KNF N 820.3 FT.40.18, N 860.3 FT.40.18, N 840.3 FT.40.18, N 842.3 FT.40.18 Operating Instructions Manual
Operating Instructions
Read and observe these Operating Instructions!
N 820.3 FT.40.18
N 840.3 FT.40.18
N 842.3 FT.40.18
N 860.3 FT.40.18
Contents Page
Self Drying Pumps
KNF Neuberger GmbH
Alter Weg 3
79112 Freiburg
Germany
Phone +49-(0)7664 / 5909-0
Fax +49-(0)7664 / 5909-99
E-Mail: info@knf.de
www.knf.de
KNF 121350-121429 11/18
Translation of original Operating Instructions, english Keep for future use!
1. About this document ................................................................. 3
2. Use ............................................................................................ 4
3. Safety ........................................................................................ 5
4. Technical Data .......................................................................... 7
5. Design and Function ............................................................... 12
6. Installation and connection ...................................................... 15
7. Operation ................................................................................. 16
8. Servicing .................................................................................. 21
9. Troubleshooting....................................................................... 29
10. Spare parts .............................................................................. 31
11. Returns .................................................................................... 31
12. Health and safety clearance and decontamination form ......... 33
Laboratory vacuum pumps N 8__.3 FT.40.18 About this document
A danger warning is located here.
Possible consequences of a failure
warning are specified here. The signal word, e.g.
Warning, indicates the danger level.
Signal word
Meaning
Consequences if not observed
DANGER
warns of immedi-
Death or serious injuries
WARNING
warns of possible
Death or serious injuries
possible.
CAUTION
warns of a possibly
Minor injuries or damage are
This symbol refers to important information.
Project pumps
1. About this document
1.1. Using the Operating Instructions
The Operating Instructions are part of the pump.
Carefully study the Operating Instructions before using a
pump.
Always keep the Operating Instructions handy in the work
area.
Pass on the Operating Instructions to the next owner.
Customer-specific project pumps (pump models which begin with
“PJ” or “PM”) may differ from the Operating Instructions.
For project pumps, also observe the agreed upon specifica-
tions.
1.2. Symbols and Markings
Warning
to observe the
WARNING
Measures for avoiding the danger and its conse-
quences are specified here.
Danger levels
ate danger
danger
dangerous situation
Tab. 1
Other information and symbols
An activity to be carried out (a step) is specified here.
and/or serious damage are the
consequence.
and/or serious damage are
possible.
Translation of original Operating Instructions, English, KNF 121350-121429 11/18 3
1. The first step of an activity to be carried out is specified here.
Additional, consecutively numbered steps follow.
Use Laboratory vacuum pumps N 8__.3 FT.40.18
Operating parameters and
Requirements for
Drying systems
Accessories
2. Use
2.1. Proper use
The pumps are exclusively intended for transferring gases and
vapors.
Owner's responsibility
Only install and operate the pumps under the operating parameters
conditions
transferred medium
and conditions described in chapter 4, Technical data.
Make sure that the installation location is dry and the pump is
protected against rain, splash, hose and drip water.
Before using a medium, check whether the medium can be transferred danger-free in the specific application case.
Before using a medium, check the compatibility of the materials of
the pump head, diaphragm and valves with the medium.
Only transfer gases which remain stable under the pressures and
temperatures occurring in the pump.
Ensure that the entry of air into the pump during venting (drying
system) could not result in the creation of reactive, explosive or
otherwise hazardous mixtures (e.g. with the medium).
Laboratory equipment or additional components connected to a
pump have to be suitable for use with the pneumatic capabilities of
the pump.
2.2. Improper use
The pumps and the drying system may not be operated in an
explosive atmosphere.
The pumps are not suitable for transferring dusts.
The pumps are not suitable for transferring liquids.
The pumps must not be used to create vacuum and overpressure
simultaneously.
An overpressure must not be applied to the suction side of the
pump.
4 Translation of original Operating Instructions, English, KNF 121350-121429 11/18
Laboratory vacuum pumps N 8__.3 FT.40.18 Safety
Note the safety precautions in chapters 6. Installation and
connection,
Personnel
Working in a safety-
Fig. 1: Notice sticker
Handling dangerous media
Handling flammable media
Environmental protection
3. Safety
conscious manner
The pumps are built according to the generally recognized rules of
technology and in accordance with the occupational safety and
accident prevention regulations. Nevertheless, dangers can result
during their use which lead to injuries to the user or others, or to
damage to the pump or other property.
Only use the pumps when they are in a good technical and proper
working order, in accordance with their intended use, observing the
safety advice within the operating instructions, at all times.
Make sure that only trained and instructed personnel or specially
trained personnel work on the pumps. This especially applies to
assembly, connection and servicing work.
Make sure that the personnel has read and understood the operating instructions, and in particular the "Safety" chapter.
Observe the accident prevention and safety regulations when
performing any work on the pump and during operation.
Do not expose any part of your body to the vacuum.
Open housing parts with notice sticker (see fig. 1) only after
separating mains plug from power source.
and 7. Operation.
When transferring dangerous media, observe the safety regula-
tions when handling these media.
Be aware that the pumps are not designed to be explosion-proof.
Make sure the temperature of the medium is always sufficiently
below the ignition temperature of the medium, to avoid ignition or
explosion. This also applies for unusual operational situations.
Note that the temperature of the medium increases when the pump
compresses the medium.
