14 Technical data and dimensions
14.1 General
Basis for the technical data of Pfeiffer Vacuum roots pumps
●
Specifications according to PNEUROP committee PN5
●
ISO 21360-1: 2016 “Vacuum technology - Standard methods for measuring vacuum-pump per-
formance - General description”
●
Leak test to ascertain the integral leakage rate according to EN 1779: 1999 technique A1; with
100 % helium concentration, 10 s measurement duration
●
Sound pressure level: distance to vacuum pump 1 m
mbar bar Pa hPa kPa Torr | mm Hg
mbar 1
1 · 10
-3
100 1 0.1 0.75
bar 1000 1
1 · 10
5
1000 100 750
Pa 0.01
1 · 10
-5
1 0.01
1 · 10
-3
7.5 · 10
-3
hPa 1
1 · 10
-3
100 1 0.1 0.75
kPa 10 0.01 1000 10 1 7.5
Torr | mm Hg 1.33
1.33 · 10
-3
133.32 1.33 0.133 1
1 Pa = 1 N/m
2
Tbl. 9: Conversion table: Pressure units
mbar l/s
Pa m
3
/s
sccm Torr l/s
atm cm
3
/s
mbar l/s 1 0.1 59.2 0.75 0.987
Pa m
3
/s
10 1 592 7.5 9.87
sccm
1.69 · 10
-2
1.69 · 10
-3
1
1.27 · 10
-2
1.67 · 10
-2
Torr l/s 1.33 0.133 78.9 1 1.32
atm cm
3
/s
1.01 0.101 59.8 0.76 1
Tbl. 10: Conversion table: Units for gas throughput
Special versions
The technical data and dimensions for the vacuum pump refer to the specified standard
version.
●
For deviations in special versions, please refer to the rating plates or the enclosed in-
formation.
14.2 Technical data
Type designation Okta 250 Okta 250 M
Version Standard with motor Standard with motor and
magnetic coupling
Differential pressure at the overflow valve 75 hPa 75 hPa
Connection flange (in) DN 63 ISO-F DN 63 ISO-F
Connection flange (out) DN 63 ISO-F DN 63 ISO-F
Nominal pumping speed 145 – 440 m³/h 145 – 440 m³/h
Nominal pumping speed at 50 Hz 290 m³/h 290 m³/h
Nominal pumping speed at 60 Hz 350 m³/h 350 m³/h
Input voltage 50 Hz 230 / 400 V 230 / 400 V
Input voltage 60 Hz 265 / 460 V 265 / 460 V
Input voltage: tolerance ±5 % ±5 %
Technical data and dimensions
49/54
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