USER MANUAL AFC123 PERSONAL AIR SAMPLER COPYRIGHT
Contents
1. If flow decreases below 0 25 litre min circuit under compensating Decrease the flow slightly by turning VR1 clockwise and then decrease the flow back to 1 litre min by adjusting VR2 clockwise Re check the change in flow over the 10 40cm H20 pressure drop range Repeat these adjustments until minimal change in flow is achieved 4 Set the flow control pot VR2 for 2 litres min at 10cm H20 4a If flow increases above 2 1 litres min circuit over compensating AFC123 Personal Sampler Page 13 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 Email info casellausa com USA Web www casellausa com TF 800 366 2966 Increase the flow slightly by turning VR3 anti clockwise and then decrease the flow back to 2 litres min by adjusting VR2 anti clockwise Re check the change in flow over the 10 40cm H20 pressure drop range Repeat these adjustments until minimal change in flow is achieved 4b If flow decreases below 1 9 litres min circuit under compensating Decrease the flow slightly by turning VR3 clockwise and then increase the flow back to 2 litres min by adjusting VR2 clockwise Recheck the change in flow over 10 40cm H20 pressure drop range Repeat these adjustments until minimal change in flow is achieved When the correct compensation has been achieved at 2 litres min return to step 3 and re check the compensation at litre min It maybe necessary to rep2. 10 Disconnect the power supply and connect the battery to the harness Check that the display comes on Charging Socket Fig 2 Before removing note colour wires to each terminal so that when reconnecting correct polarity is observed also note correct position of socket Failure to do this could ruin the battery Unsolder wires from terminals Remove securing nut and insulating washer D lift out socket Battery Plug and Socket Fig 2 If battery is removed regularly for instance if two consecutive 8 hour samples are required observe that pins engage with sockets when connecting If pin or socket breaks or wires become unsoldered replace complete plug or socket To assemble plug or socket solder wires to pins then insert into moulding Never solder onto pins when they are inserted heat affects the moulding Observe correct pin positions Primary Filter Fig 2 If it is necessary to remove filter FM2 for cleaning remove 3 screws B lift off inlet fitting and gasket remove sintered bronze filter clean and replace AFC123 Personal Sampler Page 15 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 Email info casellausa com USA Web www casellausa com TF 800 366 2966 Ensure that gaskets 8351 6A72 are in place and remain flat when inlet fitting is screwed into place After assembly check for leaks Suction of 10cm H20 not to drop to less than 8 5cm H20 in 15
3. adjustment Service Hints Symptom Pump does not run green LED illuminated Possible cause Service Hint Battery fully discharged Replace with fully charged battery Wiring loom disconnected at some point Locate and resolder Fault on joint Replace circuit board Symptom Pump does not run green LED illuminated Possible cause Service Hint Eccentric bearing seizure Replace bearing Motor shaft seizure Replace motor Symptom Motor runs but pump inoperative AFC123 Personal Sampler Page 20 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 _ Email info casellausa com USA Web www casellausa com TF 800 366 2966 Possible cause Service Hint Grub screw securing eccentric to motor Re tighten shaft loose Symptom Pump runs but no air drawn Possible cause Service Hint Diaphragm rubber split Replace Pulsation damper membrane split Renew pulsation damper Flow potentiometer on bottom setting Re adjust Tube between pulsation damper and Replace valve chest split or disconnected AFC123 Personal Sampler Page 21 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 Email info casellausa com USA Web www casellausa com TF 800 366 2966 Symptom Pump runs but cannot achieve desired flow rate Possible cause Service Hint Leak on pump assembly Locate and correct D
