KNF NF 25 Series User manual

KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions Keep for future reference!
DIAPHRAGM LIQUID PUMP
NF 25
, NFB 25
Operating and
Installation
Instructions
Read and observe these
Operating and Installation
Instructions!
An additional letter prefixing
the NF model code is a
country
-specific designation,
with no
technical relevance.
Contents Page
1. About this document................................................................. 2
2. Use........................................................................................... 3
3. Safety ....................................................................................... 4
4. Technical data.......................................................................... 6
5. Assembly and function ............................................................. 9
6. Installation and connection..................................................... 10
7. Operation................................................................................ 15
8. Servicing................................................................................. 19
9. Troubleshooting...................................................................... 22
10. Accessories............................................................................ 24
11. Decontamination declaration.................................................. 25
KNF Flodos AG
Wassermatte 2
6210 Sursee, Switzerland
Tel [phone]
Fax [phone]
www.knf-flodos.ch
[e-mail]
NF 25 KP DC-M 12V
DC-M / DCB / DCB-4 / DCB-B / DCB-4B
25
NF / NFB
Supply voltage [Ch. 4]
- / PMLxxxx / PLxxxx [Ch. 1]
KP / KT / TT [Ch. 4]

Diaphragm liquid pump NF 25, NFB 25 About this document
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 2
1. About this document
1.1. Use of the Operating and Installation Instruc-
tions
The Operating and Installation Instructions are part of the pump.
Forward the Operating and Installation Instructions to any
subsequent owners of the pump.
Customer-specific project pumps (pump models which begin with
"PL" or "PML") may differ from the Operating and Installation
Instructions.
In the case of project pumps, take note of any additionally
agreed specifications.
1.2. Symbols and markings
Warning
WARNING
This symbol indicates a potential danger.
It also indicates the possible consequences of failure
to observe the warning. The signal word (e.g. "Warn-
ing") indicates the level of danger.

Here you will see actions for avoiding the danger
and potential consequences.
Danger levels
Signal word
Meaning
Consequences if not observed
DANGER
warns of immedi-
ate danger
Consequences are death or
serious injury and/or serious
property damage.
WARNING
warns of potential
danger
Death or serious injury and/or
serious damage to property are
possible.
CAUTION
warns of a poten-
tially dangerous
situation
Minor injury or damage to prop-
erty are possible.
Tab. 1
Other information and symbols
This indicates a required activity (step).
1. This indicates the first step of a required activity. Additional
consecutively numbered steps follow.
This symbol indicates important information.
Project pumps

Diaphragm liquid pump NF 25, NFB 25 Use
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 3
2. Use
2.1. Intended use
The pumps are intended for transferring and metering liquids and
gases.
Owner's responsibility
Only install and operate the pumps under the operating parameters
and conditions described in Chapter 4, Technical data.
Only completely installed pumps may be taken into service.
Before transferring or metering 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, pump housing, diaphragm and valves with the
medium.
The temperature of the medium must lie within the permissible
temperature range (see Chapter 4).
The transferred medium should not contain particles as these can
prevent the pump from working correctly. If this cannot be guaran-
teed, a filter < 50 µm with sufficiently large filter area must be used
upstream of the pump.
Filters may be ordered as accessories, see Spare Parts and
Accessories (Chapter 10).
2.2. Improper use
Please contact your local KNF partner for special designs that
are not included in the technical specification (www.knf.com).
Operating parameters and
conditions
Requirements for
transferred medium
DANGER
The pumps must not be operated in an explosive
atmosphere.

Diaphragm liquid pump NF 25, NFB 25 Safety
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 4
3. Safety
Observe the safety precautions in Chapters
6. Installation and connection and 7. Operation.
The pumps are built according to the generally recognised rules of
technology and in accordance with the pertinent occupational
safety and accident prevention regulations. Nevertheless, dangers
may occur during their use which may 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 and Installation 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 all personnel have read and understood the Oper-
ating and Installation Instructions, and in particular the "Safety"
chapter.
Always ensure adherence to all pertinent accident prevention and
safety regulations when working on and operating the pump.
When transferring dangerous media, observe the safety regula-
tions for handling such media.
Always ensure adherence to all information stickers on the pumps,
such as flow direction arrows and type plates, and keep stickers in
legible condition.
All replacement parts should be properly stored and disposed of in
accordance with the applicable environmental protection regula-
tions. Observe the respective national and international regula-
tions. This especially applies to parts contaminated with toxic
substances.
Dispose of all packaging in an environmentally-appropriate
manner. The packaging materials are recyclable.
Dispose of end-of-life equipment in an environmentally
friendly manner. Use appropriate waste collection systems
for the disposal of end-of-life equipment. Used pumps
contain valuable recyclable materials.
Personnel
Working in a
safety-conscious manner
Handling dangerous media
Notes
Environmental protection
Disposal

