BLOOD COLLECTION MIXER
Contents
1. ets sec continues activated when 20 minutes passed after the start of collection Very rapid beeps four beeps a second continue Tube clamp closes Check needling and phlebotomy site to ensure flow is adequate To continue collection press CLAMP button to open the clamp To end collection press END button Remark Certain version of the blood collection mixer doesn t have 10 and 20 minutes alarms and or tray removal alarm 20 CM73522UMC 0112 5 4 Recharging the Battery The battery pack can be recharged in two ways It can be recharged in the mixer unit or with the battery charger unit included Recharging the battery pack while still in equipment 1 Plug the AC power adaptor into the jack on the rear panel of the main unit 2 Plug the AC cord plug into a wall outlet 3 Leave plugged in for several hours Battery will take about 10 hours to fully recharge from a low voltage indicator Battery 1s recharged even if equipment power switch is in OFF position Recharging the battery pack with the battery charger unit 1 Plug the AC power adaptor into the jack on the battery charger unit 2 Plug the AC cord plug into a wall outlet 3 Put the battery pack in the charger unit The charging indicator lamp will be lit Battery pack doesn t have polarity Any direction of installation will be good 4 Leave plugged in for several hours Battery will take about 10 hours to2. main display is now showing total weight loaded on the tray in grams The figure in Section 3 5 Tube Clamp Module 1 Tube Clamp presses blood bag tubing to stop blood flow This clamp is opened and closed by CLAMP switch except at the end of a normal collection The END switch must be pressed to indicate completion of the collection cycle then CLAMP switch is enabled to work The clamp is automatically opened when the START switch is pressed to start collection It is automatically closed at the end of collection or when the END switch is pressed 2 Guide Pins keep the blood bag tubing in proper position 3 Connection Plug is a circular connector 4 Screws should be removed to move the module to the other side 14 CM73522UMC 0112 The figure in Section 3 6 Battery Charger and Adaptor 1 Battery Charger Unit is a power supply source to recharge the battery pack The Output Plug 5 of the AC Power Adaptor 4 is plugged in the Adaptor Inlet 2 3 Charging Indicator Lamp is on during recharging If the battery is removed from the charger unit the lamp will be off 4 AC Power Adaptor converts the AC main line voltage to 18 VDC output 15 CM73522UMC 0112 5 How to Use Equipment 5 1 1 2 3 4 5 6 Preparation before Use Open carrying bag and unpack mixer tray battery and AC adaptor Insert battery pack into the compartment and close the door To operate the eq
3. x 20 3 W x 14 H cm Weight Equipment with battery 3 2 Kg 7 0 lbs Temperature characteristics Operating 0 40 C 32 104 F Storage 20 70 C 4 158 F Note 1 These figures may vary upon user s request 2 Certain version doesn t have 10 amp 20 minutes and or tray removal alarms 3 A power adaptor of 110 120 VAC input is available as necessary 6 CM73522UMC 0112 3 Views and Locations 3 1 Top View CM73522UMC 0112 7 E SA I L GENESTS Blood Collection Mixer Q 1 2 3 4 5 6 7 8 9 10 b Control Panel LCD Display Panel Power Switch Tube Clamp Module now mounted at left side Tray Handle Weight Calibration Hole Tray Leveling Screw Clamp Module Connection Hole LED lamp 3 2 Rear View Vf mA A HH FOR CONTINUED PROTECTION AGAINST THE BLOOD CORED TION MIKER CAUTION RISK OF ELECTRIC SHOCK AND OR FIRE ADAPTER MODEL CM 735 a TO REDUCE THE RISK OF ELECTRIC HAZARD USE ONLY WTH POWER SUPPLY IN pi INPUT REGHARGEABLE BATTERY PACK SHOCK DO NOT REMOVE COVER ADAPTER MODEL D571801000U0 EVER GLOW NI CAD 12VDC 2AH MODEL BN 122C REFER SERVICING TO QUALIFIED OR POWER SUPPL ADAPTER MODEL SERVICE PERSONNEL D571801090UD INPUT 120VAC 60HZ 4 DOUBLE INSULATION WHEN S2W UPUT ANOR 1
4. 000A SERVICING USE ONLY IDENTICAL SERIAL NO REPLACEMENT PARTS USTED 8221 DANGER LR 103941 MEDICAL EQUIPMENT EXPLOSION RISK IF USED WTH Centron Tachnalogias Corporation FLAMMABLE ANESTHETICS DISTRIBUTED BY NATIONAL HOSPITAL SPECIALTIES HACKENSACK NJ D7801 O 800 344 5087 20134881174 Ey 1 Battery Pack 2 Battery Compartment Door 3 Power Adaptor Inlet 4 Tray 5 Tray Mount 6 Handle 7 Tube Clamp Module CM73522UMC 0112 3 3 Control Panel RIST PRESET ec BLEED J58ses TARGET VOLUME TIME T_ l START CLAMP END CM73522UMC 0112 1 2 3 4 5 6 7 8 START Switch END Switch TIME Switch CLAMP Switch LCD Display Panel UP Switch DOWN Switch PRESET Switch L 3 4 LCD Display Panel OO Sa 2 O 56 CM73522UMC 0112 1 3 4 5 6 7 8 9 Main Display Volume Weight Preset Target Volume Display Low Battery Indicator ALARM Indicator TIME Indicator BLEED Indicator END Indicator ML Indicator GRAM Indicator 3 5 Tube Clamp Module ee mpare TTT 1 Tube Clamp 2 Guide Pin 3 Connection Plug 4 Mounting Screws 11 CM73522UMC 0112 3 6 Battery Charger and Adaptor 1 Battery Charger Unit 2 Adaptor Inlet 3 Charging Ind
