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ARU-700

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2. inc Equipment Division ARU 700 ARU 1200 amp ARU 2100 115 230 VOLT User s Manual e Installation e Operation e Maintenance CPAC Equipment Division 2364 Leicester Road P O Box 175 Leicester New York 14481 716 382 3223 Fax 716 382 9481 www cpacequipment com TABLE OF CONTENTS RECOMMENDATIONS IMPORTANT SAFEGUARDS DESCRIPTION Items Included in Shipping Container Automatic Terminal Electrolytic Silver Recovery Efficient Recovery Automatically Matched to Your Needs SPECIFICATIONS CONTROLS Figure 1 ARU Control Panel LED Digital Display Keypad Status Lamps INSTALLATION AND SET UP Connecting Unit to the Processor Programming the ARU Table 1 OPERATIONS Table 2 Amp Hours Key Fail Safe Procedure Set Point Background Information Effects Changing the Point Setting Cell Voltage Measurement Volume Count optional DESILVERING CATHODE Desilvering Cathode by User MAINTENANCE AND SERVICE Preventative Maintenance Regular Cleaning and Inspection TROUBLE SHOOTING GUIDE SCHEMATICS 12 16 12 13 14 14 14 15 15 16 16 17 17 18 19 19 19 20 21 22 26 SPARE PARTS LIST 27 29 DISCLAIMER 30 STATEMENT OF WARRANTY 31 RECOMMENDATIONS Read the entire instruction manual before installation or operation of the ARU 700 ARU 1200 and ARU 2100 silver recovery system It will help you to understand the operation of the system how various sub assemblies work together a
3. 52cm 15 D 15 W x 26 5s H 38cm x 38cm x 68cm 5 0 gal 19 liters 9 0 gal 34 liters 115 230 VAC 50 60 Hz ARU 700 ARU 1200 ARU 2100 ARU 700 ARU 1200 ARU 2100 ARU 700 ARU 1200 ARU 2100 75 Watts 90 Watts 105 Watts 30 Ibs 33 Ibs 38 Ibs 14 kilograms 15 kilograms 18 kilograms 40 Ibs 43 Ibs 49 Ibs 18 kilograms 19 kilograms 22 kilograms P Tank Polyethylene Electrical shroud ABS Plastic Cathode Stainless Steel Anode Carbon Unit is internally pre plumbed Complete with all fittings CONTROLS Front Panel of Silver Recovery Unit AMPERES VOLUME COUNT OPTIONAL 3 STANDBY INCREASE SET POINT HIGH CURRENT gt 70 DECREASE LOWCURRENT SET SYSTEM CYCLE STATUS AMPERES LED Digital Display Amperes Keypad Control Volume Count optional Set Point Amp Hours Set This display shows the present plating current Function Will display the number of liters of fixer replenishment used feature only works if current ring is installed Will display the set point calibration number Will display the current amp hours timer and then the units lifetime
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5. SP 107A8020 Cathode 05 139A9001D Bearing rulon 603027 Seal Bearing Kit consisting of 29 EVERY EFFORT HAS BEEN MADE TO INSURE THE COMPLETE ACCURACY OF THE CONTENTS OF THIS MANUAL NO LIABILITY ARISING FROM ITS USE HOWEVER CAN BE ACCEPTED BY THE COMPANY WHO RESERVES THE RIGHT WITHOUT PRIOR NOTICE TO ALTER THE SPECIFICATIONS CONSTRUCTION OR CONTENT OF ITS EQUIPMENT AT THE COMPANY S OWN DISCRETION 30 Statement of Warranty All equipment is manufactured to exacting standards and has been tested and inspected for proper workmanship and performance before shipping Any parts which are defective will be repaired or replaced within a one year period after date of shipment provided the equipment has been used according to the instruction manual and have not been abused or tampered with The company will not be responsible for any damage resulting from leakage of water or chemicals caused by improper installation operator carelessness or defective loose plumbing fittings associated with installation and operation of the equipment The company assumes no responsibility for damage in transit and the customer should resent any claim for such damage to the carrier This warranty gives you specific legal rights You may also have additional rights that vary from state to state Any unit to be repaired under warranty must be shipped freight prepaid or delivered to a facility authorized to render services provided hereunder
6. amp hours timer Pushing this key activates an indicator light Amperes Increase Decrease behind the key When the light is on the operator can make permanent changes to the set point and amperage settings Pushing once will display the high current amps and pushing again will display low current amps These keys are used to set the values of various system functions Status Lamps Control Function Operation Standby The unit is idle It will start Lamp is lit in STAND desilvering when the 15 minute BY mode only stand by timer expires High Current The unit is desilvering at the Lamp is lit in high high current setting current cycle and in sampling cycle after a high current cycle Low Current The unit is desilvering at Lamp is lit in low the low current setting current cycle and in sampling cycle after a low current cycle INSTALLATION AND SET UP General Comments 1 Remove the ARU from shipping container and check for signs of damage such as cracked tanks broken fittings etc Notify CPAC immediately if any damage exists Remove all packing materials including the packing between the cathode and anodes and save Position the system three to four feet from a grounded 120 VAC 2 Amp power source 230 VAC 1 Amp power source for export units Check the rating plate label for the voltage Drain provisions must be provided for the unit as well as other accessories used Connect the safety overflo
7. be used 7 Turn the unit ON Programming the ARU 1 ARU 700 ARU 1200 ARU 2100 The various ARU units are factory programmed as indicated in Table 1 below All of these parameters can be changed and other values reprogrammed into the unit TABLE 1 Factory Settings Fixer Replenishment Rate mL min 2 To reprogram the unit use the following keys Their functions are described below SET Press this key to enter the programming mode The display will go blank A light in the upper right corner of the key glows indicating that the microprocessor is in the SET mode and values can now be changed SET POINT Pressing this key will cause the set point to be displayed and flashed which indicates that it can be changed Change this setting by using the INCREASE or DECREASE key See the section on OPERATION for a detailed explanation of this setting AMPERES Pressing this key once will cause the high current setting to be displayed and flashed i e H 10 which indicates that it can be changed Change this setting by using the INCREASE or DECREASE key Pressing this key again will cause the low current setting to be displayed and flashed i e L 5 Change this setting by again using the INCREASE or DECREASE key In order to toggle back and forth between the two current settings continue to press this key The microprocessor will prevent the operator from programming the high and low current settings too close to each other i
8. count feature allows the user to program the fixer replenishment pump rate in ml min into the microprocessors memory and then utilize a current ring current sensing device to monitor the run time of the replenishment pump These two valves will be used to calculate the fixer replenishment volume or volume count The volume count measured in liters is a re settable counter which can be viewed on the display by pressing the VOLUME COUNT key In order to reset the volume count back to zero press and hold both the VOLUME COUNT and DECREASE keys until the 5 second reset timer on the display counts down to zero Program the fixer replenishment pump rate in ml min by first pressing the SET key to enter the programming mode Next press the VOLUME COUNT key and the current pump rate setting will be displayed and flashed Use the INCREASE or DECREASE keys to change the setting Finally press the SET key again to exit programming mode and store new setting in microprocessor s memory The optional current ring is clamped on one of the electrical wires to the fix replenishment pump It can be connected around either the hot or the neutral wire but only one wire goes through the ring of the current sensor Follow the unit schematic to connect the current ring signal wires if the current ring was not factory installed The current ring will send a low voltage signal to the PCB whenever the pump is on The replenisher pump must draw 5 amps for the curr
9. enters a standby cycle desilvering is halted for fifteen 15 minutes at the end of which it starts up again The first desilvering cycle after the unit is initially turned on and also after a standby cycle is in low current for 1 5 minutes instead of the normal 3 minutes This feature limits the amount of desilvering time if no silver laden fix is added for an extended period of time i e overnight or over the weekend The microprocessor will force a desilvering cycle into low current mode whenever the temporary AMP HOURS timer is below the value as indicated in Table 2 below This feature allows a bare cathode to buildup a solid base of silver and also eliminates the changes a bare cathode has on the setpoint calibration See the section on the AMP HOURS key for more details on utilizing this feature by resetting the temporary amp hours timer every time the cathode is desilvered TABLE 2 Minimum Value of Temporary Amp Hours Timer Model Amp Hours A hrs ARU 700 4 ARU 1200 6 ARU 2100 12 AMP HOURS Key The AMP HOURS key enables the operator to monitor the recovery rate of the unit There are two amp hours timer values that the microprocessor keeps stored in its memory The first is the temporary amp hours timer which is resettable and should be reset to zero every time the cathode is desilvered This will enable the operator to monitor how much silver has plated on the cathode assuming an average recovery efficiency and
10. will also enable the low current initial plating feature In order to reset the temporary amp hours timer press and hold down both the AMP HOURS and DECREASE keys until the 5 second reset timer on the display counts down to zero The value of the temporary amp hours timer can also be used to calculate the recovery efficiency of the unit This can be done by performing the following steps 1 Calculate the troy ounces or grams of silver plated at 100 efficiency by taking the number of temporary amp hours since the cathode was last desilvered and multiply by 0 128 multiply by 4 to calculate grams of silver plated 2 Weigh the troy ounces or grams of silver recovered from the cathode after desilvering 3 Divide the value in Step 2 by the value in Step 1 and then multiply by 100 to calculate the recovery efficiency percentage 96 4 If the recovery efficiency calculated in Step 3 is less than 80 the unit is operating too long in desilvering mode with no silver left in solution and indicates the set point is too high Lower the set point as described in the section Programming the ARU The second value the unit keeps track of is the permanent amp hours timer which is non resettable and therefore equals the number of amp hours during the lifetime of the unit Press and hold down the AMP HOURS key to view the value of the two timers The temporary amp hours timer is displayed for the first 4 seconds and the permanent amp hours ti
11. Returned unit must be either in its original package or a similar package affording an equal degree of protection All units must have a Material Return Authorization code MRA visible on the returned item MRA s can be obtained by calling 716 382 3223 31
12. be selected e If the value from Step 2 is greater than or equal to the value from Step the unit will go into STANDBY e the value from Step 2 is 6 more below the value from Step 3 the unit will plate in HIGH current e If the value from Step 2 is less than the value from Step 3 but is not 6 or more below the value from Step 3 the unit will plate in LOW current Change the set point setting in order to adjust the calibration point at which the recovery unit will switch plating cycles High Low and Standby The recommended increase or decrease in the set point at any one time is 1 or 2 10 or 20 mV and should be based on analysis of several samples recorded in Step 2 above Cell Voltage Measurement The cell voltage is constantly being measured by the PCB and can be viewed in millivolts on the display as long as both the INCREASE and DECREASE keys are pressed at the same time This feature is useful in determining whether the plating power supply is providing a DC voltage source to the recovery cell For extensive trouble shooting the cell voltage can be displayed without having to hold down the INCREASE and DECREASE keys by first pressing the SET key to enter the programming mode Next briefly press the INCREASE and DECREASE keys at the same time to display the cell voltage Press the SET key again to exit the programming mode and the display will return to showing the amperage Volume Count optional The volume
13. eap ye 8 TeordAL SALON NOIIVOIIddV 5855 4 25 086669 DNIMVUd NOLLV TIV LSNI NOLLVOITddvV 0017 ANVI 0 0Vd9a 0012 NAV SANTIS LSHLOLS 10 WOA S IdWVS LOXTIOO er 41117 Suou 9 8010 pue YUP c 2 9 JO pessooold Qop oz ovde 9 HSVM spunod 1 01 0 uo 1eA Is Jo purr smoy pz suo e3 8 Wdd 01 Wdd ye 1oA rs TeordAL SALON NOLIVOTDL Idd V 26 ARU 700 115 230 VAC 50 60 Hz SPARE PARTS LIST CPAC PART NO DESCRIPTION SP 124B8002 Cathode 05 139A9001D Bearing rulon 603027 Seal Bearing Kit consisting of 27 ARU 1200 115 230 VAC 50 60 Hz SPARE PARTS LIST CPAC PART NO DESCRIPTION p SP 107M0033 Cathode Coupling Kit consisting of 1 SP 107M0099 Motor Coupling Kit 1 SP 107M0033 Cathode Coupling Kit 1 50 114A9092A Load Washer 28 ARU 2100 115 230 VAC 50 60 Hz SPARE PARTS LIST CPAC PART NO DESCRIPTION 5
