background image

Model SR755KG Series Wheelchair Scale 
Operating and Service Manual - S/N 1913+ 
Part No.:  MAN755KG_100929 

 

Page 9 of 16 

 

Model SR755KG Series Wheelchair Scale 
Operating and Service Manual - S/N 1913+ 
Part No.:  MAN755KG_100929 

 

Page 9 of 16 

 

S

Instruments, Inc.

600 Young Street, Tonawanda, NY  14150 

Tel:  716-693-5977     Fax:  716-693-5854    URL:  

www.srscales.com

S

Instruments, Inc.

600 Young Street, Tonawanda, NY  14150 

Tel:  716-693-5977     Fax:  716-693-5854    URL:  

www.srscales.com

 

email:  

[email protected]

     

  

Copyright 2010

 

S

Instruments, Inc. 

 

email:  

[email protected]

     

  

Copyright 2010

 

S

Instruments, Inc. 

BASIC SYSTEM OPERATION cont’d 

 
STEP 1

:  Place the empty wheelchair (with any blankets or pillows that the patient may have 

with them) on the scale platform.  Then press the zero button.   

NOTE

The display will shut off after 35 seconds. The zero (TARE) will still be stored 

in memory.   

STEP 2

:  Remove the wheelchair from the platform.  Place the patient in the wheelchair.   

STEP 3

:  Wheel the patient with wheelchair onto the platform.  Lock the patient’s wheelchair 

brake to prevent movement. Press the weigh button.  The display will show the patient’s weight 
only.   
 
 
 
 

 

CONTINUOUS WEIGH

 

In this default mode, the weighing surface remains active.  Press the “

HOLD

” button once to lock 

the displayed reading and store it in memory as the “last weight” for recall later if needed. 

AUTO-HOLD

 

This mode is for patients unable to remain still for the weighing procedure.  It locks, stores, and 
displays the patient’s weight as soon as the “

WEIGH

” button is pressed once.  

Note

: No weight 

will be displayed until the button is pressed.   

To enable this mode, BEFORE zeroing the system, press and hold the “

HOLD

” button for 

approximately five (5) seconds until the display reads “

AUTO-HOLD ENABLED

”. 

To return to CONTINUOUS WEIGH mode when finished, press and hold the “

HOLD

” button for 

approximately five (5) seconds until the display reads “

CONTINUOUS WEIGH

”. 

BATTERY REPLACEMENT 

 

STEP 1

:  The display will read “

REPLACE BATTERY

”.  

STEP 2

:  (Figure 5)  Place the scale on its side and open the Battery Compartment

 

cover located 

in the bottom of the scale between the wheels.  

STEP 3

:  Remove and replace ALL six 

(6) “D” cell batteries.  Refer to diagram on 
the Battery Compartment cover for 
placement.   

STEP 4

: Press 

the 

WEIGH

” button to 

confirm display is working. 

STEP 5

:  Tightly close the cover.  

STEP 6

:  Zero the system.  

 

Figure 5:  Battery Compartment 

CAUTION 

 

Do not leave patient unattended on the scale platform. 

Summary of Contents for SR755KG

Page 1: ...KG_100929 Page 1 of 16 SInstruments 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 SInstruments Inc by S Instruments Inc Operating and Service Manual Serial Numbers 1913 Model SR755KG Wheelchair Scale ...

Page 2: ...SSORIES 5 SYSTEM DESCRIPTION AND INTENDED USE 5 MAINTENANCE AND CLEANING 6 STORAGE AND TRANSPORTATION 6 SPECIFICATIONS 7 BUTTON FUNCTIONS 8 BASIC SYSTEM OPERATION 8 BATTERY REPLACEMENT 9 THEORY OF OPERATION 10 CALIBRATION 11 INITIALIZATION 12 TROUBLESHOOTING 13 WARRANTY 14 NOTES 15 TABLE OF FIGURES Figure 1 Assembly Diagram 4 Figure 2 Location of Mast Pipe Set Screws and Display Cable Connection 4...

Page 3: ...n x 28 in 1 ea MAST PIPES 2 ea DISPLAY UNIT with CABLE 1 ea PACKAGE OF FOUR 4 LEVELING FEET 1 ea PACKAGE OF SIX 6 D CELL BATTERIES 1 ea LOCTITE 1 ea 1 8 ALLEN WRENCH 1 ea QC INSPECTION SHEET 1 ea CALIBRATION CERTIFICATE 1 ea WARRANTY CARD 1 ea MANUAL 1 ea DESCRIPTION QUANTITY BASE ASSEMBLY SR755LKG 71 cm x 71 cm 28 in x 28 in 1 ea MAST PIPES 2 ea DISPLAY UNIT with CABLE 1 ea PACKAGE OF FOUR 4 LEVE...

Page 4: ... of Loctite STEP 4 Position the Mast Pipes into the Base Assembly as shown while feeding the display cable through the left hole STEP 5 Figure 2 Gently rest the scale on its side and open the Battery Compartment Cover 4 located in the Base Assembly between the wheels Make sure the Mast Pipes are seated against the bottom stops and securely tighten the Mast Pipe Set Screws 5 using a small amount of...

Page 5: ... DESCRIPTION and INTENDED USE SYSTEM DESCRIPTION The SR755KG Wheelchair Scale System 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 low power microprocessor circuitry allows the SR755KG to derive its power fro...

Page 6: ...teel pipes 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 STORAGE and TRANSPORTATION STORAGE If storing this equipment for periods longer than three 3 months remove the batteries To maintain proper operation of this instrumentation storage and trans...

Page 7: ... ZERO One button operation AUTO POWER DOWN After 35 seconds HOLD Stores displayed reading in memory LAST WEIGHT RECALL Hold button recalls last stored displayed reading AVERAGING Automatic digital filter POWER SUPPLY Six 6 D cell batteries Low battery indicator on Display CALIBRATION Calibration is traceable to NIST standards OPERATING CONDITIONS Normal operating conditions for this product Ambien...

Page 8: ...own before the weighing process is done HOLD stores it away in memory Press to store the weight into memory To recall last weight reading press HOLD LB KG BASIC SYSTEM OPERATION SETTING SYSTEM ZERO DETERMINING WHEELCHAIR WEIGHT Make sure the sca and press the ZERO button The displa ASE WAIT HANDS ale system while Z The system WAIT weighing su The WEIGH button wakes up the display and shows the pat...

Page 9: ...nt s weight only CONTINUOUS WEIGH In this default mode the weighing surface remains active Press the HOLD button once to lock the displayed reading and store it in memory as the last weight for recall later if needed AUTO HOLD This mode is for patients unable to remain still for the weighing procedure It locks stores and displays the patient s weight as soon as the WEIGH button is pressed once Not...

Page 10: ...ignal This signal is amplified by an operational amplifier and ed to a digital micro con oller where it is filtered converted to appropriate units and displayed on a liquid display Strain gauge force cells each contain four strain gauges mounted in a full Wheatstone bridge configu ysical moveme trical resistance o in v ss the Wheatstone bridge which is amplified by the opera to current sum the out...

Page 11: ...TEP 1 Figure 1 Remove the two 2 screws on the bottom of the display housing Lift the display panel The calibration buttons are located on the PC Board STEP 2 Figure 6 Press and hold both butto Figure 6 Calibration Button Diagram ns simultaneously SW5 and SW6 STEP 3 The display will read HOLD TO CAL as the right hand digit counts down to enter the CAL mode STEP 4 When in the CAL mode press the ZERO...

Page 12: ... located internally on the PC Board Refer to PC BOARD LAYOUT SW2 and SW5 STEP 2 Simultaneously press buttons indicated to initialize the system The display will read HOLD TO INIT and count down from 9 to 0 When the initializing is complete the display ill read INITIALIZING and then return to the WEIGH mode w STEP 3 Follow the CALIBRATION procedure CAUTION The integrated circuits and semiconductors...

Page 13: ...eelc The characters only appear on half of the display Press the WEIGH button or remove battery Wait five seconds then re install the battery and try the WEIGH button again one The display lights appear to work but do ot respond to button activa Button may not have bounced back up after being and inspect buttons Make sure the rubber boot is not sitting too high Re n tion pressed Remove the facepla...

Page 14: ...ns are to be shipped FREIGHT PREPAID to SR Instruments Inc 600 Young Street Tonawanda NY 14150 RESTOCKING FEE 15 fee for any scale that has been opened and used 10 fee for any scale returned that has been ordered incorrectly or refused delivery with no model change 5 fee if an error in ordering has been made and a different model exchanged No fees will be charged if the scale is returned because o...

Page 15: ...ting and Service Manual S N 1913 Part No MAN755KG_100929 Page 15 of 16 SInstruments 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 SInstruments Inc NOTES ...

Page 16: ... 1913 Part No MAN755KG_100929 Page 16 of 16 SInstruments 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 SInstruments Inc By SInstruments Inc Precision Technology in Perfect Balance ...

Reviews: