Diaphragm Gas Sampling Pumps Operating and Installation Instructions N 026 FT.16 E Read and observe these Operating and Installation Instructions! N 726 FTE N 726 FT.29 E KNF Neuberger GmbH Alter Weg 3 D-79112 Freiburg Germany Tel. +49-(0)7664-5909-0 Fax +49-(0)7664-5909-99 E-mail: info@knf.de www.knf.de Contents Page 1. About this document... 2 2. Use... 3 3. Safety... 4 4. Technical data... 6 5. Design and function... 8 6. Installation and connection... 10 7. Operation... 14 8. Servicing... 17 9. Troubleshooting... 30 10. Spare parts and accessories... 32 11. Returns... 33 12. Health and safety clearance and decontamination form... 34 KNF 121592-121595 07/16 Translation of original Operating and Installation Instructions, english Keep for future use!
About this document Diaphragm Pumps N 026 FT.16 E and N 726 FTE 1. About this document Project pumps 1.1. Using the Operating and Installation Instructions The Operating and Installation Instructions are part of the pump. Pass on the Operating and Installation Instructions to the next owner. Customer-specific project pumps (pump models which begin with "PJ" or "PM") may differ from the Operating and Installation Instructions. For project pumps, also observe the agreed upon specifications. 1.2. Symbols and markings Warning A danger warning is located here. WARNING Possible consequences of a failure to observe the warning are specified here. The signal word, e.g. Warning, indicates the danger level. Measures for avoiding the danger and its consequences are specified here. Danger levels Signal word Meaning DANGER warns of immediate danger WARNING CAUTION warns of possible danger warns of a possibly dangerous situation Consequences if not observed Death or serious injuries and/or serious damage are the consequence. Death or serious injuries and/or serious damage are possible. Minor injuries or damage are possible. Tab. 1 Other information and symbols An activity to be carried out (one step) is specified here. 1. The first step of an activity to be carried out is specified here. Additional, consecutively numbered steps follow. This symbol refers to important information. 2 Translation of original Operating and Installation Instructions, english, KNF 121592-121595 07/16
Diaphragm Pumps N 026 FT.16 E and N 726 FTE Use 2. Use Operating parameters and conditions Requirements for transferred medium 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 and conditions described in Chapter 4, Technical data. Only complete pumps may be taken into service. 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 the compatibility of the materials of the pump head, diaphragm and valves with the medium. Before using a medium, check whether the medium can be transferred danger-free in the specific application case. Only transfer gases which remain stable under the pressures and temperatures occurring in the pump. 2.2. Improper use The pumps 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. Pumps with three-phase motor are not provided for the operation with frequency converter. Translation of original Operating Instructions, English, KNF 121592-121595 07/16 3
Safety Diaphragm Pumps N 026 FT.16 E and N 726 FTE 3. Safety Note the safety precautions in sections 6. Installation and connection, and 7. Operation. Personnel Working in a safetyconscious manner Handling dangerous media Handling combustible media Environmental protection EC Directives / Standards 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 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 maintenance work. Make sure that the personnel has read and understood the Operating and Installation Instructions, and in particular the "Safety" chapter. Observe the accident prevention and safety regulations when performing any work on the pumps and during operation. The pump heads heat up during operation avoid contact with them. When transferring dangerous media, observe the safety regulations 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 (compressor operation). 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 (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. 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 4 Translation of original Operating and Installation Instructions, english, KNF 121592-121595 07/16