14. ent sensor to work correctly the pump does not draw this much current simply loop the electrical wire from the replenishment pump through the ring several times DESILVERING CATHODE General Comments Ideally wait until you have recovered approximately 6 to 10 pounds of silver on the SRU cathode 1 2 to 3 4 inch build up before stripping the silver To remove the silver follow these steps Desilvering Cathode by User 1 Equipment required a 1 2 inch wrench b putty knife approximately one inch wide c large plastic bag Optional Unplug unit Lift the top half of the unit power head and cathode straight up from the tank The silver laden cathode is attached to the bottom of the powerhead Set the top down on a flat surface preferably on a piece of plastic or in a shallow pan to catch fixer drips To remove cathode loosen the hex head bolt on the coupling with standard 1 2 wrench Power head will easily separate from silver laden cathode With a putty knife or similar tool scrape the silver from cathode Experience has shown that it may be cleaner and more convenient if you put the cathode in large plastic bag during scraping Reinstall the cathode by inserting it into the cathode coupling securely tighten the coupling bolt and replace power head on tank To insure proper and continuing operation check all hoses for possible leaks kinks and to be sure that outlet hose is in the appropriate drain to sew
15. er MAINTENANCE AND SERVICE BE DONE ONLY BY A QUALIFIED TECHNICIAN General Comments Unplug unit from wall power Remove housing cover by taking out two screws on each side of the cover Remove four screws in the corners of the large aluminum plate Remove cathode contact brush lead from shunt Lift entire electrical assembly straight up by pulling up on the motor You are now looking at the tank cover complete with the motor coupling contact brush spring and bracket This is a primary area of lost amperage Check the set screw holding the bronze motor coupler onto the cathode drive shaft Remove the motor coupler and the stainless steel cathode drive shaft Clean these parts thoroughly inside and out Inspect the plastic rulon bearing and the teflon seal Replace if worn Reassemble using a generous amount of grease between the rulon bearing and the teflon seal Make sure the stainless steel washer is installed between the bronze motor coupling and the flanged rulon bearing If this washer is not installed the flanged bearing will wear excessively When reassembling be sure the set screw is tight it must dig into the shaft Allow approximately 020 end play between the cathode drive shaft and bearing 020 thickness is approximately the thickness of a business card Refer to Drawing 699601 for a detailed drawing of assembly Clean the contact brush A small burr or particle can cut amperage substantially Rep
16. ials and components thus insuring many years of reliable trouble free operation Items Included in Shipping Container 1 Power head assembly including a plating power supply b motor drive c cathode drum d electrical cord e PCB with microprocessor and digital display f keypad controls Complete tank assembly including a factory installed fittings b drain tubing c tidy tray d four carbon anodes e anode cathode support Hook up kit a one PVC coupling 3 4 x 3 4 b one PVC reducer 3 4 x 1 2 10 of 3 4 tubing d hose clamps 2 Information kit a instruction manual and spare parts price list b silver test paper warranty registration card Automatic Terminal Electrolytic Silver Recovery The ARU silver recovery units are automatic They control and optimize plating current as the silver concentration varies in the fixer solution These units automatically increase plating current during peak periods to recover all the silver possible and reduce plating current during slow periods to reduce sulfiding The ARU units eliminate the need for separate timers fussy wiring into the film processor or worry about turning the unit OFF at night or weekends and ON again in the morning The microprocessor regularly samples the silver concentration of the fixer solution and automatically adjusts the plating current to match the working schedule and actual silver recovery needs Eff
