SR241 Manual - SR Instruments, Inc.
Contents
1. sri srinstruments com Copyright 2015 SR Instruments Inc Model SR241 Portable Infant Adult Scale Service Manual Part No MAN241_151110 Page 11 of 14 THEORY OF OPERATION SR Instruments patient weighing systems are digital scales Strain gauge force cells convert the force of an applied weight into an analog signal This signal is amplified by an operational amplifier and converted to a digital signal by an analog to digital converter The digital signal is transferred to a micro controller where it is filtered converted to appropriate units and displayed on a liquid crystal display Strain gauge force cells each contain four strain gauges mounted in a full Whetstone bridge configuration These bridges convert the physical movement of the force cell due to the applied mass on the system into minute changes in electrical resistance These changes in resistance produce a voltage difference across the Whetstone bridge which is amplified by the operational amplifier The amplifier is configured to current sum the output of each cell with potentiometers serving to adjust the sensitivity voltage out per unit of weight applied of each bridge The offset potentiometer produces a small current which nulls the output of the amplifier for an unloaded system The output of the operational amplifier is digitized by the analog to digital converter The converter integrates the analog signal onto the integrating capacitor over a short interval The i2. 151110 Page 9 of 14 BASIC SYSTEM OPERATION ADULT WEIGH STEP 1 Remove infant cradle from base Place scale on hard smooth floor surface to ensure accurate data STEP 2 Press the large blue ZERO button and wait for the display to indicate 0 0 Hy ZERO Ug STEP 3 Position patient on the platform Weight will be displayed in a few seconds STEP 4 To recall last weight data press the LB or KG buttons Note Must be done before ZERO button is pressed STEP 5 If more weight needs to be added at any time during the weighing process add weight and press the blue ADULT WEIGH button This will update the net weight on the display BABY WEIGH OPTION 1 STEP 1 If necessary attach the baby cradle by sliding and snapping it into place STEP 2 Place the platform on a stable counter or table top STEP 3 Follow the directions for ZERO BABY MODE in the previous section STEP 4 When the display indicates 0 0 you may place the baby on the scale If the display shuts down before weight data can be noted press the LB or KG button to recall the last stored weight data BABY WEIGH OPTION 2 STEP 1 Remove infant cradle from base Place scale on hard smooth floor surface to ensure accurate data STEP 2 Have an adult stand on the scale holding any accessories that will be necessary for the baby s comfort blanket diaper etc Press the yellow BABY ZERO button This wil
3. ACEMEN ac ccteessccrcecc avecsessuasceccntescesseuaseeccsaueoessoussecsastsetesstussesaascsaveussuisesensss 10 THEORY OF OPERATION isso a Satscp es castes edad creas ches dederseeccaecsnsiederssactate NACE EARE 11 CALIBRATION ace cscs raat ceca ete E texteestsnstucssetteusiesseuas tustaetuessucistasiasesisssaetsts 12 TROUBEESHOOTIN G aig reece E EEE EEEE 12 WARRANTY aaa scueseics ntcccesseuenensecbesassscuaveiss cteasuveesesersucluesavacwaneusictesaevecseasass 13 TABLE OF FIGURES Figure 1 Optional Soit Sided Carry Case sisssiisccsstsnsvesiscesecssssnevcsstievcsstensvesdsenseassvenevesetecsvesstensicis 5 FICUre 2 SRA VSRAISO Lael sssesicccccxsesincscsvecediveversesesietncsbesdensisaiecndsbatevasieatesscsterdencseaveestitetcaas 8 Figure 3 SR241 SR241SO Battery Compartment ccccccscsssccsccssssssssssssssscssssscccccsccssssees 10 SR Instruments Inc 600 Young Street Tonawanda NY 14150 Tel 716 693 5977 Fax 716 693 5854 URL www srscales com email sri srinstruments com Copyright 2015 SR Instruments Inc Model SR241 Portable Infant Adult Scale Service Manual Part No MAN241_151110 Page 3 of 14 PACKING CHECKLIST Model SR241 Portable Infant Adult Scale DESCRIPTION QUANTITY SCALE BASE l ea INFANT CRADLE lea 9 VOLT BATTERY lea CERTIFICATE OF CALIBRATION ea MANUAL lea OPTIONAL ITEMS IF ORDERED SOFT SIDED CARRY CASE lea PACKING CHECKLIST Model SR241SO Portable Scale DESCRIPTION QUANTITY