5. USER S MANUAL BLOOD COLLECTION MIXER Model CM735 No CAT CM73522Ce Centron Technologies Corporation 319 25 Sadang 4 dong Dongjak ku Seoul Korea 156 823 Tel 82 2 522 7807 Fax 82 2 522 7806 Table of Contents Important Notes 1 Scope 1 1 Features 1 2 Accessories 2 Specifications 3 Views and Locations 3 1 Top View 3 2 Rear View 3 3 Control Panel 3 4 LCD Display Panel 3 5 Tube Clamp Module 3 6 Battery Charger and Adaptor 4 Functional Descriptions 5 How to Use Equipment 5 1 Preparation before Use 5 2 Operating Procedures 5 3 Audible Alarm Signals 5 4 Recharging the Battery 5 5 Moving the Clamp Module 6 Maintenance 6 1 Troubleshooting 6 2 Calibration 6 3 Leveling the Tray 6 4 Service Call CM73522UMC 0112 Page 16 16 17 19 21 23 24 24 25 26 27 Important Notes Power Source The Blood Collection Mixer model CM735 is operated by either a battery pack or an AC power adaptor Caution Do not put excessive weight on or push the tray downward in a forceful manner This avoids damage to the weight sensitive device under the tray Do not place weights over 2 Kg on the tray Battery Capacity Turn power switch off to save the battery when the machine is not to be used for hours If a machine with a fully charged battery pack is left in but unused the battery will be exhausted in about 15 20 hours A machine with a fully charged battery can operat
6. e continuously for approximately 8 hours Battery Recharging A low voltage symbol flashes on the display panel and an alarm will sound when the battery voltage gets low To recharge the battery just plug the AC power adaptor in the rear panel jack or take out battery and put it on the battery charger unit Cleaning Instructions Use a soft cloth and mild detergent to clean the equipment DO NOT use paint thinner benzene solvent or strong detergent Keeping Avoid using or leaving the machine in a location where the temperature is higher than 122 F 50 C Keep it away from any heating source or direct sunlight CM73522UMC 0112 1 Scope 1 1 Features e The Blood Collection Mixer CM735 provides efficient mixing of the blood with the anticoagulant in the blood bags e It is a lightweight mobile unit with maximum portability e The panel display indicates the net volume of blood collected in the blood bag It automatically closes the tube clamp when the collected volume reaches the preset selected figure The display shows the total weight on the tray at the end of the donation and elapsed collection time e Various audible and visual alarms are provided to ensure accurate and safe collection and mixing The mixing motion is controlled by a microcomputer When the blood collection is started the tray rocks for 3 cycles and pauses for 2 seconds then resumes rocking As the collection approaches the preset donation amount
7. e longer than 30 cm Refer to Note 3 in Section 5 2 25 CM73522UMC 0112 6 3 Leveling the Tray Tray leveling is ensured by a magnetic position sensor and precision mechanism After long use for years the tray might become unlevel Leveling of the tray can be simply adjusted by users 1 Prepare a flat tip screwdriver 3 5 mm 1 8 3 16 in diameter 2 Turn power off and remove tray from tray mount 5 in the figure in Section 3 2 3 Identify the tray leveling screw 8 in the figure in Section 3 1 through the hole 4 Turn the screw clockwise by about a half turn 180 degrees to make the tray rotate clockwise The tray will rotate clockwise by a half degree Turn the screw counter clockwise by about a half turn 180 degrees to make the tray rotate counter clockwise The tray will rotate CCW by a half degree 5 Replace the tray and turn power on 6 Check tray leveling If tray is not level repeat from 2 to 5 again 26 CM73522UMC 0112 6 2 Service Call If the equipment does not operate properly or if you need assistance contact your distributor or the manufacturer 27 CM73522UMC 0112