Diaphragm Pumps N 026 FT.16 E and N 726 FTE Safety Customer service and repairs assembled is in conformity with the provisions of the Machinery Directive 2006/42/EC. The following essential requirements of Annex I of Directive 2006/42/EC (general principles) are applied and observed: - General Principles No. 1 - No. 1.1.2. / 1.1.3. / 1.3.1. / 1.3.3. / 1.3.4. / 1.4.1. / 1.5.1. / 1.5.2. / 1.5.8. / 1.5.9. / 1.7.4. / 1.7.4.1. / 1.7.4.3. As these partly completed machinery are OEM-models the power supplies and the equipment for disconnecting and switching-off the partly completed machinery respectively have to be considered when mounting as well as over-current and overload protective gear. In addition a protection against mechanical parts in motion and hot parts, if existing, has to be provided when mounting. The pumps conform to the Directive 2011/65/EU (RoHS2). The following harmonized standards have been used: DIN EN 50581 DIN EN 55014-1/2 DIN EN 61000-3-2/3 DIN EN 60204-1 Only have repairs to the pumps carried out by the KNF Customer Service responsible. Use only genuine parts from KNF for servicing work. Translation of original Operating Instructions, English, KNF 121592-121595 07/16 5
Technical data Diaphragm Pumps N 026 FT.16 E and N 726 FTE 4. Technical data Pump materials N 026 FT.16 E Assembly Pump head Diaphragm Retaining plate Valve Material PTFE PTFE Stainless steel PTFE Tab. 2 N 726 FTE N 726 FT.29 E Assembly Pump head Diaphragm Valve Material PTFE PTFE-coated PTFE Tab. 3 Pneumatic values N 026 FT.16 E Parameter Value Max. permissible operating pressure [bar g] 1.5 Ultimate vacuum [mbar abs.] 240 Delivery rate at atm. pressure [l/min]* 15 Tab. 4 * Litres in standard state (1013 mbar) N 726 FTE Parameter Value Max. permissible operating pressure [bar g] 1.5 Ultimate vacuum [mbar abs.] 53 Delivery rate at atm. pressure [l/min]* 16 Tab. 5 * Litres in standard state (1013 mbar) N 726 FT.29 E Parameter Value Max. permissible operating pressure [bar g] up to 1.5 Ultimate vacuum [mbar abs.] down to 125 Delivery rate at atm. pressure [l/min]* 6.7-16 Tab. 6 * Litres in standard state (1013 mbar) 6 Translation of original Operating and Installation Instructions, english, KNF 121592-121595 07/16
Diaphragm Pumps N 026 FT.16 E and N 726 FTE Technical data Electrical Data Parameter Value IP 44 AC Value IP 44 3-phase Voltage (V) 230 230/400 Frequency (Hz) 50 50 Power P 1 (W) 130 (N 726) 120 (N 026) 120 Operating current (A) 1.0 0.8/0.45 (N 726) Tab. 7 Thermal-switch The pumps with capacitor motor are fitted as standard with a thermal-switch to protect against overloading. Other parameters Parameter Value Permissible + 5 C to + 40 C ambient temperature Permissible media temperature + 5 C to + 40 C Electrical data See drive-motor type plate Gas tightness* of pump head < 6 x 10-3 mbar l/s Tab. 8 * After opening the pump head, or replacing the diaphragm and valve plates or reed valves the gas tightness is no longer guaranteed. A leak test is able to verify that the original standard of gastightness has been achieved. Variants -.16 designs have temperature-resistant pump heads for media with temperatures of up to 200 C. -.29-versions: adjustable flow rate through integral bypassvalve. Translation of original Operating Instructions, English, KNF 121592-121595 07/16 7
Design and function Diaphragm Pumps N 026 FT.16 E and N 726 FTE 5. Design and function Design 1 Pneumatic outlet 2 Pneumatic inlet 3 Pump head 4 Motor 5 Terminal box Fig. 1: Diaphragm pump N 026 FT.16 E 1 Pneumatic outlet 2 Pneumatic inlet 3 Pump head 4 Capacitor 5 Motor 6 Terminal box Fig. 2: Diaphragm pump N 726 FTE 8 Translation of original Operating and Installation Instructions, english, KNF 121592-121595 07/16
Diaphragm Pumps N 026 FT.16 E and N 726 FTE Design and function 1 Pneumatic outlet 2 Pneumatic inlet 3 Pump head 4 Capacitor 5 Motor 6 Terminal box 7 Adjusting screw for flow (see section 7.2) Fig. 3: Diaphragm pump N 726 FT.29 E Function 1 Outlet valve 2 Inlet valve 3 Transfer chamber 4 Diaphragm 5 Eccentric 6 Connecting rod 7 Pump drive Fig. 4: Pump head The pumps transfer, compress 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. The pumps can be used as vacuum pump or compressor. However, pressure and vacuum cannot be generated simultaneously. Translation of original Operating Instructions, English, KNF 121592-121595 07/16 9
