Pfeiffer Vacuum ONF 16 M User manual

Translation of the original instructions
Operating Instructions
EN
PK 0213 BEN/L (1412)
ONF 16 M / 25 M, ONF 25 L/XL
Oil Mist Filter

Table of contents
2
Table of contents
1 About this manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Validity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Proper use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Improper use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Transport and storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Product description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.1 Product identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.2 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.2 Installing the operating fluid return line . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7.1 Draining the operating fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7.2 Changing the filter element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
8 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
9 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
10 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
10.1 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
11 Spare parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
11.1 Spare parts packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
12 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

About this manual
3
1 About this manual
1.1 Validity
This operating manual is for customers of Pfeiffer Vacuum. It describes the functioning
of the designated product and provides the most important information for safe use of
the unit. The description follows applicable EU guidelines. All information provided in this
operating manual refers to the current state of the product's development. The documen-
tation remains valid as long as the customer does not make any changes to the product.
Up-to-date operating instructions can also be downloaded from
www.pfeiffer-vacuum.com.
1.2 Conventions
Safety instructions The safety instructions in Pfeiffer Vacuum operating instructions are the result of risk
evaluations and hazard analyses and are oriented on international certification stan-
dards as specified by UL, CSA, ANSI Z-535, SEMI S1, ISO 3864 and DIN 4844. In this
document, the following hazard levels and information are considered:
Pictographs
DANGER
Imminent danger
Indicates an imminent hazardous situation that will result in death or serious injury.
WARNING
Possibly imminent danger
Indicates an imminent hazardous situation that can result in death or serious injury.
CAUTION
Possibly imminent danger
Indicates an imminent hazardous situation that can result in minor or moderate injury.
NOTICE
Command or note
Command to perform an action or information about properties, the disregarding of
which may result in damage to the product.
Prohibition of an action or activity in connection with a source of danger,
the disregarding of which may result in serious accidents
Warning of a displayed source of danger in connection with operation of
the unit or equipment
Command to perform an action or task associated with a source of dan-
ger, the disregarding of which may result in serious accidents

4
Safety
Instructions in the
text
Work instruction: here you have to do something.
Abbreviations ONF: Oil mist filter
ORF: Oil return device
2Safety
2.1 Safety precautions
Before carrying out any work read and observe the operating and safety instructions
of the pumping station and the individual components.
Observe the safety and accident prevention regulations.
Check regularly that all safety precautions are being complied with.
When returning the components to us please note the instructions in the Service sec-
tion.
2.2 Proper use
Only use the oil mist filter to filter oil mist from the gas flow of rotary vane pumps.
Simply mount the ONF onto the exhaust port of rotary vane pumps.
Use the ONF in accordance with the corresponding approved pumping speed.
2.3 Improper use
Improper use will cause all claims for liability and warranties to be forfeited. Improper use
is defined as usage for purposes deviating from those mentioned above, especially:
connection to pumps or units which are not suitable for this purpose according to their
operating instructions
connection to units which have exposed voltage-carrying parts
use of accessories or spare parts, which are not named in this manual
Important information about the product or this document
Duty to inform
Each person involved in the installation or operation of the unit must read and observe
the safety-related parts of these operating instuctions.
The operator is obligated to make operating personnel aware of dangers originating
from the unit or the entire system.

Transport and storage
5
3 Transport and storage
3.1 Storage
The ONF should be stored dry and protected from moisture. The filter inserts can absorb
moisture, and the lubrication properties of the oil and hence the ultimate pressure can be
negatively influenced in pumps with an oil return unit.
4 Product description
4.1 Product identification
To correctly identify the product when communicating with Pfeiffer Vacuum, always have
the information from the rating plate available.
●Model and model number
●Date of manufacture
Fig. 1: Product identification on the rating plate (example)
Variants
Connection nominal diameter
Mod.:
Mod.-No.:
Made in Germany 2008/03
ONF 025
PK Z40 157
D-35614 Asslar
Type Connection nominal diameter intended for pump type
ONF 16 M DN 16 ISO-KF UNO 2.5, UNO 5, DUO 1.3, DUO 2.5, DUO 5 M
DUO 1.6/3/6/11
ONF 25 M DN 25 ISO-KF DUO 10 M, Penta 10
ONF 25 L DN 25 ISO-KF UNO 30, DUO 20 M, Penta 20, TWIN 20-10
ONF 25 XL DN 25 ISO-KF Penta 35

6
Product description
4.2 Function
The oil mist filter is mounted on the exhaust connection of rotary vane pumps. It prevents
air pollution from operating fluid mist that is ejected by the pump to a greater or lesser
degree depending on the operating pressure.
The filter inserts are installed in a housing made of corrosion-resistant aluminum and
consist of a cylindrical filter of glass polyester fleece. The filter inserts are opened by an
incorporated pressure relief valve when the contamination becomes excessive so that
the maximum working pressure of 1500 hPa (absolute) cannot be exceeded. The collect-
ed operating fluid can be observed through a sight glass and discharged with a drain
screw.
Fig. 2: ONF 16 M / 25 M
Operatingfluidreturn
line If the operating fluid accumulated in the ONF reaches a specified level, the operating flu-
id is channeled via differential pressure back into the rotary vane pump. Condensate con-
centrates underneath the oilpan and has to be drained when necessary so as not to im-
pair the operation of the pump
2 Housing ONF
4 Cover
10 Connection flange
(exhaust flange of rotary vane
pump)
12 Sight glass
30 O-ring
33 Operating fluid drain screw
2
33
12
30 10 4

Installation
7
5 Installation
5.1 Assembly
To install the ONF in a vacuum system, ISO small flanges or ISO clamp flanges are pro-
vided on the input side and output side. The flanges are provided with protective caps
when delivered to protect the seals.
If gases are pumped that may not enter the atmosphere, an exhaust line must be con-
nected to the exhaust flange.
If large amounts of vapor arise during operation, it is recommendable to install a conden-
sate separator between the rotary vane pump and ONF so that condensate is removed
in the KAS, and only oil mist enters the ONF.
Remove the protective caps from the connection flanges.
Place the ONF on the exhaust side of the rotary vane pump with the sight glass facing
downward onto the flange, and fasten it with the clamping ring (accessory) or bracket
screws (accessory), if clamp flanges are used; observe centering ring (accessory).
Lay exhaust line from the ONF sloping downward so that no condensate can flow
back.
– If an air trap is created in the system, then a device for draining condensation water
must be provided at the lowest point.
WARNING
Poisonous substances exit from the exhaust!
There is a poisoning hazard from discharged gases or vapors that can be hazardous
and/or polluting during use.
Install and run the exhaust line so that overpressure cannot build up inside it.
Follow the vacuum pump installation instructions in the respective operating instruc-
tions.
NOTICE
Vacuum component
Dirt and damage impair the function of the vacuum component.
When handling vacuum components, ensure that they are kept clean and are protect-
ed against damage.
Ensure that the connection flange is clean, dry and free of grease.

8
Installation
5.2 Installing the operating fluid return line
ONF 16/25 M Turn off the vacuum pump, vent to atmospheric pressure and allow to cool, if neces-
sary.
Unscrew operating fluid drain screw 33.
Drain off operating fluid.
Separate the operating fluid from the condensate.
– If the drained operating fluid is free of contamination, it can be fed back to the rotary
vane pump.
Screw in hose piece 221 in place of the operating fluid drain screw; take care with O-
ring 145.
Remove gas ballast valve 42 from the pump and absorb the operating fluid under-
neath.
Re-fit the gas ballast valve 42 with intermediate flange 45 and screw tight with longer
screws ; take care with O-ring 148.
Screw fitting/hose nipple 220 into intermediate flange 45; pay attention to O-ring 138.
Fit operating fluid return hose 222 at both sides.
Fasten hose clips 223.
Fig. 3: DUO Rotary vane pump with ONF and operating fluid return line
ONF 25 XL Unscrew operating fluid drain screw 33.
Drain off operating fluid.
Separate the operating fluid from the condensate.
– If the drained operating fluid is free of contamination, it can be fed back to the rotary
vane pump.
NOTICE
Make sure that the return for the operating fluid works.
Operating fluid is only sucked in and returned starting from a minimum quantity of oper-
ating fluid in the ONF.
Top up with operating fluid in order to ensure the return of operating fluid at the start
of the evacuation phase.
33 Operating fluid drain screw
42 Gas ballast valve
45 Intermediate flange
138 O-ring
145 O-ring
148 O-ring
198 Operating fluid filler screw
rotary vane pump
220 Hose nipple
221 Hose piece
222 Operating fluid return
line
223 Hose clip
223
222
220, 223, (138)
45 (148)
ONF
198
42
33 (221/145)