8. esn t work ask service for the clamp module If it works ask service for all Beeps sound Care needed Refer to Sec 5 3 Measurement is out of tolerance Short tubing between clamp and blood bag Give more tubing length Refer to Note 3 in Sec 5 2 Out of calibration Make calibration as per Sec 6 2 Tray is unlevel Sensing point moved Make adjustment as per Sec 6 3 Other problems should be corrected by authorized service personnel Contact your distributor for service CM73522UMC 0112 24 6 2 Calibration Designed tolerance of weight measurement is 1 gram For example if a standard weight of 500 grams is put on the tray the display should show a figure between 499 and 501 Otherwise the equipment may be subject to calibration by users Checking accuracy of weight measurement 1 Prepare a known weight of about 500 grams 2 Turn power on and after 30 seconds stand by put the weight on tray Do not touch the equipment and table during count down 3 If the display is out of the known weight 1 follow the procedures below Calibrating the equipment for weighing accuracy 1 Prepare a small size flat tip screwdriver 2 3 mm 1 16 1 8 in diameter 2 Turn power off and remove the tray 3 Remove the hole plug and locate a screw in the top panel 7 in Section 3 1 4 If the measured figure was smaller than the known weight t
9. fully recharge from a low voltage indicator 5 Unplug the AC cord plug and disconnect battery from charger unit after 10 hours 21 CM73522UMC 0112 Note 1 Recharging a battery for more than 10 hours is not harmful to the battery or any circuit Note 2 The expected lifetime of a rechargeable battery is about 6 months to 2 years If operation time is apparently reduced or if nothing is displayed on the LCD panel when the power switch is turned on the battery pack may be worn out or have permanent damage Replace with a new battery pack Contact your distributor for spare battery packs Note 3 A multi unit battery charger model BC162 is available for purchase The features of BC162 charger are Six battery packs are recharged same time One bay gives fast charging so one pack can be recharged in about 3 hours The other five bays give standard charging which takes 10 hours One bay of this battery charger can be converted to make discharging by intentionally activating a push button switch This feature is to be used to refresh the battery pack by clearing built up memory in the pack 22 CM73522UMC 0112 5 5 Moving the Clamp Module The tube clamp module is detachable and users can change its mounting place either to the left or to the right side of the mixer 1 Turn power switch off 2 Remove the three screws 1 and pull out the clamp module 2 3 Remove the two screws on the side panel 3 and t
10. he one screw 4 4 Install the clamp module with three screws 5 Assemble the side panel and screws 23 CM73522UMC 0112 6 Maintenance 6 1 Troubleshooting User maintenance is limited to battery charging cleaning calibration and tray leveling The following table covers common problems and suggested solutions Symptom Likely Cause Solution Power switch is on but Exhausted battery Recharge battery as per Sec 5 4 no display comes on es Damaged battery Refer to Note 2 in Sec 5 4 Equipment malfunction Ask service Call your distributor Low battery indicator flashes Exhausted battery Recharge battery as per Sec 5 4 A battery pack doesn t support 8 hours operation Damaged or worn out battery Recharge the battery again Refer to Note 2 in Sec 5 4 Power adaptor doesn t work Bad power adaptor Check it by plugging it in main unit and then in charger unit Ask service for the power adaptor Charging indicator lamp is not lit when battery is installed in the charger unit for recharging Bad battery contact due to dirt or corrosion or battery charger adaptor may be bad Inspect and clean any dirt or corrosion at contacts on battery pack and springs on charger unit Ask service as required Clamp doesn t work but main unit works good Bad tube clamp module Move the clamp module to the other side as per Sec 5 5 and check again If it do
11. hen the adaptor is plugged in it supplies power to the equipment and the battery pack will be recharged 4 Tray is detachable At the bottom of the tray attached is a magnetic pad which sticks to the metal Tray Mount 5 The figure in Section 3 3 Control Panel 1 START Switch starts collection process Tray starts rocking clamp is opened main display shows collected blood volume in ML 2 END Switch completes collection process and returns machine to initial state Tray stops rocking main display shows total weight on the tray in GRAM 3 TIME Switch When depressed it displays elapsed time of the collection Time memory is cleared by pressing START switch to begin next collection 4 CLAMP Switch opens and closes tube clamp This switch does not work at the end of a normal collection until END switch is pressed 5 LCD Display Panel shows all figures and symbols Refer to the Section 3 4 for details 13 CM73522UMC 0112 6 UP Switch increases the preset target volume by 5 ml each time pressed 7 DOWN Switch decreases the preset target volume by 5 ml each time pressed 8 PRESET Switch recalls one of the numbers that were factory set If the preset numbers are 450 and 500 ml the target volume displayed toggles as 500 450 500 450 each time this switch is pressed Power on default figure is 500 These preset numbers and default figure may be changed upon user s reques
