Hydraulic pressure balance
Model CPB5800
for further approvals
see page 8
Applications
■
Primary standard for calibrating the pressure scale in a
hydraulic range up to 1,400 bar (20,000 psi)
■
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 technology
WIKA data sheet CT 31.11
Special features
■
Total measurement uncertainty to 0.006 % of reading
■
Extremely exible instrument with a wide range of single
and dual-range piston-cylinder systems
■
Dual-range piston-cylinder systems with fully automated
changing between ranges
■
Factory calibration included as standard, traceable to
national standards, with UKAS calibration possible as an
option
■
Fast and safe replacement of the piston-cylinder system
via patented ConTect quick-release system as an option
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.
Hydraulic pressure balance model CPB5800
Basic principle
Pressure is dened as the quotient of force and area. The
core component of the CPB5800 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.
Stand-alone operation
Due to its integrated pressure generation and the purely
mechanical measuring principle, the model CPB5800 is ideal
for on-site use for maintenance and service.
∙ 04/2016
Data sheets showing similar products and accessories:
Dead-weight tester in compact design; model CPB3800; see data sheet CT 31.06
Pneumatic pressure balance; model CPB5000; see data sheet CT 31.01
Pressure balance for high pressure; model CPB5000HP; see data sheet CT 31.51
Pressure balance dierential pressure version; model CPB5600DP; see data sheet CT 31.56
CalibratorUnit; model CPU6000; see data sheet CT 35.02
Page 1 of 13WIKA data sheet CT 31.11
The instrument base model CPB5800
Easy operation
In the stable instrument base, the integrated priming pump
and the 250 ml tank enable large test volumes to be easily
lled and pressurised. For further pressure increases and
ne adjustment, a very precisely controllable spindle pump is
tted, which only runs within the pump body.
As soon as the measuring system reaches equilibrium, there
is a balance of forces between the pressure and the masses
applied. 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.
High-performance instrument range
The CPB5800 instrument bases are available in 2 variants:
■
Standard hydraulic base
- up to max. 1,200 bar (16,000 psi)
- with integrated pressure generation through priming
pump and spindle pump
- Pressure transmission medium
Standard: Mineral oil
Optional: Sebacate oil, brake uid, Skydrol or Fomblin oil
Standard connection piston-cylinder system
1
2
Test item connection
140354112152625
■
Hydraulic high-pressure base
- up to max. 1,400 bar (20,000 psi)
- with integrated pressure generation through priming
pump and spindle pump
- Pressure transmission medium mineral oil or Sebacate
oil
As standard, both instrument bases are tted with a
connection for the model CPS5800 piston-cylinder system
with G ¾ male thread.
As an option a M30 x 2 female thread for optional CPS5000
piston-cylinder systems is available.
With the 1,200 bar instrument base (16,000 psi instrument
base), the patented ConTect quick-release mechanism
is available as an option. This enables the piston-cylinder
system to be changed quickly and safely without any tools.
The connection of the test item is made without tools using
a quick connector. Via the freely rotating knurled nut, the test
item can be oriented as required. As standard, a threaded
insert with a G ½ female thread is provided. Other threaded
inserts are available to connect the most common pressure
measuring instruments.
5
1
Oil collecting tray
2
Temperature sensor, optional
3
Threaded insert, changeable
4
O-ring 8 x 2
5
Quick connector with knurled nut
3
4
Page 2 of 13 WIKA data sheet CT 31.11 ∙ 04/2016
The piston-cylinder system model CPS5800
The CPS5800 piston-cylinder systems are available in two
fundamentally dierent designs, depending on the measuring
range:
■
Single-range piston-cylinder system (for measuring
ranges 120 bar and 300 bar) (1,600 and 4,000 psi)
■
Dual-range piston-cylinder system (for measuring ranges
700 bar, 1,200 bar and 1,400 bar) (10,000, 16,000 and
20,000 psi)
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 piston. 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. Furthermore, two test points can automatically be
achieved by loading just the one mass.