Hence, make sure the temperature of the medium is sufficiently
below the ignition temperature of the medium, even when it is
compressed to the maximum permissible operating pressure of the
pump. The maximum permissible operating pressure of the pump
is stated in the technical specifications (see chapter 4).
If necessary, consider any external sources of energy, such as
radiation, that may add heat to the medium.
In case of doubt, consult the KNF customer service.
Store all replacement parts in a protected manner and dispose of
them properly in accordance with the applicable environmental
protection regulations. Observe the respective national and international regulations. This especially applies to parts contaminated
with toxic substances.
Translation of original Operating Instructions, English, KNF 121350-121429 11/18 5
Safety Laboratory vacuum pumps N 8__.3 FT.40.18
Standards
Customer service and
The pumps conform to the Directive 2011/65/EU (RoHS2).
The pumps conform to the safety regulations of the Directive
2014/30/EU concerning Electromagnetic Compatibility and the
Directive 2006/42/EC concerning Machinery.
The following harmonized standards have been used:
DIN EN 61010-1
DIN EN 61326-1 - class A
DIN EN 50581
The pumps correspond to IEC 664:
the overvoltage category II
the pollution degree 2.
Only have repairs to the pump carried out by the KNF Customer
repairs
Service responsible.
Only authorized personnel should open those parts of the housing
that contain live electrical parts.
Use only genuine parts from KNF for servicing work.
6 Translation of original Operating Instructions, English, KNF 121350-121429 11/18
Laboratory vacuum pumps N 8__.3 FT.40.18 Technical Data
All pumps are secured against overheating with a thermal
switch and are equipped with a mains fuse.
Component
Pump material
Pump head
PTFE
Diaphragm
PTFE coated
Valve
FFPM
Refer to the type plate for the pump’s electrical configuration.
4. Technical Data
Pump materials
Tab. 2
Translation of original Operating Instructions, English, KNF 121350-121429 11/18 7
Technical Data Laboratory vacuum pumps N 8__.3 FT.40.18
Pneumatic performance
Max. permissible operating
1.0
Ultimate vacuum [mbar abs.]
10
Delivery rate at atm. pressure
20
Pneumatic connections
Hose connection [mm]
ID 10
Ambient and media temperature
Permissible
+ 5 °C to + 40 °C
Permissible media tempera-
+ 5 °C to + 40 °C
Other parameters
Weight [kg]
9.6
Dimensions : L x H x W [mm]
312 x 220 x 177
Maximum permissible ambient
80 % for temperatures up to
Max. altitude of site
2000
Electrical Data
Voltage [V]
100
115
230
Frequency [Hz]
50/60
60
50
Max. operating current [A]
1.8
1.2
0.7
Power consumption pump [W]
130
130
120
Maximum permitted mains
+/- 10 %
+/- 10 %
+/- 10 %
Fuse pump
3.15
2.5
1.6
Protection class motor
IP44
N 820.3 FT.40.18
pressure [bar g]
[l/min]*
ambient temperature
ture
relative humidity
31 °C, decreasing linearly to
50 % at 40 °C
[m above sea level]
voltage fluctuations
(2x) T [A]
Tab. 3 * Liters in standard state (1,013 mbar)
8 Translation of original Operating Instructions, English, KNF 121350-121429 11/18
Laboratory vacuum pumps N 8__.3 FT.40.18 Technical Data
Pneumatic performance
Max. permissible operating
1.0
Ultimate vacuum [mbar abs.]
10
Delivery rate at atm. pressure
34
Pneumatic connections
Hose connection [mm]
ID 10
Ambient and media temperature
Permissible
+ 5 °C to + 40 °C
Permissible media tempera-
+ 5 °C to + 40 °C
Other parameters
Weight [kg]
12.9
Dimensions : L x H x W [mm]
341 x 239 x 189
Maximum permissible ambient
80 % for temperatures up to
Max. altitude of site
2000
Electrical Data
Voltage [V]
100
115
230
Frequency [Hz]
50/60
60
50
Max. operating current [A]
4.4
3.2
1.5
Power consumption pump [W]
220
250
245
Maximum permitted mains
+/- 10 %
+/- 10 %
+/- 10 %
Fuse pump
6.3
6.3
3.15
Protection class motor
IP44
N 840.3 FT.40.18
pressure [bar g]
[l/min]*
ambient temperature
ture
relative humidity
31 °C, decreasing linearly to
50 % at 40 °C
[m above sea level]
voltage fluctuations
(2x) T [A]
Tab. 4 * Liters in standard state (1,013 mbar)
Translation of original Operating Instructions, English, KNF 121350-121429 11/18 9
Technical Data Laboratory vacuum pumps N 8__.3 FT.40.18
Pneumatic performance
Max. permissible operating
1.0
Ultimate vacuum [mbar abs.]
4
Delivery rate at atm. pressure
34
Pneumatic connections
Hose connection [mm]
ID 10
Ambient and media temperature
Permissible
+ 5 °C to + 40 °C
Permissible media tempera-
+ 5 °C to + 40 °C
Other parameters
Weight [kg]
13.7
Dimensions : L x H x W [mm]
341 x 242 x 189
Maximum permissible ambient
80 % for temperatures up to
Max. altitude of site
2000
Ambient and media temperature
Permissible
+ 5 °C to + 40 °C
Permissible media tempera-
+ 5 °C to + 40 °C
Electrical Data
Voltage [V]
100
115
230
Frequency [Hz]
50/60
60
50
Max. operating current [A]
4.4
3.2
1.5
Power consumption pump [W]
260
290
245
Maximum permitted mains
+/- 10 %
+/- 10 %
+/- 10 %
Fuse pump
6.3
6.3
3.15
Protection class motor
IP44
N 842.3 FT.40.18
pressure [bar g]
[l/min]*
ambient temperature
ture
relative humidity
31 °C, decreasing linearly to
50 % at 40 °C
[m above sea level]
ambient temperature
ture
voltage fluctuations
(2x) T [A]
Tab. 5 * Liters in standard state (1,013 mbar)
10 Translation of original Operating Instructions, English, KNF 121350-121429 11/18
Laboratory vacuum pumps N 8__.3 FT.40.18 Technical Data
Pneumatic performance
Max. permissible operating
1.0
Ultimate vacuum [mbar abs.]
4
Delivery rate at atm. pressure
60
Pneumatic connections
Hose connection [mm]
ID 12
Ambient and media temperature
Permissible
+ 5 °C to + 40 °C
Permissible media tempera-
+ 5 °C to + 40 °C
Other parameters
Weight [kg]
14.8
Dimensions : L x H x W [mm]
331 x 278.5 x 291
Maximum permissible ambient
80 % for temperatures up to
Max. altitude of site
2000
Electrical Data
Voltage [V]
100
115
230
Frequency [Hz]
50/60
60
50
Max. operating current [A]
4.8
2.7
1.6
Power consumption pump [W]
260
240
220
Maximum permitted mains
+/- 10 %
+/- 10 %
+/- 10 %
Fuse pump
6.3
6.3
3.15
Protection class motor
IP54
N 860.3 FT.40.18
pressure [bar g]
[l/min]*
ambient temperature
ture
relative humidity
31 °C, decreasing linearly to
50 % at 40 °C
[m above sea level]
voltage fluctuations
(2x) T [A]
Tab. 6 * Liters in standard state (1,013 mbar)
Translation of original Operating Instructions, English, KNF 121350-121429 11/18 11
Design and Function Laboratory vacuum pumps N 8__.3 FT.40.18
1 Connection piece
2
3
4
5
6
7
8
9
1 Inlet (suction side)
10
11
12
5. Design and Function
Design N 820.3 FT.40.18 , N 840.3 FT.40.18 , N 842.3 FT.40.18
Pneumatic connection
Pump head
Outlet (pressure side)
Inlet (suction side)
Power switch pump
Venting valve
Power switch drying system
Control box
2 Outlet (pressure side)
3 Pneumatic connection
4 Connection piece
5 Pump head
6 Power switch pump
7 Connecting box
8 Fan cover
9 Power switch drying system
Control box
Pump head
Venting valve
12 Translation of original Operating Instructions, English, KNF 121350-121429 11/18
Fig. 2: Diaphragm pump (shown: pump N 840.3 FT.40.18, symbolic)
Design N 860.3 FT.40.18
Fig. 3: Diaphragm pump N 860.3 FT.40.18
Laboratory vacuum pumps N 8__.3 FT.40.18 Design and Function
1 Outlet valve
2
3
4
5
6
7
Function Diaphragm Pump
Inlet valve
Transfer chamber
Diaphragm
Eccentric
Connecting rod
Pump drive
Fig. 4: Pump head
Diaphragm pumps transfer, compress (depending on pump version) and evacuate gases and vapors.
The elastic diaphragm (4) is moved up and down by the eccentric
(5) and the connecting rod (6). In the downward stroke it aspirates
the gas to be transferred via the inlet valve (2). In the upward
stroke, the diaphragm presses the medium out of the pump head
via the outlet valve (1). The transfer chamber (3) is hermetically
separated from the pump drive (7) by the diaphragm.
Description, Operating Conditions
Where gases of high humidity have to be evacuated condensation
may collect in the pump head; as a result, the effectiveness of the
pump decreases.
Thanks to the drying system it is possible during evacuation to
blow the condensed liquid out of the pump heads at high speed,
while maintaining the vacuum in the recipient at a constant level.
After drying the pump heads the pumps achieve a greatly improved
vacuum and evacuate much faster than pumps without a drying
system.
The drying system utilizes the pressure difference between the
transfer chamber (fig. 4/3) and the surrounding atmosphere.
The venting valve (fig. 2/7 or fig. 3/12) at suction side pump head is
opened by the control system, permitting air to enter the evacuated
pump head. As a result of the increase in pressure in the pump
head, the inlet valve of the first pump head closes by itself, thereby
sealing off the connection to the source being evacuated.
By contrast, the outlet valve and both valves of the second pump
head now open automatically; the condensation is expelled from
the pump head at high speed.
Pumps can operate with or without the drying system. The drying
system is activated by a switch on the control box. If the drying
system remains switched off the pumps operate in the conventional way.
Translation of original Operating Instructions, English, KNF 121350-121429 11/18 13
Design and Function Laboratory vacuum pumps N 8__.3 FT.40.18
The control for the drying system is effected via three variables:
The time between switching on the drying system and the first
ventilation of the pump heads (t
)
1
The duration of the ventilation of the pump heads (t
)
2
The interval between pump head ventilation operations (t
to t3 standard values are set in the factory.
For t
1
t
= 210 sec
1
t
= 2.0 sec
2
t
= 40 sec
3
In addition to this, the drying process can also be individually
adapted to a process sequence. To do this, the values for t
can be altered (see chapter 7.4). The pump must be discon-
and t
3
1
nected from the electricity mains beforehand.
3
, t2,
).
14 Translation of original Operating Instructions, English, KNF 121350-121429 11/18
Laboratory vacuum pumps N 8__.3 FT.40.18 Installation and connection
A marking on the pump head shows the direction of flow.
Dimensions
Cooling air supply
Installation location
Connected components
Pump exhaust
Connection
6. Installation and connection
Only install the pumps under the operating parameters and conditions described in chapter 4, Technical data.
Observe the safety precautions (see chapter 3).
6.1. Installation
Before installation, store the pump at the installation location to
bring it up to room temperature.
See chapter 4, Technical data, for the dimensions of pump.
Install the pump so that the motor fan can intake sufficient
cooling air.
Make sure that the installation location is dry and the pump is
protected against rain, splash, hose and drip water.
Choose a safe location (flat surface) for the pump.
Protect the pump from dust.
Protect the pump from vibration and jolt.
6.2. Connection
Only connect components to the pump which are designed for
the pneumatic data of the pump (see chapter 4).
If the pump is used as a vacuum pump, safely discharge the
pump exhaust at the pump’s pneumatic outlet.
1. Remove the protective plugs from the pneumatic connectors of
the pump.
2. Connect the suction line and pressure line.
3. Lay the suction and pressure line at a downward angle to
prevent condensate from running into the pump.
4. At the end of the pressure line, install a container for collecting
the condensation that is drained from the pump.
5. Insert the power cable’s plug into a properly installed
shockproof socket.
Translation of original Operating Instructions, English, KNF 121350-121429 11/18 15
Operation Laboratory vacuum pumps N 8__.3 FT.40.18
Operational requirements
Pump
All hoses attached properly
Hazard of the pump head bursting due to excessive
pressure increase
Only throttle or regulate the air or gas quantity in
Excessive pressure (with all of the related hazards) can be
prevented by placing a bypass line with a pressure
between the pressure and suction side of the pump. For further
inform
7. Operation
7.1. Preparing for Start-up
Before switching on the pump, observe the following points:
Fan openings not blocked
Specifications of the power supply correspond with
the data on the pump’s type plate.
The pump outlet is not closed or constricted.
Container at the end of pressure line.
Tab. 7
7.2. Starting
Only operate the pump under the operating parameters and
conditions described in chapter 4, Technical data.
Make sure the pump is used properly (see chapter 2.1).
Make sure the pump is not used improperly (see chapter 2.2).
Observe the safety precautions (see chapter 3).
WARNING
Do not exceed max. permissible operating
pressure (see chapter 4).
Monitor pressure during operation.
If the pressure exceeds the maximum permissi-
ble operating pressure, immediately shut down
pump and eliminate fault (see chapter 9. Troubleshooting).
the suction line to prevent the maximum permissible operating pressure from being exceeded.
If the air or gas quantity in the pressure line is
throttled or regulated, make sure that the maximum permissible operating pressure of the
pump is not exceeded.
-relief valve
ation, contact your KNF technical adviser.
16 Translation of original Operating Instructions, English, KNF 121350-121429 11/18
Laboratory vacuum pumps N 8__.3 FT.40.18 Operation
Reactive mixtures can cause personal injury and
pump damage.
During the drying process of pump heads these are
vented by the vent valve.
Automatic starting can cause personal injury and
pump damage
When the operation of the pump is interrupted by the
thermal switch, the pump will restart automat
after cooling down.
the
event of power failure, remove the pump’s mains
Pump standstill
WARNING
With the pump at a standstill, open pressure and suction lines
to normal atmospheric pressure.
WARNING
Before starting a pump, if the air is supplied via
the vent valve ensure that there is no risk of the
formation of reactive, explosive or otherweise
hazardous mixtures. (Use inert gas where
appropriate).
After triggering of the thermal protection or in
plug from the socket so that the pump cannot
start uncontrollably.
Attempt work on the pump only if the pump is
separated from mains power.
ically
Translation of original Operating Instructions, English, KNF 121350-121429 11/18 17
Operation Laboratory vacuum pumps N 8__.3 FT.40.18
The pump may not start up against pressure during switch-on.
This also applies in operation following a brief power failure.
a pump starts against pressure, it may block. This activates the
thermal switch, and the pump switches off.
The drying system will only work with the pump switched on.
The drying system should only be switched on if a container
has been attached to the pressure line of the pump which will
catch the condensate; otherwise the condensate will flow out
uncontr
When the drying system is switched on, the time period t1 (time
until the first venting of the pumps heads) will begin. If it is
intended that t
system should be switched on before the pump.
For the variables t1 to t3 of the drying system, see chapter 7.4.
7.3. Switching pump on and off
Switching pump on
Make sure that no pressure is present in the lines during
switch-on.
Switch on pump with mains switch (see fig. 2 or 3).
If cyclic drying of the pump heads is required in the current
evacuation process, switch the drying system on at the mains
switch of the control box (see fig. 2 or 3).
olled.
should run from the pump starting, the drying
1
If
Switching off the pump/removing from operation
Purge the pump including the connecting hoses with air (if
necessary for safety reasons: with an inert gas) at full flow rate
for about 5 minutes (see chapter 8.2.1).