4. between eccentric bearing and connecting rod components 2 Adjust bearing position for minimum current 3 Valves too tight relieve retaining force 4 The motor body can sometimes be rotated in its housing and the position of the eccentric on the motor shaft can also be adjusted to give its natural alignment with diaphragm centre line to affect a reduction of current consumption of as much as 10mA AFC123 Personal Sampler Page 11 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 Email info casellausa com USA Web www casellausa com TF 800 366 2966 Adjust the motor and eccentric position for lowest current at 2 litres min at 40cms H20 Motor Fig 1 This is not repairable New motors of the same type 104056B can be supplied 1 Removal of motor only as detailed in previous section Motor is removed with eccentric 2 Loosen grub screw SG502 and remove eccentric 3 Connect motor to adjustable DC power supply set at 6V current limit 50mA current consumption should be 18mA If figure is a lot higher motor has failed and should be replaced S Calibration Electronic Control Circuit If the pump does not run carry out the following checks 1 That battery volts appear at the input terminals of the control board For this the control board will have to be removed from the case lid Undo two screws Z002 65 Fig 2 2 That a voltage appears at the
5. motor terminals If no volts at the motor terminals the sampler should be returned for repair The electronic control board is not user serviceable unless specialised equipment and service personnel are available AFC123 Personal Sampler Page 12 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 _ Email info casellausa com USA Web www casellausa com TF 800 366 2966 To set up the electronics for the first time after service or pump replacement carry out the following procedure 1 Set up the power supply to 4 7V at 300mA and connect to the battery connector Turn VR4 full anti clockwise and switch pump on Slowly reduce the supply voltage and check that the yellow LED lights at between 4 55V to 4 65V 2 Continue reducing the supply and check that the pump switches off at between 4 10V to 4 25V Flow Control Set Up Procedure 3 Connect the pump inlet port to the test rig Set supply to 4 6V Turn the pump on and adjust the flow control pot VR2 for 1 litre min at 10cm H20 Increase the pressure drop to 40cm H20 3a If flow increases above 1 05 litres min circuit over compensating Increase the flow slightly by turning VR1 anti clockwise and then decrease the flow back to 1 litre min by adjusting VR2 anti clockwise Re check the change in flow over the 10 40 cm H20 pressure drop range Repeat these adjustments until minimal change in flow is achieved 3b
6. original packaging Insure to full value and ship pre paid Include a letter giving full details with your packing list Send to Casella Ltd Service Department Regent House Wolseley Road Kempston Beds MK42 7JY If purchased outside of the United Kingdom please return to your distributor Please note The contents of this Manual are subject to change without notice AFC123 Personal Sampler Page 17 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 Email info casellausa com USA Web www casellausa com TF 800 366 2966 7 Spares List When ordering from the list below quote the reference number TU103 Connecting tube 1 Metre B8313 Z Battery 4 cell complete with socket ES2 Battery packing strip 0 08 Metre B8358 z Charger 4 cell battery single outlet 04 100970D Charger 4 cell battery five outlet When ordering from the list below prefix with reference number 04 103063B Pump Fig 1 BRE35 Bearing 104056B Motor 0 002 1 Valve retainer 0 016 1 Valve seat sealing ring SG502 Eccentric to motor shaft screw Z002 13 Diaphragm clamp plate to valve head assembly Z002 16 Diaphragm clamp plate to valve head assembly to motor mounting screw 101189A Valve disc 102229A Eccentric 2 6mm stroke 102214A Bearing adaptor loff 102216A Motor mounting loff 102157C Diaphragm clamp plate loff 102158C Valve head loff 102159A Valve seat 2off 102160A Va
7. power limit will be reached at a drop of approximately 35cm H20 at this level the control limit will operate to switch the pump off At flow rates approaching 2 5 litres min the control limit will not operate and will only maintain 5 of present flow rate up to 25cm H20 Note The sampler should never be run without a filter on the inlet A suitable filter is put into the appropriate holder and is connected by a length of plastic tube to the inlet of the sampler Switch the pump ON slide the switch located in the recess at the back of the case The green light indicates the pump is running Setting of the flow rate is by adjustment of the potentiometer marked FLOW on the side of the case Turn clockwise to increase the flow rate To carry out the adjustment set the sampler up as described with the flowmeter attached upstream of the sampling head using flowmeter stand 01 100890B with the appropriate flowmeter The set up is described in separate leaflet hb3175 87 Sampling Heads and Accessories for High Flow Personal Samplers Check List Before Sampling Make sure the battery has been fully charged Ensure sampling head is correctly fitted with no leaks If flow rate cannot be obtained with similar conditions to previous occasions suspect leakage AFC123 Personal Sampler Page 5 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 Email info casellausa com USA Web www casell