Installation and connection Diaphragm Pumps N 026 FT.16 E and N 726 FTE 6. Installation and connection Only install and operate the pumps under the operating parameters and conditions described in Chapter 4, Technical data. Observe the safety precautions (see Chapter 3). Mounting dimensions 6.1. Installation Before installation, store the pump at the installation location to bring it up to room temperature. See Fig. 5 (N 026 FT.16 E), Fig. 6 (N 726 FTE) or Fig. 7 (N 726 FT.29 E) for the mounting dimensions. Fig. 5: Mountings N 026 FT.16 E with capacitor motor (All dimensional tolerances conform to DIN ISO 2768-1, Tolerance Class V) Fig. 6: Mountings N 726 FTE with capacitor motor (All dimensional tolerances conform to DIN ISO 2768-1, Tolerance Class V) 10 Translation of original Operating and Installation Instructions, english, KNF 121592-121595 07/16
Diaphragm Pumps N 026 FT.16 E and N 726 FTE Installation and connection Cooling air supply Installation location Fig. 7: Mountings N 726 FT.29 E with capacitor motor (All dimensional tolerances conform to DIN ISO 2768-1, Tolerance Class V) 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. Install the pump at the highest point in the system to prevent condensate from collecting in the pump head. Protect the pump from dust. Protect the pump from vibrations and jolts. Pump N 026 FT.16 E: ATTENTION Danger of injury and damage of pump. The pumps offer no protection against contact or foreign bodies. Provide protection for persons against contact with moving parts (e.g. connecting rod). Protection against the entry of foreign bodies must also be provided. Translation of original Operating Instructions, English, KNF 121592-121595 07/16 11
Installation and connection Diaphragm Pumps N 026 FT.16 E and N 726 FTE 6.2. Electrical connection DANGER Extreme danger from electrical shock! Only have the pump connected by an authorized specialist. Only have the pump connected when the power supply is disconnected. Connecting pump 1. Compare the supply data with the data on the motor-plate. For operating current see type plate. The voltage must not vary by more than + 10% and - 10% from that shown on the type-plate. 2. Open terminal box cover (see fig. 1, position 5; fig. 2 or 3, position 6). 3. All pumps except versions with 3 phase motor: Connect the mains cables to the connections L1 and N of the pump motor. 4. Connection of pumps with 3 phase motor according to figs. 8 or 9. 5. Connect the earth (ground) wire to the motor. 6. Close the terminal cover box. Mains Fig. 8: Y-Connection (high voltage) Mains Fig. 9: -Connection (low voltage) 12 Translation of original Operating and Installation Instructions, english, KNF 121592-121595 07/16
Diaphragm Pumps N 026 FT.16 E and N 726 FTE Installation and connection Connected components Pump exhaust 6.3. Pneumatic connection Only connect components to the pump which are designed for the pneumatic data of the pump (see Chapter 4, Technical data). If the pump is used as a vacuum pump, safely discharge the pump exhaust. Connecting pump A marking on the pump head shows the direction of flow. 1. Remove the protective plugs from the hose connection threads. 2. Connect the suction line and pressure line (for thread size and flow direction see Figs. 5, 6 and 7). 3. Lay the suction and pressure line at a downward angle to prevent condensate from running into the pump. Translation of original Operating Instructions, English, KNF 121592-121595 07/16 13
Operation Diaphragm Pumps N 026 FT.16 E and N 726 FTE 7. Operation Only operate the pumps under the operating parameters and conditions described in Chapter 4, Technical data. Make sure the pumps are used properly (see section 2.1). Make sure the pumps are not used improperly (see section 2.2). Observe the safety precautions (see Chapter 3). Hazard of the pump head bursting due to excessive pressure and temperature increase WARNING Do not exceed max. permissible operating pressure (see Chapter 4, Technical data). Monitor pressure during operation. If the pressure exceeds the maximum permissible operating pressure, immediately switch off pump and eliminate fault (see Chapter 9. Troubleshooting). Only throttle or regulate the air or gas quantity in 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 is not exceeded. Excessive pressure (with all of the related hazards) can be prevented by placing a bypass line with a pressure-relief valve between the pressure and suctions sides of the pump. For further information, contact our technical adviser (see front page for telephone number). The pump may not start up against pressure or vacuum during switch-on. This also applies in operation following a brief power failure. Pump standstill Make sure that normal atmospheric pressure is present in the lines during switch-on. With the pump at a standstill, open pressure and suction lines to normal atmospheric pressure. 