valve is opened slightly and pressure applied to the gauge to force fluid through the tube a...

Страница 9: ... the gauge for several minutes and then release the pressure Re zero the gauge if necessary Using an appropriate pressure standard generate pressures and take readings at zero to full scale in 10 increments both upscale and downscale If the error exceeds the amount permissible for the intended service follow the recalibration procedure Section 5 3 5 3 RECALIBRATION PROCEDURE Prior to beginning cal...

Страница 10: ...10 Model A4A Figure 5 1 ...

Страница 11: ...11 Figure 5 2 ...

Страница 12: ...ressure and compare the down scale reading to the upscale reading If the second reading is higher than the first it may be caused by either hysteresis or friction With dead weight still at one half load tap the gauge gently If the pointer returns to substantially the original one half load reading the differ ence in readings was caused by friction If the amount of tap is not excessive it might be ...

Страница 13: ...always require non linear dials 2 Gauges with 6 dials do not have pointers with half moon tails Instead the tail end of the pointer is wider than the indicating end The counterbalance offset is accomplished by trimming the tail end of the pointer until the desired coun terbalance effect is achieved The following general rules can be used to help determine whether a gauge has a linear or non linear...

Страница 14: ... possible damage in shipment If possible using original packaging provided with the A4A from Ashcroft Inc Ship Package To Ashcroft Inc 250 East Main Street Stratford CT 06614 USA Attention Heise Service Center IMPORTANT Obtain written authorization in order to return instruments that have been used with or in contact with corrosive or otherwise hazardous materials such as mercury radioactive solut...

Страница 15: ...ber Value of per Division Numeral Divisions Division Pattern Value 1000 001 1 5 05 800 002 1 5 1 1000 002 1 5 1 1000 0025 1 4 1 600 005 1 2 2 800 005 1 2 2 1000 005 1 2 2 600 01 1 5 2 750 01 1 5 5 1000 01 1 5 5 750 02 1 5 1 800 02 1 5 1 1000 02 1 5 1 1000 025 1 4 1 600 05 1 2 2 800 05 1 2 2 1000 05 1 2 2 600 1 1 5 2 750 1 1 5 5 1000 1 1 5 5 750 2 1 5 10 800 2 1 5 10 1000 2 1 5 10 1000 25 1 4 10 60...

Страница 16: ...CC CM CMM MATERIAL 0 30 0 40 0 50 0 60 0 75 0 100 0 125 0 150 0 200 0 250 0 300 0 400 0 500 0 600 0 750 0 1000 Vacuum BERYLLIUM COPPER J 30 to 0 Compound VAC PRESSURE CC CM CMM 15 Hg 15 Hg 30 Hg 30 Hg AISI 403 30 Hg 60 Hg STAIN STEEL 30 Hg 100 Hg V 30 Hg 150 Hg BERYLLIUM 30 Hg 15 psi COPPER J 30 Hg 30 psi 30 Hg 60 psi AISI 403 30 Hg 100 psi ST STEEL 30 Hg 150 psi V 30 Hg 300 psi Inches Water STAND...

Страница 17: ... 25 0 16 0 1600 0 1 6 0 20 0 2000 0 2 0 25 0 2500 0 2 5 0 30 0 3000 0 3 0 40 0 4000 0 4 0 50 0 5000 0 5 0 60 0 6000 0 6 0 75 0 7500 0 7 5 0 100 0 10 000 0 10 0 125 0 12 5 0 160 0 16 0 200 0 20 0 250 0 25 0 400 0 40 0 500 0 50 0 600 0 60 0 750 0 75 0 1000 0 100 0 1250 0 125 0 1600 0 160 0 2500 0 250 0 4000 0 400 0 6000 0 600 0 7000 0 700 Vacuum BERYLLIUM COPPER J BERYLLIUM COPPER J BERYLLIUM COPPER...

Страница 18: ...5 3 137 3 82 3 34 9 27 98 4 15 9 62 7 in 1723 32 163 4 163 8 91 2 2 17 8 11 4 523 32 513 32 31 4 13 8 11 16 37 8 5 8 215 32 16 mm 450 1 425 5 415 9 241 3 50 8 47 6 31 8 145 3 137 3 82 3 34 9 27 98 4 15 9 62 7 Dim Units Inlet Pressure Connection P Dial Size 6 81 2 12 16 Weight Net Weight 43 4 lbs 61 2 lbs 91 4 lbs 121 4 lbs Shipping Weight 61 4 lbs 81 2 lbs 15 lbs 181 4 lbs Standard Inlet Fittings ...

Страница 19: ...19 ...

Страница 20: ...nc I M002 10126 8 05 Rev 02 14 Visit our web site www heise com 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 ...

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