Calibration Technology
Deadweight Tester
Model CPB5000
Mensor Data Sheet CPB5000B
Applications
 Primary standard for ranges up to 1500 psi (100 bar)
(pneumatic) or 15,000 psi (1,000 bar) (hydraulic)
 Reference instrument for testing, adjusting and calibrating
pressure measuring instruments in factories and calibration
laboratories
 Self-contained, complete system suitable for on-site
measurements/calibrations
Special Features
 Total uncertainty of measurement down to 0.008 % of
reading
 Factory calibration certificate is standard, traceable to NIST
 High long-term stability with a recommended recalibration
cycle of 5 years
 Masses manufactured from stainless steel and aluminium,
local gravity adjustment possible at no additional charge
 The patented ConTect quick-change system enables fast
and secure exchange of the piston cylinder system in order
to change the measuring range.
Deadweight Tester Model CPB5000
Description
Proven primary standard
Deadweight Testers are the most accurate instruments for the
calibration of electronic or mechanical pressure measuring
instruments.
The direct measurement of pressure, (P = F/A) and the use of
high-quality materials, result in small measurement uncertainties and an excellent long-term stability of five years.
For these reasons deadweight testers have been used in the
calibration laboratories of industry, national institutes and
research laboratories for many years.
Basic principle
Pressure is defined as the quotient of force and area. Correspondingly, the core of the CPB5000 is a very preciselymanufactured piston cylinder system, which is loaded with
masses in order to generate the individual test points.
The weight applied is proportional to the desired pressure
and accomplished by using optimal graduated weights.
These weights are manufactured to standard gravity
(9.80665 m/s²) although, for fixed location usage, they can
be adjusted to a customer-specified local gravity.
Self-contained operation
Due to the integrated pressure generation and the purely
mechanical measuring principle, the CPB5000 is ideally
suited to on-site use as well as service and maintenance
purposes.
Mensor Data Sheet CPB5000B ∙ 09/2008
Page of 8
Operation
Depending on the instrument version the pressure is set via an
integrated pump or via an external pressure supply by the use
of control valves. For fine adjustment a precisely adjustable
spindle pump is mounted within the pump body.
Piston Cylinder System
Both the piston and cylinder are manufactured from Tungsten
Carbide. Compared to other materials, Tungsten Carbide has
very small pressure and thermal expansion coefficients, which
results in very good linearity of the effective cross-sectional area
of the piston and high measurement accuracy.
As soon as the measuring system reaches equilibrium, there is
a balance of forces between pressure and mass applied.
The system ensures that this pressure remains stable over
several minutes, so that the device under test can be calibrated
or time-consuming adjustments can be carried out.
The standard connection for the piston cylinder system is an
M30 x 2 male thread.
The patented ConTect quick-connect system, for easy measuring range changes without tools, is available as an option.
Piston and cylinder are protected in a solid stainless steel
housing, against contact, impacts or contamination from
outside. In addition, over pressure protection is integrated, which
prevents the piston from being forced out vertically and avoids
damage to the piston cylinder system in the event of weight
removal under pressure.
Force F
The weight discs are stacked on a bell which is fitted to the piston
skirt. Due to the construction of the bell, the center of gravity
for the stacked weights is very low, which minimizes both the
side thrust on the piston cylinder system and the friction. For
relatively low starting pressures, a lighter aluminium plate can
be used instead of the bell.
The overall design of the piston cylinder unit and the very precise
manufacturing of both the piston and the cylinder ensure excellent operating characteristics with a long free rotation time, low
sink rates and a very high long-term stability. Therefore the
recommended recalibration interval is 5 years.
High-performance instrument range
The CPB5000 instrument bases are available in the following
3 designs:
 Low-pressure pneumatic base
- up to a max. 10 bar / 150 psi
- with integrated pressure generation through inlet pressure
pump and spindle pump
 High-pressure/Vacuum pneumatic base
- up to a max. 100 bar / 1,500 psi
- Connection for an external pressure supply or vacuum
Cross-sectional
area A
Pressure P
Piston Cylinder System
As a standard all instrument bases are equipped with a
connection for the piston cylinder system with M30 x 2 female
threads.
