Chemistry

Vacuum distillation

OktaLine® ATEX
Explosion-proof Roots pumps

Vacuum furnaces

OktaLine® ATEX
Explosion-proof Roots pumps

Hermetically sealedfor maximum
operational safety

Your added value

Explosion-proof due topressure surge resistanceto PN 16

ATEX approval for use in rough and fine vacuum
OktaLine Roots pumps are the right choice for processes
in potentially explosive atmospheres or for evacuating
explosive gases. Thanks to conformity to ATEX Directive
2014/34/EU1) and pressure surge resistance to PN16, theymeet the highest requirements for explosion protection.
Hermetically sealed for maximum operational reliability
Thanks to their magnetic coupling with non-metallic separating can, OktaLine pumps are hermetically sealed and achieve
lowest leakage rates of 10-6 Pa m3/s. Zone entrainment of explosive gases is thus excluded. The integrated temperature
sensor protects against thermal overload. This monitors thegas temperature in the outlet area.
Large pumping speed range
The nominal pumping speed of the series ranges from 280 to
8,100 m3/h. Depending on the application, a choice can bemade between equipment category 2G and 3G. All pumps are
suitable for temperature class T3 – in some cases T4 is also
possible. Since the pump has no effective ignition sources,
installation is possible without flame arresters. This meansthat the full pumping speed of the pump is effectively
available.

1)

Directive 1999/92/EC applies to the operator.

Technically dry operation

Higher performancewith a pumping speed
up to 8,100m³/h

Can be used individuallyfor ambient temperaturesfrom -20 °C to +40 °C

Protection against thermal
overload thanks to integrated
temperature sensorEasy installation andmaintenanceTechnically dry operation
The gear and bearing housings are separated from the pumping chamber by labyrinth seals. Contact-free rotation of theRoots ensures technically dry operation.
Flexible in application
Thanks to the variable differential pressure and flexible rotation speed, the pumps can be used universally. All pumps canbe used in ambient temperatures from -20 °C to +40 °C.
Low operating costs and easy maintenance
Compared to pumps with shaft seals, the magnetic couplingused ensures up to 20 % lower operating costs and significantly reduced maintenance costs. OktaLine pumps can also
be operated without an external bypass, as ATEX protection isguaranteed even in the case of passive windmilling. The useof explosion-proof motors according to IEC standard allows
quick and easy replacement on site.
Applications■ Chemical industry■ Pharmaceutical industry■ Automotive industry■ Heat treatment■■■Vacuum drying
Vacuum furnaces
Biotechnology

OktaLine® ATEX
ATEX regulations
Certification for ATEXThe word ATEX is an acronym from French and stands forATmosphères EXplosibles. Vacuum pumps for use in a
potentially explosive atmosphere must be certified inaccordance with 2014/34/EU. To do this, the measures
shown in Figure 1 must be carried out.
The first step is the analysis of potential ignition sources.
Depending on the category in the CE marking, the status
regular operation (category 3), expected failure (category 2)
and rare failure (category 1) are considered with regard topotential ignition sources. The next step is to prevent theseignition sources from becoming effective. The EN 1127-1
standard lists possible ignition sources that are examined aspart of the ignition hazard assessment.

Responsibilities according to guidelines forexplosion protection 94/9/EG and 99/92/EG
Safety precautions

Risk analysis

Evaluate the occurrence
probability of ignition sources

Temperature classT1 –450 °C
T2 –300 °CT3 –200 °C
T4 –135 °C

CategoryExplosion group
IIA
IIB
IIC
EthanCity gas
H
Propane Acrylonitrile
n-Butan EthyleneCHEO
C H OHpetrol, Ethyl glycol–fuel oilHS

Prevent explosive
atmosphere

2Avoid ignitionof atmosphere

3

Minimize the impactof an explosion

use ofATEX pumps

Avoid the effectivenessof ignition sources

CE-Marking

1

Classification of zones
according to the occurrenceof the explosive atmosphere1

Zone 0

Permanent, long-termor frequent2

Zone 1

To be expectedoccasionally3

Zone 2

Rarely and only
short-term

2222

52

CHO
2

4

Ethyl ether–Figure 1: Responsibilities according to Directives 2014/34/EU and 1999/92/EG

According to Directive 1999/92/EC, the operator is first obliged
to check whether the explosive atmosphere can be prevented.
This is the case if a critical quantity of combustible materialand sufficient oxidizing agents (usually oxygen) occur simultaneously. If this cannot be avoided, the second step is to prevent the atmosphere from igniting.
Operating principle of Roots pumps
Figure 2 shows the schematic structure of Roots pumps.
Inside them, two Roots (4) rotate in opposite directions. They
move the gas in the housing from the suction port (3) to thepressure port (11).

