KNF NF 25 Series, NFB 25 Series, NFB 25 DCB-B, NF 25 DC-M, NFB 25 DCB-4B Operating And Installation Instructions

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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 with no

NF 25 KP DC-M 12V

DC-M / DCB / DCB-4 / DCB-B / DCB-4B

NF / NFB

Supply voltage [Ch. 4]

- / PMLxxxx / PLxxxx [Ch. 1]

KP / KT / TT [Ch. 4]

-specific designation,

technical relevance.

KNF Flodos AG Wassermatte 2 6210 Sursee, Switzerland

Tel +41 (0)41 925 00 25 Fax +41 (0)41 925 00 35

www.knf-flodos.ch info@knf-flodos.ch

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions Keep for future reference!

Contents Page

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

Diaphragm liquid pump NF 25, NFB 25 About this document

This symbol indicates a potential danger.

It also indicates the possible consequences of failure to observe the warning. The signal word (e.g. "Warning") indicates the level of danger.



Here you will see actions for avoiding the danger

Signal word

Meaning

Consequences if not observed

DANGER

warns of immedi-

Consequences are death or

WARNING

warns of potential

Death or serious injury and/or

CAUTION

warns of a potensituation

Minor injury or damage to prop-

This symbol indicates important information.

Project pumps

1. About this document

1.1. Use of the Operating and Installation Instructions

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

and potential consequences.

Danger levels

ate danger

danger

tially dangerous

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.

serious injury and/or serious property damage.

serious damage to property are possible.

erty are possible.

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 2

Diaphragm liquid pump NF 25, NFB 25 Use

Please contact your local KNF partner for special designs that are not included in the technical specification (www.knf.com).

Operating parameters and

Requirements for

The pumps must not be operated in an explosive atmosphere.

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

conditions

transferred medium

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 guaranteed, 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

DANGER

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 3

Diaphragm liquid pump NF 25, NFB 25 Safety

Observe the safety precautions in Chapters

6. Installation and connection and 7. Operation.

Personnel

Working in a

Handling dangerous media

Notes

Environmental protection

Disposal

3. Safety

safety-conscious manner

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 Operating 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 regulations 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 applicabl e envir onmental protection regulations. Observe the respective nat ional and int er nat io n al regul ations. 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.

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 4

Diaphragm liquid pump NF 25, NFB 25 Safety

EU directives/standards

Customer service and repairs

The pumps comply with the fundamental requirements of Directive 2011/65/EU (RoHS2).

The pumps comply with the safety requirements regarding electromagnetic compatibility in Directive 2004/ 1 08/ 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 com pleted m achinery is to be assembled 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.

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 5

Diaphragm liquid pump NF 25, NFB 25 Technical data

Assembly

Material1)

Pump head*

Valve plate / seals

EPDM

Diaphragm

EPDM

Resonating diaphragm

EPDM

Assembly

Material1)

Pump head*

Valve plate / seals

FFKM

Diaphragm

PTFE-coated

Resonating diaphragm

FFKM

Assembly

Material1)

Pump head*

PVDF

Valve plate / seals

FFKM

Diaphragm

PTFE-coated

Resonating diaphragm

FFKM

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]

Suction head [mWG]

Parameter

Value

Recommended hose size ID [mm]

4. Technical data

Pump materials The pump type KP stands for:

Tab. 2

according to DIN ISO 1629 and 1043.1

The pump type KT stands for:

Tab. 3

according to DIN ISO 1629 and 1043.1

The pump type TT stands for:

Tab. 4 * The pump head (Fig. 1) comprises a connecting plate and an intermedi-

ate plate.

according to DIN ISO 1629 and 1043.1

Hydraulic ratings

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 6

Tab. 5

Measured with water and using KNF standardised test equipement at

atmospheric pressure, KP pump head material

Flow rates may vary from the values shown, depending on fluid viscosity, ambient temperature, pump head material and the hoses / hose connectors used.