Installation
9
Screw in hose piece 221 in place of the operating fluid drain screw; take care with O-
ring 145.
Unscrew and remove the union nut of the screw fitting 77 and remove the sealing plug
78.
Fit operating fluid return hose 222 at both sides.
Fasten hose clip 223.
Tighten the union nut of the screw fitting 77.
Fig. 4: PentaLine pump with ONF and Operating fluid return line
33 Operating fluid drain screw
77 Screw fitting
78 Sealing plug
145 O-ring
241 Hose piece
222 Operating fluid return line
223 Hose clip
223
222
33
(221/145) 77
(78)

10
Operation
6Operation
NOTICE
Damage to the pump due to condensate in the operating fluid!
Returned condensate generated by vapors or by temperature differences between the
oil mist filter and pump impairs the quality of the operating fluid and negatively impacts
the pump's final vacuum.
Drain operating fluid built up with condensate in a time manner.
NOTICE
Risk of the filter elements becoming blocked with resin!
When pumping gases and vapors with a tendency towards polymerization, the ONF fil-
ter elements can become resinified.
Observe the corresponding safety devices such as the saturation indicator or pres-
sure relief valve.
NOTICE
Make sure that the return for the operating fluid works.
Operating fluid is only sucked in and returned from an operating pressure of < 100 hPa
and starting from a minimum quantity of operating fluid in the ONF.
Long evacuation phases with a high intake pressure should always be followed by
operating phases with a lower operating pressure.

Maintenance
11
7 Maintenance
7.1 Draining the operating fluid
If the accumulated operating fluid in the ONF is above the top edge of the sight glass 12,
the operating fluid must be drained.
The intervals, at which the operating fluid is drained, depend on the operating conditions.
Check the operating fluid level in the sight glass.
Turn off the vacuum pump, vent to atmospheric pressure and allow to cool, if neces-
sary.
Ensure that the exhaust line is depressurized.
Screw out the operating fluid drain screw 33; pay attention to the O-ring 145.
Drain off operating fluid.
Screw in operating fluid drain screw 33; pay attention to O-ring.
Separate the operating fluid from the condensate.
– If the drained operating fluid is free of contamination, it can be fed back to the rotary
vane pump.
Dispose of condensate according to the respectively valid legal requirements.
Operatingfluidreturn
line Due to the automatic operating fluid return, it is not necessary to drain the operating fluid
manually.
However, depending on the process, filtered condensate in the oil sump should occa-
sionally be drained in the ONF, since it could enter the operating fluid return to the pump.
WARNING
Operating fluid may contain toxic substances from the pumped media!
Danger of poisoning from the emission of harmful substances from the operating fluid.
Wear suitable protective clothing and respirators.
Dispose of operating fluid according to the local regulations
WARNING
Toxic vapours!
Danger of poisoning when igniting and heating synthetic operating fluids (e.g. F4/F5)
above 300 °C.
Observe the application instructions.
Do not allow operating fluid to make contact with tobacco products; observe safety
precautions when handling chemicals.