If the drying system is switched on: Switch the drying system
off at the main switch of the control box (see fig. 2 or fig. 3).
Switch off pump with mains switch (see fig. 2 or 3).
Open pressure and suction lines to normal atmospheric pres-
sure.
Disconnect the power source.
18 Translation of original Operating Instructions, English, KNF 121350-121429 11/18
Laboratory vacuum pumps N 8__.3 FT.40.18 Operation
Switch setting
Switch 1
Switch 2
Switch 3
0
t3
1.0
10.0
1
60.0
1.5
15.0
2
90.0
2.0
25.0
3
120.0
2.5
40.0
4
150.0
3.0
60.0
5
180.0
3.5
120.0
6
210.0
4.0
180.0
7
240.0
5.0
300.0
8
300.0
7.5
600.0
9
360.0
10.0
900.0
Switch
Switch setting
Time in sec
1
6
210.0
2
2
2.0
3
3
40.0
Extreme danger from electrical shock!
ly before working
The control box may only be opened if there is no risk of
moi
Drying system control box
Changing settings
7.4. Drying system: Changing settings
The variables of the drying system can be adapted to a process
sequence.
: Time between switching on the drying system and the first
t
1
ventlation of the pump heads
t
: Duration of the ventilation of the pump heads.
2
t
: The interval between pump head ventilation operations.
3
.
Fig. 5: Control box (opened) of
drying system with switches 1, 2, 3
Fig. 6: Switch for setting the drying
system
Tab. 8: Variables and values
Tab. 9: Work setting
t1 in sec
t2 in sec
t3 in sec
DANGER
1. Disconnect the pump from the mains by pulling the plug out of
2. Check that the pump and the drying system are dead and
3. At the control box, loosen the collar nut of the cable inlet. Use
Translation of original Operating Instructions, English, KNF 121350-121429 11/18 19
Disconnect the pump power supp
on the pump.
Make sure the pump is de-energized and secure.
the socket.
secure them.
a slotted screwdriver to release the four screws, then fold the
cover forwards and lay it down (see fig. 5).
sture precipitating on the control unit.
Operation Laboratory vacuum pumps N 8__.3 FT.40.18
4. Set the desired values at switches S1, S2, and S3 (see fig. 5).
See Table 8 for an explanation of the switches and for the values which can be set.
5. Replace the cover on the control box. Take care to ensure that
the seal is properly in place. Tighten the four screws of the
cover to finger tightness. Then tighten the collar nut of the cable inlet.
20 Translation of original Operating Instructions, English, KNF 121350-121429 11/18
Laboratory vacuum pumps N 8__.3 FT.40.18 Servicing
Component
Servicing interval
Pump
Regular inspection for external damage or
Diaphragm and
Replace at the latest, when pump output
When cleaning, make sure that no liquids enter the inside of
the housing.
8. Servicing
8.1. Servicing Schedule
leaks
valve plates/ sealings
Tab. 10
decreases
8.2. Cleaning
8.2.1. Flushing Pump
Before switching off the pump, flush it with air (if neccesary for
safety reasons: with an inert gas) for about five minutes under
atmospheric conditions (ambient pressure).
8.2.2. Cleaning Pump
Only use solvents for cleaning if the head materials cannot be
attacked (check the resistance of the material!).
If compressed air is available, blow out the components.
Translation of original Operating Instructions, English, KNF 121350-121429 11/18 21
Servicing Laboratory vacuum pumps N 8__.3 FT.40.18
Qty
Material
1
Service Set (see Chapter 10)
1
Phillips-head screwdriver No. 2
1
Felt-tip pen
Health hazard due to dangerous substances
in the pump!
Depending on the substance transferred, caustic
burns or poisoning are possible.
Conditions
Tools and material
Information on procedure
8.3. Changing Diaphragm and Valve
Plates/Sealings
8.3.1. N 820.3 FT.40.18, N 840.3 FT.40.18, N 842.3 FT.40.18
Pump is switched off and mains plug is removed from the
socket
Pump is clean and free of hazardous materials
Tubes removed from pump’s pneumatic inlet and outlet
Tab. 11
Always replace diaphragm and valve plates/sealings together
to maintain the pump performance.
With multi-head pumps, parts of the individual pump heads can be
confused.
Replace the diaphragm and valve plates/sealings of the indi-
vidual pump heads consecutively.
WARNING
Wear protective clothing if necessary, e.g.
protective gloves.
Flush pump before replacing the diaphragm and
valve plates/sealings (see chapter 8.2.1).
22 Translation of original Operating Instructions, English, KNF 121350-121429 11/18
Laboratory vacuum pumps N 8__.3 FT.40.18 Servicing
Pump N 842.3 FT.40.18 has a round shape of head, not a
hexag
In version N 842.3 FT.40.18, twelve (instead of three) screws
must be loosened in
The magnetic valve of the drying system remains fitted in this
situ
Replace the diaphragms of both pump heads consecutively in
order to ensure that the same number of diaphragm spacers is
used as before.
Removing pump head
Fig. 7: Removing pump head
onal.
1. On the pneumatic head connection (3), loosen the union nuts
(2) by hand. Then slightly loosen the angle-fitting (1) in the
pump head (4) by turning it anticlockwise, so that the connecting tube can be pulled out.
2. At both pump heads mark the position of top plate (fig. 10/5),
head plate (fig. 10/6), intermediate plate (fig. 10/8) and adapter
relatively to each other by a drawing line with a felt-tip pen.
This helps to avoid incorrect assembly later.
3. Loosen the outer screws (fig. 7/5) on the pump heads.
the next work step.
4. Carefully remove pump heads.
ation.
Change diaphragm
Fig. 8: Changing diaphragm
1. Push down one diaphragm until other diaphragm is pushed
upwards to its highest position.
2. Carefully unscrew the upper diaphragm (1) anti-clockwise
using both hands.
3. Replace spacer thick (2) and spacers thin (3) onto the screw
thread of the new diaphragm (same number and order).
4. Screw in the new diaphragm and tighten it by hand.
5. Carry out steps 1 to 4 for the second pump head.
Translation of original Operating Instructions, English, KNF 121350-121429 11/18 23
Servicing Laboratory vacuum pumps N 8__.3 FT.40.18
Replacing the valve plates/sealings of both pump heads
consecutively.
In version N 842.3 FT.40.18, three (instead of one) screws
must be loosened in the first work step.
In version N 842.3 FT.40.18, twelve (instead of three) screws
must be tightened in the next work step.
In version N 842.3 FT.40.18, three (instead of one) screws
must be tightened in the next work step.
Change valve plates/sealings
Fig. 9: Changing valve
plates/sealings
1. At one pump head: Loosen screw(s) (1) in the center of the top
plate (2).
2. Remove top plate (2) and head plate (3) from intermediate
plate (5).
Valve plates/sealings (4) are visible.
3. Remove old valve plate/sealings.
4. Clean intermediate plate (5) carefully (if there should be deposits in the recesses in the intermediate plate).
5. Insert new valve plates/sealings (4) in the recesses in the
intermediate plate (5).
6. Carry out steps 1 to 5 for the second pump head.
7. Dispose of the old diaphragms and valve plates/sealings
properly.
Refitting pump head
Fig. 10: Refitting pump head
1. At one pump head: Apply pressure all around the edge of the
diaphragm.
2. Place the intermediate plate (8) with valve plates/sealings on
the adapter in accordance with the felt-tip pen marking.
3. Place the head plate (6) on the intermediate plate (8) in the
position indicated by the guide pin (7).
4. Place the top plate (5) on the head plate (6) in accordance with
the felt-tip pen marking.
5. Gently tighten screws (4) in diagonal order (tightening torque:
N 820: 7 Nm; N 840/842: 8 Nm).
6. Insert screw(s) (1) with disk springs (2, 3) in the center of the
top plate (5). In doing so, make sure that the disk springs are
arranged properly (see fig. 10).
7. Screw in the screw/screws (1) in the centre of the pump top
plate (5) until it is flush with the top plate (they are flush with
the top plate); then screw one final half turn to tighten (tightening torque: 25 Ncm).
8. Carry out steps 1 to 7 for the second pump head.
9. Refit the pneumatic head connection: Place tube onto the
connecting part of the angle fitting, turn angle fitting to a
24 Translation of original Operating Instructions, English, KNF 121350-121429 11/18
Laboratory vacuum pumps N 8__.3 FT.40.18 Servicing
Spare part/tool
Service Set (according to chapter 10)
Philips screwdriver No. 2
Screwdriver, blade width 2 mm
Felt-tip pen
Health hazard due to dangerous substances
in the pump!
Depending on the substan
burns or poisoning are possible.
Conditions
Spare parts/tools
Information on procedure
straight position and tighten the union nut.
Final steps
1. Reconnect suction and pressure line to the pump.
2. Reconnect the pump to the electricity supply.
If you have any questions about servicing call your KNF technical
adviser (see last page for contact telephone number).
8.3.2. N 860.3 FT.40.18
Pump is switched off and mains plug is removed from the
socket
Pump is clean and free of hazardous materials
Tubes removed from pump’s pneumatic inlet and outlet
Tab. 12
Always replace diaphragm and valve plates/sealings together
to maintain the pump performance.
With multi-head pumps, parts of the individual pump heads can be
confused.
Replace the diaphragm and valve plates/sealings of the indi-
vidual pump heads consecutively.
WARNING
ce transferred, caustic
Wear protective clothing if necessary, e.g.
protective gloves.
Flush pump before replacing the diaphragm and
valve plates/sealings (see chapter 8.2.1).
Translation of original Operating Instructions, English, KNF 121350-121429 11/18 25
Servicing Laboratory vacuum pumps N 8__.3 FT.40.18
1 Valve plate/sealing
10
11
The magnetic valve of the drying system remains fitted in this
situation.
Replace the diaphragms of two-headed pumps consecutively
in order to ensure that the same number of diaphragm spacers
is used as before.
2 Top plate
3 Cross recessed raised
cheese head screw
4 Disk spring
5 Housing
6 Diaphragm
7 Diaphragm spacer(s)
8 Connecting rod
9 Intermediate plate
Head plate
Cross recessed raised
countersunk head screw
Fig. 11: Cross section of pump heads for pump N 860.3 FT.40.18 (sym
bolic)
Removing pump head
1. On the pneumatic head connections, loosen one of the union
nuts by hand. Then slightly loosen the angle-fitting in the pump
head by turning it anticlockwise, so that the connecting tube
can be pulled out
2. Undo the screws that hold the fan cover (see fig. 3/8, page 12)
and remove the fan cover from the motor.