Diaphragm liquid pump NF 25, NFB 25 Safety
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 5
The pumps comply with the fundamental requirements of Directive
2011/65/EU (RoHS2).
The pumps comply with the safety requirements regarding elec-
tromagnetic compatibility in Directive 2004/108/EC.
For the purposes of the Machinery Directive 2006/42/EC, pumps
are “partly completed machinery", and are therefore to be regarded
as not ready for use. Partly completed machinery may not be
commissioned until such time as it has been determined that the
machine in which the partly completed machinery is to be assem-
bled conforms to the provisions of the Machinery Directive
2006/42/EC. The essential requirements of Annex I of Directive
2006/42/EC (general principles) are applied and observed.
The following harmonised standards are met:
NF 25 DC-M
EN 55022
EN 55011
NF 25 DCB / DCB-4
EN 61000-6-2
EN 61000-6-3 (incl. EN 55022 / EN 55011)
NFB 25 DCB-B / DCB-4B
IEC/EN 61000-6-2
IEC/EN 61000-6-3
All repairs to the pump(s) must be carried out by the relevant KNF
customer service team.
Only use genuine parts from KNF for servicing work.
EU directives/standards
Customer service and repairs

Diaphragm liquid pump NF 25, NFB 25 Technical data
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 6
4. Technical data
Pump materials
The pump type KP stands for:
Assembly
Material1)
Pump head*
PP
Valve plate / seals
EPDM
Diaphragm
EPDM
Resonating diaphragm
EPDM
Tab. 2 1) according to DIN ISO 1629 and 1043.1
The pump type KT stands for:
Assembly
Material1)
Pump head*
PP
Valve plate / seals
FFKM
Diaphragm
PTFE-coated
Resonating diaphragm
FFKM
Tab. 3 1) according to DIN ISO 1629 and 1043.1
The pump type TT stands for:
Assembly
Material1)
Pump head*
PVDF
Valve plate / seals
FFKM
Diaphragm
PTFE-coated
Resonating diaphragm
FFKM
Tab. 4 1) according to DIN ISO 1629 and 1043.1
* The pump head (Fig. 1) comprises a connecting plate and an intermedi-
ate plate.
Hydraulic ratings
Parameter
Value
Flow rate NF 25 DC-M and DCB [ml/min] 1), 2)
250
Flow rate NF 25 DCB-4 [ml/min] 1), 2)
25-250
Flow rate NFB 25 DCB-4B [ml/min] 1), 2)
2x 50-300
Flow rate NFB 25 DCB-B [ml/min] 1), 2)
2x 300
Permissible pressure [bar g]
1
Suction head [mWG]
3
Tab. 5
1) Measured with water and using KNF standardised test equipement at
atmospheric pressure, KP pump head material
2) Flow rates may vary from the values shown, depending on fluid viscosi-
ty, ambient temperature, pump head material and the hoses / hose con-
nectors used.
Hydraulic connections
Parameter
Value
Recommended hose size ID [mm]
4
Tab. 6

Diaphragm liquid pump NF 25, NFB 25 Technical data
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 7
Specifications NF 25 DC-M
Motor voltage
12V
24V
Power consumption [W]
2.9
2.9
Max. I load [A]
0.24
0.12
Max. permissible current
consumption [A] 0.31 0.14
Lead size [-]
AWG22
Protection class [-]
IP30
Weight 1) [g]
64
Tab. 7
Specifications NF 25 DCB / DCB-4
Motor option
DCB-4
DCB 12V
DCB 24V
Supply voltage [V]
10…26.4
12
24
Power consump-
tion [W]
2.9 2.8 2.9
I load max. [A]
0.11…0.25
0.23
0.12
Lead size [-]
AWG28
Protection class
IP40
Weight 1) [g]
60
Tab. 8
In the case of type NF25 DCB-4, the supply voltage is not
designed for operation with pulse
-width modulated voltages
(PWM).
However, a PWM signal (frequency 1
-20kHz) can be used to
control the control
voltage.
Electrostatic sensitive components (ESD)
1) The weight may differ slightly from the stated value, depending on the
version