Hydraulic connections

Tab. 6

Diaphragm liquid pump NF 25, NFB 25 Technical data

Motor voltage

12V

24V

Power consumption [W]

2.9

Max. I load [A]

0.24

0.12

Max. permissible current Lead size [-]

AWG22

Protection class [-]

IP30

Weight

[g]

Motor option

DCB-4

DCB 12V

DCB 24V

Supply voltage [V]

10…26.4

Power consumption [W]

I load max. [A]

0.11…0.25

0.23

0.12

Lead size [-]

AWG28

Protection class

IP40

Weight

[g]

In the case of type NF25 DCB-4, the supply voltage is not designed for operation with pulse (PWM).

However, a PWM signal (frequency 1 control the control

Electrostatic sensitive components (ESD)

Specifications NF 25 DC-M

consumption [A]

Tab. 7

Specifications NF 25 DCB / DCB-4

2.9 2.8 2.9

Tab. 8

voltage.

0.31 0.14

-width modulated voltages

-20kHz) can be used to

1) The weight may differ slightly from the stated value, depending on the version

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 7

Diaphragm liquid pump NF 25, NFB 25 Technical data

Motor option

DCB-4B

DCB-B

Supply voltage [V]

Power consumption [W]

I load max. [A]

0.22…0.54

0.54

0.27

Protection class

Weight

[g]

210

In the case of type NFB25 DCB-4B, the supply voltage is not designed for operation with pulse (PWM).

However, a PWM signal (frequency 1 control the control voltage.

Electrostatic sensitive components (ESD)

Parameter

Value

Permissible ambient temperature range [C]

+ 5 to + 40

Permissible media temperature [C]

+ 5 to + 80

Permissible kinematic viscosity of medium

≤ 150

Specifications NFB 25 DCB-B / DCB-4B

10…26.4 12 24

5.4 6.5 6.5

IP50

Tab. 9

-width modulated voltages

-20kHz) can be used to

1) The weight may differ slightly from the stated value, depending on the version.

Other parameters

[cSt]

Tab. 10

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 8

Diaphragm liquid pump NF 25, NFB 25 Assembly and function

1 Outlet 2 3 4 5 6 7

1 Outlet valve 2 3 4 5 6 7

(double-headed pump)

5. Assembly and function

Assembly

Inlet Connecting plate Drive Connecting leads Head plate Intermediate plate

Inlet valve Working chamber Diaphragm Eccentric Connecting rod Pump drive

Fig. 3 : NFB 25

Fig. 1: Micro diaphragm liquid pump NF 25

Fig. 2: Pump assembly

The diaphragm liquid pumps are based on reciprocating displacement pump technology. 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 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).

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 9

Diaphragm liquid pump NF 25, NFB 25 Installation and connection

Mounting dimensions

6. Installation and connection

Only install the pump 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 ambient temperature.

 Mounting dimensions (see Fig. 4 to 6)

Fig. 4: Mounting dimensions NF 25 DC-M

Fig. 5: Mounting dimensions NF 25 DCB

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 10

Diaphragm liquid pump NF 25, NFB 25 Installation and connection

Installation location

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.

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 11

Diaphragm liquid pump NF 25, NFB 25 Installation and connection

Installation position

 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).

Fig. 9: Optimum installation

position for one-headed pumps:

horizontal

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 12

Diaphragm liquid pump NF 25, NFB 25 Installation and connection

Note the proper polarity. Fo

red motor cable: + black motor cable:

Arrows on the pump head indicate the flow direction.

Keep the suction line as short as possible in order to keep the priming process as brief as possible.

Connected

Hoses

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.

r DC motors:

6.3. Hydraulic connection

components

 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

Remove the protective caps. Connect the suction and pressure lines.

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.

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 13

Diaphragm liquid pump NF 25, NFB 25 Installation and connection

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 effect, in addition to the pump configuration it is important to configure the hoses correctly.

Please contact your local KNF partner for further information (www.knf.com).

Series connection damages pump

If the two heads in the NFB versions are connected in series, the pump will be damaged, and may leak.

Fig. 10: Hose connection options for NFB versions

6.3.2. NFB 25 hose configuration

achieve this

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.

Fig. 12: No series connection in the case of NFB versions

Fig. 11: NFB hose configuration for low pulsation

CAUTION

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 14

Diaphragm liquid pump NF 25, NFB 25 Operation

Risk of burning

The drive heats up.