12. icator Lamp 4 AC Power Adaptor 5 Output Plug 6 AC Cord Plug 12 CM73522UMC 0112 4 Functional Descriptions The figure in Section 3 1 Top View 1 Control Panel has seven control switches and an LCD display panel 2 LCD Display Panel is a custom designed display panel on which all information is shown 3 Power Switch turns the power on and off 4 Tube Clamp Module is detachable it can be mounted at either the left or right side of the tray A screwdriver is necessary to move the module 5 Tray is plastic molded on which blood collection bags are loaded Tray should be detached when mixer is stored in the carrying transportation case 6 Handle is retractable 7 Weight Calibration Hole In this hole is an adjustment screw to calibrate weight and volume as necessary 8 Tray Leveling Screw makes the tray rotate 9 Clamp Module Connection Hole is used when user wants to install the tube clamp module at the right side 10 LED Lamp is illuminated when the power switch is on The LED lamp starts flashing when collection volume reaches the preset volume at the end of normal collection process The figure in Section 3 2 Rear View 1 Battery Pack is rechargeable and replaceable Nickel Cadmium 12 VDC 2 AH 2 Battery Compartment Door is opened by placing a finger in the hole and pushing the door plate down 3 Power Adaptor Inlet takes power directly from the AC power adaptor W
13. lamp and remove blood bags B Slow bleed Di 2 A BB Bi 58 59 60 61 62 63 64 65 66 sec continues activated when blood flow is slower than 30 ml minute Refer to Section 5 2 Note 7 Five short beeps once a second half second long each 1 minute interval Check needling and phlebotomy site to ensure flow is adequate To continue collection do not press any button DO NOT press END button as it will clear the volume previously collected Remove the reason of slow bleed To end collection press END button C Low battery activated when battery is exhausted Refer to Section 5 4 One very long beep 5 second long only once Recharge the battery or connect the AC power adaptor 19 CM73522UMC 0112 D Tray removal O 1 2 9 405 E AA sec continues activated when the tray is removed Beeps sound twice a second until power is turned off Turn the power switch off E 10 minutes passed ANNAN DANNA NANA 0123456789 101112 sec activated when 10 minutes passed after the start of collection 20 rapid beeps twice a second only once for 10 seconds Check needling and phlebotomy site to ensure flow is adequate To continue collection do not press any button DO NOT press END button as it will clear the volume previously collected To end collection press END button F 20 minutes passed Oris A E AE E atec
14. mber displayed is net volume of blood collected in blood collection bag represented in milliliters Note 4 Weight of blood bags and anti coagulant and any weights put on tray are tared when START is pressed All tared weights must remain on the tray until the collection cycle ends If any weights are removed blood volume will have an error of an equal amount Note 5 Do not touch the tray or blood collection bags during the collection If the tray is pushed down sensed weight may exceed the preset target volume then the clamp will close When this happens press CLAMP button to re open the clamp and continue collection DO NOT press END button as it will clear the volume previously collected Note 6 When the collected blood volume reaches 20 ml below the preset target volume the tray stops rocking until the preset target volume is reached This process assures accurate collection with a 1 2 ml tolerance For example if the target volume is set at 500 ml the tray stops rocking at 480 ml and resumes rocking when the tubing is clamped at 500ml 17 CM73522UMC 0112 Note 7 If blood flow rate is slow lower than 30 ml per minute and remains low for 1 minute audible beeps will sound and the ALARM indicator will be activated Check donor phlebotomy site to ensure blood flow is adequate The beep will repeat once every minute until the flow is higher than 30 ml per minute When the collected volume reaches the pre