8. seconds Damper Fig 2 Purpose of the damper is to smooth the pulsation s from the pump Diaphragms are fixed with fast setting adhesive it is not possible to fit new diaphragms in the event of failure If leak is suspected carry out suction test as specified above for primary filter fitting Replace complete damper if leakage is too great Battery Charger Parts have a long life we do not recommend any replacement interval If wires or joints break inside the plug CP604 on charger or inside the socket CS803 in charging lead A8301 1 replace with new parts Pins should not be resoldered On assembly solder wires to pins then insert into mouldings observing correct positions AFC123 Personal Sampler Page 16 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 _ Email info casellausa com USA Web www casellausa com TF 800 366 2966 6 Fault Finding Your personal sampler is designed and engineered for long and dependable service but as a precision instrument it should be given the best of care Typical problems are shown on the accompanying chart When testing refer to the exploded views contained in the instruction leaflet Other than service hints outlined in the instruction leaflet we recommend factory service by technicians trained and equipped to repair your sampler Should you wish factory repair assistance pack your sampler in a carton equal to the
9. to adopt its natural position and avoid any twisting forces Operational Check The following equipment is required flowmeter U tube water manometer with moisture trap restictor valve and variable d c power supply giving voltage and current readout Connect the pump to the damper and the damper and the damper inlet by means of a water manometer and to a restrictor valve through to the sampling head and flowmeter Float type flowmeter CM353 and stand 04 100890B or bubble meter Casella 5000 AFC123 Personal Sampler Page 10 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 _ Email info casellausa com USA Web www casellausa com TF 800 366 2966 Set the power supply to minimum voltage and current limit to 200mA Adjust the test rig and power supply to give a flow rate of 2 litres min at 40cm H20 The voltage should be less than 3 6 volts at a current of less than 130mA If unable to achieve this performance For high voltage 1 Check for leaks using test rig 2 Check that diaphragm is assembled tightly to the connecting rod 3 Check the valves for leakage this can be done by using the u tube manometer Leakage could be due to valve retaining force being to low apply pressure to head of retainer and move small o ring to increase retaining force Valve surfaces or valve seat surfaces imperfect discard and replace For high current 1 Poor alignment
10. Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 _ Email info casellausa com USA Web www casellausa com TF 800 366 2966 USER MANUAL AFC123 PERSONAL AIR SAMPLER COPYRIGHT The copyright in this document which contains proprietary information is vested in CASELLA LIMITED The contents of this document must not be used for purposes other than for which it has been supplied or reproduced or disclosed wholly or in part without the prior written permission of CASELLA LIMITED CASELLA LIMITED Regent House Wolseley Road Kempston Bedford MK42 7JY Telephone 44 0 1234 841441 Facsimile 44 0 1234 841490 Telex 827707 Email info casellacel com Web www casellacel com AFC123 Personal Sampler Page 1 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 _ Email info casellausa com USA Contents ls Totrod tton sesiune mnnon tan 3 2 Principle Of Operation rvecassnccivaswesenenewies 4 3s Operations pae 5 4 Maintenance and Servicing eee 6 De A ValIDEBU OI ceccscrctetenneeecnxeunes eewatens 12 6 Fault gB 100 07 00 eee ne er 17 Ty Spare PANG ecucc asad tarciatsiemedeentdedien 18 Bo PSCC ATOM sccsaesesteseavsdsesssenesdsasdineaseztencemdoss 24 9 Optional ACCessories wedsivissasbaveiisnnecaiviees 25 10 WV GUNNS 6 ache ccsaentaratecigeecathaeatedansnoa iguneses 26 AFC123 Personal Sampler Page 2 Handbook No
