597357-7359 manual
Contents
1. Liquid Switch User s Manual Harvard Liquid Switch 55 3438 Harvard Apparatus Liquid Switch Manual Table of Contents SUBJECT PAGE NO Table of 1 General Information Warranty and Repairs 2 Cleaning and Rotor Replacement Instructions 3 5 Disassembly Valves with External Spring Hardware Disassembly Valves with Preload ly csciasisccccasnesacssidsceuanencdeiastedscasebencsaaieeiaiend 4 MM IN edo ec 5 Assembly and Alignment Procedure New or Used Rotor 6 10 Leak Detection ARTEA R 11 Flow lor Feel nee 12 Harvard Apparatus Liquid Switch Manual General Information Serial Numbers All inquires concerning our product should refer to the serial number of the unit Serial numbers are located on the rear of the chassis Calibrations All electrical apparatus is calibrated at rated voltage and frequency While the flow will stay cali brated the peak will vary Warranty Harvard Apparatus warranties this instrument for a period of one year from date of purchase At its option Harvard Apparatus will repair or replace the unit if it is found to be defective as to workma2. amp ring between the valve and the actuator and remove the valve from the actuator Using a 7 16 open wrench or nut driver loosen and remove the 10 32 hex nuts from the threaded seal shaft Slide the coil spring and washers from the shaft taking care to note their order for reassem bly later Grasp the valve firmly and give a slight rotation to the 1 4 shaft of the rotor to break apart the sealing surfaces Alternatively grip the valve with the 1 4 shaft pressed firmly into the palm of the hand to restrict its travel and tap the end of the threaded shaft After the sealing surfaces are broken free in the above operation carefully pull the rotor out of the tapered interior of the valve body Manual Liquid Switch Harvard Apparatus Cleaning amp Rotor Replacement Instructions Disassembly Valves with Preload Assembly Perform all disassembly operations in a clean well lighted area Flush all hazardous or toxic mate rials from the valve before starting 1 Unscrew the preload assembly from the valve For valves rated at pressures over 1000 psi it is helpful to unscrew the preload 1 2 turn before trying to unscrew the preload itself Figure 1 2 Engage the end of the rotor Figure 2 with a pencil type magnet 3 Step the actuator through several positions to break apart the sealing surfaces and carefully withdraw the rotor form the valve body with the magnet 4 For a valve on a standoff Use 7 64 he
3. ening for flow in the following steps it is helpful if the fittings are removed from the port under consideration but left in the adjacent ports If all the fittings have been removed install a loop connecting the two ports adjacent to the target port to better isolate the sound of the flow CAUTION Up to this point the instructions have been applied to both air and electri cally actuated valves Because the two types of actuators rotate in opposite directions it is necessary for the instructions to diverge at this point For an electrically actuated valve proceed with the steps on the next page For an air actuated valve proceed with the steps on page 10 Harvard Apparatus Liquid Switch Manual Assembly amp Alignment Procedure new or used Rotor For an electrically actuated valve continue with this step 11 11 With the valve facing you and the actuator behind the valve the port to the left of or coun terclockwise form the alignment inlet corresponds to Position 1 STUW With the common port at 6 o clock as the inlet the port to the left of or counterclockwise from the common port at 12 o clock corresponds to Position 1 If the assembly was done properly in Step 5 air will be coming out of the port to the right of the alignment inlet or common port at 12 o clock for STUW s If so proceed to Step 12 If the initial alignment was off a little grip the valve and rotate it slightly in either direct
4. he preload socket adjustment screw was unscrewed 1 2 turn in Disassembly Step 1 use the spot of paint as a guide to return it to its original position 1 valve may be tested with a gas leak detector If a leak detector is unavailable the valve may be pressurized with an appropriate gas and immersed in a solvent with low surface ten sion e g 2 propanol Be careful to test for gross leaks before immersing the valve Wear eye protection 2 If the valve leaks tighten the nuts in 1 4 turn increments cycling the valve through a com plete revolution between each 1 4 turn of tension until leaking stops Test after each addi tional 1 4 turn Never tighten the spring to the point where its windings touch one another STUW SDUW If the valve leaks tighten the socket adjustment screw in increments of approximately 1 16 turn cycling the valve through a complete revolution between each increment Test after each addi tional 1 16 turn 12 Harvard Apparatus Liquid Switch Manual Flow Chart 4 position SC Valve Sample Inlets Drain common One Sample Out Syringe Pump
5. ion the actuator keeps the rotor fixed until gas flows from this port This sets up the staging area for the approach to Position 1 12 Grip the valve and slowly rotate it clockwise until the first First mark traces of flow are heard from the port of Position 1 A 913 0 13 While holding the valve steady use soft pencil or ink mark 4 er to make a mark on the valve body or standoff correspon UY ding to the slot in the actuator clamp ring This slot makes a S k clear reference point for observing relative rotational posi sep 15 tions Figure 5 Figure 5 Marking valve or standoff during alignment procedure electri 14 Continue the slow manual clockwise rotation of the valve cally actuated body through the point of peak flow and on until the flow stops or is barely perceptible as in Step 12 15 Make another mark as in Step 13 Figure 5 16 Make a third pencil mark centered between the first two and rotate the valve counterclock wise until this midway mark is reached 17 Wile holding the valve steady firmly tighten the screw in the clamp ring The rotor should be properly positioned at the point of maximum flow where the actuator is stepped to the next position 10 Harvard Apparatus Liquid Switch Manual Assembly amp Alignment Procedure new or used Rotor For an air actuated valve continue with this step 11 11 With the
6. ion indicator doesn t read 1 flip the switch to the HOME position For an air actuator determine that the actuator is in Position 1 but then if necessary override or disable the means of pulsing the air to the actuator so that pressure is continuously applied to the actuator port nearest the valve 9 Place the valve on the actuator standoff By convention the factory alignment places the common port s at 12 o clock Re orienting the standoff or the slotted coupling in close mount applications on the square drive of the actuator allows three other possibilities STUW Either common port may be at 12 o clock For a closemount valve make sure that the ends of the pin in the rotor are engaged by the slots of the coupling Tighten the screw in the clamp ring enough to keep the valve from falling out when it is released but make sure it is loose enough to allow the valve to be turned during the alignment procedure For a valve on a standoff make sure that the ends of the pin in the rotor are engaged by the slots of the standoff drive shaft and tighten the clamp ring screw Loosen the screw in the clamp ring which holds the standoff to the actuator enough to allow the valve standoff assembly to be turned during the alignment procedure 10 Establish a flow of clean gas 50 psi is adequate into the alignment inlet STUW Establish gas flow into the common port at 6 o clock alignment inlet in Figure 4 NOTE When list
7. is manner at several points in the procedures below The alignment procedure is a way of centering the perpendicular engraving on the selected port by determining the point at which flow begins when the engraving is just beginning to intersect the port and the point at which flow ends when the engraving has ceased to intersect the port and centering the rotor between those two points 1 Make sure that all sealing surfaces are clean and dry 2 Ifa used rotor is to be reinstalled clean with a light solvent and blow the passages clean with compressed air Discard the rotor if any scratches are visible between ports 3 Locate the common port offset toward the small end of the valve interior In SD and SC valves this is the only common port This port called the alignment inlet will be the designated inlet throughout this procedure STUW In the case of the STUW with both common ports at the same end either will serve the current purpose 4 Puta nut in the port corresponding to the last or highest numbered position For an electric actuator With the valve oriented as in Figure 4 the nut goes in the port above the alignment inlet For an air actuator With the valve oriented as in Figure 4 the nut goes in the port below the alignment inlet 5 Locate the flow passages s perpendicular to the ring s that go around the rotor Note the pin which passes through the shaft The end of the pin on the same side of the rotor as the flow pa
