ATEX
14
GA03107_002_A4 - 09/2015 - © Oerlikon Leybold Vacuum
Operation Keeping below Limit Temperatures
Basic diagram:
Kompr
ession K
ef
f
Verdichtungsdruck p
v
am Druckstutzen (mbar)
p
const, T3
0,01
0,1
1
10
100
1000
p
const, T4
T4 - Einsatzgrenze
T3 - Einsatzgrenze
k
0: maximal mögliche Kompression einer Rootspumpe
p
max - Grenze
Diagram 1
k
o
: Maximum possible compression of a Roots pump
T4
- operating limit
T3
- operating limit
∆
p
max
- limit
Compr
ession
K
ef
f
Compression pressure p
V
at the discharge port (mbar)
Below a certain compression pressure p
v
≤ p
const, TX
the RUVAC WA/WAU ful-
fils at all times the requirements of temperature classification TX. When it is
ensured that this respective pressure is not exceeded and provided the back-
ing pump system is capable of supplying the specified pumping speed at all
times, then no temperature monitoring for the Roots pump will be necessary.
The intake pressure p
a
then results from the ATEX-specific forevacuum pres-
sures p
const, TX
given in Table 2 and the effective compression ratio k
eff
. If k
eff
is
not known, it is recommended to use k
th
.
Nominal pumping speed RUVAC
Nominal pumping speed backing pump
k
th
=
k
th
= Theoretical compression ratio
Содержание RUVAC WA
Страница 67: ...Notes 67 GA03107_002_A4 09 2015 Oerlikon Leybold Vacuum ...
Страница 68: ...68 GA03107_002_A4 09 2015 Oerlikon Leybold Vacuum EC Declaration of Conformity ...
Страница 69: ...69 GA03107_002_A4 09 2015 Oerlikon Leybold Vacuum EC Incorporation Declaration ...
Страница 71: ...Index 71 GA03107_002_A4 09 2015 Oerlikon Leybold Vacuum ...