14 Translation of original Operating and Installation Instructions, english, KNF 121592-121595 07/16
Diaphragm Pumps N 026 FT.16 E and N 726 FTE Operation For pumps with thermal switch: Automatic starting can cause personal injury and pump damage WARNING When the operation of the pump is interrupted by the thermal switch, the pump will restart automatically after cooling down. Take all necessary care to prevent this leading to a dangerous situation. Hot media Pump N 026 FT.16 E: CAUTION Danger of burning yourself when using hot media Do not touch the supply and return lines of the pumps and pump head. 7.1. Switching pump on and off Switching pump on The pump may not start up against pressure or vacuum during switch-on. This also applies in operation following a brief power failure. Make sure that normal atmospheric pressure is present in the lines during switch-on. Switching pump off KNF recommends: When transferring aggressive media, flush the pump prior to switch-off (see Section 8.2.1) to increase the service life of the diaphragm. Open pressure and suction lines to normal atmospheric pressure. 7.2. Setting the flow (N 726 FT.29 E) This diaphragm pump is designed so that the flow rate can be adjusted to suit the analysis system it is supplying. If it is necessary to adjust the flow, proceed as follows (Fig. 10): 1. Loosen the knurled nut Y. 2. To reduce the flow: Turn the adjusting screw X anti-clockwise. To increase the flow: Turn the adjusting screw X clockwise. When the valve is closed the resistance to turning increases noticeably to avoid damage do not turn beyond this point. 3. Re-tighten the knurled nut Y. Translation of original Operating Instructions, English, KNF 121592-121595 07/16 15
Operation Diaphragm Pumps N 026 FT.16 E and N 726 FTE X Y Adjusting screw Knurled nut Fig. 10: Setting the flow (N 726 FT.29 E) 16 Translation of original Operating and Installation Instructions, english, KNF 121592-121595 07/16
Diaphragm Pumps N 026 FT.16 E and N 726 FTE Servicing 8. Servicing 8.1. Servicing schedule Component Pump Molded diaphragm and valve plates (pump range N 726) or wave diaphragm and valve plates (N 026 FT.16 E) Servcing interval Regular inspection for external damage or leaks Replace at the latest, when pump output decreases Tab. 9 8.2. Cleaning When cleaning, make sure that no liquids enter the inside of the housing. 8.2.1. Flushing pump When transferring aggressive media, flush the pump under atmospheric conditions some minutes with air (or, if necessary for safety reasons, with an inert gas) prior to switch-off to increase the service life of the diaphragm. 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 121592-121595 07/16 17
Servicing Diaphragm Pumps N 026 FT.16 E and N 726 FTE 8.3. Replacing wave diaphragm and valve plates 8.3.1. N 026 FT.16 E Pump is switched off and mains plug is removed from the socket Pump is clean and free of hazardous materials Spare parts Spare part* Position** Quantity Wave diaphragm (R) 1 (threefold) Valve plate (T) 2 O-ring (X) 2 Sleeve (Y) 2 Tab. 10 * According to Spare parts list, chapter 10 ** According to Fig. 11 Tools Quantity Tools/Material 1 Allen key 4 mm 1 Screwdriver blade width 5.5 mm 1 Fork wrench 13 mm 1 Fork wrench 14 mm 1 Socket wrench 27 mm 1 Felt-tip pen 1 Peg spanner, diameter 4, or KNF wrench for retainer plate (see section 10) Tab. 11 Information on procedure Always replace the wave diaphragm, valve plates, sleeves and O-rings together to maintain the pump performance. WARNING Health hazard due to dangerous substances in the pump! Depending on the substance transferred, caustic burns or poisoning are possible. Wear protective clothing if necessary, e.g. protective gloves. Flush pump before replacing the diaphragm and valve plates (see section 8.2.1). Procedure The position letters in the following text refer to fig. 11. Preparatory steps 1. Remove the 6 allen screws A and take off both clamp rings B. 2. Remove the 4 allen screws E, keeping disk springs W on carrier F. 3. Take off pressure plate G, sleeve H and head K mark the fitting position before removing. 4. Remove the 4 cheese head screws N and cover plate P. 18 Translation of original Operating and Installation Instructions, english, KNF 121592-121595 07/16