8. niform as well as highly polished If any scratches are visible between the ports or anywhere else sug gesting a potential leakage path or wear source the valve should be returned to the factory for regrinding If the rotor s sealing surface shows any scratches and or a narrowing of the sur face flow passages replacement is necessary If the valve body interior is in good condition a field replacement of the rotor may be effected using the following procedure Manual Liquid Switch Harvard Apparatus Assembly amp Alignment Procedure new or used Rotor The valve will have either one SD and SC types or two SF and ST types rows of ports evenly spaced around the circumference of the body See Figure 4 In addition there will be one SD and SF types or two SC and ST types common ports offset to either side of these rows The rotor will have either one or two flow passage s appearing as engraved rings around the seal which intersect the common port s Flow passage s perpendicular to the rings s connect the ring s to the selected port s STUW The only configuration which does not fall within this description is the STUW Unlike the stan dard ST these have one row of port around the circumference with two common ports offset in the same direction The common ports are 180 apart so only one shows in Figure 4 Special instructions and descriptions regarding STUW and or SDUW valves will be highlighted in th
9. nship or material This warranty does not extend to damage resulting from misuse neglect or abuse normal wear and tear or accident This warranty extends only to the original customer purchaser IN NO EVENT SHALL HARVARD APPARATUS BE LIABLE FOR INCIDENTAL OR CONSE QUENTIAL DAMAGES Some states do not allow exclusion or limitation of incidental or conse quential damages so the above limitation or exclusion may not apply to you THERE ARE NO IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE OR OF ANY OTHER NATURE Some states do not allow this limitation on an implied warranty so the above limitation may not apply to you If a defect arises within the one year warranty period promptly contact Harvard Apparatus Inc 84 October Hill Road Building 7 Holliston Massachusetts 01746 1371 using our toll free number 1 800 272 2775 Goods will not be accepted for return unless an RMA returned materials author ization number has been issued by our customer service department The customer is responsi ble for shipping charges Please allow a reasonable period of time for completion of repairs replacement and return If the unit is replaced the replacement unit is covered only for the remainder of the original warranty period dating from the purchase of the original device This warranty gives you specific rights and you may also have other rights which vary from state to state Repair Facilities and Parts Harva
10. rd Apparatus stocks replacement and repair parts When ordering please describe parts as completely as possible preferably using our part numbers If practical enclose a sample or draw ing We offer complete reconditioning service CAUTION This pump is not registered with the FDA and is not for clinical use on human patients CAUTION NOT FOR CLINICAL USE ON HUMAN PATIENTS Harvard Apparatus Liquid Switch Manual Cleaning amp Rotor Replacement Instructions Perform all other system checks before working on the valve Since any contact between the interior of the valve body and the metal of the rotor is likely to cause damage do not take the valve apart unless the system malfunction 1s definitely isolated to the valve If disassembly is absolutely necessary make certain to carefully observe the instructions listed below for disassembly cleaning and reassembly Disassembly Valves with External Spring Hardware Perform all disassembly operations in a clean well lighted area Flush all hazardous or toxic mate rials from the valve before starting 1 For a valve on a standoff Use 7 64 hex driver to loosen the 6 32 x 5 8 socket head screw in the clamp ring which holds the valve to the standoff tube not the one which holds the standoff to the actuator and remove the valve from the actuator standoff assembly For a closemount valve Use a 7 64 hex driver to loosen the 6 32 x 5 8 socket head screw in the cl
11. ssages s perpendicular to the rings will be used as a pointer Figure 4 Harvard Apparatus Liquid Switch Manual Assembly amp Alignment Procedure new or used Rotor STUW SDUW The pointer will be that end of the tab which is stamped P H or E denoting the valve series Fig 3 POINTER M 6 Insert the rotor in the valve body with the pointer centered on the Figure 3 nut being careful not to touch the polished interior surface of the valve body with any of the metal parts of the rotor PAIRED INLETS OUTLETS SF Flow Through Trapping Figure 5 Multiposition valve port conventions and schematic flow diagrams Position 1 port designations applicable to multiposition valves on electric actuators only 7 Slide the three washers Gn this sequence 3 4 OD washer Teflon or polyimide washer stan dard 1 2 OD stainless steel washer over the 3 16 diameter threaded shaft while holding the rotor pressed firmly into the valve body The flat side of the 3 4 back washer should rest the rear collar of the valve Next put the spring and the stainless hex nut in place Tighten the nut 1 2 turn beyond finger tight and butt the elastic lock nut against it Harvard Apparatus Liquid Switch Manual Assembly amp Alignment Procedure new or used Rotor STUW SDUW Simply screw the preload on until the threads bottom out 8 For an electric actuator plug the actuator in If the posit