15. otal weight display 0 999 grams with 1 gram increments Elapsed time display 0 19 min 59 sec Target volume set 1 Range 0 995 ml with 5 ml steps 2 Set method up down and preset buttons 3 Preset values fe 350 400 450 500 ml 4 Default value P 450 ml Alarms 1 Low battery voltage audible visual alarms at low battery voltage 2 Low flow rate audible visual alarms at 30 ml min or lower 3 Tray removal audible visual alarms at tray removal 4 Long collection time beeps at 10 and 20 minutes after start Tray moving 1 Speed 60 RPM speed nominal with 12 5 degrees 2 Motion mode 3 cycles moving 2 seconds pause Accuracy 1 Weight calibration tolerance 1 gram 2 Decimal truncation error 1 gram ml sec maximum 3 Clamp closing time delay error 1 gram maximum 4 Collection volume accuracy 0 ml to 3 ml 5 Total weight accuracy 0 gram to 3 grams 6 Time display accuracy 1 second maximum Controls POWER START END TIME CLAMP PRESET UP DOWN Indication panel custom designed composite LCD display Operating power source 12 volts DC battery pack or AC power adaptor Battery pack Nickel Cadmium rechargeable 12 Volts DC 2AH Power adaptor 220 240 VAC 50 60 Hz In 18 VDC 1 Ampere Out Battery charging by built in charging circuit or by separate charger unit Power consumption 2 watts maximum Dimensions Equipment 11 5 L x 8 0 W x 5 5 H inches 29 2 L
16. rger one pack among 6 is recharged fast in 3 hours and other 5 packs in 10 hours It takes about 10 hours to recharge a pack from exhausted level to fully charged level A fully charged battery will operate the mixer continuously for approximately 8 hours The blood collection mixer unit can also be powered directly by using the AC power adaptor When both a battery pack and a power adaptor are connected at the same time the power adaptor supplies operating power and the battery is under recharging The tube clamp module can be positioned on either the left side or the right side of the tray It can easily be remounted on either side of the tray by the user The equipment is stored in a soft carrying bag and weighs less than 4 kilograms When the power switch is turned on the machine requires 30 seconds to stabilize weight sensing circuits During this time the display shows a 30 second count down The Blood Collection Mixer is a unit designed with solid state electronics and advanced technology CM73522UMC 0112 1 2 Accessories included with each unit The Blood Collection Mixer CM735 includes the items shown below Quantity 1 each Collection Mixer Base Collection Weighing Tray Battery Pack Battery Charger Unit AC Power Adaptor And Carrying Transportation Case User s Manual CM73522UMC 0112 2 pos AN ei oie be ol Specifications Collection volume display 0 999 ml with 1 ml increments T
17. set target volume the collection ends The tube clamp closes The tray resumes rocking LED lamp starts flashing The END indicator appears to show that the collection is finished The ML indicator remains on to show the main display indicates the net volume of blood in milliliters Beeps sound The beeps will repeat once every 30 seconds until END button is pressed The CLAMP button will not work until END button is pressed 7 Press END button The tray stops rocking The LED lamp stops flashing and remains lit The GRAM indicator appears again to indicate the number displayed is total weight loaded on the tray represented in grams Note 8 Depressing TIME button displays donation draw time on main display 8 Crimp blood bag tubing and remove phlebotomy needle from the donor 9 Press CLAMP button to open clamp and remove blood bags 18 CM73522UMC 0112 5 3 Audible Alarm Signals Different audible alarms are generated by a buzzer to indicate that the attention of the phlebotomist is required A End of normal collection O 1 2 3 4 5 06 7 E 28 29 30 31 32 33 34 35 36 sec continues activated when collection ends normally Follow Section 5 2 7 Three long beeps 1 second long each each 30 second interval Press END button Beeps stop and LED lamp stops flashing Crimp blood bag tubing and remove phlebotomy needle Press CLAMP button to open c
18. t The figure in Section 3 4 LCD Display Panel 1 Main Display displays either total weight blood volume or elapsed time ML GRAM or TIME is displayed to indicate what is being displayed 2 Preset Target Volume Display has three digits This figure is controlled by UP DOWN or PRESET switch 3 Low Battery Indicator is illuminated when battery requires recharging Beep tone sounds when this symbol is first activated 4 ALARM indicator is illuminated when an abnormal condition occurs such as a slow draw Refer to the Section 5 3 for details 5 TIME indicator is illuminated only when the TIME switch is depressed The main display shows the elapsed time in min sec 6 BLEED indicator is illuminated while blood collection is in progress When the START button is depressed this indicator is on and ML is on too This indicator goes off and GRAM is on when the END button is depressed 7 END indicator is illuminated when the collection is completed When the collected volume reaches the preset target volume this indicator is illuminated The tube clamp closes and beeps sound The front LED lamp also flashes 8 ML indicator is illuminated when the START button is depressed It means the main display is now showing net volume of blood collected in the blood bag in milliliters 9 GRAM indicator is illuminated when the machine is not in collection process It means the
