Datasheet

12
462
m kg kilogram
s m
t s
A m
2
V m
3
v m/s
a m/s
2
J kgm
2
F N newton = kg · m/s
2
G N newton = kg · 9.82
W J = kg · m
2
/s
2
M Nm
P W watt = J/s = Nm/s
p Pa pascal = N/m
2
V
n
m
3
n
Q
n
m
3
n
/s
10
–6
0.000 001 µ
10
–3
0.001 m
10
–2
0.01 c
10
–1
0.1 d
10
1
10 da
10
2
100 h
10
3
1 000 k
10
6
1 000 000 M
0.4 MPa
0.3 MPa
0.2 MPa
0.1 MPa
Subject to change
SI UNITS, SYMBOLS AND DIMENSIONING
Quantity Symbol Unit symbol Unit name Comments
Basic units
Mass
Length meter
Time second
Derived units
Area square meter
Volume cubic meter
Velocity meter per second
Acceleration meter per second squared
Inertia kilogram square meter
Force
Weight
Energy (work) joule (= newtonmeter)
Moment newtonmeter
Effect
Derived units related to compressed air
Pressure
Standard volume normal cubic meter
Volume ow normal cubic meter per second
SI units and designations
The SI system is based on seven basic units that can be combined
to derived units. Here are the units that are common in pneumatics.
I
n Europe, the SI system is used since a long time,
and it is introduced in more than one hundred coun-
tries worldwide. The abbreviation “SI” is French and
is read Système International d’Unités – that is “The
International System of Units”.
Prex
In the SI system, the units are made larger or smaller by
using a prex to indicate orders of magnitude.
Common prexes are found in the table on the right.
Units for pressure
Pressure in pascal (bar is an older term used less and
less). 1 bar = 100 000 Pa (pascal) = 100 kPa (kilopascal)
= 0.1 MPa (megapascal).
Pressure in physics
In physics, used absolute pressure (p abs), which means
that the scale begins with zero point at absolute vacuum.
Pressure in pneumatics
In pneumatics a scale is
used where zero is at at-
mospheric pressure and
–100 kPa at absolute vac-
uum. This is how we de-
ne air pressure in this
product overview.
Air in the normal state
is usually denoted by an
n after the device (for ex-
ample ln for normal liters).
Normal air has an atmos-
pheric pressure, is 20 °C
and has a relative humidity
of 65%. Popularly known
as “air in the room envi-
ronment”.
Exponent Multiplier Prex Symbol
micro-
milli-
centi-
deci-
deca-
hecto-
kilo-
mega-
(atmospheric
pressure)
Physics Meteorology Pneumatics
p = pressure
vacuum
1013 mbar
500 kPa
400 kPa
300 kPa
200 kPa
100 kPa100 kPa
0 kPa
4 bar
3 bar
2 bar
1 bar
0 bar
–1 bar
0 MPa
–100 kPa