4. Model SR241 Portable Infant Adult Scale Service Manual Part No MAN241_151110 Page 1 of 14 SR Scales by SR Instruments Inc Model SR241 SR241SO Portable Infant Adult Scale Operating and Service Manual SR Instruments Inc 600 Young Street Tonawanda NY 14150 Tel 716 693 5977 Fax 716 693 5854 URL www srscales com email sri srinstruments com Copyright 2015 SR Instruments Inc Model SR241 Portable Infant Adult Scale Service Manual Part No MAN241_ 151110 Page 2 of 14 TABLE OF CONTENTS TABEF OF TIGURES ss cea tics sce feces EEEE EEEE ESEN AAE EEE EO EESE 2 PACKING CHECKLIST MODEL SR24 Lcrresesreno seroren n aneen E raa o ENa 3 PACKING CHECKLIST MODEL SR24150 sseeosecssssssoocccccccsssoococccessssosooccececssssososeecessssssssse 3 ASSL MBE Y srira EEEE E EEE A EEEE 4 REPLACEMENT PARTS AND ACCESSORIES eseeesssssscccccccsessssccccccesessoococcccessssssococcessssssosose 4 SYSTEM DESCRIPTION AND INTENDED USE ssscccccoccccccccescsssesssososccoscccccceceessesssssssssssssee 5 MAINTENANCE AND C LEANING wacicuncceaccessnetecsssesiatoteveiecenistuccesssetectiiesiasetevelecsnnstuccesvaeiuctessbusts 6 STORAGE AND TRANSPORTATION sssseeeeeesssssssccccecesessscoccccesesssococccesesssoscssccessssssssssecesssesssssse 6 CEG ATID oeira S NE EEE 7 BOCIONTONC TIONS o E E S 8 PAE SY OVE OP EA ON aos ence ecs tagcess censasvontecseeacentanvestecteousedsssecagnssesstansatvestacessseetestseasaseucs 9 BATTERY KEEL
5. SR Instruments Inc 600 Young Street Tonawanda NY 14150 Tel 716 693 5977 Fax 716 693 5854 URL www srscales com email sri srinstruments com Copyright 2015 SR Instruments Inc Model SR241 Portable Infant Adult Scale Service Manual Part No MAN241_151110 Page 4 of 14 ASSEMBLY STEP 1 Unpack the scale system and check parts against the PACKING CHECKLIST If there are any missing or damaged parts call the Service Hotline at 1 800 654 6360 STEP 2 Insert the 9 volt battery See BATTERY REPLACEMENT instructions STEP 3 SR241 scale system Infant Cradle slides onto the Scale Base and snaps securely into position REPLACEMENT PARTS and ACCESSORIES SM4028 REPLACEMENT INFANT CRADLE SR241SO SCALE ONLY MAN 241 MANUAL PP 4022 SOFT SIDED CARRY CASE SR Instruments Inc 600 Young Street Tonawanda NY 14150 Tel 716 693 5977 Fax 716 693 5854 URL www srscales com email sri srinstruments com Copyright 2015 SR Instruments Inc Model SR241 Portable Infant Adult Scale Service Manual Part No MAN241_151110 Page 5 of 14 SYSTEM DESCRIPTION and INTENDED USE SYSTEM DESCRIPTION The SR241 SR241SO Portable Infant Adult Scale employs the latest in microprocessor and load cell technology to provide accurate and repeatable weight data Four 4 identically matched transducers are strategically placed to ensure an accurate representation of the patient s weight The patient s weight is displayed on an LCD screen With a
6. iceable components and should not be tampered with for any reason Re calibration is generally not required but should be verified periodically to ensure accuracy The recommendation for calibration check is at least once every 12 months or as individual maintenance policy requires TROUBLESHOOTING SYMPTOM REASON CORRECTIVE ACTION System fails to perform correctly Check battery Make sure patient is standing on two feet is clear of any obstacles and that nothing including the caregiver is touching the patient or scale Set scale on smooth hard floor surface Scale reads 999 9 Return to factory for repair For additional information or assistance phone our Service Hotline 1 800 654 6360 or e mail sri srinstruments com SR Instruments Inc 600 Young Street Tonawanda NY 14150 Tel 716 693 5977 Fax 716 693 5854 URL www srscales com email sri srinstruments com Copyright 2015 SR Instruments Inc Model SR241 Portable Infant Adult Scale Service Manual Part No MAN241_151110 Page 13 of 14 WARRANTY FOUR YEAR LIMITED WARRANTY Each SRScalles system is manufactured with high quality components SR Instruments Inc warrants that all new equipment purchased will be free from defects in material or workmanship under normal use and service for a period of four 4 years from the date of purchase by the original purchaser Normal wear and tear injury by natural forces user neglect and purposeful destructi
7. l zero the scale system and TARE the adult s and additional accessories weight STEP 3 Place the baby in the adult s arms The weight displayed will be the infant s net weight STEP 4 To recall last weight data press the LB or KG buttons Note Must be done before ZERO button is pressed STEP 5 If more weight needs to be added at any time during the weighing process add weight and press the yellow BABY WEIGH button This will update the net weight on the display SR Instruments Inc 600 Young Street Tonawanda NY 14150 Tel 716 693 5977 Fax 716 693 5854 URL www srscales com email sri srinstruments com Copyright 2015 SR Instruments Inc Model SR241 Portable Infant Adult Scale Service Manual Part No MAN241_151110 Page 10 of 14 BATTERY REPLACEMENT REPLACING BATTERIES The display will read LobAt when battery is low and needs to be changed STEP 1 Figure 3 Turn the scale over and locate the battery cover Unscrew the two 2 screws STEP 2 Remove and replace with a 9 volt battery STEP 3 Press the ZERO button to confirm display is working l s z lt 3 Qa gt eS oe ADULT MODE STEP 4 Replace cover and securely tighten screws STEP 5 Zero the system Figure 3 SR241 SR241SO Battery Compartment SR Instruments Inc 600 Young Street Tonawanda NY 14150 Tel 716 693 5977 Fax 716 693 5854 URL www srscales com email
8. ngs Please heed the following warning to avoid injury to the patient or attendant WARNING DO NOT EXCEED MAXIMUM WEIGHT LIMIT OF 400 LB 181 KG SR Instruments Inc 600 Young Street Tonawanda NY 14150 Tel 716 693 5977 Fax 716 693 5854 URL www srscales com email sri srinstruments com Copyright 2015 SR Instruments Inc Model SR241 Portable Infant Adult Scale Service Manual Part No MAN241_151110 Page 6 of 14 MAINTENANCE and CLEANING Exercise caution when cleaning the display window as it is made of clear polyester and can be scratched by abrasive cleaners Mild soap and water is recommended for general cleaning and disinfecting WARNING DO NOT use pressurized water or steam The scale system contains microprocessor circuitry and strain gauge sensors that may be adversely affected by exposure to such an environment STORAGE and TRANSPORTATION STORAGE If storing this equipment for periods longer than three 3 months remove the battery To maintain proper operation of this instrumentation storage and transport conditions should not vary outside the following conditions Relative Humidity 0 to 85 Ambient Temperature 14 F to 122 F 10 C to 50 C TRANSPORTATION WARNING Prolonged exposure to extremes of heat or cold can damage equipment and effect accuracy SR Instruments Inc 600 Young Street Tonawanda NY 14150 Tel 716 693 5977 Fax 716 693 5854 URL www srscales com email s
9. ntegrating capacitor is then discharged at a rate proportional to the reference voltage applied to the converter The residual voltage on the integrating capacitor is then multiplied by a factor and again discharged at a rate proportional to the reference voltage The residual voltage from this discharge is again multiplied by a factor and again discharged The time taken to discharge the capacitor 1s proportional to the voltage from the operational amplifier which is proportional to the applied load on the force cells The time is stored as a binary number in the analog to digital converter and is transferred to the micro controller when the conversion is complete The micro controller averages and filters the digital output of the analog to digital converter subtracts the value saved during the system zero operation and scales the filtered output then displays the result on the liquid crystal display The micro controller performs a rolling average of data for continuous weigh and averages the data before locking in on the reading SR Instruments Inc 600 Young Street Tonawanda NY 14150 Tel 716 693 5977 Fax 716 693 5854 URL www srscales com email sri srinstruments com Copyright 2015 SR Instruments Inc Model SR241 Portable Infant Adult Scale Service Manual Part No MAN241_ 151110 Page 12 of 14 CALIBRATION IMPORTANT CALIBRATION CHECK Qualified service personnel only should perform this procedure Load cells have no user serv
10. on are not covered by this warranty The factory or an authorized repair station must perform warranty service Service provided on equipment returned to the factory or authorized repair station includes labor to replace defective parts Goods returned must be shipped with transportation and or broker charges prepaid SR Instruments Inc s obligation is limited to replacement of part which has been so returned and is disclosed to SR Instruments Inc s satisfaction to be defective The provision of this warranty clause is in lieu of all other warranties expressed or implied and of all other obligations or liabilities in connection with the sale of said articles In no event shall SR Instruments Inc be liable for any subsequent or special damages Any misuse improper installation or tampering shall void this warranty DAMAGED SHIPMENTS Title passes to purchaser upon delivery to Transportation Company Any claims for shortage or damage should be filed with the delivery carrier by purchaser RETURN POLICY All products being returned to SR Instruments Inc require a Return Goods Authorization number RGA To receive an RGA call our Technical Service Team at 716 693 5977 or toll free in the USA and Canada at 800 654 6360 When inquiry is made please supply model and serial numbers purchase order if the scale was bought on contract and reason for return Generally deleted damaged and outdated merchandise will not be accepted for c
11. push of a button weight data may be viewed in either pounds or kilograms with a displayed resolution of 0 1 Ib or 0 1 kg INTENDED USE The SR241 Portable Infant Adult Scale is a unique portable scale system that offers the versatility of being able to weigh infants toddlers and adults on one lightweight and weather resistant system Weighing in itself at a mere seven pounds this scale is specialized for use in pediatrician or physicians offices and is also perfect for traveling nurse applications The optional Soft Sided Carry Case Figure 1 protects the scale and facilitates its portability Figure 1 Optional Soft Sided The SR241 Portable Infant Adult Scale is a preferred means of gathering Carry Case patient weight data of adults weighing up to 400 pounds 181 kilograms and infants to 44 pounds 20 kilograms Load cell technology ensures accurate and repeatable weight readings The SR241SO Portable Adult Scale is a unique portable scale system that is lightweight and weather resistant It weighs a mere four pounds This scale is specialized for use in physicians offices and is also perfect for traveling nurse applications The optional Soft Sided Carry Case Figure 1 protects the scale and facilitates its portability The SR241SO Portable Adult Scale is a preferred means of gathering patient weight data of patients weighing up to 400 pounds 181 kilograms Load cell technology ensures accurate and repeatable weight readi