Both the piston and cylinder are manufactured from
hardened steel or tungsten carbide, respectively. These
pairings of materials have 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.
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 dependent on the conditions of use.
Force F Force F
6
Pressure p
Pressure p
Dual-range piston-cylinder system model CPS5800Single-range piston-cylinder system model CPS5800
7
8
6
Eective area A
7
High-pressure piston
8
Low-pressure piston = High-pressure cylinder
WIKA data sheet CT 31.11 ∙ 04/2016 Page 3 of 13
As an option the model CPS5000 hydraulic piston-cylinder
systems are available.
For detailed specications see data sheet CT 31.01.
The mass set, model CPM5800
The mass set is supplied in a wooden case with a foam
insert. This includes the masses listed in the tables of
masses below, made from non-magnetic stainless steel, and
optimised for everyday use.
For ner increments and for a higher resolution, as an option,
the standard mass sets can be extended by a set of ne
increment masses.
If even smaller intermediate values need to be generated,
using one of the class M1 or F1 set of ne increment masses
from the accessories is recommended.
As an option for the CPS5000 piston-cylinder systems
CPM5000 mass sets are available. For detailed
specications see data sheet CT 31.01.
Tables of masses
Mass set model CPM5800
The following tables show the number of masses within a
mass set with their nominal mass values and the resulting
nominal pressures for the respective measuring ranges.
The masses are manufactured, as standard, to the standard
gravity (9.80665 m/s²) although they can be adjusted for any
local gravity.
Should the instrument not be operated under reference
conditions (ambient temperature 20 °C (68 °F), atmospheric
pressure 1,013 mbar (14.69 psi), relative humidity 40 %),
the measured values must be corrected arithmetically. For
The mass sets can be manufactured for the following
dierent pressure units, bar, kg/cm², kPa, MPa or psi and can
be used with the same piston-cylinder system.
the measurement of the ambient conditions, the CPU6000
CalibratorUnit can be used, see page 11.
Measuring range
[bar] or [kg/cm²]
Piston and make-up
weight
Standard mass set 4 20 4 50 5 10 100 4 10 200 5 10 200
Set of ne increment
masses
(optional)
Single-piston measuring
Dual-piston measuring ranges
ranges
1 … 120 2 … 300 1 … 700 1 … 1,200 1 … 1,400
1 … 60 10 … 700 1 … 60 20 ... 1,200 1 … 60 20 … 1,400
Quantity
Nominal
pressure per
piece
Quantity
Nominal
pressure per
piece
Quantity
Nominal
pressure per
piece
Nominal
pressure per
piece
Quantity
Nominal
pressure per
piece
Nominal
pressure per
piece
Quantity
Nominal
pressure per
piece
[bar]
[kg/cm²]
1 1 1 2 1 1 10 1 1 20 1 1 20
1 18 1 45 1 9 90 1 9 180 1 9 180
1 10 1 25 1 5 50 1 5 100 1 5 100
2 4 2 10 2 2 20 2 2 40 2 2 40
1 2 1 5 1 1 10 1 1 20 1 1 20
2 1 1 3 1 0.5 5 1 0.5 10 1 0.5 10
1 0.5 1 2.5 -- -- -- -- -- -- -- -- --
1 0.4 2 1 2 0.2 2 2 0.2 4 2 0.2 4
1 0.2 1 0.5 1 0.1 1 1 0.1 2 1 0.1 2
1 0.1 1 0.25 1 0.05 0.5 1 0.05 1 1 0.05 1
2 0.04 2 0.1 2 0.02 0.2 2 0.02 0.4 2 0.02 0.4
1 0.02 1 0.05 1 0.01 0.1 1 0.01 0.2 1 0.01 0.2
[bar]
[kg/cm²]
[bar]
[kg/cm²]
[bar]
[kg/cm²]
[bar]
[kg/cm²]
[bar]
[kg/cm²]
[bar]
[kg/cm²]
[kg/cm²]
Nominal
pressure per
piece
[bar]
Page 4 of 13 WIKA data sheet CT 31.11 ∙ 04/2016
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