background image

of 20

8

One Weight Box: 

10 inch (25 cm) width; 10 inch (25 cm); 10 inch (25 cm) 

height
Storage space dimensions are larger than actual size of 

tester carrying case and deadweight carrying case by 

approximately _ inch, (1.3 cm), in order to facilitate ease of 

handling in storage.
Note:  For catalog numbers 1305D, DH-100, 1305DM, 

DMH-150, 1305DB, DBH-700 and 1305DA, DAH-

700 allow storage space for two weight boxes.

3.3 Operation 1305D
3.3.1 Piston and Cylinder Selection
 

The 1305D Tester is a dual range device in that most 

-models utilize two interchangeable piston and cylinder 

assemblies for measurement of pressure throughout the 

entire range. Each piston and cylinder assembly has a 

minimum and maximum operating range. First, determine 

what pressure points need to be measured and select the 

appropriate assembly. The pressure range of the assem-

blies is shown in Table 2-1. When priming the pump the 

high pressure piston and cylinder assembly should be used.
3.3.2 Priming the Pump 

The offset pipe (64 or 66 Figure 2-1) should already be 

secured in place and the reservoir should contain the op-

erating fluid (refer to Installation Section 3.2).
Close the release valve (37) by turning it clockwise and 

open the air vent by loosening the filler plug (35) a few 

turns. The shuttle valve (51) should be pulled outward 

from the pump body, the end of the knob approximately 

even with the edge of drip pan. In this position the high 

 volume displacement mode is selected and the pump is 

self-priming. Operate the pump handle several times using 

full strokes, until you see fluid appear in the outer pump 

body outlet.
The cone seat (82) is located in the base of the out-

er-pump body outlet and serves as the sealing surface 

between the bottom of the piston and cylinder assembly 

and the pump body. Confirm the coned end of the seat 

is facing up and the cylindrical end of it is facing down. 

Thread the high pressure piston and cylinder assembly 

(79) or (67) into the outer body outlet as shown, using the 

wrenches provided.
Operate the pump handle a few more times until fluid 

is observed at the end of the offset pipe. Connect the 

gauge or other device to be tested to the offset pipe. 

For purposes of priming, the device must be designed 

to withstand the full operating pressure of 10,000 psi 

(70,000kPa). If a lower range device must be used, ex-

treme care must be exercised to avoid overpressuring 

its pressure element. Seal the connection to the device 

by tightening nut adapter (62) and adapter (60) until the 

coned end of the pipe is forced into its inlet. If necessary, 

rotate the device for viewing by loosening nut adapter (62), 

set it to the proper position and retighten nut adapter.
Again, operate the pump handle a few more times. After 

a few strokes positive pressure will develop and the pump 

handle will begin to resist pumping action. Raise the pump 

handle to its uppermost travel position. Loosen the bleed 

screw (30) a half turn counter clockwise and slowly op-

erate the pump handle through a downward stroke until 

fluid flows steadily from the bleed vent. Close the bleed 

screw just prior to completing the downward handle mo-

tion. Repeat this action until no air bubbles are observed 

in the fluid flow. (Note – the bleed screw must be closed 

when the handle is being raised). Push the shuttle valve 

in towards the pump body and continue pumping to the 

desired test pressure. Open the release valve (37) to vent 

the pressure. To check operation pull the shuttle valve 

outward, close the release valve and operate the pump 

handle several times. When handle resistance is felt, push 

the shuttle valve inward and continue pumping within the 

range of the test device.
Entrapped air will prevent the pump from operating in the 

high pressure valve position or cause it to achieve only 

partial pressure. Repeat the above bleed procedure as 

necessary to assure all air is removed. Once air is re-

moved the pump will continue to operate without further 

attention providing the reservoir level is maintained.
3.3.3 Weights 

The weight set consists of a selection of various masses 

that will produce desired pressure increments when op-

erated with the appropriate piston and cylinder assembly. 

Each weight is stamped with two pressure values. When 

applied to the high pressure piston and cylinder assembly 

the equivalent pressure value is indicated next to the letter 

“H”. Conversely, when applied to the low pressure piston 

and cylinder assembly the equivalent pressure value is in-

dicated next to the letter “L”. The piston and piston platform 

also contribute to the total mass. Their equivalent pressure 

value is stamped on the top of the platform.
During normal operation, selected weights are added to 

the plate and piston assembly to equal the desired pres-

sure value.
3.3.4 Levelness 

The deadweight tester must be level to function properly. 