17. icient Recovery Automatically Matched to Your Needs Since the ARU series automatically adjust their recovery rates to match silver production loss of precious silver to the drain is minimized These units do not require a timer thus avoiding problems caused by timer schedules being disrupted by power outages These units also avoid loss of silver if emergency film is processed during an period These units do not require separate probes or reference solutions thus avoiding frequent maintenance checks and solution calibration Terminal silver recovery units that use special probes often require frequent calibration with a reference solution or cleaning of a sensing probe and are often out of calibration resulting in loss of silver The ARU series use a simple and unique method of regularly measuring the silver concentration of the fixer solution The sensing system is completely self contained in this unit and does not use sensitive probes or reference solutions General Comments Recovery Capacity Plating Range Dimensions Tank Electrical Net Weight Shipping Weight Materials of Construction Installation SPECIFICATIONS ARU 700 ARU 1200 ARU 2100 ARU 700 ARU 1200 ARU 2100 ARU 700 1200 ARU 2100 ARU 700 1200 ARU 2100 0 83 Troy oz hr 25 8 grams hr 1 43 Troy oz hr 44 3 grams hr 2 5 Troy oz hr 77 5 grams hr 1 7 1 12 1 21 15 D x 15 W x 20 22 H 38cm x 38cm x
18. king restrictive kinks etc A qualified technician should check all electrical screw attached points for good conductivity such as the ground wire An especially important point to check is the set screws in the bronze motor coupling and cathode drive shaft to make sure they are tight SYMPTOMS Fixer leak or crystallizing around inlet outlet or drain fitting Fixer overflowing top of tank Motor not running and or all status LED s not lit Low or no cell current ERR 1 LO A flashing on display TROUBLE SHOOTING GUIDE POSSIBLE CAUSE Loose bulkhead fitting or tubing Cracked fitting The drain opening to sewer is higher than ARU outlet preventing solution from gravity feeding to sewer drain Outlet tubing has a kink or blockage Unit incorrectly installed and not getting power Blown fuse Unit not turned ON Cathode grossly overloaded with silver Capacitor burned out Motor burned out or gears malfunctioning Fixer corroded anode bracket Anode ground wire loose or not connected Anode carbon mount screws loose 20 PROBABLE SOLUTION Tighten fittings or tubing joints For very bad leaks remove and clean fittings After cleaning securely reinstall fittings to hold tank Replace fitting Put silver recovery unit on a stand so its drain outlet is higher than sewer drain opening Straighten tubing and or kink Check electrical source Investigate and remedy cause Replace fuse Turn p
19. lace the electrical assembly Reconnect cathode contact brush lead to current shunt and tighten nut securely Replace the four screws in the corners of aluminum plate Check all DC electrical connections These connections must be perfect clean and very tight Check hoses and bulkhead fittings to see that there are no leaks or restrictions Check lock washers anode bolts and nuts Remove any corroded washers Replace corroded bolts 10 Tighten all anode bolts 11 Check clean and tighten ground wire terminal connection at ground strap 12 Replace the power head and housing cover 13 Plug unit into the power outlet Turn unit ON 18 Preventive Maintenance The moving parts of the ARU units are designed and built so they do not need frequent lubrication The flanged sleeve bearing in the tank cover hub and the gear motor never need to be lubricated after they leave the factory Regular Cleaning and Inspection This is very IMPORTANT Keep the unit clean by using a rag dampened with Spic N Span or similar household cleaner Pay particular attention to cleaning the area of the anode brackets since these brackets will corrode if fixer comes in contact with them Corrosion can result in lower plating efficiency Visually check the status LED s and digital display to insure that the unit is working properly and the power is ON Yearly or when unit is moved from place to place check plumbing for signs of lea
20. mer is displayed thereafter If either timer exceeds 10 000 the value will be displayed exponentially The integer base will be displayed for 2 seconds and then the base 10 exponent i e 26 500 gt base display 2650 and exponent display E1 The base exponent is the number of zeros added to the end of the integer base to obtain the timer value Fail Safe Procedures Internally the microprocessor continually checks for mechanical and or electrical problems Any problem affecting the plating action will be detected The digital display will show ERR 1 if the unit cannot reach the programmed amperage The display will then show in sequence ERR 1 LO A This could be caused by the desilvering tank not filled too low silver content of the chemicals electrical connections not clean etc The message will continue to show until the problem is corrected When a problem such as a broken wire is corrected the desilvering cycle will begin where it left off SET POINT The set point is displayed as a range of to 60 factory default 30 Each increment is equal to 10 mV 0 300 mV 30 600 mV and 60 900 mV The ARU system actually works with two set points the set point that can be adjusted and displayed is the HIGH set point the LOW set point is automatically calculated to be 50 mV less than the HIGH set point Background Information There is a relationship between plating current and silver concentration in the electrolyte silve
