deadweight tester (DWT) is a calibration standard which uses a piston cylinder
on which a load is placed to make an equilibrium with an applied
pressure underneath the piston. Deadweight testers are so called primarystandards which means that the pressure measured by a deadweight
tester is defined through other quantities; length, mass and time. Typically deadweight testers are used in calibration laboratories
to calibrate pressure transfer standards like electronic pressure
measuring devices.
Model | | Measuring Range | XY 0.6 | | 0.04-0.6Mpa | XY 6 | | 0.1-6Mpa | XY25 | | 0.5-25Mpa | XY 60 | | 1-60Mpa | XY 100 | | 1-100Mpa or 2-100Mpa |
Accuracy: 0.05% ; 0.02% ; 0.015% ;
0.01% Characteristic: ● Wide range. ● When the lower pressure is 1Mpa, the basic
errors of XY6,XY60,and XY100 type dead weight tester are
0.05%.Therefore a XY100 type dead weight tester can substitute for
three domestic dead weight tester with respective upper pressure
6Mpa, 60Mpa and 100Mpa. ● Piston and piston cylinder are made from
WC hard metal alloy with high strength, high hardness and low
linear expansion coefficient of temperature. Hence through
calculating, the distortion error of piston system under pressing
can be ignored. Even though the ambient temperature is widen to
20±5℃, the properties of piston gauge is still stabile. ● Because a precision furbishing process is
used for the working piston and piston cylinder, the cylindricity
and the gap between piston and piston cylinder are very small.
Therefore giving up using castor oil with viscosity 900-11—mm2/s as
pressure medium, instead using Di-(2-ethylhexyl)sebacate, which has
excessively low viscosity 20-25mm2/s and is appointed as the medium
in the international pressure comparison, ensure that piston gauge
have the most sensitivity. ● The working position of piston is
monitored by displacement sensor, which makes piston gauge more
sensitive and accurate. ● Low gravity center of loads , piston
rotating steadily and pressure fluctuating obscurely too much. ● Novel seal structure and excellent
properties. ● Pump, pressure regulator , valve and pipe
can be used conveniently because of reliability, portability and
perfection. XIYI Group Co., Ltd ( Xi'an Instrument Factory) Precision pressure gauge, stainless steel pressure gauge, pressure
pump, seismic pressure gauge, piston manometer, floating ball type
pressure gauge, hand pressure pump, Electric contact pressure gauges, diaphragm pressure gauges,
digital pressure gauge, vacuum gauge, vacuum pressure pump, |