Diaphragm liquid pump NF 25, NFB 25 Technical data
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 8
Specifications NFB 25 DCB-B / DCB-4B
Motor option
DCB-4B
DCB-B
DCB-B
Supply volt-
age [V]
10…26.4 12 24
Power con-
sumption [W]
5.4 6.5 6.5
I load max. [A]
0.22…0.54
0.54
0.27
Protection
class
IP50
Weight 1) [g]
210
Tab. 9
In the case of type NFB25 DCB-4B, the supply voltage is not
designed for operation with pulse
-width modulated voltages
(PWM).
However, a PWM signal (frequency 1
-20kHz) can be used to
control the control voltage.
Electrostatic sensitive components (ESD)
1) The weight may differ slightly from the stated value, depending on the
version.
Other parameters
Parameter
Value
Permissible ambient temperature range [C]
+ 5 to + 40
Permissible media temperature [C]
+ 5 to + 80
Permissible kinematic viscosity of medium
[cSt]
≤ 150
Tab. 10
.

Diaphragm liquid pump NF 25, NFB 25 Assembly and function
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 9
5. Assembly and function
Assembly
1Outlet
2
Inlet
3
Connecting plate
4
Drive
5
Connecting leads
6
Head plate
7
Intermediate plate
Fig. 1: Micro diaphragm liquid pump NF 25
1 Outlet valve
2
Inlet valve
3
Working chamber
4
Diaphragm
5
Eccentric
6
Connecting rod
7
Pump drive
Fig. 2: Pump assembly
The diaphragm liquid pumps are based on reciprocating displace-
ment pump technology. The elastic diaphragm (4) is moved up and
down by the eccentric (5) and the connecting rod (6). In the down-
ward stroke it aspirates the medium to be transferred via the inlet
valve (2). In the upward stroke the diaphragm pushes the medium
out of the pump head via the outlet valve (1). The diaphragm
hermetically seals off the working chamber (3) from the pump drive
(7).
NFB 25 Version (double-headed pump, see Fig. 3)
This pump type has two NF25 pump heads that can be operated
individually or in parallel connection (see Chapter 0).
Fig. 3 : NFB 25
(double-headed pump)

Diaphragm liquid pump NF 25, NFB 25 Installation and connection
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 10
6. Installation and connection
Only install the pump under the operating parameters and condi-
tions 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 ambient temperature.
Mounting dimensions (see Fig. 4 to 6)
Fig. 4: Mounting dimensions NF 25 DC-M
Fig. 5: Mounting dimensions NF 25 DCB
Mounting dimensions

Diaphragm liquid pump NF 25, NFB 25 Installation and connection
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 11
Fig. 6: Mounting dimensions NF 25 DCB-4
Fig. 6: Mounting dimensions NFB 25 DCB-B
Fig. 8: Mounting dimensions NFB 25 DCB-4B
Make sure that the installation location is dry and the pump is
protected against water in the form of rain, spray, splashes and
drips.
Protect the pump against dust.
Protect the pump against vibration and impact.
Installation location

Diaphragm liquid pump NF 25, NFB 25 Installation and connection
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 12
Generally speaking, the pump can be installed in any position.
For maximum accuracy and rapid venting of one-headed
pumps, please install as shown in the illustration (Fig. 7).
Installation position
Fig. 9: Optimum installation
position for one-headed pumps:
horizontal

Diaphragm liquid pump NF 25, NFB 25 Installation and connection
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 13
6.2. Electrical connection
Only have the pump connected by an authorized specialist.
Only have the pump connected when the power supply is
disconnected.
When connecting the device to a power source, the relevant
norms, directives, regulations and technical standards must be
observed.
Connecting the pump
Make sure that the power supply data match the data on the
motor's type plate. The current consumption can be found on
the type plate.
Connect the motor cables. For electrical data see Chapter 4.
Note the proper polarity.
Fo
r DC motors:
red motor cable: +
black motor cable:
-
6.3. Hydraulic connection
Only connect components to the pump that are designed to
handle the hydraulic data of the pump (see Chapter 4,
Technical data).
Only use hoses that are suitable for the maximum permissible
operating pressure of the pump (see Chapter 4).
Only use hoses that are sufficiently chemically resistant to the
liquids being transferred.
6.3.1. Connecting the pump
Arrows on the pump head indicate the flow direction.
Remove the protective caps.
Connect the suction and pressure lines.
Keep the suction line as short as possible in order to keep the
priming process as brief as possible.
If the pump is used to build up pressure, make sure that all
transition joints between hose and pump are secure in order to
ensure that the hoses cannot come off.
Check that the hoses and transition joints (hose connect-
or/hose) are fitted correctly and securely.
Check that the system is leak-tight.
Connected
components
Hoses