3. At both pump heads make a mark (M) on the top plate (fig.
11/2), head plate (10), intermediate plate (9), and housing (5)
with a felt-tip pen. This is to ensure that the parts will be reassembled correctly at a later stage.
4. Undo the eight screws (11).
5. Lift the pump heads off the housing (5).
Changing diaphragm
1. Position the pump so that the diaphragm surface is upwards.
2. Turn the fan to bring one diaphragm (6) to top dead centre.
3. Using a small screwdriver, between the housing and the outer
edge of the diaphragm, carefully lift the edge of the diaphragm
lightly upwards at one point (making sure not to damage the
housing). Now grip the edge of the diaphragm on opposite
sides, unscrew it by turning anti-clockwise.
4. Take the diaphragm spacer(s) (7) off the connecting rod (8)
and retain them.
5. Check that all parts are free from dirt and clean them if necessary.
26 Translation of original Operating Instructions, English, KNF 121350-121429 11/18
Laboratory vacuum pumps N 8__.3 FT.40.18 Servicing
Replacing the valve plates/sealings of pump heads
consecutively.
6. Put the diaphragm spacer(s) (7) on the thread of the new
diaphragm.
7. Fit the new diaphragm (6): hold the connecting rod (8) with one
finger, and gently screw in (clockwise) the diaphragm with diaphragm spacers.
8. Turn the fan until the diaphragm is at the top dead centre.
Using a small screwdriver, between the housing and the outer
edge of the diaphragm, carefully lift the edge of the diaphragm
lightly upwards at one point. Now grip the edge of the diaphragm on opposite sides (do not overstretch the diaphragm!)
and tighten the diaphragm clock-wise.
9. Carry out steps 1 to 8 for the second pump head.
Changing valve plates/sealings
1. Undo the two screws (3).
2. Separate the head plate (10) with top plate (2) from intermediate plate (9).
3. Remove the valve plates/sealings (1) from the intermediate
plate.
4. Check that the valve seats, the head plate and intermediate
plate are clean. If scratches, distortion, or corrosion are evident
on these parts they should be replaced.
5. Lay the new valve plates/sealings (1) in the recesses in the
intermediate plate. The valve plates/sealings for suction and
pressure sides are identical, as are upper and lower sides of
the valve plates/sealings.
6. Carry out steps 1 to 6 for the second pump head.
7. Dispose of the old diaphragms and valve plates/sealings
properly.
Refitting pump head
Translation of original Operating Instructions, English, KNF 121350-121429 11/18 27
1. Turn the fan to bring the diaphragm (6) of one pump head to
medium position.
2. Place the intermediate plate (9), with valve plates/sealings (1),
on the housing, in the position indicated by the marking (M).
3. Place the head plate (10) on the intermediate plate (9) in the
position indicated by the marking (M).
4. Place top plate (2) in position and insert screws (3) with disk
springs (4), and tighten them until the screw heads are just fully seated (do not completely tighten them!).
Servicing Laboratory vacuum pumps N 8__.3 FT.40.18
The concave side of the first three disc springs must point
away from the screw head, the next three towards it (see fig.
11, detail X).
5. Gently tighten the screws (11), evenly and diagonally.
6. Turn the fan to check that the pump rotates freely.
7. Now tighten screws (11) hand-tight.
8. Tighten each of the screws (3) a half-turn more (tightening
torque: 20 Ncm).
9. Carry out steps 1 to 8 for the second pump head.
10. Refit the pneumatic head connection: Place tube onto the
connecting part of the angle fitting, turn angle fitting to a
straight position and tighten the union nut.
Final steps
1. Refit the fan cover.
2. Reconnect suction and pressure line to the pump.
3. Reconnect the pump to the electricity supply.
If you have any questions about servicing call your KNF technical
adviser (see last page for contact telephone number).
28 Translation of original Operating Instructions, English, KNF 121350-121429 11/18
Laboratory vacuum pumps N 8__.3 FT.40.18 Troubleshooting
Extreme danger from electrical shock!
Disconnect the pump power supply before working
Pump does not transfer
Cause
Fault remedy
No voltage in the power source
Check room fuse and switch on if necessary.
Thermal switch has operated
Disconnect pump from mains.
Connections or lines blocked.
Check connections and lines.
External valve is closed or filter
Check external valves and filters.
Condensate has collected in
Switch the drying system on or reduce t3 respectively (see
Diaphragm or valve plates/
Replace diaphragm and valve plates/sealings (see chapter
Flow rate, pressure or vacuum too low
Cause
Fault remedy
Condensate has collected in
Switch the drying system on or reduce t3 respectively (see
There is gauge pressure on
suction side.
Change the pressure conditions.
Pneumatic lines or connection
Disconnect pump from system to determine output values.
necessary.
Leaks occur on connections,
Check that tubes sit correctly on hose nozzles.
Connections or lines completely
Check connections and lines.
Head parts are soiled.
Clean head components.
Diaphragm or valve plates/
Replace diaphragm and valve plates/sealings (see chapter
9. Troubleshooting
on the pump.
DANGER
Check the pump (see Tab. 13 to 16).
Make sure the pump is de-energized and secure.
following to over-heating.
is clogged.
pump head.
sealings are worn.
The pump does not achieve the output specified in the Technical data or the data sheet.
pump head.
pressure side and at the same
time vacuum or a pressure
above atmospheric pressure on
Allow pump to cool.
Trace cause of over-heating and eliminate it.
Remove blockage.
chapter 7.4 with regard to changing the value which has
been set)
8.3).