Diaphragm Pumps N 026 FT.16 E and N 726 FTE Servicing Replacing valve plates 1. Loosen valve body C with a socket wrench and remove it. 2. Take sleeve Y out of the hole of head K and put one new sleeve into it. For the position of sleeve see detailed view in Fig. 11. 3. Fit a new O-ring X to valve body C (pressure side). 4. Take out valve plate T from head K and replace valve plate T with a new one. The six projections of valve plate T must face upwards. 5. Screw in valve body C moderately. 6. Loosen valve body D with a socket wrench and remove it. 7. Take sleeve Y out of the hole of head K and put one new sleeve into it. For the position of sleeve see detailed view in Fig. 11. 8. Replace O-ring X in valve body D (inlet side) by a new one. 9. Take out valve plate T from head K and replace valve plate T with a new one. The six projections of valve plate T must face downwards. 10. Screw in valve body D moderately. Change wave diaphragm 1. Undo the retaining plate L with a Ø 4 peg spanner or a KNF wrench for retainer plate holding the conrod extension M with an open-end spanner to prevent it turning. 2. The diaphragm R has 3 layers and is replaced completely. Place retaining plate L upside down and fit new diaphragm R, diaphragm support S (as shown in fig. 11) and insulation washer U. 3. Replace the assembly of step 2, screwing it into con-rod extension M by hand. 4. Turn the counterweight V until the con-rod extension is in midstroke. 5. Replace the diaphragm assembly R, aligning the holes for screws E. Tighten retaining plate L with the peg spanner on con-rod extension M, holding con-rod extension M. Final steps 1. Replace the head K, sleeve H and pressure plate G, aligning the marks made previously. 2. Fit the 4 allen screws E, through the head assembly, into carriers F, with disk springs W as shown in fig. 11. Flatten disk springs fully, then undo 1 ¼ turns. 3. Turn counterweight V to ensure pump runs freely. 4. Fit clamp ring B with allen screws A and tighten securely. Translation of original Operating Instructions, English, KNF 121592-121595 07/16 19
Servicing Diaphragm Pumps N 026 FT.16 E and N 726 FTE 5. Replace cover plate P. 6. Check and ensure the gas-tightness of the pump head and the tubing. Specification A B C,D E F G H K L M N P R S T U V W X Y Socket screw Clamp ring Valve body Socket screw Carrier Pressure plate Sleeve Head Retaining plate Con-rod extension Cheese head screw Cover plate Diaphragm Diaphragm support Valve plate Insulation washer Counterweight Disk spring O-ring Sleeve Inlet valve: Pressure valve: Fig. 11: Pump parts N 026 FT.16 E 20 Translation of original Operating and Installation Instructions, english, KNF 121592-121595 07/16
Diaphragm Pumps N 026 FT.16 E and N 726 FTE Servicing Conditions Spare parts 8.3.2. N 726 FTE Motor disconnected from mains and de-energized Pump free of dangerous substances Spare part* Position** Quantity Molded Diaphragm (K) 1 Valve plate (T) 2 Sleeve (U) 2 O-ring (S) 2 Tab. 12 * According to Spare parts list, chapter 10 ** According to Fig. 12. Tools and material Quantity Tools/Material 1 Allen key 4 mm 1 Screwdriver blade width 5.5 mm 1 Socket wrench 27 mm 1 Felt-tip pen Tab. 13 Information on procedure Always replace the molded diaphragm, valve plates, sleeves and O-rings together to maintain the pump performance. WARNING Health hazard due to dangerous substances in the pump! Depending on the substance transferred, caustic burns or poisoning are possible. Wear protective clothing if necessary, e.g. protective gloves. Clean pump with suitable measures. Procedure The position letters in the following text refer to fig. 12. Preparatory steps 1. Mark the position of housing A, the head B and pressure plate C relative to each other by drawing a line with felt-tip pen to ensure proper assembly. 2. Mark the position of valve body F, clamp ring E and the pressure plate C relative to each other by a drawing line. Afterwards mark the position of valve body G. 3. Unscrew the four cheese head screws M and remove the cover N. 4. Unscrew the six allen screws D and the four allen screws H, and remove the complete pump head from housing A. Translation of original Operating Instructions, English, KNF 121592-121595 07/16 21
