Operating and Installation Instructions Diaphragm Gas Sampling Pumps

Operating and Installation Instructions Diaphragm Gas Sampling Pumps UN026FT.16I UN726FTI UN726FT.29I KNF Neuberger, Inc 2 Black Forest Rd Trenton, NJ 08691-1810 Phone: 609-890-8600 Fax: 609-890-8323 www.knf.com/usa.htm Ident#125592-211289 Revision (06/12) 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... 28 10. Spare parts and accessories... 30 11. Product Return... 31

About this document Diaphragm Pumps UN026FT.16I and UN726FTI 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 "PU" or "MPU") 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 Consequences if not observed DANGER warns of immediate danger Death or serious injuries and/or serious damage are the consequence. WARNING CAUTION Tab. 1 warns of possible danger warns of a possibly dangerous situation Death or serious injuries and/or serious damage are possible. Minor injuries or damage are possible. 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

Diaphragm Pumps UN026FT.16I and UN726FTI 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. 3

Safety Diaphragm Pumps UN026FT.16I and UN726FTI 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 leads 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, be sure to 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

Diaphragm Pumps UN026FT.16I and UN726FTI Safety Customer service and repairs assembled is in conformity with 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 pumps conform to the EC Directive 2004/108/EC concerning Electromagnetic Compatibility. The following harmonized standards have been used: 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. 5

Technical data Diaphragm Pumps UN026FT.16I and UN726FTI 4. Technical data Pump materials UN026FT.16I Assembly Pump head Diaphragm Retaining plate Valve Material* PTFE PTFE Stainless steel PTFE Tab. 2 *according to DIN ISO 1629 und 1043.1 UN726FTI UN726FT.29I Assembly Pump head Diaphragm Valve Material* PTFE PTFE-coated PTFE Tab. 3 *according to DIN ISO 1629 und 1043.1 Pneumatic values UN026FT.16I 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) UN726FTI 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) UN726FT.29I 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

Diaphragm Pumps UN026FT.16I and UN726FTI 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 (UN726) 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. 7

Design and function Diaphragm Pumps UN026FT.16I and UN726FTI 5. Design and function Design 1 Pneumatic outlet 2 Pneumatic inlet 3 Pump head 4 Motor 5 Terminal box Fig. 1: Diaphragm pump UN026FT.16I 1 Pneumatic outlet 2 Pneumatic inlet 3 Pump head 4 Capacitor 5 Motor 6 Terminal box Fig. 2: Diaphragm pump UN726FTI 8

Diaphragm Pumps UN026FT.16I and UN726FTI 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 UN726FT.29I Function 1 Outlet valve 2 Inlet valve 3 Transfer chamber 4 Diaphragm 5 Eccentric 6 Connecting rod 7 Pump housing 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 housing (7) by the diaphragm. The pumps can be used as vacuum pump or compressor. However, pressure and vacuum cannot be generated simultaneously. 9

Installation and connection Diaphragm Pumps UN026FT.16I and UN726FTI 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 (UN026FT.16I), Fig. 6 (UN726FTI) or Fig. 7 (UN726FT.29I) for the mounting dimensions. Fig. 5: Mountings UN026 FT.16I with capacitor motor (All dimensional tolerances conform to DIN ISO 2768-1, Tolerance Class V) Fig. 6: Mountings UN726FTI with capacitor motor (All dimensional tolerances conform to DIN ISO 2768-1, Tolerance Class V) 10

Diaphragm Pumps UN026FT.16I and UN726FTI Installation and connection Cooling air supply Installation location Fig. 7: Mountings UN726FT.29I 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 UN026FT.16I: 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. 11

Installation and connection Diaphragm Pumps UN026FT.16I and UN726FTI 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

Diaphragm Pumps UN026FT.16I and UN726FTI 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. 13

Operation Diaphragm Pumps UN026FT.16I and UN726FTI 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. Pump standstill 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. 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

Diaphragm Pumps UN026FT.16I and UN726FTI 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. 15

Operation Diaphragm Pumps UN026FT.16I and UN726FTI X Y Adjusting screw Knurled nut Fig. 10: Setting the flow (UN726 FT.29I) 16

Diaphragm Pumps UN026FT.16I and UN726FTI Servicing 8. Servicing 8.1. Servicing schedule Component Pump Molded diaphragm and valve plates (pump range UN726) or wave diaphragm and valve plates (UN026FT.16I) 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. 17

Servicing Diaphragm Pumps UN026FT.16I and UN726FTI 8.3. Replacing wave diaphragm and valve plates 8.3.1. UN026FT.16I 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 valve bodies C and D 3. Remove the 4 allen screws E, keeping disk springs W on carrier F. 4. Take off pressure plate G, sleeve H and head K mark the fitting position before removing. 5. Remove the 4 cheese head screws N and cover plate P. 18