Optionally, the integrable patented ConTect quick-change
adapter enables fast and secure changing of the measuring
range, without the need for tools. In this way you can build a
price-optimised complete system from one universal base and
up to 3 ConTect piston cylinder systems for different measuring ranges, which can be operated with only one mass set.
 Hydraulic base
- up to a max. 1,000 bar / 15,000 psi
- with integrated pressure generation through inlet pressure
pump and spindle pump
Page of 8
Mensor Data Sheet CPB5000B ∙ 09/2008
Tables of masses
must be considered, if necessary.
These weights are manufactured to standard gravity (9.80665
m/s²) although, for fixed location usage, they can be adjusted
to a customer-specified local gravity.
The following tables show the number of weights per measuring range, within a weight set, with their nominal mass values
and the resulting nominal pressures. Should you not operate
the device under reference conditions (ambient temperature 20
°C, air pressure 1013 mbar, relative humidity 40 %), corrections
bar
bar
bar
bar
bar
bar
bar
bar
Nominal pressure per piece
2 … 1,000
Pieces
Pieces
Nominal pressure per piece
2 … 600
Nominal pressure per piece
1 ... 400
Pieces
Pieces
Pieces
bar
1 ... 250
Nominal pressure per piece
0.2 ... 100
Nominal pressure per piece
Pieces
0.2 ... 60
Nominal pressure per piece
Pieces
0.4 ... 100
Nominal pressure per piece
Pieces
Pieces
Nominal pressure per piece
0.4 ... 50
bar
bar
1
0.03
1
0.03
1
0.2
1
0.4
1
0.4
1
0.2
1
0.2
1
1
1
1
1
2
1
2
Bell jar
-
-
1
0.16
1
0.8
1
4
1
4
1
1.6
1
1.6
1
8
1
8
1
16
1
16
Aluminium plate
1
0.07
1
0.01
1
0.05
1
0.25
1
0.25
1
0.1
1
0.1
1
0.5
1
0.5
1
1
1
1
Masses 4 kg
-
-
-
-
-
-
-
-
-
-
6
8
11
8
5
40
11
40
6
80
11
80
Masses 2 kg
-
-
-
-
-
-
-
-
5
10
2
4
2
4
2
20
2
20
2
40
2
40
Masses 1 kg
-
-
9
0.2
9
1
9
5
9
5
1
2
1
2
1
10
1
10
1
20
1
20
Masses 0.5 kg
8
0.1
1
0.1
1
0.5
1
2.5
1
2.5
1
1
1
1
1
5
1
5
1
10
1
10
Masses 0.25 kg
1
0.05
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Masses 0.2 kg
-
-
1
0.04
1
0.2
1
1
1
1
1
0.4
1
0.4
1
2
1
2
1
4
1
4
Masses 0.12 kg
-
-
1
0.024
1
0.12
1
0.6
1
0.6
-
-
-
-
-
-
-
-
-
-
-
-
Masses 0.1 kg
2
0.02
1
0.02
1
0.1
1
0.5
1
0.5
1
0.2
1
0.2
1
1
1
1
1
2
1
2
Masses 0.07 kg
-
-
1
0.014
1
0.07
1
0.35
1
0.35
-
-
-
-
-
-
-
-
-
-
-
-
Masses 0.05 kg
1
0.01
1
0.01
1
0.05
1
0.25
1
0.25
1
0.1
1
0.1
1
0.5
1
0.5
1
1
1
1
psi
Piston
Hydraulic Models
psi
psi
psi
psi
psi
psi
psi
psi
Nominal pressure per piece
Pieces
29 ... 10,000 29 ... 15,000
Nominal pressure per piece
Nominal pressure per piece
Pieces
Nominal pressure per piece
Nominal pressure per piece
Pieces
Nominal pressure per piece
5.8 ... 1,000 5.8 ... 1,500 2.9 ... 1,000 14.5 ... 5,000
Pieces
Nominal pressure per piece
5.8 ... 500
Pieces
Nominal pressure per piece
Pieces
2.9 ... 150
Nominal pressure per piece
Pieces
Nominal pressure per piece
Pieces
-0.435... -14 0.435... 30
Pieces
Pneumatic Models
Measuring
range
[psi]
Pieces
Piston
0.2 ... 10
Nominal pressure per piece
0.03 ... 2
Pieces
Nominal pressure per piece
-0.03 ... -1
Pieces
Measuring
range
[bar]
Hydraulic Models
Nominal pressure per piece
Pneumatic Models
psi
1
0.435
1
0.435
1
2.9
1
5.8
1
5.8
1
5.8
1
2.9
1
14.5
1
29
1
29
Bell jar
-
-
1
2.22
1
11.1
1
55.5
1
55.5
1
55.5
1
23.1
1
115.5
1
231
1
231
Aluminium plate
1
0.565
1
0.22
1
1.1
1
5,5
1
5.5
1
5.5
1
1.1
1
5.5
1
11
1
11
Masses 3.5 kg
-
-
-
-
-
-
-
-
-
-
-
-
9
100
9
500
9
1000
14
1000
Masses 1.4 kg
-
-
5
4
5
20
-
-
5
100
8
100
1
40
1
200
1
400
1
400
Masses 1 kg
-
-
2
3
2
15
2
75
2
75
2
75
1
30
1
150
1
300
1
300
Masses 0.7 kg
4
2
4
2
4
10
4
50
4
50
9
50
2
20
2
100
2
200
2
200
Masses 0.35 kg
4
1
3
1
3
5
3
25
3
25
3
25
1
10
1
50
1
100
1
100
Masses 0.19 kg
-
-
1
0.548
1
2.74
1
13.7
1
13.7
1
13.7
-
-
-
-
-
-
-
-
Masses 0.175 kg
1
0.5
-
-
-
-
-
-
-
-
-
-
1
5
1
25
1
50
1
50
Masses 0.14 kg
-
-
1
0.4
1
2
1
10
1
10
1
10
1
4
1
20
1
40
1
40
1
0.345
1
1.725
1
8.625
1
8.625
1
8.625
-
-
-
-
-
-
-
-
Masses 0.12 kg
Masses 0.07 kg
2
0.2
1
0.2
1
1
1
5
1
5
1
5
1
2
1
10
1
20
1
20
Masses 0.035 kg
1
0.1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Mensor Data Sheet CPB5000B ∙ 09/2008
Page of 8
Specifications
Model CPB5000
Version
pneumatic
1)
Measuring range
bar
-0.03 … -1
0.03 … 2
0.2 … 10
0.4 … 50
0.4 … 100
Required weights
kg
5
10
10
10
20
Smallest step
bar 2)
0.01
0.01
0.05
0.25
0.25
Nominal cross-sectional area of the piston
cm²
5
5
1
0.2
0.2
Version
pneumatic
Measuring range
psi 1)
-0.435 … -14 0.435 … 30
2.9 … 150
5.8 … 500
5.8 … 1,000 5.8 … 1,500
Required weights
kg
5
10
10
7
13
20
Smallest step
psi 2)
0.1
0.2
1
5
5
5
Nominal cross-sectional area of the piston
cm²
5
5
1
0.2
0.2
0.2
Version
hydraulic
Measuring range
bar 1)
0.2 … 60
0.2 … 100
1 … 250
1 … 400
2 … 600
2 … 1,000
Required weights
kg
30
50
25
40
30
50
Smallest step
bar 2)
0.1
0.1
0.5
0.5
1
1
Nominal cross-sectional area of the piston
cm²
0.5
0.5
0.1
0.1
0.05
0.05
Version
hydraulic
Measuring range
psi 1)
2.9 … 1,000
14.5 … 5,000 29 … 10,000
29 … 15,000
Required weights
kg
34
34
34
50
Smallest step
psi 2)
2
10
20
20
Nominal cross-sectional area of the piston
cm²
0.5
0.1
0.05
0.05
Accuracy 3)
% of reading
0.015 / optional: 0.008 4)
Instrument base version
 Pneumatic, low pressure
up to max. 10 bar / 150 psi; with internal pressure supply
 Pneumatic, high pressure/vacuum
up to max. 100 bar / 1,500 psi; for external supply and vacuum
 Hydraulic
up to max. 1,000 bar / 15,000 psi; with internal pressure supply
Connection of the piston cylinder system
M30 x 2 male thread / optional: ConTect quick connector
Connection for the test specimen
Quick connector G ½����������������������������������������������������������������
�� ���������������������������������������������������������������
B female thread as standard, freely rotating, changeable, (for
other threaded inserts, see accessories)
