Calibration
WIKA data sheet CT 31.11
Page 1 of 15
WIKA data sheet CT 31.11
∙ 03/2020
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 for dierential pressure; model CPB5600DP; see data sheet CT 31.56
CalibratorUnit; model CPU6000; see data sheet CT 35.02
Hydraulic pressure balance
Model CPB5800
Hydraulic pressure balance, model CPB5800
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 CPB5800 is ideal
for on-site use for maintenance and service.
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 calibrated according to UKAS
accreditation.
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 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
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
WIKA data sheet CT 31.11 ∙ 03/2020 Page 2 of 15
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 lb/in²]
■
Dual-range piston-cylinder system for measuring ranges
700 bar, 1,200 bar and 1,400 bar [10,000, 16,000 and
20,000 lb/in²]
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. This
pairing 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.
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.
As an option the model CPS5000 hydraulic piston-cylinder
systems are available.
For detailed specications see data sheet CT 31.01.
1
Eective area A
2
High-pressure piston
3
Low-pressure piston = High-pressure cylinder
The piston-cylinder system model CPS5800
Pressure p
Force F
1
Single-range piston-cylinder system, model CPS5800
Force F
Pressure p
2
3
Dual-range piston-cylinder system, model CPS5800