Servicing Diaphragm Pumps N 026 FT.16 E and N 726 FTE Replacing valve plates 1. Loosen valve body F with a socket wrench and remove it. 2. Take sleeve U out of the hole of head B and put one new sleeve into it. For the position of sleeve see detailed view in Fig. 12. 3. Fit a new O-ring S to valve body F (pressure side). 4. Take out valve plate T from head K and replace valve plate T with a new one. The six projections of valve plate T must face upwards. 5. Screw in valve body F moderately. 6. Loosen valve body G with a socket wrench and remove it. 7. Take sleeve U out of the hole of head B and put one new sleeve into it. For the position of sleeve see detailed view in Fig. 12. 8. Replace O-ring S in valve body G (inlet side) by a new one. 9. Take out valve plate T from head B and replace valve plate T with a new one. The six projections of valve plate T must face downwards. 10. Screw in valve body G moderately. 11. Lay the clamp rings E on head B; tighten the three allen screws D only very moderately (they will be tightened firmly in a later step). Change molded diaphragm 1. Unscrew the molded diaphragm K from the inside thread of connecting rod L by turning it anticlockwise by hand. If there are spacers on the thread of the molded diaphragm, remove them and put them on the thread of the new molded diaphragm. 2. Screw the new molded diaphragm K into the connecting rod L and tighten firmly by hand. If the molded diaphragm is overstretched the PTFE-coating can come off. Final steps 1. Turn the balance weight P until connecting rod L is in midposition. Seat the bead of molded diaphragm K correctly in the groove in housing A. 2. Position the pump head on the housing A according to the felttip pen marking. 3. Fit the 4 allen screws H and tighten them uniformly diagonally until the disk springs R are flattened. To prevent parts from warping, start by tightening each of the screws half a turn alternately. 22 Translation of original Operating and Installation Instructions, english, KNF 121592-121595 07/16
Diaphragm Pumps N 026 FT.16 E and N 726 FTE Servicing 4. At the valve bodies F and G tighten each three allen screws D carefully until resistance is noticeable. 5. Check the smooth movement of the pump by turning the balance weight P. 6. Mount cover N with the four cheese head screws M. 7. Check and ensure the gas-tightness of the pump head and the tubing. Translation of original Operating Instructions, English, KNF 121592-121595 07/16 23
Servicing Diaphragm Pumps N 026 FT.16 E and N 726 FTE Suction side Specifications A Housing B Head C Pressure plate D Allen screw E Clamp ring F Valve body G Valve body H Allen screw K Molded diaphragm L Connecting rod M Cheese head screw N Cover P Balance weight R Disk spring S O-ring T Valve plate U Sleeve U U U Pressure side Fig. 12: Pump parts N 726 FTE 24 Translation of original Operating and Installation Instructions, english, KNF 121592-121595 07/16
Diaphragm Pumps N 026 FT.16 E and N 726 FTE Servicing 8.3.3. N 726 FT.29 E Conditions Spare parts Motor disconnected from mains and de-energized Pump free of dangerous substances Spare part* Position** Quantity Molded Diaphragm (K) 1 Valve plate (T) 2 Sleeve (U) 2 O-ring (S) 2 Tab. 14 * According to Spare parts list, chapter 10 ** According to Fig. 13. Tools and material Quantity Tools/Material 1 Allen key 4 mm 1 Screwdriver blade width 5.5 mm 1 Socket wrench 27 mm 1 Felt-tip pen Tab. 15 Information on procedure Always replace the molded diaphragm, valve plates, sleeves and O-rings together to maintain the pump performance. WARNING Health hazard due to dangerous substances in the pump! Depending on the substance transferred, caustic burns or poisoning are possible. Wear protective clothing if necessary, e.g. protective gloves. Clean pump with suitable measures. Procedure The position letters in the following text refer to fig. 13. Preparatory steps 1. Mark the position of housing A, the head B and pressure plate C relative to each other by drawing a line with felt-tip pen to ensure proper assembly. 