11. ELLA Amherst NH 03031 _ Email info casellausa com USA Web www casellausa com TF 800 366 2966 Remove valves and examine seating and valve tensions for faults Examine pump diaphragm for splits and the security of the diaphragm disc 09 102161A Note Do not block the inlet or outlet valve for more than 5 seconds at a time Pump Diaphragm Fig 1 1 Remove valve chest with diaphragm clamp plate by removing four securing screws 2 Loosen screw SG502 Pull eccentric 01 102229A and bearing BRE35 from motor 104056B shaft Loosen screw Z002 16 on motor mounting 09 10216B to release the motor 3 Lift out the connecting rod 09 102162B diaphragm 09 102164B and diaphragm disc 09 102161B assembly Note The diaphragm disc and the diaphragm are secured to the connecting rod by the push fit peg on the diaphragm disc and a small amount of Evostick or plastic cement To replace the diaphragm it should be possible to carefully prise the components apart If the locating pin is broken in this operation it will also be necessary to replace both the diaphragm disc and the connecting rod 4 To fit a new diaphragm check for perforations by holding it to the light and carefully stretching the rubber Rinse the diaphragm in methylated spirits to remove any trace of mould release agent or grease from handling Note The diaphragm should be assembled with the convolution facing towards the connecting rod AFC123
12. HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 _ Email info casellausa com USA Web www casellausa com TF 800 366 2966 AFC123 HIGH FLOW PERSONAL SAMPLER 1 Introduction The purpose of the instrument is to collect contaminate from air in the breathing zone of a person during a normal work period The choice for sampling head and type of analysis give comparisons with occupational Exposure Limited or MAC values allowed by regulation AFC123 Personal Sampler Page 3 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 Email info casellausa com USA Web www casellausa com TF 800 366 2966 2 Principle Of Operation Air containing contaminate is drawn through the sampling head at the optimum rate found by experience Suction is provided by a pump driven by a d c motor from a rechargeable nickel cadmium battery for up to 10 hours Flow rate is variable by the user to suit the sampling technique The tough lightweight plastic case houses a diaphragm pump with motor the electronic control board the ON OFF switch recessed into the case back the battery pack and pulsation damper The inlet to the damper contains a primary filter of sintered bronze to protect the pump if run without a sampling filter The socket on the case side takes a plug for recharging the battery in situ The battery pack is easily changed for continuous s
13. Personal Sampler Page 9 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 Email info casellausa com USA Web www casellausa com TF 800 366 2966 5 Apply a small amount of adhesive Evostick or plastic cement not super glue to the hole in the face of the connecting rod upper disc Push the components together ensuring that the diaphragm rubber strays central and is not distorted It should finally be gripped tightly at the radial edge of the diaphragm disc and connecting rod upper disc 6 The bearing BRE35 is a press fit on to the eccentric and should be replaced with a new bearing taken directly from its sealed package 7 Refit the diaphragm connecting rod assembly and locate on to the motor mounting ensuring that the outer sealing rim of the diaphragm fits in its groove Ensure that the shouldered face of the connecting rod bearing adaptor is adjacent to the motor mounting Fig 1 Refit valve chest diaphragm clamp plate assembly and tighten securing screws to just hold the diaphragm in position Refit motor and clamp in position Refit motor and clamp in position Fit eccentric and bearing on to motor shaft and push bearing into the connecting rod housing against the shoulder and tighten screw SG502 8 Connect the pump to the damper and run at low speed and while it is running tighten the valve chest diaphragm assembly to the motor mounting This allows the diaphragm