Diaphragm liquid pump NF 25, NFB 25 Installation and connection
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 14
6.3.2. NFB 25 hose configuration
A double-headed pump is normally selected to reduce the
pressure surges caused by the alternation between suction
and exhaust in a diaphragm pump. In order to
achieve this
effect, in addition to the pump configuration it is important to
configure the hoses correctly.
For low pulsation (pressure surges) in NFB pumps:
Configure pump head hoses in parallel (see Fig. 8).
Keep hoses between pump and junction as short as possible.
Cause as little narrowing as possible with connection ele-
ments. Recommendation: Min. inside diameter 3mm.
Please contact your local KNF partner for further information
(www.knf.com).
Please contact your local KNF partner for further information
(www.knf.com).
Fig. 11: NFB hose configuration for low pulsation
Fig. 10: Hose connection options
for NFB versions
Fig. 12: No series connection in the
case of NFB versions
CAUTION
Series connection damages pump
If the two heads in the NFB versions are connected
in series, the pump will be damaged, and may leak.

Diaphragm liquid pump NF 25, NFB 25 Operation
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 15
7. Operation
Operate the pumps only under the operating parameters and
conditions described in Chapter 4, Technical data.
Make sure that the pumps are being used properly (see Chap-
ter 2.1).
Avoid improper use of the pumps (see Chapter 2.2).
Observe the safety precautions (see Chapter 3).
The pumps are components that are intended to be incorpo-
rated into another machine. Before putting them into service it
must be established that the machinery or systems in which
they are installed meet the relevant regulations.
CAUTION
Risk of burning
The drive heats up.

Avoid contact with the pump drive.

Avoid contact with flammable materials.
Excessive pressure and the inherent dangers thereof can be
prevented by placing a bypass line with a pressure relief valve
between the pressur
e and suction side of the pump. Please
contact your local KNF partner for further information
(www.knf.com).
If the pump stops running, restore the system to normal at-
mospheric pressure.
For pumps with thermal switch or electronic overload protection:
WARNING
Risk of physical injury and damage to the pump
due to automatic start
If the pump overheats and pump operation is
stopped by the thermal switch / electronics, the
pumps will restart automatically as soon as they have
had time to cool down.

Take steps to ensure that this cannot produce a
hazardous situation.
CAUTION
Risk of burns when transferring hot media

Do not touch the pump or the media transfer
system.

Avoid contact with flammable materials.
Pump standstill

Diaphragm liquid pump NF 25, NFB 25 Operation
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 16
Switching the pumps on and off
The motor speed of the pumps, and thus the flow rate, is adjusta-
ble and can also be regulated to some extent.
For more details, see Chapter 4, Technical data.
Duty cycle / short cycle operation
KNF pumps are designed for continuous operation.
Short start and stop cycles may adversely affect the service life of
the brushed motors.
If the pump is operated with short cycles in your application,
please contact your local KNF partner for further information
(www.knf.com.)
Switching on the pump
In order to ensure that the pump starts every time, make sure
that counterpressure is reduced to an acceptable level before
start-up. This should also be done during operation after a brief
power cut. Please contact your local KNF partner for further in-
formation (www.knf.com).
Switching off the pump
KNF recommends: If transferring aggressive liquids, the pump
should be flushed thoroughly prior to switch off (see Chapter
8.2.1), as this will help to lengthen the service life of the dia-
phragm.
Restore the system to normal atmospheric pressure (release
hydraulic pressure in pump).
Setting and regulating motor
speed
Short cycle operation
CAUTION
Overpressure on the suction side causes medi-
um to flow through the switched
-off pump
Take steps to ensure that this cannot produce a
hazardous situation.