2. Mark the position of valve body F, clamp ring E and the pressure plate C relative to each other by a drawing line. Afterwards mark the position of valve body G. 3. Unscrew the four cheese head screws M and remove the cover N. 4. Unscrew the six allen screws D and the four allen screws H, and remove the complete pump head from housing A. Replacing valve bodies and valve plates 1. Loosen valve body F with a socket wrench and remove it. 2. Take sleeve U out of the hole of head B and put one new Translation of original Operating Instructions, English, KNF 121592-121595 07/16 25
Servicing Diaphragm Pumps N 026 FT.16 E and N 726 FTE sleeve into it. For the position of sleeve see detailed view in Fig. 12. 3. Fit a new O-ring S to valve body F (pressure side). 4. Take out valve plate T from head K and replace valve plate T with a new one. The six projections of valve plate T must face upwards. 5. Screw in valve body F moderately. The valve bodies F and G differ from each other by the bore dimension (see detailed view in Fig. 13): Pressure side of the pump: Smaller diameter Suction side of the pump: Larger diameter 6. Loosen valve body G with a socket wrench and remove it. 7. Take sleeve U out of the hole of head B and put one new sleeve into it. For the position of sleeve see detailed view in Fig. 12. 8. Replace O-ring S in valve body G (inlet side) by a new one. 9. Take out valve plate T from head B and replace valve plate T with a new one. The six projections of valve plate T must face downwards. 10. Screw in valve body G moderately. The valve bodies F and G differ from each other by the bore dimension (see detailed view in Fig. 13): Pressure side of the pump: Smaller diameter Suction side of the pump: Larger diameter 11. Lay the clamp rings E on head B; tighten the three allen screws D only very moderately (they will be tightened firmly in a later step). Change molded diaphragm 1. Unscrew the molded diaphragm K from the inside thread of connecting rod L by turning it anticlockwise by hand. Remove shims J from the thread of the molded diaphragm and put them on the thread of the new molded diaphragm. 2. Screw the new molded diaphragm K into the connecting rod L and tighten firmly by hand. If the molded diaphragm is overstretched the PTFE-coating can come off. Final steps 1. Turn the balance weight P until connecting rod L is in midposition. Seat the bead of molded diaphragm K correctly in the groove in housing A. 2. Position the pump head on the housing A according to the felttip pen marking. 26 Translation of original Operating and Installation Instructions, english, KNF 121592-121595 07/16
Diaphragm Pumps N 026 FT.16 E and N 726 FTE Servicing 3. Fit the four allen screws H and tighten them uniformly diagonally until the disk springs R are flattened. To prevent parts from warping, start by tightening each of the screws half a turn alternately. 4. At the valve bodies F and G tighten each three allen screws D carefully until resistance is noticeable. 5. Check the smooth movement of the pump by turning the balance weight P. 6. Mount cover N with the four cheese head screws M. 7. Check and ensure the gas-tightness of the pump head and the tubing. Translation of original Operating Instructions, English, KNF 121592-121595 07/16 27
Servicing Diaphragm Pumps N 026 FT.16 E and N 726 FTE Pump head shown turned through 90 Valve, suction side Valve, pressure side Throttle valve (complete) Specifiactions A Housing B Head C Pressure plate D Allen screw E Clamp ring F Valve body G Valve body H Allen screw J Shim K Molded diaphragm L Connecting rod M Cheese head screw N Cover P Balance weight R Disk spring S O-ring T Valve plate U Sleeve V X Y Z Valve body Adjusting screw Knurled nut Throttle valve Fig. 13: Pump parts N 726 FT.29 E 28 Translation of original Operating and Installation Instructions, english, KNF 121592-121595 07/16
