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Deadweight Tester
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Type 1305D, Accuracy (0.1%)
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Ashcroft®
Type 1305D deadweight testers provide an easy means of precisely
generating
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pressure to an accuracy of 0.1% of reading.
Ashcroft 1305D units are available for operating
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ranges up to 10,000 psi.
They are ideal for use in calibrating, setting, testing and repairing
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pressure measurement and control devices. Each
1305D unit is traceable to the National
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Institute of Standards and Technology,
assuring instrument accuracy.
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These pressure systems are designed to be field portable. A
single carrying case holds the
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pressure
generation pump as well as all the necessary tools and accessories. A second
box
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contains the weights
used for pressure generation (10,000 psi units
require two boxes of weights).
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Ashcroft deadweight testers quality
as primary standards for pressure calibration.
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The
pump is a two-stage hydraulic pressure generator. A built-in shuttle valve
allows for rapid
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pressure increase at low pressures. The rate of
increase per pump cycle can be reduced at higher
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pressures to minimize resistance. This is
accomplished by simply repositioning the two-position shuttle
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valve. With the shuttle valve in the high-pressure
position, increasing pressure even when near the
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10,000
psi upper limit can be accomplished quickly and
easily. Final, precise adjustment is
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accomplished through the use of an
integral vernier-adjustment knob.
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The 1305D is provided with two-piston cylinder assemblies. A
low-pressure piston for pressure ranges
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from 15 to
2000 psi and a high-pressure unit for pressures
from 75 to 10,000 psi. The high-pressure
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piston has an area of 1/80th of a square inch while
the low pressure piston has an area of 1/16th of
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a square
inch. Weights are provided for pressure increments of 5, 10, 20, 25, 40, 50,
100, 200 and 500
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psi
(depending on piston in use). An optional 1 psi
incremental weight is also available. Ashcroft 1305D
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testers can be
used anywhere within their operational range without any change in accuracy.
The
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same weights are
used with both piston and cylinder assemblies.
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Ashcroft
1305 units are available for psi, bar, kg/cm2,
and kPa ranges. Each unit comes complete
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with
a hand jack set (for removal of pointers on gauges being calibrated), spare
O-rings and all
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tools, accessories and fitting required for normal
use.
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1305D STANDARD PRESSURE
RANGES
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psi Type
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Piston Assembly
Pressure Range
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Piston Value
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Number of Weights by
Value
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Net Weight
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Low
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High
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Low
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High
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L-5
H-25
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L-10
H-50
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L-20
H-100
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L-40
H-200
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L-100
H-500
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lb
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kg
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1305D-10
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15/200
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75/1000
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5
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25
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1
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3
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2
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3
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-
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60
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27
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1305D-20
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15/400
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75/2000
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5
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25
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1
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3
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2
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3
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2
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70
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32
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1305D-30
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15/600
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75/3000
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5
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25
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1
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3
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2
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3
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4
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85
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39
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1305D-50
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15/1000
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75/5000
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5
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25
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1
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3
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2
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3
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8
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105
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48
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1305D-100
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15/2000
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75/10,000
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5
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25
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1
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3
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2
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3
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18
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175
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80
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