The unit may be leveled by placing a bubble type level on 

top of the piston plate and revolving it slowly. Shims may 

be used between drip pan and bench to level the piston 

plate. The unit is level when the position of the bubble 

does not change within the glass as it is rotated on top of 

the piston assembly.
3.3.5 Making the Test 

Add weight to the piston plate to give desired calibrating 

pressure.
Pull the shuttle valve (51) outward from the body and 

close the pressure release valve (37). Operate the pump 

handle until the fluid pressure forces the piston to raise the 

weights. When pumping, the weights should be rotated 

slowly to decrease cylinder wall friction. If pump handle 

resistance is difficult and the weights have not risen, push 

the shuttle valve inward and continue pumping. With the 

shuttle valve pushed in, the fluid displacement of each 

stroke is reduced, thereby requiring less effort to continue 

pumping.
The piston assembly has a maximum lift of 

3

4

 inch (1.9 

cm). It is recommended that readings be taken at mid-

point, or 

3

8

 inch (1 cm) lift. Small adjustments to the piston 

lift can be made with the pump handle or the displacement 

valve (41).
Improper readings will result if the piston plate is so low 

that it rests on the bushing, or so high that the internal  

stop on the piston assembly is touching the underside of 

the bushing.
Spin the weights by hand and take readings only when 

the weights are spinning. Speed of rotation is unim-

portant, although a slow speed is more convenient and 

 recommended.
To release pressure, turn valve (37) counterclockwise slowly.
3.3.6 To Dismantle  

Содержание 1305D

Страница 1: ... Manual for the ASHCROFT Type 1305D Deadweight Tester andType 1327D Portable Pump Installation and Maintenance Manual for the ASHCROFT Type 1305D Deadweight Tester andType 1327D Portable Pump I M002 10095_RevF_ 250 1526 _09 20 22 ...

Страница 2: ...of 20 2 ...

Страница 3: ...0018 New York NY 10017 1 Pressure Select a range so that the maximum ap plied pressure will never exceed the upper range limit 2 Vibration Excessive vibration could cause a loosen ing of components and abnormal wear resulting in loss of instrument accuracy or failure to provide valid data 3 Temperature Operation of the instrument in an en vironment where temperatures are in excess of design rating...

Страница 4: ...nt mass being acted upon by gravity For this rea son the masses supplied with the tester are stamped with two pressure values the value being contingent on the effective area of the piston and cylinder assembly selected 2 1 3 Specifications 1305D Accuracy Combined tolerance of weights and piston and cylinder assemblies within 0 1 of reading Weight toler ance within 0 05 of mass Piston and cylinder...

Страница 5: ...1 2 1 26 175 80 Model Piston Assembly Piston Net Number Pressure Range Piston Area Value Number of Weights by Value Weight L 5 L 1 L 2 L 4 L 5 bar Type Low High Low High Low High H 2 5 H 5 H 10 H 20 H 25 lbs kg 1305DB 20 1305DBH 20 1 20 5 2 5 1 1 2 1 2 63 29 1305DB 100 1305DBH 100 1 20 5 100 5 2 5 1 1 2 1 2 65 30 1305DB 150 0613 in 2 0123 in 2 1305DBH 150 1 30 5 150 3954 0791 5 2 5 1 1 2 1 4 75 34...

Страница 6: ...andard 1 4 inch internal NPT and 1 2 inch internal NPT fitting adapters are supplied Operating Fluid 1327D Light grade machine oils au tomotive petroleum base SAE 20 oils or other equivalent fluids suitable for use with Buna N O ring materials 1 5 pints required 7 liters 1327DH Most hydraulic oils of phosphate ester base brake fluids skydrol pydraul etc suitable for use with Butyl or Ethylene Prop...

Страница 7: ...DMG 250 1327DMGH 250 X X 0 10 0 40 0 250 40 18 1327DMGO 250 1327DMG 600 1327DMGH 600 X X 0 10 0 40 0 250 0 600 42 19 1327DMGO 600 1327DBG 10 1327DBGH 10 X X 0 10 36 16 1327DBGO 10 1327DBG 40 1327DBGH 40 X X 0 10 0 40 38 17 1327DBGO 40 bar 1327DBG 250 1327DBGH 250 X X 0 10 0 40 0 250 40 18 1327DBGO 250 1327DBG 600 1327DBGH 600 X X 0 10 0 40 0 250 0 600 42 19 1327DBGO 600 1327DAG 1000 1327DAGH 1000 ...