Pressure transmission medium
Oil reservoir
pneumatic clean dry non-corrosive gases (e.g. air or nitrogen)
hydraulic
Operating fluid (1 litre is included in delivery), other mediums on request
cm³
250
6 mm SWAGELOK® tube fitting; max. 110 % of the assigned measuring range;
only with instrument base version, pneumatic high pressure/vacuum
External pressure connection
Material
 Piston
Tungsten Carbide
 Cylinder
Tungsten Carbide
 Mass-set
Stainless steel 1.4305 and Aluminium, non-magnetic
 Piping in instrument base
pneumatic low pressure: flexible hose from polyurethane, 4 x 0.75 mm
pneumatic high pressure / vacuum: stainless steel1.4571, 3 x 1 mm
hydraulic: stainless steel 1.4404, 6 x 2 mm
Operating temperature
°C
18 … 28
 Instrument base pneumatic, low
pressure
 Instrument base pneumatic, high
pressure
kg
18.0 / 19.0 (incl. optional ConTect quick connector)
kg
18.0 / 19.0 (incl. optional ConTect quick connector)
 Instrument base hydraulic
kg
20.5 / 21.5 (incl. optional ConTect quick connector)
 Piston cylinder system
kg
1.5 / 5.7 (incl. bell and aluminium plate at optional ������������������
storage suit case�)
 BAR mass-set vacuum
kg
13.1 (incl. piston cylinder system at carrying case)
 BAR basic mass-set, pneumatic
kg
16.2 (incl. carrying case)
 BAR mass-set extension, pneumatic
kg
14.0 (incl. carrying case)
 BAR basic mass-set, hydraulic
kg
36.0 (incl. carrying case)
 BAR mass-set extension, hydraulic
kg
24.0 (incl. carrying case)
Weight
Page of 8
Mensor Data Sheet CPB5000B ∙ 09/2008
Continuation, Specifications
Model CPB5000
Weight
PSI mass-set vacuum
PSI basic mass-set, pneumatic
PSI mass-set extension 1, pneumatic
PSI mass-set extension 2, pneumatic
(only for 1,500 psi)
 PSI basic mass-set, hydraulic
 PSI mass-set extension, hydraulic
Dimensions
 Instrument base
 Carrying case for basic mass-set
 Carrying case for mass-set extension
 Carrying case for piston cylinder
system (optional)
Calibration




1)
2)
3)
4)
kg
kg
kg
kg
13.0 (incl. piston cylinder system at carrying case)
12.5 (incl. carrying case)
11.0 (incl. carrying case)
18.5 (incl. carrying case)
kg
kg
42.0 (incl. carrying case)
21.5 (incl. carrying case)
mm
mm
mm
mm
400 (W) x 375 (D) x 265 (H), for details see technical drawing
400 (W) x 310 (D) x 310 (H)
215 (W) x 310 (D) x 310 (H)
300 (W) x 265 (D) x 205 (H)
Factory calibration certificate (optional: DKD calibration certificate)
The starting value corresponds to the pressure value generated by the piston (by its own weight)
The lowest pressure change value that is reached based on the standard weight set. A fine weight set is also available for lower values.
The accuracy for the measured values above 10 % of the measurement range.
Measurement uncertainty assuming reference conditions (room temperature 20 °C, air pressure 1013 mbar, relative humidity 40 %). Corrections may be required for use without
CalibratorUnit.