12
Maintenance
7.2 Changing the filter element
The filter insert must be exchanged when the exhaust pressure increases until the pres-
sure relief valve opens inside the ONF and oil mist exits.
Dismantling
Fig. 5: ONF 16 M / 25 M (with ONF 25 XL 8.1 is a part of 8)
Turn off the vacuum pump, vent to atmospheric pressure and allow to cool, if neces-
sary.
Unscrew operating fluid drain screw 33.
Drain off operating fluid.
Separate the operating fluid from the condensate.
– If the drained operating fluid is free of contamination, it can be fed back to the rotary
vane pump.
Remove ONF from the system and pour out the remaining operating fluid.
Unscrew and remove the screws 32 and carefully detach the casing 2 from the cover
4;
– Caution! The parts are under preload.
Detach casing 2 and filter insert 8 and all other internally located parts from cover 4;
take care with O-rings 28 (not with ONF 25 XL) and 30.
Replace filter element 8; cleaning is not recommended in most cases.
WARNING
Contamination of parts and operating fluid by pumped media is possible.
Poisoning hazard through contact with materials that damage health.
In the case of contamination, carry out appropriate safety precautions in order to pre-
vent danger to health through dangerous substances.
Decontaminate affected parts before carrying out maintenance work.
2Casing
4 Cover
6 Casing of pressure relief valve
8 Filter insert
11 Deflector
12 Sight glass
14 Valve buffer
16 Pressure spring
18 Washer
20 Circlip
22 Compression spring
28 O-ring
30 O-ring
32 Screw
33 Operating fluid drain screw
4
30
33
12
222 20 16 628
8
11
18 14
32
28
8.1

Maintenance
13
Assembling is carried out in reverse order.
Dismantling the pressure relief valve
The pressure relief valve 8.1 at the ONF 25 XL is integrated in the filter insert 8 and can-
not be dismantled.
Loosen circlip 20 with pliers and dismantle washer 18, spring 16 and valve buffer 14
from valve housing 6.
Clean all parts and inspect for wear.
Check the sealed surface of valve buffer 14; replace if necessary.
– When assembling lightly oil valve buffer and ensure the correct seating in the valve
casing 6.
Assembling Continue assembly by reversing the dismantling sequence, paying particular attention to
compliance with the following steps.
Put up cover 4, opening facing upwards.
Lightly oil O-ring 28 (seal at ONF 25XL).
When mounting casing 2 ensure the correct seating of the filter insert 8 and of the
pressure relief valve casing 6; in particular take care with regard to the position of
compression spring 22 and O-rings 28 and 30.

14
Service
8 Service
Pfeiffer Vacuum offers first-class service!
●Fast replacement with exchange products in mint condition
●Advice on the most cost-efficient and quickest solution
Detailed information, addresses and forms at: www.pfeiffer-vacuum.com (Service).
Maintenance and repairs in the Pfeiffer Vacuum ServiceCenter
The following steps are necessary to ensure a fast, smooth servicing process:
Download the forms "Service Request" and "Declaration on Contamination".1)
Fill out the "Service Request" form and send it by fax or e-mail to your Pfeiffer Vacuum
service address.
Include the confirmation on the service request from Pfeiffer Vacuum with your ship-
ment.
Fill out the declaration on contamination and include it in the shipment (required!).
Drain off operating fluid.
If possible, send pump or unit in the original packaging.
Sending of contaminated pumps or devices
No units will be accepted if they are contaminated with micro-biological, explosive or ra-
dioactive substances. “Hazardous substances” are substances and compounds in ac-
cordance with the hazardous goods directive (current version). If pumps are contaminat-
ed or the declaration on contamination is missing, Pfeiffer Vacuum performs
decontamination at the shipper's expense.
Neutralise the pump by flushing it with nitrogen or dry air.
Close all openings airtight.
Seal the pump or unit in suitable protective film.
Return the pump/unit only in a suitable and sturdy transport container and send it in
while following applicable transport conditions.
Service orders
All service orders are carried out exclusively according to our repair conditions for vacu-
um units and components.
1) Forms under www.pfeiffer-vacuum.com