21. more Too low a Setting will result in silver being lost to drain Generally the correct set point setting will plate silver on the cathode that is typically dark brown to light gray in color and granular in texture Changing the Set Point Setting The set point is a calibration number that determines how much silver is removed from the chemistry If the unit is not removing enough silver the set point should be raised If it is removing too much silver the set point should be lowered It is not practical to change the calibration during installation because the calibration will change after the cathode has an initial coating of silver Also the unit will plate the initial coating of silver in low current mode only so changing the set point during installation will have no effect until the minimum temporary amp hours value listed in Table 2 is reached It is recommended that the set point be left at the factory setting unless the plating is not satisfactory after the cathode has a coating of silver To make a change to the set point 1 Let the unit plate for several cycles as it is 2 Press the SET POINT and AMP HOURS keys The value shown on the digital display reflects the silver level from the last sample period Record this value 3 Press the SET POINT key The current set point will be displayed on the digital Record this value 4 The value from Step 3 is compared to the value from Step 2 to determine the plating mode that will
22. n order to ensure proper operation The two settings cannot be less than 3 amps apart for the ARU 700 5 amps apart for the ARU 1200 and 7 amps apart for the ARU 2100 When using the INCREASE or DECREASE key each time the arrow is pressed the value will change by one Holding down an arrow will change the value rapidly after an initial delay of about one second Use this rapid change to get near the aim value and then use individual pushes until the exact value is reached When all programming is complete press the SET key The light in the upper right corner of the key will go out and the new values entered into the microprocessor Note that it is not mandatory to make all the above changes before pressing this key New parameters can be entered into the system at any time by pressing the SET key OPERATIONS General Comments The ARU silver recovery unit follows a pattern of desilvering sampling and standby cycles in order to constantly monitor the silver concentration and adjust the current amperage accordingly The desilvering cycle lasts for three 3 minutes during which time the unit will be plating silver in either high or low current mode At the end of each desilvering cycle the unit enters a sampling cycle that lasts for 15 seconds At the end of the sampling cycle the microprocessor measures the cell voltage to determine whether the unit will start another desilvering cycle or enter a standby cycle If the ARU unit
23. nd the operating sequence of the controls WARNING NEVER ATTEMPT TO PERFORM ANY ELECTRICAL TROUBLESHOOTING ADJUSTMENT S OR SERVICE S UNLESS YOU ARE A QUALIFIED ELECTRICIAN ELECTRONICS TECHNICIAN OR FACTORY TRAINED SERVICE TECHNICIAN IMPORTANT SAFEGUARDS When using your ARU 700 ARU 1200 and ARU 2100 silver recovery systems these basic safety precautions should be followed 1 Read and understand all instructions 2 Care must be taken to avoid burns from touching hot parts 3 Do not operate this appliance with a damaged cord or if the appliance has been dropped or damaged until it has been examined by a qualified service technician 4 Do not let power cord hang over edge of table or counter or touch hot surfaces 5 An extension cord should not be used with this unit The unit should be plugged directly into a power outlet 6 To protect against electrical shock hazard do not immerse this appliance in water or other liquids 7 To avoid electrical shock hazard do not disassemble this appliance Call a qualified service technician when service or repair work is required Incorrect reassembly can cause electric shock hazard when the appliance is switched on SAVE THESE INSTRUCTIONS DESCRIPTION General Comments The ARU 700 ARU 1200 and ARU 2100 silver recovery units are designed to remove silver electrolytically from photographic fixer solution These compact efficient units are manufactured from the finest mater