14. ad 15 CASELLA Amherst NH 03031 _ Email info casellausa com USA Web www casellausa com TF 800 366 2966 Pump Unit Fig 1 Note Servicing and reassembly of the pump unit should be carried out in a clean and dust free environment Dust particles under the valves or in the bearing will lower the pump performance and lead to higher operating voltages and current 1 Undo four screws remove case lid Fig 2 Disconnect and remove battery 2 Remove two screws marked a Fig 2 Remove tube connector from damper outlet and lift out pump unit Unsolder motor connections from the control board Valves The valves are made from synthetic rubber 1 Remove valve chest 09 102158C with diaphragm clamp plate 09 102157C by removing four securing screws Z002 16 Fig 1 2 Remove two screws Z002 13 which hold the valve chest to the diaphragm clamp plate and separate the two parts Valve assemblies are retained in the valve chest by the O ring seals O 106 1 3 Note the orientation of the valve assemblies so that they can be correctly reassembled 4 Remove the O ring O 002 1 from the ends of the valve retainers 09 102160A from the ends of the valve retainers 09 102160A Push the valve retainers through the valve seat 09 102159A to remove valve 01 101189A AFC123 Personal Sampler Page 7 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 Email i
15. ausa com TF 800 366 2966 4 Maintenance and Servicing 7 1 Service Department Casella s in house service department offers a comprehensive range of repair and calibration services designed to effect a fast and efficient back up for all our products The Service Department is operated under the scope of our BSI registration for products manufactured by us We will however undertake the repair of other manufacturers equipment For further information please contact our Service Department at our Bedford premises We will be happy to provide quotations for individual repairs or provide annual maintenance under contract Battery If the flow rate normally found throughout accustomed head cannot be maintained for a given time then check that 1 If filter disc is used is resistance too high High dust levels high relative humidity too small a pore size may plug the filter after a few hours Replace with clean filter If now satisfactory change disc more often 2 Battery maybe at the end of its service life To check charge the battery for 14 hours disconnect the battery from the charger and discharge through a 27 ohm resistor rated at 2 watts or more to 4 4 volts approximately 51 2 hours Repeat charge discharge twice If 177mA cannot be produced for 51 2 hours discard the battery as it is beyond useful life AFC123 Personal Sampler Page 6 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Ro
16. eat steps 3 and 4 several times to ensure that the flow remains within 5 at both flow rates 1 litre min 0 05 litres min and 2 litres min 0 1 litres min 5 Set the flow control pot VR2 to minimum the flow should be 0 45 litres min If not adjust VR1 slightly Set flow pot for 0 5 litres min Check that a 10 35cm H2O change in pressure drop does not alter the flow by more than 0 075 litres min 6 Set the flow control pot VR2 to minimum the flow should be 0 45 litres min Check that a 10 35cm H20 change in pressure drop does not alter the flow by more than 0 03 litres min 7 Set the flow control pot VR2 for 2 litres min at 40cm H20 Check current is less than 145mA Increase pressure to 44cm H20 and adjust vr4 until the red LED just switches on The pump should stop running after 8 seconds and the red LED should remain on AFC123 Personal Sampler Page 14 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 _ Email info casellausa com USA Web www casellausa com TF 800 366 2966 8 Set the flow control pot VR2 for 2 litres min at 40cm H20 Check current is less than 145mA Increase pressure to 44cm H20 and adjust VR4 until the red LED just comes on The pressure drop should be 40cm H20 or greater and the flow rate should still be within 0 05 litres min 9 The counter should display the time in minutes since the pump was connected to the supply
17. hift working One light emitting diode is seen through the case front green to indicate pump running Also fitted is a battery low cut off which will turn the pump off if it is inadvertently left running This prevents the cells being damaged by deep discharge and also gives maximum life to the battery Size of sampler 120 75 44 mass of 440 grammes causes no significant handicap to wearer during work Note This leaflet describes how the sampler works and how to maintain it It does not detail how to sample or analyse collected samples or how to select methods for various hazards Consult Occupational Health and Hygiene Division of Health and Safety Executive Research Association of the industry concerned or an Advisory and Analytical Service Information on available sampling heads and accessories is given in a separate leaflet HB3175 87 AFC123 Personal Sampler Page 4 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 _ Email info casellausa com USA Web www casellausa com TF 800 366 2966 3 Operation The battery must be fully charged to ensure an 8 hour run especially for filters giving a high initial pressure drop The sampler is designed to work at a maximum efficiency within the flow rate of to 2 litres min and to maintain the set flow rate within 5 for pressure drop of up to 40cm H20 At lower flow rates of the specified range down tom0 5 litres min the
