Item Brochure

2 Fluke Calibration P3000 Series Pneumatic Deadweight Testers Model P3000
Operating principle
Deadweight testers are the primary standard
for pressure measurements. Utilizing the well
proven piston-gauge system consisting of a
vertically mounted, precision lapped piston and
cylinder assembly, accurately calibrated masses
(Force) are loaded on the piston (Area), which
rises freely within its cylinder. These masses
balance the upward force created by the pres-
sure within the system.
Instrument base
There are four basic variations in the pneumatic
offering; single pressure, single vacuum, dual
vacuum and pressure, and oil-lubricated pneu-
matically driven high-pressure models. Pressure
or vacuum is generated by an external source or
an optional built-in hand pump (standard on the
lower pressure models). The hand pump option
is not available on instruments above 500 psi
(3.5 MPa).
Piston/cylinder assemblies
The piston/cylinder assembly is the heart of
each deadweight tester. They are manufactured
from materials that provide stability, durability,
and low thermal coefficients and distortion. Our
experience and knowledge of piston/cylinder
production and calibration ensure the precision
and performance required for today’s demand-
ing calibration requirements.
Masses
Standard masses are series 3 non-magnetic
austenitic stainless steel. Each mass is marked
with the serial number of the instrument and
the nominal pressure value relative to the high-
or low-pressure piston, when applicable. The
masses for the vacuum ranges and the optional
fine increment masses are stainless steel and/or
aluminum.
Gravity correction
Gravity varies significantly with geographical
location and this variation has a direct effect
on the force of the weights and the accuracy
of the deadweight tester. Each instrument can
be calibrated to local gravity at no extra cost. If
unspecified, instruments will be calibrated to
Standard Gravity at 980.665 cm/s
2
.
Gas supply
All instruments are fitted with a 1/4 inch NPT
female external supply port for connection to
the gas supply source. A compressed gas bottle
(nitrogen or dry air) fitted with a pressure regu-
lator is recommended. Ten percent above the
maximum pressure is required. A built-in hand
pump is available on some models to generate
pressures to 300 psi (2 MPa).
For vacuum requirements, an external
vacuum pump can be connected to the 1/4 inch
port. The built-in hand pump will also generate
up to 90 % vacuum.
PressCal Software
Windows-based software program that allows
users to easily apply all necessary corrections
to enhance the deadweight tester performance.
Calibration details are then stored and/or used
to automatically create a calibration certificate.
The use of PressCal allows for an improved
accuracy of 0.008 %.
Force
Force
Area
Area
Pressure
Pressure =