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Chapter 1
General Information
Introduction
This manual contains operation and routine and preventive maintenance instructions for
the Model P3830, P3840, and P3860 High Pressure Hydraulic Deadweight Tester (DWT)
manufactured by Fluke. This section of the manual provides general information about
the DWT.
The P3800 Series of Deadweight Testers (DWT) provides a convenient means of testing
high pressure instruments for calibration accuracy.
The design incorporates the “Piston Gauge” principle, in which an applied pressure
within the system, balances a known mass applied to a piston of known effective area. i.e.
piston
of
area
Effective
piston
to
applied
mass
Total
PRESSURE
=
The unit comprises a base plate onto which is mounted a high pressure manifold, a
piston/cylinder unit (PCU), a test station (to mount the equipment under test), a fluid
reservoir, a ram screw pressure generating system, a pressure intensifier (which increases
the pressure generated by a factor of 7:1), and a safety relief valve (which protects both
the low and high pressure systems from accidental overpressure). The whole assembly is
contained within a strong GRP housing.
The unit is equipped with four adjustable feet to enable correct leveling. This ensures that
the PCU is in the vertical plane, which is essential for both accurate and reliable
performance.
The hydraulic fluid supplied with the unit has been specially formulated to remain fluid at
high pressures and to ensure no corrosion of internal parts. In addition the fluid will not
oxidize in contact with air or emulsify or mix with water.
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