CalibratorUnit Model CPU5000
The CPU5000 Calibrator Unit is a compact tool for use with a
deadweight tester. Particularly when highly-accurate measuring
values, with uncertainties of measurement of less than 0.025
%, are required, complicated mathematic calculations and
corrections are necessary. With the CPU5000 all critical ambient
parameters can be registered and automatically corrected.
Piston position display
By upgrading the CPU5000 with the extension for float position
indication, the piston position can be measured contact-free and
shown on the CalibratorUnit with high resolution.
Further specifications to CalibratorUnit CPU5000 see data sheet
CT 35.01.
Basis package CPU5000
The basic CalibratorUnit package converts masses into the
corresponding pressure value, or vice versa, it calculates the
masses required for a specific pressure value by considering
the local gravity on-site. The conversion can be carried out in
all common pressure units. The input of all parameters takes
place manually.
Sensor package
The sensor package extension includes sensors to automatically
register all critical parameters like room temperature, air pressure,
relative humidity and piston temperature and a continual updating
of the calculations possible.
Multimeter package
Furthermore with the multimeter package, a calibrator function
for pressure transmitters can be integrated, so that a voltage of
24 V DC can be supplied to the test item sensors and sensor
signals (V, mA) can be measured without any additional devices.
Besides the signal the automatically converted pressure value is
also shown on the display.
Deadweight tester CPB5000 with CalibratorUnit CPU5000
Order variants
CPU5000 Basis package (only processor)
 Calculation of the mass-loads
 Manual input of all parameters
Sensor package for measuring of:
 Ambient temperature
 Air pressure
 Air humidity
 Piston temperature
Multimeter package
 Power supply 24 V DC
 Measuring of output signal (V, mA) incl. conversion into pressure
values
Piston position display
 Contact-free measuring of piston position
Mensor Data Sheet CPB5000B ∙ 09/2008
Page of 8
Dimensions in mm
The drawing shows a pneumatic, high-pressure CPB5000 base with the ConTect quick-connect option.
The pneumatic low-pressure version and hydraulic version differ only in the arrangement of the control elements, and not
dimensionally.
Side view
Front view
4
6
3
8
Plan view
5
Connection for the test item
1
7
2
Changeable
threaded insert
Quick connection with
knurled nut
O-ring 8 x 2
Base low-pressure pneumatic
Base hydraulic
Plan view
Plan view
10
9
9
4
4
(1)
(2)
(3)
(4)
(5)
Adapter piston cylinder system
Adapter test item
Inlet-valve (only pneumatic high-pressure)
Outlet-valve
Spindle pump with star handle, removable
Page of 8
(6)
(7)
(8)
(9)
(10)
Test-pressure gauge
Water level
Rotating base
Inlet pressure pump
Oil reservoir screw plug
Mensor Data Sheet CPB5000B ∙ 09/2008
Accessories
Set of trim-masses
The weights included in the standard scope of delivery are
ideally suited for everyday use. If you would like to generate
intermediate values, however, we recommend using a set of
class F1 trim-masses, with the following weights:
1 x 50 g / 2 x 20 g / 1 x 10 g / 1 x 5 g / 2 x 2 g / 1 x 1 g /
1 x 500 mg / 2 x 200 mg / 1 x 100 mg / 1 x 50 mg /
2 x 20 mg / 1 x 10 mg / 1 x 5 mg / 2 x 2 mg / 1 x 1 mg
Set of trim-masses
Set of adapters for quick connection
As a standard, the deadweight tester is equipped with a quick
connector for connecting the test item. Various threaded adapters, which can be easily exchanged, are also available:
 Set of adapters: G ¼, G ⅜, ½ NPT, ¼ NPT and M20 x 1.5
 Set of adapters NPT: ⅛ NPT, ¼ NPT, ⅜ NPT and ½ NPT
Additionally the sets of adapters include spare O-rings as well
as a wrench, for exchanging the adapters.
Other threaded inserts are available on request.