12. redit A minimum restocking charge of 15 will be assessed on return of current merchandise All returns are to be shipped FREIGHT PREPAID to SR Instruments Inc 600 Young Street Tonawanda NY 14150 RESTOCKING FEE e 15 fee for any scale that has been opened and used e 10 fee for any scale returned that has been ordered incorrectly or refused delivery with no model change e 5 fee if an error in ordering has been made and a different model exchanged e No fees will be charged if the scale is returned because of an error on the part of SR Instruments Inc e No returns accepted after 60 days SR Instruments Inc 600 Young Street Tonawanda NY 14150 Tel 716 693 5977 Fax 716 693 5854 URL www srscales com email sri srinstruments com Copyright 2015 SR Instruments Inc Model SR241 Portable Infant Adult Scale Service Manual Part No MAN241_151110 Page 14 of 14 SR Scales By SRInstruments Inc Precision amp Technology in Perfect Balance SR Instruments Inc 600 Young Street Tonawanda NY 14150 Tel 716 693 5977 Fax 716 693 5854 URL www srscales com email sri srinstruments com Copyright 2015 SR Instruments Inc
13. ri srinstruments com Copyright 2015 SR Instruments Inc Model SR241 Portable Infant Adult Scale Service Manual Part No MAN241_ 151110 Page 7 of 14 SPECIFICATIONS MAXIMUM WEIGHT CAPACITY Infant 44 lb 20 kg Adult 400 lb 181 kg Infant Cradle 22 in x 12 5 in 55 cm x 32 cm PSAE Nero Adult Platform 12 in x 14 in 31 cm x 36 cm DISPLAY TYPE LCD Infant 1 4 oz 0 01 kg DISPLAY RESOLUTION Adult 0 1 1b 0 1 kg ACCURACY 0 2 1 digit of displayed resolution over 0 2 kg AUTO ZERO One button operation SR241 SCALE WEIGHT 7 b 3 kg SR241SO SCALE WEIGHT 4 lb 2 kg AUTO POWER DOWN After 1 minute AVERAGING Automatic digital filter POWER SUPPLY 9 volt battery CALIBRATION Calibration is traceable to NIST standards Normal operating conditions for this product Ambient Temperature Range 68 F to 85 F 20 C to 30 C Relative Humidity Range 0 to 85 Avoid exposure to high pressure water or steam OPERATING CONDITIONS Storage conditions should not vary outside the following TRANSPORATION AND conditions Relative Humidity 0 to 85 Ambient STORAGE Temperature 14 F to 122 F 10 C to 50 C Remove batteries 1f storing longer than three 3 months SR Instruments Inc 600 Young Street Tonawanda NY 14150 Tel 716 693 5977 Fax 716 693 5854 URL www srscales com email sri srinstruments com Copyright 2015 SR Instruments Inc Model SR241 Portable Infant Adul
14. t Scale Service Manual Part No MAN241_ 151110 Page 8 of 14 BUTTON FUNCTIONS SRSaNS t rIo ms i ASO Figure 2 SR241 SR241SO Label SYSTEM ZERO ZERO ADULT MODE To zero for adult weigh Press the large blue ZERO button Display will 7 read 0 0 When patient is placed onto the scale net weight will be displayed ZERO BABY MODE To zero for infant weigh Slide and snap the cradle into place on the scale Place any blankets pads or disposable liners being used for infant s comfort on the cradle before zeroing Press the yellow BABY MODE button to zero the scale system When baby is placed on the scale the infant s net weight data will be displayed Note When system is zeroed memory is emptied LB KG MODE BUTTONS Press either button to switch weight display between pounds ounces or kilograms during the baby weighing process and press either button to switch the weight display between pounds or kilograms during the adult weighing process Pressing either button after weigh process is finished and display has shut down re activates display and recalls last weight reading This must be done before system is zeroed SR Instruments Inc 600 Young Street Tonawanda NY 14150 Tel 716 693 5977 Fax 716 693 5854 URL www srscales com email sri srinstruments com Copyright 2015 SR Instruments Inc Model SR241 Portable Infant Adult Scale Service Manual Part No MAN241_
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