24. ower supply ON Remove silver from cathode Replace capacitor Replace motor Replace anode ground bracket Connect Tighten SYMPTOMS Low or no cell current ERR 1 LO A flashing on display Sulphiding rotten egg smell coming from silver recovery unit Silver falling off cathode No silver collecting on cathode ON OFF switch ON no power POSSIBLE CAUSE Cathode not securely fastened to power head Set screw holding motor coupler to cathode coupling has loosened Cathode contact brush worn out Unit has been ON for too long a period of time All of the silver has been removed from fixer Recovery unit ON too long Recovery from bleach fix Cathode contaminated with grease and or oil Solution is not fixer No silver in fixer Blown fuse 21 PROBABLE SOLUTION Securely tighten cathode coupling screw to power head Tighten set screw in motor coupler Replace cathode contact brush Lower set point and or current settings Check electrical source Unit won t recover silver from bleach fix Clean cathode with clean cloth and scouring powder comet etc and water rinse thoroughly in water to remove contaminates Use silver laden fixer Use silver laden fixer Investigate and remedy cause replace fuse CD Tn 611 530044 QLLVAGHOS LINA 0001 01 serves 777 SMGINH Maw 5410 0 2945
25. r bearing fixer solution of the silver recovery unit When a large quantity of silver is present in the fixer there is less resistance between the anode and cathode which results in a lower plating voltage As the silver is removed from fixer more resistance occurs between the anode and a higher plating voltage will be required to maintain the plating current setting The ARU control PCB uses the anode and cathode as a sensor Every three minutes desilvering cycle the unit stops plating for fifteen seconds sampling cycle and measures its own cell voltage If the measured cell voltage is below the LOW set point the silver recovery unit will plate on the HIGH current setting When the cell voltage is equal to or above the LOW set point and below the HIGH set point the unit will plate on the LOW current setting If the cell voltage is equal to or above the HIGH set point the unit will cease plating and enter the standby cycle For example HIGH LOW Cell Voltage Measured Plating Set Point Set Point in Silver Recovery Unit Current 600 mV 30 550 mV 25 500 mV 20 High 600 mV 30 550 mV 25 550 mV 25 Low 600 mV 30 550 mV 25 600 mV 30 Standby Effects Higher set point settings will keep the unit operating on high plating current more and take silver concentration to a lower level Too high a setting will cause sulfiding Lower set point settings will give harder plate and keep the unit operating on low plating current
26. w hose to a drain Connect the silver bearing overflow hose from the processor s to either a solution collecting tank or directly to the ARU tank inlet CAUTION Use hose clamps on all connections to prevent leaks Connecting Unit to the Processor 3 Place the silver recovery unit in a convenient location within easy access to a drain and a 115 230 VAC grounded electrical supply Inspect all bulkhead fittings inlet outlet drain on ARU tank to insure tightness Securely attach ARU inlet tubing to the processor s fixer overflow connection CAUTION Severe bends and kinks in tubing will result in blockage of flow For your convenience a tubing hook up kit consisting of one PVC 3 4 x 3 4 coupling and one PVC 3 4 x 1 2 reducer has been provided 4 Place ARU outlet tubing in the nearest chemical resistant drain to the sewer In any event conform to prevailing local ordinances If the sewer drain is higher than the ARU outlet place the unit on a stand which elevates the outlet above the sewer drain Fill the ARU tank with silver laden fixer to the level of the outlet fitting ARU units are available as 115 or 230VAC Be sure the power supply matches the voltage requirement of the unit the voltage requirement is printed on the back of the powerhead Plug the ARU power cord into 115 230 VAC electrical outlet which is properly grounded Some processors have 115 230 VAC accessory electrical outlets which may

ARU-700

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