Set of adapters
Dirt trap, purifier
For test objects that are very dirty, the use of a dirt trap is recommended in order to avoid the penetration of dirt particles into
the deadweight tester.
The purifier (without diaphragm) has been specially designed
for measuring instruments where the fill fluid should not come
into contact with the deadweight
������������������
tester�.
It is typically used with pneumatic ����������������������������
deadweight testers����������
when the
test media is water but also for pneumatic deadweight testers
(only with external pressure supply) for calibrating devices when
the medium is water or oil.
Fig. left: Purifier
Fig. right: Dirt trap
Description / Features
Order no.
Trim-masses (1 mg up to 50 g), class F1
Set of adapters for quick-connector, in a case with threaded inserts G ¼, G ⅜, ½ NPT, ¼ NPT and M20 x 1.5 for
fitting to the knurled nut of the test item connection.
Set of ”NPT“ adapters for quick-connection in a case with threaded inserts ⅛ NPT, ¼ NPT, ⅜ NPT and ½ NPT for
fitting to the knurled nut of the test item connection
Angle connection 90°, for test specimens with back mounting connection
Purifier, max. 800 bar
Dirt trap, -1 ... +400 bar
Dirt trap, -1 ... +1,000 bar
Set of O-rings consisting of 5 spare 8 x 2 and 5 spare 4 x 2.2
Operating fluid for CPB5000 up to 4,000 bar, 1 litre
Cleaning set for ConTect-systems, pneumatic version
Cleaning set for ConTect-systems, hydraulic version
Special test item admission with quick-connector�������������������������������������������������������
����������������������������������������������������������������������
, to the adaptation into the ConTect system admission,
operation as comparison test pump possible
7093874
2036941
Mensor Data Sheet CPB5000B ∙ 09/2008
12563626
1564838
1565389
2015820
2015714
12328562
2099882
12485943
12481425
2152634
Page of 8
Scope of supply
 Instrument base with dust cover
 Inlet pressure pump (not with pneumatic high-pressure/
vacuum base)
 Spindle pump for pressure generation/fine adjustment
 Piston adapter with M30 x 2 female thread
 Quick connection of test devices
 Piston cylinder system with bell jar
 Basic mass set in the carrying case
 Mass-set extension in carrying case (dependent on the
measuring range)
 Mass-set manufactured to standard gravity
(9.80665 m/s²)
 Operating fluid 1.0 litre (only for hydraulic version)
 Operating instructions in German and English
 Factory calibration certificate
Options





Systems with increased accuracy to 0.01 %
Piston adapter with ConTect quick-connect
Storage suit case for piston cylinder systems
Mass-set manufactured to local gravity
DKD calibration certificate
Further Deadweight testers within our Calibration Technology Program
Deadweight tester Model CPB3000
Measuring ranges
 hydraulic:
60 bar up to 1,000 bar
1,000 psi up to 15,000 psi
Accuracy
0.025 % of reading
High-Pressure Deadweight tester Model CPB5000HP
Pressure Balance Model CPB3000
Measuring ranges
 hydraulic:
2,500 bar or 4,000 bar
40,000 psi or 60,000 psi
Accuracy
0.025 % of reading
0.02 % of reading (optional)
Differential Deadweight tester Model CPB5000DP
Measuring ranges
(= static line pressure + differential pressure):
 pneumatic: 2 bar up to 100 bar
30 psi up to 1,500 psi
 hydraulic:
60 bar up to 1,000 bar
1,000 psi up to 15,000 psi
Accuracy
0.015 % of reading
0.01 % of reading (optional)
High-Pressure Deadweight tester Model CPB5000HP
Differential Deadweight Tester Model CPB5000DP
Specifications and dimensions given in this leaflet represent the state of engineering at the time of printing.
Modifications may take place and materials specified may be replaced by others without prior notice.
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Mensor Data Sheet CPB5000B ∙ 09/2008
Mensor Corporation
201 Barnes Dr
San Marcos, TX 78666
Tel.
(512) 396-4200
Fax
(512) 396-1820
E-mail sales@mensor.com
www.mensor.com
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