Deadweight Tester

Type 1305D, Accuracy (0.1%)

Ashcroft^® Type 1305D deadweight testers provide an easy means of precisely generating

pressure to an accuracy of 0.1% of reading. Ashcroft 1305D units are available for operating

ranges up to 10,000 psi. They are ideal for use in calibrating, setting, testing and repairing

pressure measurement and control devices. Each 1305D unit is traceable to the National

Institute of Standards and Technology, assuring instrument accuracy.

These pressure systems are designed to be field portable. A single carrying case holds the

pressure generation pump as well as all the necessary tools and accessories. A second box

contains the weights used for pressure generation (10,000 psi units require two boxes of weights).

Ashcroft deadweight testers quality as primary standards for pressure calibration.

The pump is a two-stage hydraulic pressure generator. A built-in shuttle valve allows for rapid

pressure increase at low pressures. The rate of increase per pump cycle can be reduced at higher

pressures to minimize resistance. This is accomplished by simply repositioning the two-position shuttle

valve. With the shuttle valve in the high-pressure position, increasing pressure even when near the

10,000 psi upper limit can be accomplished quickly and easily. Final, precise adjustment is

accomplished through the use of an integral vernier-adjustment knob.

The 1305D is provided with two-piston cylinder assemblies. A low-pressure piston for pressure ranges

from 15 to 2000 psi and a high-pressure unit for pressures from 75 to 10,000 psi. The high-pressure

piston has an area of 1/80^th of a square inch while the low pressure piston has an area of 1/16^th of

a square inch. Weights are provided for pressure increments of 5, 10, 20, 25, 40, 50, 100, 200 and 500

psi (depending on piston in use). An optional 1 psi incremental weight is also available. Ashcroft 1305D

testers can be used anywhere within their operational range without any change in accuracy. The

same weights are used with both piston and cylinder assemblies.

Ashcroft 1305 units are available for psi, bar, kg/cm², and kPa ranges. Each unit comes complete

with a hand jack set (for removal of pointers on gauges being calibrated), spare O-rings and all

tools, accessories and fitting required for normal use.

1305D STANDARD PRESSURE RANGES

psi Type

Piston Assembly

Pressure Range

Piston Value

Number of Weights by Value

Net Weight

Low

High

Low

High

L-5

H-25

L-10

H-50

L-20

H-100

L-40

H-200

L-100

H-500

lb

kg

1305D-10

15/200

75/1000

5

25

1

3

2

3

-

60

27

1305D-20

15/400

75/2000

5

25

1

3

2

3

2

70

32

1305D-30

15/600

75/3000

5

25

1

3

2

3

4

85

39

1305D-50

15/1000

75/5000

5

25

1

3

2

3

8

105

48

1305D-100

15/2000

75/10,000

5

25

1

3

2

3

18

175

80