Diaphragm Pumps N 026 FT.16 E and N 726 FTE Servicing 8.3.4. Changing the throttle valve (N 729 FT.29 E) The position letters in the following text refer to fig. 13 on previous page. 1. Remove the throttle valve Z from the head B by unscrewing the valve body V (spanner size 22 mm). 2. Fit a complete new replacement valve Z and tighten it gently. The throttle valve Z is precisely pre-adjusted in our works, do not loosen the knurled nut Y before the valve Z has been fitted to the head B. 3. Re-adjust the flow rate as described in "Setting the flow", section 7. Translation of original Operating Instructions, English, KNF 121592-121595 07/16 29
Troubleshooting Diaphragm Pumps N 026 FT.16 E and N 726 FTE 9. Troubleshooting DANGER Extreme danger from electrical shock! Disconnect the pump power supply before working on the pump. Make sure the pump is de-energized and secure. Pump does not transfer Cause No voltage in power source. Connections or lines blocked. External valve is closed or filter is clogged. Condensate has collected in pump head. Diaphragm or valve plates are worn. Check the pump (see Tab. 16 and 17). Fault remedy Check room fuse and switch on if necessary. Check connections and lines. Remove blockage. Check external valves and filters. Flush pump (see Section 8.2.1). Install pump at highest point in system. Replace diaphragm and valve plates (see Section 8.3). Tab. 16 Flow rate, pressure or vacuum too low The pump does not achieve the output specified in the Technical data or the data sheet. Cause Fault remedy Condensate has collected in Flush pump (see Section 8.2.1). pump head. Install pump at highest point in system. There is gauge pressure on Change the pressure conditions. pressure side and at the same time vacuum or a pressure above atmospheric pressure on suction side. Pneumatic lines or connection parts have an insufficient cross section or are throttled. Leaks occur on connections, lines or pump head. Connections or lines completely or partially jammed. Head parts are soiled. Diaphragm or valve plates are worn. Disconnect pump from system to determine output values. Eliminate throttling (e.g. valve) if necessary. Use lines or connection parts with larger cross section if necessary. Eliminate leaks. Check connections and lines. Remove the jamming parts and particles. Clean head components. Replace diaphragm and valve plates (see Section 8.3). Tab. 17 30 Translation of original Operating and Installation Instructions, english, KNF 121592-121595 07/16
Diaphragm Pumps N 026 FT.16 E and N 726 FTE Troubleshooting 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 Section 8.2.1). 2. Remove the pump. 3. Clean the pump (see Section 8.2.2). 4. Send the pump, together with completed Health and Safety Clearance and Decontamination Form (Chapter 12), to KNF stating the nature of the transferred medium. Translation of original Operating Instructions, English, KNF 121592-121595 07/16 31
Spare parts and accessories Diaphragm Pumps N 026 FT.16 E and N 726 FTE 10. Spare parts and accessories Spare parts N 026 FT.16 E Spare part Position* Order No. Wave diaphragm R 010227 Valve plate T 009712 O-ring X 010225 Sleeve Y 008823 Valve body C,D 010274 Disk spring W 010256 Tab. 18 *according to Fig. 11 N 726 FTE Spare part Position* Order No. Molded diaphragm K 006669 O-Ring S 010162 Valve plate T 008822 Sleeve U 008823 Valve body F,G 010163 Tab. 19 *according to Fig. 12 N 726 FT.29 E Spare part Position* Order No. Molded diaphragm K 006669 O-Ring S 010162 Valve plate T 008822 Sleeve U 021062 Throttle valve Z 021804 Valve body F 021063 Valve body G 020158 Tab. 20 *according to Fig. 13 Accessories Description Order No. Hose connector, PVDF, for tube ID 8 009111 Tube fitting, PVDF, for tube OD 6 009110 Tube fitting, PTFE, for tube OD 6 010343 Tube fitting, PTFE (elbow), 010344 for tube OD 6 Wrench for retainer plate for N 026 FT.16 E 018812 Tab. 21 32 Translation of original Operating and Installation Instructions, english, KNF 121592-121595 07/16
Diaphragm Pumps N 026 FT.16 E and N 726 FTE Returns 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. Translation of original Operating Instructions, English, KNF 121592-121595 07/16 33
Health and safety clearance and decontamination formdiaphragm Pumps N 026 FT.16 E and N 726 FTE 12. Health and safety clearance and decontamination form 34 Translation of original Operating and Installation Instructions, english, KNF 121592-121595 07/16
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