Dead-weight tester
High-pressure version
Model CPB3800HP
for further approvals
see page 5
Applications
■
Primary standard for calibrating the pressure scale in a
hydraulic range up to 2,600 bar (40,000 lb/in²)
■
Reference instrument for factory and calibration
laboratories for the testing, adjustment and calibration of
pressure measuring instruments
■
Complete, stand-alone system, also suitable for on-site
use
Calibration
WIKA data sheet CT 31.07
Special features
■
Total measurement uncertainty up to 0.01 % of reading
■
Dual-range piston-cylinder system 2,600 bar
(40,000 lb/in²) with fully automated changing between
ranges
■
Factory calibration includes traceability to national
standards, as standard, with UKAS calibration possible as
an option
■
Masses manufactured from stainless steel, can be
adjusted to local gravity
Description
Proven primary standard
Pressure balances (dead-weight testers) are the most
accurate instruments available on the market for the
calibration of electronic or mechanical pressure measuring
instruments. The direct measurement of the pressure
(p = F/A), as well as the use of high-quality materials enable
a very small measurement uncertainty, in conjunction with an
excellent long-term stability.
The pressure balance (dead-weight tester) has therefore
been used for years in factory and calibration laboratories in
industry, national institutes and research laboratories.
Stand-alone operation
Due to its integrated pressure generation and the purely
mechanical measuring principle, the model CPB3800HP is
ideal for on-site use for maintenance and service.
Dead-weight tester, high-pressure version, model
CPB3800HP
Basic principle
Pressure is dened as the quotient of force and area. The
core component of the CPB3800HP is therefore a very
precisely manufactured piston-cylinder system, onto which a
mass load is applied in order to generate the individual test
points.
The mass load is proportional to the target pressure and
this is achieved through optimally graduated masses. As
standard, these masses are manufactured to the standard
gravity (9.80665 m/s²), though they can be adjusted to a
specic location and also UKAS calibrated.
WIKA data sheet CT 31.07
Data sheets showing similar products and accessories:
Dead-weight tester in compact design; model CPB3800; see data sheet CT 31.06
Pneumatic dead-weight tester; model CPB3500; see data sheet CT 31.22
Hydraulic pressure balance; model CPB5800; see data sheet CT 31.11
Pressure balance in high-pressure version; model CPB5000HP; see data sheet CT 31.51
CalibratorUnit; model CPU6000; see data sheet CT 35.02
∙ 03/2018
Page 1 of 10
Easy operation
The integrated dual-area spindle pump enables rapid lling
of the test system and smooth pressure generation up to
2,600 bar (40.000 lb/in²). At the same time, the precisely
adjustable spindle pump also enables ne pressure
adjustment. A control schematic for pressure generation on
the instrument base facilitates quick and easy operation.
As soon as the measuring system reaches equilibrium, there
is a balance of forces between the pressure and the masses.
The excellent quality of the system ensures that this pressure
remains stable over several minutes, so that the pressure
value for comparative measurements can be read without
any problems, or also so that more complex adjustments can
be carried out on the test item.
Compact instrument design
The CPB3800HP is also particularly notable for its compact
dimensions, which are not altered during operation, since the
spindle runs within the pump body.
With its compact dimensions, the exceptionally robust ABS
plastic case and the low weight associated with these,
the CPB3800HP is also particularly suited for on-site
applications.
Control schematic on the CPB3800HP instrument base
Force F
The test item connection is equipped with a G ½ union nut
with metal cone. M16 x 1.5, M20 x 1.5 und 9/16-18 UNF
thread adapters with male threads are included in the scope
of delivery.
The piston-cylinder system
High accuracy over a wide measuring range
The dual-range piston-cylinder system oers two measuring
ranges in one case with automatic measuring range
switching from low-pressure to high-pressure pistons. This
provides the user with an extremely exible measuring
instrument that can cover a wide measuring range with high
accuracy, with only one piston-cylinder system and one
mass set. Additionally two test points can automatically be
achieved by loading the masses once.
Both the piston and cylinder are manufactured from
hardened steel or tungsten carbide, respectively. This
pairings of materials has very low pressure and temperature
coecients of expansion, which results in a very good
linearity for the eective area of the piston and a very high
accuracy.
Piston and cylinder are very well protected, against
contact, impacts or contamination from outside, in a solid
stainless-steel/hardened tool steel case. At the same time,
overpressure protection is integrated, which prevents the
piston from being forced out vertically and avoids damage to
the piston-cylinder system in the event of masses removal
under pressure.
1
2
Pressure p
Dual-range piston-cylinder system 2,600 bar
(40,000 lb/in²)
The masses are stacked directly onto the piston shaft. This
makes it easier to place the masses on and thus enables a
lower start value.
The overall design of the piston-cylinder system and the very
precise manufacturing of both the piston and the cylinder,
ensure exceptionally low friction force, which results in
excellent operating characteristics with long free-rotation time
and low sink rates. Thus a high long-term stability is ensured.
Therefore, the recommended recalibration interval is two to
ve years depending on the conditions of use.
1
High-pressure piston
2
Low-pressure piston = High-pressure cylinder
WIKA data sheet CT 31.07 ∙ 03/2018 Page 2 of 10
Tables of masses
The following tables show the number of masses within a
mass set with their nominal mass values and the resulting
For the measurement of the ambient conditions, the
CPU6000 CalibratorUnit can be used, see page 7.
nominal pressures for the respective measuring ranges.
The masses are manufactured, as standard, to the standard
Should the instrument not be operated under reference
conditions (ambient temperature 20 °C [68 °F], atmospheric
gravity (9.80665 m/s²) although they can be adjusted for any
local gravity.
pressure 1,013 mbar [14.69 psi], relative humidity 40 %), the
measured values must be corrected arithmetically.
Measuring range
[bar]
1 … 60 20 ... 2,600
1 … 2,600
Quantity Nominal pressure per piece Nominal pressure per piece
[bar] [bar]
Piston and make-up weight 1 1 20
Mass carrier 1 10 200
Masses (stackable on mass carrier) 7 10 200
Masses (stackable on piston shaft) 3 10 200
1 9 180
1 5 100
2 2 40
1 1 20
2 0.5 10
Set of ne increment masses
(optional)
2 0.2 4
1 0.1 2
1 0.05 1
2 0.02 0.4
1 0.01 0.2
Measuring range
[lb/in²]
10 … 800 200 ... 40,000
10 ... 40,000
Quantity Nominal pressure per piece Nominal pressure per piece
[lb/in²] [lb/in²]
Piston 1 10 200
Mass carrier 1 100 2.000
Masses (stackable on mass carrier) 14 100 2.000
Masses (stackable on piston shaft) 4 100 2.000
1 90 1.800
1 50 1.000
2 20 400
1 10 200
1 5 100
Set of ne increment masses
(optional)
WIKA data sheet CT 31.07 ∙ 03/2018 Page 3 of 10
2 2 40
1 1 20
1 0.5 10
2 0.2 4
1 0.1 2
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