Accessories
15
9 Accessories
10 Technical data
Designation ONF 16 M
Oil return unit from ONF 16 M to Duo 1.6, 3, 6, 11 PK 006 080 -T
Oil return unit from ONF 16 M to Duo 5 M, from ONF 25 M to Duo 10 M, from ONF 25
L to Duo 20 M, standard version
PK 196 172 -T
Designation ONF 25 M
Oil return unit from ONF 25 M, 25 L, 25 XL to Penta PK 198 545 -T
Oil return unit from ONF 16 M to Duo 5 M, from ONF 25 M to Duo 10 M, from ONF 25
L to Duo 20 M, standard version
PK 196 172 -T
Designation ONF 25 L
Oil return unit from ONF 25 L to Uno 30 M, standard version PK 196 944 -T
Oil return unit from ONF 25 M, 25 L, 25 XL to Penta PK 198 545 -T
Oil return unit from ONF 16 M to Duo 5 M, from ONF 25 M to Duo 10 M, from ONF 25
L to Duo 20 M, standard version
PK 196 172 -T
Designation ONF 25 XL
Oil return unit from ONF 25 M, 25 L, 25 XL to Penta PK 198 545 -T
Parameter ONF 16 M ONF 25 M ONF 25 L ONF 25 XL
Degree of separation 99.98 % 99.98 % 99.98 % 99.98 %
Flange (in) DN 16 ISO-KF DN 25 ISO-KF DN 25 ISO-KF DN 25 ISO-KF
Flange (out) DN 16 ISO-KF DN 25 ISO-KF DN 25 ISO-KF DN 25 ISO-KF
Pressure max. (absolute) 1500 hPa 1500 hPa 1500 hPa 1500 hPa
For pumping speed 12 m3/h 12 m3/h 30 m3/h 42 m3/h
Capacity 0.15 l 0.15 l 0.25 l 0.35 l
Weight 1.35 kg 1.4 kg 1.6 kg 1.9 kg

16
Technical data
10.1 Dimensions
Fig. 6: ONF 16 M / 25 M
Fig. 7: ONF 25 XL
Maße ONF 16 M ONF 25 M ONF 25 L
A 142 mm 147 mm 218 mm
B 80mm 80mm 80mm
C 120 mm 132 mm 134 mm
D 127 mm 127 mm 182 mm
E 16mm 16mm 25mm
F 105 mm 105 mm 105 mm
G 17mm 23mm 27mm
H48mm48mm
B
H
AE
D
F
C
G
23 28
E
C
B
105
DN 25 ISO-KF
DN 25 ISO-KF
F3
D
A
G

Spare parts
17
11 Spare parts
The spare parts packages listed here are only applicable for standard models.
Please state all information on the rating plate when ordering spare parts. Other spare
parts than those described in this manual must not be used without the agreement of
Pfeiffer Vacuum.
11.1 Spare parts packages
ONF 16 M / 25 M
ONF 25 L
Fig. 8: ONF 16 M / 25 M, ONF 25 L
Spare parts package Model No. Consisting of
Maintenance kit ONF 16 M PK E37 001 -T 8, 28, 30
ONF 25 M PK E37 001 -T 8, 28, 30
PK E37 003 -T 8, 28, 30ONF 25 L
Overhaul kit ONF 25 XL PK E37 100 -T 8, 30
ONF 16 M PK E37 002 -T 8, 12, 14, 16, 18, 20, 22, 28, 30, 33
ONF 25 M PK E37 002 -T 8, 12, 14, 16, 18, 20, 22, 28, 30, 33
ONF 25 L PK E37 004 -T 8, 12, 14, 16, 18, 20, 22, 28, 30, 33
ONF 25 XL PK E37 101 -T 8, 12, 22, 24, 30, 33
4
30
33
12
222 20 16 628
8
11
18 14
32
28
8.1

18
Disposal
ONF 25 XL
Fig. 9: ONF 025 XL
12 Disposal Products or parts thereof (mechanical and electrical components, operating fluids, etc.)
may cause environmental burden.
Safely dispose of the materials according to the locally applicable regulations.
11
10
2
32
33
30
8
4
22
12
24

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