18. irt under valves or valves damaged Replace Inlet filter clogged Remove and clean Flow potentiometer inoperative Replace circuit board Symptom Cannot obtain full shift working even when pressure drop does not exceed 40cm H20 at 2 litres min Possible cause Incomplete charge Recharge Battery below capacity Fully charge and check voltage should be 4 8V 5 4V If below check output from charger should be 110 125mA If output correct replace battery High current consumption due to Locate and correct mechanical defect in pump AFC123 Personal Sampler Page 22 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA _a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 Email info casellausa com USA Web www casellausa com TF 800 366 2966 8 Specification Flow range 0 5 to 2 51 min Flow Control Accuracy or 5 of flow setting Nominal Battery Setting 4 8v Run Time at least 8 hours Operating temperature 0 to 40c Timer Accuracy 0 01 in 24 hours Dimensions 120 74 50mm Weight 500g AFC123 Personal Sampler Page 23 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 Email info casellausa com USA Web www casellausa com TF 800 366 2966 9 Optional Accessories B8358 Z Battery charger B8313 Z Spare battery 10 Warnings AFC123 Personal Sampler Page 24 Handbook No HB3182 02 Issue2 JULY 1994
19. lve retainer 2off 102161A Diaphragm disc loff 102162B Connecting rod loff 102164B Diaphragm loff AFC123 Personal Sampler Page 18 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA 17 Old Nashua Road 15 Amherst NH 03031 Email info casellausa com Web www casellausa com TF 800 366 2966 Spare Parts Pump in case Fig 2 CP604 CS901 2 CP605 CS803 CS901 2 CS804 CS1 SW51 GC106 FM2 0 004 1 0 010 1 SM1830 8 SM2230 8 SM2258 8 SM912 8 NUM160 Z002 65 Z24CZ TU114 SP104 7576 A28 8351 6A72 8351 6A73 B8351 7 102211C 103179A 103067C AFC123 Personal Sampler Handbook No HB3182 02 Issue2 JULY 1994 CASELLA USA Plug from jack socket Socket from battery Charging socket ON OFF switch Inlet cover Inlet filter Lid screw retainers Inlet damper seal Inlet fitting to case damper screw Belt clip to case screw Lid to case bottom screw ON OFF switch to case screw ON OFF switch to case nut Pcb to case lid screw Pump to case screw Connecting tube pump to damper Tube support spring pump to damper Belt clip Damper to case gasket Inlet fitting Damper Pump assembly complete with motor Case and lid complete with labels Complete pcb assembly Page 19 Casella USA a 17 Old Nashua Road 15 CASELLA Amherst NH 03031 Email info casellausa com USA Web www casellausa com TF 800 366 2966 Accessories HK2 Eccentric to motor shaft Hexagon wrench HK304 Flow
20. nfo casellausa com USA Web www casellausa com TF 800 366 2966 5 Clean valve seat and make sure that the valve face is smooth and unmarked Check that new valves have no rough or frayed edges which may result in leakage Rinse the valves in methylated spirits to remove any trace of mould release agent and very lightly dust with fine talc before assembly 6 Refit the valve and retainer to the valve seat and fit the O ring O 002 1 over the retainer until it engages under the shoulder of the stem The retaining force on the valve can now be adjusted by gentle pressure in the appropriate direction and should be such that the shoulder under the head of the retainer sits gently on the upper surface of the valve so that the valve can just rotate Excessive initial force on the valve will cause high current consumption 7 Reassemble in to valve chest ensuring correct orientation of valves Suction valve assembly adjacent to the uppermost Discharge valve assembly has the valve facing downwards Ensure O rings O 016 1 are fitted 8 Reassemble diaphragm clamp plate to valve chest and refit the assembly to the motor mounting with screws Z002 13 Performance Checks Before Replacing Leak Check 1 Valve chest securing screws not tightened 2 Pump diaphragm may have failed 3 Valves may not be correctly tensioned AFC123 Personal Sampler Page 8 Handbook No HB3182 02 Issue2 JULY 1994 Casella USA a 17 Old Nashua Road 15 CAS
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