Tab. 13
chapter 7.4 with regard to changing the value which has
been set)
parts have an insufficient cross
section.
lines or pump head.
or partially clogged.
sealings are worn.
Translation of original Operating Instructions, English, KNF 121350-121429 11/18 29
Eliminate throttling (e.g. valve) if necessary.
Use lines or connection parts with larger cross section if
Replace leaky tubes.
Eliminate leaks.
Remove the clogging parts and particles.
8.3).
Troubleshooting Laboratory vacuum pumps N 8__.3 FT.40.18
Flow rate, pressure or vacuum too low
Cause
Fault remedy
Replaced diaphragms and valve
Check that the spacers have been replaced onto the dia-
Pump is switched on, but does not run, the on/off-switch on the pump is not lit
Cause
Fault remedy
Pump is not connected with the
Connect pump to mains power.
No voltage in the power source
Check room fuse and switch on if necessary.
Fuse in the pump is defective.
Remove pump’s mains plug from the socket.
Pump is switched on, but does not run, the on/off-switch on the pump is lit
Cause
Cause
The thermal switch has opened
Remove pump´s mains plug from the socket.
The pump does not achieve the output specified in the Technical data or the data sheet.
plates/sealings
power source.
phragm screw thread.
Check head connection and hose connections for leaks.
Possibly carefully tighten the outer screws (fig. 10/4 or 11/11)
of the top plate crosswise.
Tab. 14
All pumps except for N 860.3 FT.40.18:
Loosen marked lid on underside of the pump.
Pump N 860.3 FT.40.18:
Open connecting box of the pump (see fig. 3/7).
Select and replace suitable fuse (see chapter 4).
Tab. 15
due to overheating
Allow pump to cool.
Trace cause of over-heating and elimate it.
Tab. 16
Fault cannot be rectified
If you are unable to determine any of the specified causes, send
the pump to KNF Customer Service (see last page for the address).
1. Flush the pump to free the pump head of dangerous or aggressive gases (see chapter 8.2.1).
2. Clean the pump (see chapter 8.2.2).
3. Send the pump, together with completed Health and Safety
Clearance and Decontamination Form (Chapter 12), to KNF
stating the nature of the transferred medium.
30 Translation of original Operating Instructions, English, KNF 121350-121429 11/18
Laboratory vacuum pumps N 8__.3 FT.40.18 Spare parts
Service set for pump
Order-No.
N 820.3 FT.40.18
057358
N 840.3 FT.40.18
057359
N 842.3 FT.40.18
057359
N 860.3 FT.40.18
047499
Pump type
Order-No. head plate
Order-No. intermediate plate
Head 1
Head 2
Head 1
Head 2
N 820.3 FT.18
025848
027108
057278
057278
N 840.3 FT.18
025883
027195
057176
057176
N 842.3 FT.18
042370
042369
058088
058088
N 860.3.FT.18
045981
045982
049601
046132
Pump type
Order-No. head plate
Order-No. intermediate plate
Head 1
Head 2
N 820.3 FT.18
304249
304252
304246 (2x)
N 840.3 FT.18
304250
304253
304247 (2x)
10. Spare parts
10.1. Service Sets
A Service Set contains all replacement parts needed for one complete service:
2 diaphragms
4 valve plates/sealings
Tab. 17
10.2. Head plates and intermediate plates (white)
Tab. 18
10.3. Head plates and intermediate plates (black)
Tab. 19
Translation of original Operating Instructions, English, KNF 121350-121429 11/18 31
Returns Laboratory vacuum pumps N 8__.3 FT.40.18
11. Returns
Pumps and systems used in laboratories and process-based
industries are exposed to a wide variety of conditions. This means
that the components contacting pumped media could become
contaminated by toxic, radioactive, or otherwise hazardous substances.
For this reason, customers who send any pumps or systems back
to KNF must submit a Health and safety clearance and decontamination form in order to avoid a hazardous situation for KNF employees. This Health and safety clearance and decontamination
form provides the following information, among other things:
physiological safety
whether medium-contacting parts have been cleaned
whether the equipment has been decontaminated
media that have been pumped or used
To ensure worker safety, work may not be started on pumps or
systems without a signed Health and safety clearance and decontamination form.
For optimal processing of a return, a copy of this declaration
should be sent in advance via e-mail, regular mail, or fax to KNF
Customer Service (refer to final page for address). In order to avoid
endangering employees who open the shipment's packaging,
despite any residual hazards, the original version of the Health and
safety clearance and decontamination form must accompany the
delivery receipt on the outside of the packing.
The template for the Health and safety clearance and decontamination form is included with these Operating Instructions and may
also be downloaded from the KNF website.
The customer must specify the device type(s) and serial number(s)
in the Health and safety clearance and decontamination form in
order to provide for the unambiguous assignment of the Declaration to the device that is sent to KNF.
In addition to the customer's declaration of physiological safety,
information about operating conditions and the customer's application are also of importance to ensure that the return shipment is
handled appropriately. Therefore, the Health and safety clearance
and decontamination form requests this information as well.
32 Translation of original Operating Instructions, English, KNF 121350-121429 11/18
Laboratory vacuum pumps N 8__.3 FT.40.18 Health and safety clearance and decontamination form
12. Health and safety clearance and decontamination form
Translation of original Operating Instructions, English, KNF 121350-121429 11/18 33
KNF worldwide
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