12. valve facing you and the actuator behind the valve the port to the right of or clock wise from the alignment inlet corresponds to Position 1 STUW With the common port at 6 o clock as the inlet the port to the right of or clockwise from the common port at 12 o clock corresponds to Position 1 If the assembly was done properly in Step 5 air will be coming out of the port to the left of the alignment inlet common port at 12 o clock for STUW s If so proceed to Step 12 If it is not grip the valve and rotate it counterclockwise until gas flows from this port Depending on which way the initial alignment was off this will take either a very slight rotation or nearly a full revo lution Even though flow might have been achieved by a slight clockwise rotation the air actua tor will not keep the rotor fixed against a force in that direction This sets up the staging area for the approach to Position 1 12 Grip the valve and rotate it counterclockwise until the first traces of flow are heard from the port of Position 1 13 While holding the valve steady use a soft pencil or ink maker to make a mark on the valve body or standoff corresponding to the slot in the actuator clamp ring This slot makes a clear fixed reference point for observing relative rotational positions Figure 6 14 Continue the slow manual counterclockwise rotation of the valve body through the point of peak flow and on until the flow stops or is barel
13. x driver to loosen the 6 32 x 5 8 socket head screw in the clamp ring which holds the valve to the standoff tube not the one which holds the standoff to the actuator and remove the valve from the actuator standoff assembly For a closemount valve Use a 7 64 hex driver to loosen the 6 32 x 5 8 socket head screw in the clamp ring between the valve and the actuator and remove the valve from the actuator Valve Body Preload Assembly Socket Adjustment Screw Manual Liquid Switch Harvard Apparatus Cleaning amp Rotor Replacement Instructions Cleaning 1 2 Using clean dry air blow any loose debris from the valve body and the rotor Using a strong solvent and an optical quality lint free wiper such as a Kimwipe wipe away any loosely bound seal material which may have worn free and adhered to either surface Avoid using halocarbon solvents if the valve is to be used in a system with electron capture detection since some of the solvents may persist at the trace level Be sure to consult the Manufacturer s Data Safety sheet for whatever solvent is utilized Note If the valve has been used with aqueous buffer solutions and some leakage has occurred wipe the seal ing surfaces of the valve with a water moistened Kimwipe before using a nonpolar solvent to clean any seal material still adhering to the valve interior Visually inspect the interior of the valve body The conical surface should appear u
14. y perceptible as in Step 12 15 Make another mark as in Step 13 Figure 6 staat irst mart step 13 16 Make a third pencil mark centered between the first two Third mark and rotate the valve clockwise until this midway mark is reached Figure 6 17 While holding the valve steady firmly tighten the screw in Second mark step 15 the clamp ring The rotor should be properly positioned Figure 6 Marking valve or standoff during at the point of maximum flow when the actuator is 5 alignment procedure air actuated stepped to the next position It is a good idea to cycle the valve through all its positions to be certain everything is functioning properly In some cases it is possible to do an additional alignment check by simply looking down the fitting detail and into the port as the valve is stepped from position to position If it is a valve which has a relatively short distance from the bottom of the detail to the internal taper the engraved dimples on the seal are visible as they come into alignment with the port 11 Harvard Apparatus Liquid Switch Manual Leak Detection The assembly instructions above put a minimum amount of tension on the spring to facilitate the manual adjustments required in the alignment procedure Before proceeding with this section add an additional full turn to the hex nuts on the rotor shaft and cycle the valve through a complete revolution STUW SDUW If t
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