Diaphragm liquid pump NF 25, NFB 25 Operation
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 17
Flow rate NF 25
Fig. 13: Flow rate of pump NF 25 DC-M
Fig. 14: Flow rate of pump NF 25 DCB and NF 25 DCB-4
Fig. 15: Flow rate of pump NF 25 DCB-4 depending on control voltage
0.00
0.05
0.10
0.15
0.20
0.25
0.30
-4.0 -2.0 0.0 2.0 4.0 6.0 8.0 10.0
Suction height [mWg] Pressure [mWg]
Flow rate [l/min]
0.00
0.05
0.10
0.15
0.20
0.25
0.30
-4.0 -2.0 0.0 2.0 4.0 6.0 8.0 10.0
Suction height [mWg] Pressure [mWg]
Flow rate [l/min]
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0 1 2 3 4 5
Control voltage Vctrl [V]
Flow rate [l/min]
0 mWg
10 mWg

Diaphragm liquid pump NF 25, NFB 25 Operation
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 18
Flow rate NFB 25
Fig. 16: Flow rate of pump NFB 25 DCB-B and NFB 25 DCB-4B (per
pump head)
Fig. 17: Flow rate of pump NFB 25 DCB-4B depending on control voltage
(per pump head)

Diaphragm liquid pump NF 25, NFB 25 Servicing
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 19
8. Servicing
8.1. Servicing schedule
Component
Servicing interval
Pump
-Regular inspection for external
damage or leaks
Pump head
-Clean if the flow rate decreases, the
pump does not work or no vacuum
is created (Chapter 8.2)
Diaphragm, valve
plates and seals
-Change as soon as pumping capac-
ity decreases, preferably sooner
Tab. 11
8.2. Cleaning and dismantling
WARNING
Health hazard due to dangerous
substances in the pump
Depending on the medium transferred, caustic burns
or poisoning are possible.

Wear protective clothing if necessary, e.g. pro-
tective gloves.

Flush the pump with a neutral liquid and pump
empty.

With NFB pumps, make sure that both pump
heads are flushed.
With NFB pumps the necessary steps are repeated for the
second pump head
.
8.2.1. Flushing the pump
If transferring aggressive media, KNF recommends flushing
the pump with a neutral fluid under atmospheric conditions for
a few minutes before switching off, to extend the service life of
valves and diaphragm.
8.2.2. Preparations for disassembly
Flush the pump with a suitable neutralising liquid, and make
sure that no dangerous substances are left in the pump.
Pump empty.
Separate electrical connections.
Disconnect hoses from pump head.
Qty
Tools
1
T6 Torx screwdriver
Tab. 12
Information on procedure
Tools

Diaphragm liquid pump NF 25, NFB 25 Servicing
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions 20
8.2.3. Disassembling the pump head
Loosen the four head screws (1) and remove the entire
head.
Remove the resonating diaphragm (3) from the connecting
plate (4).
Remove both anchor valves (6) from the intermediate plate
(7) and the connecting plate (4).
Remove the two anchor valve seals (5) from the connecting
plate (4).
Undo the diaphragm (8) by means of the head plate (2). Re-
move the washers and make sure that no washers (9) fall in-
to the pump housing.
We recommend replacing the diaphragm (8).
8.2.4. Clean or replace parts
Clean the anchor valves (6), the anchor valve seals (5) and
the diaphragm (8) with a cloth and then blow off with com-
pressed air or replace.
Blow off the intermediate plate (7), connecting plate (4) and
head plate (2) with compressed air.
8.2.5. Assembling the pump head
Screw diaphragm (8) with washer (9) into connecting rod.
Make sure that no washers (9) fall into the pump housing.
Use the head plate (2) to carefully tighten the diaphragm.
Insert the seals (5) in the connecting plate (4).
Insert the anchor valves (6) in the intermediate plate (7) and
the connecting plate (4).
Place the connecting plate (4) on top of the intermediate
plate (7).
A pin and hole system prevents incorrect assembly.
Insert the resonating diaphragm (3) into the connecting plate
(4).
Place the head plate (2) on top of the connecting plate (4). A
pin and hole system prevents incorrect assembly.
Insert the four head screws (1) into the through holes of the
pump head.
Place the pump head on top of the pump housing and make
sure that the flow direction of the pump head (see directional
arrow on the head plate (2)) is the same as before.
Alternately tighten the four head screws (1).
Reconnect the hoses to the pump head.
Fig. 18
1Head screws
2Head plate
3Resonating diaphragm
4Connecting plate
5Anchor valve seals
6Anchor valves
7Intermediate plate
8Diaphragm
9Washer