Diaphragm Pumps UN026FT.16I and UN726FTI Servicing Replacing valve plates 1. Loosen valve bodies C and D with a socket wrench and remove them. 2. Take sleeve Y out of both holes of head K and put one new sleeve into each hole. For the position of sleeves 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. Replace O-ring X in valve body D (inlet side) by a new one. 7. 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. 8. 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 connection rod extension M with an open-end spanner to prevent it from 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 connection rod extension M by hand. 4. Turn the counterweight V until the connection rod extension is in mid-stroke. 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 connection 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. 5. Replace cover plate P. 6. Check and ensure the gas-tightness of the pump head and the tubing. 19

Servicing Diaphragm Pumps UN026FT.16I and UN726FTI Specification A Socket screw B Clamp ring C,D Valve body E Socket screw F Carrier G Pressure plate H Sleeve K Head L Retaining plate M Connection rod extension N Cheese head screw P Cover plate R Diaphragm S Diaphragm support T Valve plate U Insulation washer V Counterweight W Disk spring X O-ring Y Sleeve Inlet valve: Pressure valve: Fig. 11: Pump parts UN026FT.16I 20

Diaphragm Pumps UN026FT.16I and UN726FTI Servicing Conditions Spare parts 8.3.2. UN726FTI 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. Replacing valve plates 1. Loosen valve bodies F and G with a socket wrench and remove them. 2. Take sleeve U out of both holes of head B and put one new 21

Servicing Diaphragm Pumps UN026FT.16I and UN726FTI sleeve into each hole. For the position of sleeves see detailed view in Fig. 12. 3. Put the two new valve plates T into the head B. Observe the correct position of the valve plates (see detailed view in Fig. 12): Pressure side of the pump: The six projections face upwards. Suction side of the pump: The six projections face downwards. 4. Fit a new O-ring S to each of the valve bodies F and G. 5. Screw the valve bodies F and G into head B and tighten them moderately with a socket wrench. 6. 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 felt-tip 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. 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. 22

Diaphragm Pumps UN026FT.16I and UN726FTI Servicing 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 UN726FTI 23

Servicing Diaphragm Pumps UN026FT.16I and UN726FTI 8.3.3. UN726FT.29I 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 bodies F and G with a socket wrench and remove them. 24

Diaphragm Pumps UN026FT.16I and UN726FTI Servicing 2. Take sleeve U out of both holes of head B and put one new sleeve into each hole. For the position of sleeves see detailed view in Fig. 13. 3. Put the two new valve plates T into the head B. Observe the correct position of the valve plates (see detailed view in Fig. 13): Pressure side of the pump: The six projections face upwards. Suction side of the pump: The six projections face downwards. 4. Fit a new O-ring S to each of the valve bodies F and G. 5. Screw the valve bodies F and G into head B and tighten them moderately with a socket wrench. 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. Lay the clamp rings E on head B; tighten the three allen screws D only 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 mid-position. 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 felt-tip pen marking. 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. 25

Servicing Diaphragm Pumps UN026FT.16I and UN726FTI 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 UN726FT.29I 26

Diaphragm Pumps UN026FT.16I and UN726FTI Servicing 8.3.4. Changing the throttle valve (UN726FT.29I) 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. 27

Troubleshooting Diaphragm Pumps UN026FT.16I and UN726FTI 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 28

Diaphragm Pumps UN026FT.16I and UN726FTI Troubleshooting Fault cannot be rectified If you are unable to determine any of the specified causes, send the pump to KNF Customer Service (see Page 1 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 to KNF with a filled out decontamination declaration (Section 11) and specification of the medium transferred. 29

Spare parts and accessories Diaphragm Pumps UN026FT.16I and UN726FTI 10. Spare parts and accessories Spare parts UN026FT.16I 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 UN726FTI Spare part Position* Order No. Molded diaphragm K 006669 O-Ring S 010225 Valve plate T 008822 Sleeve U 008823 Valve body F,G 013659 Tab. 19 *according to Fig. 12 UN726FT.29I 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 30

Diaphragm Pumps UN026FT.16I and UN726FTI Product Return 11. Product Return KNF provides warranty and non-warranty repair services for all products. A Return Material Authorization (RMA) number is required for all product returns. To receive an RMA number, submit a completed Decontamination Declaration form to rma@knf.com The Decontamination Declaration form can obtained from our website or by contacting KNF Technical Services. http://www.knf.com/pdfs/decontamdec.doc Phone: 609-890-8600 Product return instructions will be provided when the RMA is issued. KNF Neuberger, Inc 2 Black Forest Rd Trenton, NJ 08691-1810 Phone: 609-890-8600 Fax : 609-890-8323 Website: www.knf.com/usa.htm 31