Страница 8: ...ndle mo tion Repeat this action until no air bubbles are observed in the fluid flow Note the bleed screw must be closed when the handle is being raised Push the shuttle valve in towards the pump body and continue pumping to the desired test pressure Open the release valve 37 to vent the pressure To check operation pull the shuttle valve outward close the release valve and operate the pump handle s...

Страница 9: ...of 20 9 Figure 2 1 Ashcroft Portable Deadweight Tester 1305D ...

Страница 10: ...he gauge to the desired position and re tightening nut adapter Repeat the above procedure to connect the gauge being tested to the offset pipe assembly 64 or 66 3 4 3 Bench Space Required Allow a space 10 inch 2 5 cm width 23 inch 5 8 cm depth 22 inch 5 6 cm height allows for testing gauges up to 8 5 inch 250 mm size 3 4 4 Storage Space Required 101 2 inch 27 cm width 221 2 in 57 cm depth 10 inch ...

Страница 11: ...ght of oil for various pressures A lighter oil may be used where low pressures are being checked a heavier oil where higher pressures are being tested The reservoir can be refilled while the test pump is operat ing under pressure 3 5 7 Caution Standard testers designed for oil service may not be used with water for oxygen service 3 5 8 Hydraulic service testers should not be filled with water or a...

Страница 12: ...uracy of the finished weights better than 1 20th of 1 To maintain deadweight tester accuracy handle the weights with care and keep the piston and cyl inder in clean condition The tester should be flushed with a solvent occasionally preferably every six months so that operating fluid is al ways clean This will prolong component life and provide protection against possible sticky action between the ...

Страница 13: ...f the tester body assembly casting When replacing O ring packings coat them with suitable lubricant to pre vent sticking and tearing during assembly and tightening of connection 5 14To Reassemble Body assembly on drip pans Replace body assembly 2 on drip pan 3 using bolts 25 5 15 Replacing Displacement Valve a Place O ring packing between back up washers b Attach back up washers and O ring packing...

Страница 14: ...of 20 14 Figure 2 2 Ashcroft Portable Test Pump Type 1327D ...

Страница 15: ...ylinder 3 Damaged piston plate damaged cylinder threads or damage to any component part that results in inferior performance or malfunctioning of the unit The piston cylinder assembly is available as a unit only This assures the user of maximum accuracy in his Ashcroft Deadweight Tester and maintains certified trace ability to the N I S T 6 0 WARRANTY SHIPPING INSTRUCTIONS HOWTO ORDER 6 1 Warranty...

Страница 16: ...ate with deadweights drops rapidly Unable to hold constant pressure Worn piston and cylinder assembly Use a heavy oil temporarily Replace piston cylinder Stacked dead weights wobble when spinning piston plate Damaged dead weights Check dead weights for visible damage bends dents nicks etc and alignment Piston plate as sembly will not spin Too heavy an oil grade being used Flush fill unit with prop...

Страница 17: ...of 20 17 4A ...

Страница 18: ...d Valve 27 70 52 1 LEE236 Nameplate 4 70 58 1 LK227 Pipe Extension Assembly 180 00 Qty Unit Item Per List No Asmy Part No DescriptionPrice 59 2 LD227A Bushing2 9 50 60 2 LN141 Adapter 25 40 61 4 LD186 Collar 9 50 62 4 LD117 Nut Adapter 25 20 63 1 LH227A Extension Pipe 67 00 64 1 LJ227 Lower Connection Pipe Assembly 65 1 LF227A Lower Connection Pipe 104 00 66 1 LG227A Back Connection Pipe 104 00 67...

Страница 19: ... psig 100 500 PSI WEIGHT SETS Weight Set Number of Weights with by High Pressure Value Part Carrying 25 50 100 200 500 Number Case psi psi psi psi psi LBH199C 1000 psi 1 3 2 3 LBH199B 2000 psi 1 3 2 3 2 LBH199A 3000 psi 1 3 2 3 4 LBH199 5000 psi 1 3 2 3 8 LBH199D 5000 to 10 10000 psi For complete 10 000 psi weight set order both part no LBH199 and LBH199D AVAILABLE WEIGHTS WEIGHT SETS ...

Страница 20: ...change without notice All sales subject to standard terms and conditions Ashcroft Inc I M002 10095_RevF_ 250 1526 _09 20 22 Ashcroft Inc 250 East Main Street Stratford CT 06614 5145 U S A Tel 203 378 8281 email info ashcroft com www ashcroft com ...

Отзывы: