SYSTEM DESCRIPTION and INTENDED USE
Contents
1. Both of these procedures are found below ACCESS SYSTEM SETUP Ensure scale is level before proceeding To access all settings below break the Calibration Seal and open the right hand end cap Seal must be replaced by a certified technician Push the calibration switch right to the CAL position Figure 4 using the eraser end of a pencil or similar item Display arrow on the top right will light up CAUTION ESD The integrated circuits and semiconductors on the printed circuit boards may be damaged by electrostatic discharge Be sure to use proper handling precautions at all times SETTING GRAVITATIONAL ACCELERATION STEP 1 Select number 1 on the numeric keypad The 2 display arrow down on the right will light up STEP 2 The factory default setting will appear on the display Using the keypad enter in the local gravitational acceleration value 1f desired STEP 3 Press the ENTER button to save the selection or the CLEAR button to exit the menu without saving The display arrow will return to the 2 display arrow down on the right Figure 5 Calibration Switch STEP 4 Figure 5 Select another menu item or push the calibration switch left to the RUN position to exit CALIBRATION mode lt NET f f Y f f ELI 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 Copyright2. position to exit CALIBRATION mode AUTOMATIC SHUT OFF TIMER SETTING STEP 1 With the calibration switch is in the CAL position select number 3 on the numeric keypad The 3 display arrow down on the right will light up STEP 2 Repeatedly press number 3 on the numeric keypad to toggle selection for 60 seconds default 120 seconds 180 seconds or off STEP3 Press ENTER button to save the new value or CLEAR button to return to the menu without saving Default 60 seconds will remain in effect STEP 4 Select another menu item or push the calibration switch left to the RUN position to exit CALIBRATION mode Continued next page 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 2010 SR Instruments Inc Model SR775L Service Manual S N 1035 Part No MAN775L_100929 Page 14 of 16 DISPLAY UNIT OPTIONS SETTING STEP 1 With the calibration switch is in the CAL position select number 4 on the numeric keypad The 4 display arrow down on the left will light up STEP 2 Repeatedly press number 4 on the numeric keypad to toggle unit display selections as follows k KG LB factory default setting When selected both display symbols will light up g Weight readings will display in either pounds or kilograms Pressing the kg Ib
3. URL www srscales com email sri srinstruments com Copyright 2010 SR Instruments Inc Model SR775L Service Manual S N 1035 Part No MAN775L_100929 Page 9 of 16 BASIC SYSTEM OPERATION SETTING SYSTEM ZERO Before placing anything on the scale ensure it is level and press the ZERO button When the system starts up the display will quickly test all segments indicate the software revision level and the local gravitational constant All tare values will be erased and the scale will be in GROSS WEIGHT mode Display will zero When both the ZERO and STABILITY DETECTION display symbols are visible weighing can proceed Ambulatory patient can walk on the scale and the weight will appear on the display Non ambulatory patients should not be placed on the scale until tare is set for any equipment needed by the patient 1 e wheelchair chair walker etc Refer to SETTING TARE WEIGH When the system has been set to zero the WEIGH button can be used after the patient is positioned on the scale Lock the patient s wheelchair brake to prevent movement The display will indicate the patient S weight After Automatic Shut Off simply press the WEIGH button to re activate the scale CAUTION Do not leave patient unattended on the scale platform SETTING TARE Place the empty wheelchair chair walker with any blankets or pillows that the patient may have with them on the scale platform ES oi Wi TH i aer tiom n
4. 2010 SR Instruments Inc Model SR775L Service Manual S N 1035 Part No MAN775L_ 100929 Page 13 of 16 CALIBRATION cont d CALIBRATION PROCEDURE Note Ensure scale is level and make sure that nothing is in contact with the scale during this procedure Remove hands from scale when noting displayed calibration results STEP 1 Press number 2 on the numeric keypad The 2 display arrow down on the right will light up System is now in 2m ve LOD EUERE H Tes mode to set Calibration Gravitational Acceleration EM If value is already correct press the ENTER button to save and continue with calibration STEP 2 Using the keypad enter in the local gravitational acceleration value if desired STEP 3 Press ENTER button to save and continue with calibration The 4 display arrow down on the right will light up l STEP 4 Press ZERO button to set the display to zero The ZERO and STABILITY DETECTION display symbols will light up At that time place calibrated weight s onto the scale It is recommended that the full 280 kilograms be used for calibration STEP 5 Using the numeric keypad enter the value of the total calibrated weight placed on the scale STEP 6 Press the ENTER button to save the selection or the CLEAR button to exit the menu without saving The top right display arrow will light up STEP 7 Select another menu item or push the calibration switch left to the RUN
5. E YU ILE AREE EE AEAEE 10 THEORY OF OPERATION ieiizssisiteWceivere dietis E E E a ERN REESE To 2e UUE a EUH 11 CAEIDRENTION A Gain EHE a cct EDS E e DUREE esta EL VUE PU Me EXE IINUEE 12 VARRANT P 15 TABLE OF FIGURES I3eure 15 56208 ASSCDIDIVN ni tosarbo videi DR EIEE iE ENEE EENKEER EO EE viri ru Do ELE ESTEAN ste beL t 4 Emure 2 Battery Compartiment COVER ic sascscusccissesacases zecaseresescancsnuccssscssccnscstncesbresecssgnseuneatstusesoaens 4 larg 3 Button Display TNR UU ra Era R ASN EET raai 8 Fic re 4 Battery migsiisi me 10 PIeure 5 CAME AGU OM SWIEODGa 9 1 0597919551220 0465020825 542222805201 8941920 E 5422 0 050 29 089 090 08 0098 12 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 2010 SR Instruments Inc Model SR775L Service Manual S N 1035 Part No MAN775L_100929 Page 3 of 16 PACKING CHECKLIST SR775L Wheelchair Scale System V DESCRIPTION Qty MAST ASSEMBLY lea BASE ASSEMBLY lea NYLON INSERT LOCK NUTS 4ea PACKAGE OF SIX 6 D CELL BATTERIES 6ea QUALITY CONTROL CHECKLIST lea CALIBRATION CERTIFICATE lea MODEL SR775L MANUAL lea 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 2010 SR Instruments Inc Model SR775L Service Manua
6. Model SR775L Service Manual S N 1035 Part No MAN775L_100929 Page 1 of 16 SRScaleg by SR Instruments Inc Model SR775L Wheelchair Scale System Operating and Service Manual Serial Numbers 1035 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 2010 SR Instruments Inc Model SR775L Service Manual S N 1035 Part No MAN775L_100929 Page 2 of 16 TABLE OF CONTENTS TABLE OFFICORE c 2 PACKINGCHECKLEST 7 75L aac rracswacde ta nen aE OANE NEEE NENEA EREKE ESEKAN 3 ASS DUI Be fe M 4 SYSTEM DESCRIPTION AND INTENDED USE ssisssisisisssisssssssisisssssissssosos sssssiosssossss sssoiisssse 5 IVAN SEIN IN INI CLEANING 22699 102060400505 9808 2009000019039 003003090 01900 O 0010090001063 90 08 Pedo reir see reis 5 STORAGE AND TRANSPORTA TION uiinnistssseeendessdveseseesveves a EE aiaia 6 SEPECHUCATIONS 1095699279 39014 2 194910 05 1009 000 02000 00000000902 4000 00000000 01 08800 90 0 90 20 0 020 0505908 7 BUTTONOPUNGLEIONS 22 222491120120 90 933 2 12 30 0622 34 000 210 01 EEE EE FEE LI EeTE EUR EET EOL E eo EE 8 BASIC SYSTEM OPERATION u9iscieisivcruiva Ou Pu aai eaidil Dira dad 9 DISPLAY ERRORCODES aniio ibiec eti Piet oder icem eria pied ode I edd Ris 10 BATTERY REPLACEMENT 3509 030299 609333 FiS ER 0IUSI E
7. S CODE DEFINITION RESOLUTION Excessively large or small gravitational constant is stored during calibration Err 2 ey a or m ud Re calibrate using a known calibrated weight Scale is stored during calibration Use a known gravitational constant for the location of the scale Battery resource 1s critically low Batteries must be Batteries must be replaced Remove any weight that may be on the scale Pata input to electronics too high y a y ensure that the scale is level and re zero Data input to electronics too low Check the Display Assembly Cable Connection BATTERY REPLACEMENT STEP 1 When the batteries are low and need to be replaced the rg rary LOW BATTERY display symbol will light up on the display J BG J STEP 2 Gently position the scale system on its side to access the I lt 63 Nou IES b gt Battery Compartment STEP 3 Figure 4 Unscrew the two screws holding the Battery Compartment Cover in place STEP 4 Open the Cover and remove and replace ALL of the batteries at the same time Replace with six 6 D cell batteries following the instruction on the Battery Compartment Cover STEP 5 Check to make sure the display is working correctly by pressing T TTE i Figure 4 Battery the ZERO or WEIGH button to activate the display screen Compartment STEP 6 Close the Battery Compartment Cover and securely screw into place STEP 7 Gently return the scal
8. al display The micro controller performs a rolling average of data for continuous weigh and then micro controller averages the data before locking in on the reading The micro controller can be placed in a calibration mode where the system can be re calibrated In the calibration mode the calibration local gravitational constant and duration of on time can be adjusted The new factors are stored in non volatile memory 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 2010 SR Instruments Inc Model SR775L Service Manual S N 1035 Part No MAN775L_ 100929 Page 12 of 16 CALIBRATION IMPORTANT CALIBRATION CHECK A certified technician should perform this procedure The load cell and integrated electronics have no user serviceable components and should not be tampered with for any reason Re calibration must be performed when the seal is broken Recommendation for calibration check is at least once every 12 months or as individual maintenance policy requires INITIAL SYSTEM SETUP When initially set up calibration is factory set and re calibration is not needed The Local Gravitational Acceleration may have to be re set for the current geographical location Automatic Shut Off is shipped with a factory default of 60 seconds If a longer period of time 120 or 180 seconds is desired then it will need to be re set
9. ated merchandise will not be accepted for credit 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 Noreturns 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 2010 SR Instruments Inc Model SR775L Service Manual S N 1035 Part No MAN775L_ 100929 Page 16 of 16 SRScales By SR Instruments 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 2010 SR Instruments Inc
10. button Ib toggles between display units at any time during the weigh process KG LB only When selected the Ib display symbol will light Weight readings will display ID in pounds only The kg lb button is deactivated kg KG only When selected the kg display symbol will light Weight readings will display Ilo in kilograms only The kg Ib button is deactivated 0 STEP 3 Press ENTER button to save the new value or CLEAR button to return to the menu without saving Default will remain in effect STEP 4 Select another menu item or push the calibration switch left to the RUN position to exit CALIBRATION mode 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 2010 SR Instruments Inc Model SR775L Service Manual S N 1035 Part No MAN775L_ 100929 Page 15 of 16 WARRANTY FOUR YEAR LIMITED WARRANTY Each SRScalles system is manufactured with high quality components SR Instruments Inc warrants that all new equipment 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 destruction are not covered by this warranty Warranty service must be performed by the factory or an authorized repair stati
11. e to an upright level position on the floor Figure 2 Battery Compartment Cover 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 2010 SR Instruments Inc Model SR775L Service Manual S N 1035 Part No MAN775L_100929 Page 5 of 16 SYSTEM DESCRIPTION and INTENDED USE SYSTEM DESCRIPTION The SR775L Scale System employs the latest in microprocessor and load cell technology to provide precise and repeatable weight data The low power microprocessor circuitry derives its power from batteries that will provide up to 400 hours of weight readings before needing replacement This eliminates the need for an external battery charger or the danger of a plug in power supply The SR775L also incorporates a keypad tare which allows the caregiver to preset a pre determined tare value that can represent the weight of the wheelchair walker chair etc to be used when weighing the patient This amount will be automatically subtracted from the gross weight of patient and equipment so only the net weight of the patient will be displayed and stored in memory The scale comes equipped with dual side ramps to facilitate access when using wheelchair bound patients When not in use or when moving the scale the dual ramps are folded up and onto the scale surface INTENDED USE The SR775L is designed for use as a portable patient wei
12. e to the upright level position 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 2010 SR Instruments Inc Model SR775L Service Manual S N 1035 Part No MAN775L_ 100929 Page 11 of 16 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 1s 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 Wheatstone 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 Wheatstone bridge The output of the Wheatstone bridge is digitized by a sigma delta analog to digital converter The data is transferred to the micro controller 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 and then displays the result on the liquid cryst
13. ghing system for ambulatory and non ambulatory wheelchair bound patients or those that need to be supported by a chair or walker Maximum weight M ME PII OF capacity must not exceed 1000 pounds or 454 1000 LB 454 KG kilograms gross weight WARNING MAINTENANCE and CLEANING Exercise caution when cleaning the display window of the SR775L as it is made of WARNING clear polyester and can be scratched by abrasive cleaners It is recommended to use DO NOT use pressurized water or steam The mild soap and water for general cleaning Scale system contains microprocessor circuitry and disinfecting DO NOT use vinegar to and strain gauge sensors that may be adversely clean the display affected by exposure to such an environment 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 2010 SR Instruments Inc Model SR775L Service Manual S N 1035 Part No MAN775L_100929 Page 6 of 16 STORAGE and TRANSPORTATION STORAGE If storing this equipment for extended periods or longer than three 3 months remove the batteries 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 10 C to 50 C TRANSPORTATION To transport the SR775L tilt the scale back and roll on the built in wheels to ano
14. l S N 1035 Part No MAN775L_100929 Page 4 of 16 ASSEMBLY STEP 1 Unpack the scale system and check parts PART NAME against the PACKING CHECKLIST If there are Display Assembly any missing or damaged parts call the local sales Mast Assembly representative Base Assembly STEP 2 Verify that the serial number on the Display 4 Ramps Assembly 1 and the Base Assembly 3 match Flat Socket Head Cap Screws 4 IMPORTANT All of the scale systems are calibrated 6 Battery Compartment Cover at the factory as a complete system Components Display Assembly Cable Connector should not be interchanged with other systems STEP 3 Figure 1 Place the Mast 4 Assembly 2 onto the Base Assembly as 0 l shown Note Be sure to put Display Assembly Cable Connector 7 through corresponding hole in Base Assembly V4 STEP 4 Insert the four 3 8 Flats Socket 2 Head Cap Screws 5 provided to attach the Mast Assembly to the Base Assembly STEP 5 Gently position the scale system on its side Loosen the battery compartment cover screws to open the Battery Compartment Cover 6 Figure 2 Figure 1 Scale Assembly STEP 6 Plug the Display Assembly Cable Connector 7 into its mate in the battery compartment STEP 7 Insert the six 6 D cell batteries following directions on the Battery Compartment Cover Close and securely screw the Battery Compartment Cover into place STEPS Gently return scal
15. o fi Lu Ix Press the ZERO button to tare the object s weight The display lt am TT TH mt id i will read 0 0 Remove the wheelchair from the platform Place L the patient in the wheelchair Place the wheelchair on the platform Lock the patient s wheelchair brake to prevent movement Press the WEIGH button to display the patient s weight When tare is known for an object the amount can be pre set via the keypad Press the ENTER button to activate the keypad and display any pre set tare data residing in memory Enter the numeric value of the weight of the current tare object For example 12 5 kilograms will be entered as 125 decimal remains fixed Press the ENTER button again to save the data The PRE SET TARE and NET WEIGHT display symbols will light on the display The pre set tare value will be indicated as a negative number until the patient is positioned on the scale The CLEAR button or an Automatic Shut Off will cancel the pre set operation if the ENTER button has not already saved tare to memory The WEIGH button will re activate the scale after Automatic Shut Off without compromising the tare data 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 2010 SR Instruments Inc Model SR775L Service Manual S N 1035 Part No MAN775L_ 100929 Page 10 of 16 DISPLAY ERROR CODE
16. on 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 parts that have been so returned and are disclosed to SR Instruments Inc s satisfaction to be defective The provisions of this warranty clause are in lieu of all other warranties expressed or implied and of all other obligations or liabilities on SR Instruments Inc s part and it neither assumes nor authorizes any other person to assume for SR Instruments Inc any other 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 outd
17. ther location Gently return the scale system to an upright level position 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 2010 SR Instruments Inc Model SR775L Service Manual S N 1035 Part No MAN775L_100929 Page 7 of 16 SPECIFICATIONS MAXIMUM WEIGHT CAPACITY 1000 Ib or 454 kg PLATFORM SIZE 28 in x 28 in DISPLAY TYPE 1 in LCD display screen DISPLAY RESOLUTION 0 1 1b 0 1 kg ACCURACY 0 1 1 digit reading over 200 g AUTO ZERO One button operation Pre programmable TARE value to allow patient s net SEA EA AE weight to be viewed AUTOMATIC SHUT OFF Programmable to OFF 60 120 180 seconds AVERAGING Automatic digital filter Six 6 D cell batteries POWER SUPPLY Low battery indicator on Display Normal operating conditions for this product Ambient Temperature Range 5 C to 35 C Relative Humidity Range 0 to 85 non condensing Avoid exposure to high pressure water or steam OPERATING CONDITIONS Storage and transport conditions should not vary outside the following conditions Relative Humidity 0 to 85 Ambient Temperature 10 C to 50 C Remove batteries if storing for an extended period of time TRANSPORT and STORAGE SR Instruments Inc 600 Young Street Tonawanda NY 14150 Tel 716 693 5977 Fax 716 693 5854 URL www srscales com email sri srinstr
18. uments com Copyright 2010 SR Instruments Inc Model SR775L Service Manual S N 1035 Part No MAN775L_100929 Page 8 of 16 BUTTON FUNCTIONS ao Will recall the last stored weight pig Aher dingleny sharks cr rra Will activale keypad Enter tare value Fress button again io Save Cue will cancel ihe keypad operation and any pre set tare value not stored Figure 3 Button Display 0 The ZERO button activates scale display and sets the system to zero When the system is turned on the display lights all segments on the LCD shows the software revision level and the local gravitational constant Scale will be in GROSS WEIGHT mode and display will zero LB KG MODE Ib The LB KG button factory default setting allows user to toggle between viewing data in ko pounds or kilograms Alternative options can display pounds only or kilograms only deactivating the LB KG button WEIGH The WEIGH button starts the scale and displays the patient s weight The display lights all segments on LCD shows the software revision level and the local gravitational constant and starts up in the same mode NET or GROSS it was in prior to Automatic Shut Off Tare data will not be compromised HOLD Pi The SET TARE button stores the weight of object prior to that object and patient being placed together on the scale SR Instruments Inc 600 Young Street Tonawanda NY 14150 Tel 716 693 5977 Fax 716 693 5854
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