Operator responsibility – system concept

Manufacturer responsibility – Product design

Identify potentialignition sources

l5

83

2 7

1 Motor
2 Floating bearing
3 Suction connection
4 Roots
5 Labyrinth seal
6 Gearbox
7 Oil filler plug
8 Suction chamber
9 Oil level glass
10 Labyrinth seal
11 Pressure connection

1

104 1156Figure 2: Schematic design of a Roots vacuum pump9(3) to the pressure port (11). A motor (1) drives the main lobe.
The pair of gears (6) in the gear chamber synchronizes tworotors piston. Lubricants are used exclusively in the gear andbearing housings.
These are separated from the suction chamber (8) by alabyrinth seal (5). Narrow gaps between the piston andhousing ensure contact-free running. This allows operation
at high speed (1,500 – 4,500 rpm).
Heating of the pump
The pumped medium is neither compressed inside the Roots
pumps nor does an check-valve at the discharge connection
prevent backflow.
For this reason, there is a backflow of gas from the outlet into
the pumping chamber as soon as the position of the Roots
allows this. As a consequence, this backflow must also beconveyed against the outlet pressure. This effect leads to highenergy consumption, especially at high differential pressures
between inlet and outlet, which results in significant heatingof the pump.
Limiting the differential pressure
For technical reasons, standard Roots pumps cannot operate
against atmospheric pressure. With the aid of backing pumps,
the pressure at the outlet is kept sufficiently low. In thesmaller sizes, a built-in overflow valve prevents overheating bylimiting the differential pressure. This overflow valve opens
and closes an internal bypass connecting the suction anddischarge sides of the housing. The limitation of the differential pressure can also be achieved by operating the pumps
with a frequency converter. In this case, the speed of thepump is flexibly adapted to the operating conditions. Thanks
to these measures, the Roots pumps can already be switchedon at atmospheric pressure together with the backing pump.
This enables faster evacuation; it also makes the pump mucheasier to use.

OktaLine® ATEX
Dimensional drawings
Okta 500 ATEX
250
151520

5145

298
285

V

140170246

M

DN 100 PN 16

Ø180 (8x) M16-20 deep

180220Ø12 (4x)Ø102 H11 x 4.5 deep

260

382

277

210

max. 945

149.8

Ø102 H11 x 4.5 deep

DN 100 PN 160Ø22

Sealing groove
Inner Ø126
Outer Ø138
Depth 3.4 mm
M16 -20/22 deep (8x)
Ø1

ATEX temperature sensor

390

80

Okta 1000 ATEX

300
15151525205
115

402
385

B5

Ø12 (4x)

190
280
320
266

461

192

1122

A

Sealing groove
Inner Ø162
Outer Ø174
Depth 3,4 mm

DN 150 PN 16A

Ø339

DN 100 PN 16
Ø180 (8x M16)

180

194
230
294

28

540

Ø

0

Ø28x M16
DN 100 PN 1622390

Ø

M20 (8x)ATEX temperature sensor

Dimensions in mm

l7
Okta 2000 ATEX340

DN 100 PN 16300
360
420

Ø180250(8x M16-21/27 depth)

334
374

292

533

20210

24230
115

455

1544015Ø18 (4x)

210

1317

DN 150 PN 16A

Ø

Sealing groove
Inner Ø162
Outer Ø174
Depth 3,4 mm

A

220A

Ø

0
18M16 - 21/27 depth (8x)85

Ø2

M20 -24/31 depth (8x)

Ø240375

DN 100 PN 16

ATEX temperature sensor

202,5237(225)

450

374

Okta 5400 / 8100 ATEX

foot hole (4x)

657

583

Ø455

Ø305

vacuum flange

M24x3 - 30/36 deep (4x)1787,4

M24x3 - 37/43 deep (8x)Dimensions in mm

OktaLine® ATEX
Pumping speed

S [m³/h]Okta 500 ATEX
1,000100

Okta 500 ATEX (60 Hz)
Okta 500 ATEX (50 Hz)
Okta 500 ATEX (25 Hz)

Backing
pump120120m³/hm3/hBacking pump
100.001

0.01

0.1

1101001000

p [hPa]S [m³/h]Okta 1000 ATEX

10,0001,000

100

Okta 1000 ATEX (60 Hz)
Okta 1000 ATEX (50 Hz)
Okta 1000 ATEX (25 Hz)

Backing
pump300
300m³/hm3/hBacking pump
100.001

0.01

0.1

1

10100

1000

p [hPa]l9

S [m³/h]Okta 2000 ATEX
10,0001,000

Okta 2000 ATEX (60 Hz)Okta 2000 ATEX (50 Hz)
Okta 2000 ATEX (25 Hz)

Backing
pump630630m³/hm3/hBacking pump
1000.01

0.1

1101001000

p [hPa]S [m³/h]Okta 5400 / 8100 ATEX

10,0001,000

Okta 8100 ATEX (75 Hz)
Okta 8100 ATEX (60 Hz)
Okta 5400 ATEX (50 Hz)
Okta 5400 ATEX (38 Hz)
Okta 5400 ATEX (25 Hz)

Backingpump
Backing pump
100
0.01

0.1

1

10100

1000

p [hPa]OktaLine® ATEXTechnical data
Technical data
VersionEquipment category
Nominal pumping speed
Pumping speed range
Pumping speed at 60 Hz
Rated speed
Speed min.
Max. speed
Connection flange (inlet)
Connection flange (output)
Weight: with motor
Leak rate
Ambient temperature
Cooling type, standard
Operating medium1)
Operating medium quantity
Emission sound pressure level (EN ISO2151) at intake pressure 10 hPa
Emission sound pressure level (EN ISO2151) at intake pressure 1 hPa
Nominal power 50 Hz
Rated power 60 Hz
Mains connection: Voltage 50 Hz
Mains connection: Voltage 60 Hz
Motor protection
Protection classOkta 500 ATEXOkta 1000 ATEXOkta 2000 ATEX
ATEX with motor and magnetic coupling,
blocked overflow valve
2G2) or 3G3)
560 m3/h
1,180 m3/h
2,155 m3/h
280 – 670 m3/h
590 – 1,420 m3/h
1,080 – 2,585 m³/h
670 m³/h
1,420 m³/h
2,585 m³/h
3,000 min-1
1,500 min-1
3,600 min-1
DN 100 PN 16
DN 150 PN 16
DN 150 PN 16
DN 100 PN 16
DN 100 PN 16
DN 100 PN 16
154 kg
255 kg390 kg1 · 10-6 Pa m3/s
5 – 40 °C (-20 – +40 °C)AirP3
1.5 l.
2,9 l
5l
75 dB (A)70 dB (A)72 dB (A)72 dB (A)

1.5 kW
1.8 kW

3.0 kW
3.5 kW230/400 V
265/460 V
3TF
IP 55

5.5 kW
6.3 kW

Okta 2000 ATEX

Order numbers
Okta 500 ATEXOkta 1000 ATEXOkta ATEX (3G)

PP W33 3003)

PP W43 3003)

PP W63 3003)

Okta ATEX (2G)

PP W33 4002)

PP W43 4002)

PP W63 4002)

1)

Other equipment and motor voltages on request.
Classification according to ATEX Directive 2014/34/EU: II 2/2G IIB T3 Gb +5 °C ≤ Ta ≤ +40°C
3)Classification according to ATEX Directive 2014/34/EU: II 3/3G IIB T3 Gc +5 °C ≤ Ta ≤ +40°C
4)Classification according to ATEX Directive 2014/34/EU: II 2/2G IIC T4…T2 Gb +5 °C ≤ Ta ≤ +40°C2)

l 11

Okta 5400 ATEXOkta 8100 ATEX
ATEX with motor and magnetic coupling
without overflow valve
2G4) or 3G4)
5,400 m3/h
8,100 m3/h
2,700 – 8,100 m³/h
6,480 m³/h
3,000 min-1
4,500 min-1-1
1,500 min4,500 min-1
DN 250 PN16
DN 250 PN16
DN 250 PN16
DN 250 PN16
790 kg810 kg1 · 10-6 Pa m3/s
-20 – +40 °C
Water
H13l79 dB(A)74 dB(A)
11 kW
11 kW

18.5 kW18.5 kW
400/690 V–3x PTC
IP 55

Okta 5400 ATEXOkta 8100 ATEX––PP V60 393 1004)

PP V61 393 1004)

Okta 8100 ATEX

8,100 m3/h
Nominal pumping speed

1·10-6 Pa m³/s
Leak rate

Errors excepted. All data subject to change without prior notice. PW 0042 PEN (May 2022/PoD)

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