Excessive pressure and the inherent dangers thereof can be prevented by placing a bypass line with a pressure relief valve between the pressur contact your local KNF partner for further information (www.knf.com).

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.



Risk of burns when transferring hot media



Pump standstill

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

Avoid contact with the pump drive. Avoid contact with flammable materials.

e and suction side of the pump. Please

Do not touch the pump or the media transfer

system.

CAUTION

 If the pump stops running, restore the system to normal at-

mospheric pressure.

For pumps with thermal switch or electronic overload protection:

WARNING

Avoid contact with flammable materials.

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 15

Take steps to ensure that this cannot produce a

hazardous situation.

Diaphragm liquid pump NF 25, NFB 25 Operation

If the pump is operated with short cycles in your application, please contact your local KNF partner for further information (www.knf.com.)

Setting and regulating motor

Short cycle operation

Overpressure on the suction side causes medium to flow through the switched

Switching the pumps on and off

The motor speed of the pumps, and thus the flow rate, is adjusta-

speed

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.

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 information (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 diaphragm.

 Restore the system to normal atmospheric pressure (release

hydraulic pressure in pump).

-off pump

 Take steps to ensure that this cannot produce a

CAUTION

hazardous situation.

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 16

Diaphragm liquid pump NF 25, NFB 25 Operation

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

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

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 17

Diaphragm liquid pump NF 25, NFB 25 Operation

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)

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 18

Diaphragm liquid pump NF 25, NFB 25 Servicing

Component

Servicing interval

Pump

- Regular inspection for external

Pump head

- Clean if the flow rate decreases, the Diaphragm, valve

- Change as soon as pumping capac-

Health hazard due to dangerous substances in the pump

Depending on the medium transferred, caustic burns or poisoning are possible.



With NFB pumps the necessary steps are repeated for the second pump head

Qty

Tools

T6 Torx screwdriver

Information on procedure

Tools

8. Servicing

8.1. Servicing schedule

damage or leaks

pump does not work or no vacuum is created (Chapter 8.2)

plates and seals

Tab. 11

ity decreases, preferabl y sooner

8.2. Cleaning and dismantling

WARNING

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.

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

Pump empty. Separate electrical connections. Disconnect hoses from pump head.

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 19

Tab. 12

sure that no dangerous substances are left in the pump.

Diaphragm liquid pump NF 25, NFB 25 Servicing

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 into 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 compressed air or replace.

Fig. 18

1 Head screws 2 Head plate 3 Resonating diaphragm 4 Connecting plate 5 Anchor valve seals 6 Anchor valves 7 Intermediate plate 8 Diaphragm 9 Washer

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.

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 20

Diaphragm liquid pump NF 25, NFB 25 Servicing

Escaping liquid

After assembly the pump may not be leak to incorrect assembly, damaged or soiled seal faces, or other reasons.



-tight due

CAUTION

Run pump for several minutes with a harmless

liquid at maximum operating pressure.

Check that pump is leak-tight.

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 21

Diaphragm liquid pump NF 25, NFB 25 Troubleshooting

Pump does not work

Possible cause

Remedy

Pump not connected to power

 Connect pump to power supply Power supply is not sw itched on

 Switch on power supply

Thermal switch or pump elec-

Disconnect pump from the mains

Connections or hoses are

 Check connections and hoses External valve is closed or filter is clogged

Check external valves and filters

Diaphragm, anchor valves or

 Replace diaphragm, anchor valves and seals

Pump is not priming

Possible cause

Remedy

Suction side of pump not con-

Connect the suction side of the pump

Liquid in the container is too low

Fill container

Hose connections are not leak-

Secure transition joints between hose and connections with

Peripheral valve is closed or

 Open the peripheral valve

Pump head is filled with gas.

Reduce pressure at pressure side

Particles in the pump

Clean the pump head (see Chapter 8.2)

The pump parts are not re-

Replace the pump head with a compatible version

Incorrect interchange of pres-

 Remove pressure and suction lines and reconnect correctly

9. Troubleshooting

 Disconnect the pump from the power supply before working on

the pump.