19. the tray stops rocking to ensure an accurate donation When the preset amount is reached the clamp closes and tray resumes rocking The Blood Collection Mixer monitors blood flow rate during the collection and donation draw time When the draw is less than 30 ml minutes the machine will alarm The alarm is both audible and visual The alarm repeats every 60 seconds if blood flow remains low The LCD panel displays pertinent information The following information can be viewed on the LCD total weight gram of blood and blood bags collected volume ml of blood target volume to collect ml elapsed time min sec low battery voltage condition unit of displayed figure ml or gram alarming condition The unit can be powered by either a battery pack or an AC power adaptor A Nickel Cadmium battery pack of 12 Volts 2AH capacity is used It is replaceable and rechargeable An audible alarm sounds when battery voltage drops to its lower limit The battery can be recharged while in the mixer or with a separate battery charger unit The battery can be recharged while the mixer is in use if the AC power adaptor is attached at rear panel jack of main unit The battery can also be recharged by removing it from the mixer and connecting it to a separate battery charger unit CM73522UMC 0112 A large battery charger model BC162 which charges 6 battery packs same time is available for purchase from your distributor With this cha
20. uipment by AC power plug the AC power adaptor in the inlet on the rear panel Note 1 When both the battery and the AC power adaptor are connected together the adaptor supplies operating power and the battery is under recharging Put the tray onto tray mount Empty the tray then turn power on The tray rocks once LED lamp is lit LCD panel displays 29 or 28 then it counts down to 0 Note 2 If anything is put on the tray when power is turned on it is tared at zero count Tared weights must remain on the tray throughout the procedures If any weight is removed total weight will have an error of an equal amount Wait for 30 seconds until main display registers 0 GRAM appears to indicate the number displayed is weight in grams Equipment is now ready to use 16 CM73522UMC 0112 5 2 Operating Procedures 1 Set target collection volume with the PRESET UP DOWN buttons 2 Place blood collection bag on tray 3 Route blood collection bag tubing through tube clamp Note 3 The tubing length from the clamping point to the blood bag should not be shorter than 30 centimeters 1 ft to ensure proper rocking movement 4 Press CLAMP button to close tube clamp 5 Prepare phlebotomy site and stick donor 6 Press START button Tube clamp is opened and the blood begins to flow into blood bag Tray starts rocking BLEED indicator is on ML appears to indicate the nu
21. urn the screw clockwise CW by about 1 8 of a turn 45 degrees If the measured figure was bigger than the known weight turn the screw counter clockwise CCW by about 1 8 of a turn 45 degrees Turning it CW will increase displayed figure and CCW will decrease display 5 Install the tray and follow the accuracy check procedures above 6 If the equipment is still out of tolerance repeat from 2 to 5 again If the equipment is now in tolerance replace the hole plug Note 1 The calibration screw is a potentiometer working very sensitive Do not turn the screw more than a quarter turn at one cycle of calibration The screw adjustment should be done while the power switch is being turned off Note 2 Designed tolerance of blood volume measurement of the net collected blood in blood bag is 0 to 3 milliliters For example if the preset target volume is set at 500 it s normal that the net collected blood volume comes between 500 503 ml But there exist two factors that may change the result 1 The equipment measures weight only Blood volume is calculated from blood weight divided by specific gravity of blood If the specific gravity of a donor s blood is different from the set figure it will result some error about 1 2 ml 2 If the tubing length between clamping point and blood bag is changed or if it is not free it may push or lift the tray more or less To minimize this type of error the tube length should b
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