 Make sure that the pump is de-energised.

supply



tronics have tripped

 Allow pump to cool  Identify and eliminate cause of overheating/overload

blocked

seals are worn.

nected

tight

filter is clogged

The system is unable to handle the pressure on the pressure side

 Remove blockage



(see Chapter 8.3)

Tab. 13



clamps or other clamping elements

 Clean filter



sistant to the medium to be transferred

sure and suction line connections

Tab. 14

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 22

Diaphragm liquid pump NF 25, NFB 25 Troubleshooting

Flow rate, suction head or pressure head is too low

Possible cause

Remedy

Components in the system

 Modify installation, check the cross-sections of components

Hose connections are not leak-

Secure tra nsit ion joints between hose and hose connections

Particles in the pump

 Clean the pump head, install suction-side filter if required Viscosity of the transferred

Contact KNF

Incorrect interchange of pres-

Remove pressure and suction lines and reconnect correctly

The pump parts are not re-

 Replace the pump head with a compatible version

The pump does not achieve the performance stated in the technical data or on the data sheet.

connected to the suction and pressure sides, such as hoses, valves or filters, are causing too much resistance



tight

with clamps or clamping elements

(see Chapter 8.2)



medium is too high



sure and suction line connections

sistant to the medium to be transferred

Tab. 10

Fault cannot be rectified

If you are unable to identify any of the above causes, please send the pump to KNF customer service (see address on last page).

Flush the pump to clear the pump head of any hazardous or

aggressive liquids (see Chapter 8.2.1). Dismantle the pump. Clean the pump (see Chapter 8.2.2). Send the pump, with completed decontamination declaration

(see Chapter 10), to KNF customer service stating the nature

of the transferred medium.

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 23

Diaphragm liquid pump NF 25, NFB 25 Accessories

for hose

Please contact your local KNF partner for further information (www.knf.com).

10. Accessories

The following filters are available:

Type Material Mesh size

FS 60 T PVDF 70 µm 600 ml/ min UNF 1/4“- 28 165210

FS 60 X PEEK 35 µm 600 ml/ min UNF 1/4“- 28 165212

FS 25 T PVDF 70 µm 250 ml/ min

FS 25 X PEEK 35 µm 250 ml/ min

Max. flow volume (liquid)

Tab. 16

Connections Order No.

ID 3.2 / 4 mm

165211

165213

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 24

Diaphragm liquid pump NF 25, NFB 25 Decontamination declaration

KNF shall only undertake to repair the pump on condition that the customer provides certification of the transferred media and the cleaning of the pump (decontamination declarati

11. Decontamination declaration

on).

 In order to send a product back use the decontamination

declaration, which either was delivered with the product or is

available on www.knf.com (Downloads).

Please fill in the pump type, serial number, pumped media and all other required information. Send the signed form together with the product to your KNF representative.

KNF Flodos AG BA_NF25_NFB25_EN_07_159615 Translated from the Original Operating and Installation Instructions 25

Diaphragm liquid pump NF 25, NFB 25 For your notes

KNF Flodos AG BA_NF25_NFB25_EN_07_159615

Translated from the Original Operating and Installation Instructions 26

KNF worldwide

Please find your local KNF partners at: www.knf.com

KNF NF 25 Series, NFB 25 Series, NFB 25 DCB-B, NF 25 DC-M, NFB 25 DCB-4B Operating And Installation Instructions

Specifications and Main Features

Frequently Asked Questions

User Manual

1. About this document

1.2. Symbols and markings

2. Use

2.1. Intended use

2.2. Improper use

3. Safety

4. Technical data

5. Assembly and function

6. Installation and connection

6.1. Installation

6.2. Electrical connection

6.3. Hydraulic connection

6.3.1. Connecting the pump

6.3.2. NFB 25 hose configuration

7. Operation

8. Servicing

8.1. Servicing schedule

8.2. Cleaning and dismantling

8.2.1. Flushing the pump

8.2.2. Preparations for disassembly

8.2.3. Disassembling the pump head

8.2.4. Clean or replace parts

8.2.5. Assembling the pump head

9. Troubleshooting

10. Accessories

11. Decontamination declaration