SR Instruments SR Scales SR725i Service manual

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 1 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
S
by SInstruments, Inc.
Operating and Service
Manual
Model
SR725i / SR725i-L
Wheelchair Scale

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 2 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
TABLE OF CONTENTS
TABLE OF FIGURES......................................................................................................................2
PACKING CHECKLIST –MODEL SR725I................................................................................3
PACKING CHECKLIST –MODEL SR725I-L............................................................................4
ASSEMBLY.......................................................................................................................................5
REPLACEMENT PARTS AND ACCESSORIES ........................................................................8
SYSTEM DESCRIPTION AND INTENDED USE.......................................................................9
MICROBAN ANTIMICROBIAL PROTECTION.......................................................................9
STORAGE AND TRANSPORTATION ......................................................................................10
CLEANING AND DISINFECTING.............................................................................................11
SPECIFICATIONS.........................................................................................................................12
BUTTON FUNCTIONS.................................................................................................................13
BASIC SYSTEM OPERATION....................................................................................................14
BATTERY REPLACEMENT.......................................................................................................16
THEORY OF OPERATION .........................................................................................................17
CALIBRATION..............................................................................................................................18
CONFIGURING SEND BUTTON................................................................................................20
TROUBLESHOOTING.................................................................................................................21
WARRANTY...................................................................................................................................22
NOTES.............................................................................................................................................23
TABLE OF FIGURES
Figure 1: Scale System Diagram.....................................................................................................5
Figure 2: Parts Identification List..................................................................................................5
Figure 3: Display Mount .................................................................................................................6
Figure 4: Display Unit .....................................................................................................................6
Figure 5: Printer Mounting Collar.................................................................................................7
Figure 6: Printer Mounting Bracket..............................................................................................7
Figure 7: Mast Snap Lock.............................................................................................................10
Figure 8: Button Display ...............................................................................................................13
Figure 9: Battery Compartment Panel Screw.............................................................................16
Figure 10: Calibration Tolerance Table......................................................................................18
Figure 11: Calibration Switch Diagram ......................................................................................18
Figure 12: Display Board Calibration Switch Location.............................................................19

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 3 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
PACKING CHECKLIST –Model SR725i
Wheelchair Scale System

DESCRIPTION
QUANTITY
Box 1
SCALE ASSEMBLY; 32 in x 30 in (81 cm x 76 cm)
1 ea
PACKAGE OF SIX (6) “D” CELL BATTERIES
1 ea
CALIBRATION CERTIFICATE
1 ea
WARRANTY CARD
1 ea
MANUAL
1 ea
Box 2 SR8219 Optional Printer Kit
PRINTER
1 ea
PRINTER BATTERY CHARGER
1 ea
PRINTER CABLE
1 ea
PRINTER MOUNTING COLLAR& HARDWARE
1 ea
PRINTER MOUNTING BRACKET & HARDWARE
1 ea
PRINTER PAPER
1 ea
LOCTITE
1 ea

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 4 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
PACKING CHECKLIST –Model SR725i-L
Wheelchair Scale System

DESCRIPTION
QUANTITY
Box 1
SCALE ASSEMBLY; 36 in x 30 in (91 cm x 76 cm)
1 ea
PACKAGE OF SIX (6) “D” CELL BATTERIES
1 ea
CALIBRATION CERTIFICATE
1 ea
WARRANTY CARD
1 ea
MANUAL
1 ea
Box 2 SR8219 Optional Printer Kit
PRINTER
1 ea
PRINTER BATTERY CHARGER
1 ea
PRINTER CABLE
1 ea
PRINTER MOUNTING COLLAR& HARDWARE
1 ea
PRINTER MOUNTING BRACKET & HARDWARE
1 ea
PRINTER PAPER
1 ea
LOCTITE
1 ea

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 5 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
ASSEMBLY
STEP 1: Unpack the scale and check parts against the PACKING CHECKLIST. If there are any
missing or damaged parts, please call the Service Hotline at: 1-800-654-6360.
STEP 2: Verifythat the serial number on theDisplayUnit (1) matches that on the Base Assembly (3).
Figure 1: Scale System Diagram
Figure 2: Parts Identification List
STEP 3: (Figure 1) Lay the scale on the floor with the feet on the floor.
STEP 4: Adjust leveling feet, located in each of the four corners of the underside of the Base
Assembly, to ensure that the scale will sit level on the floor. Note: Leveling feet must be in place
to operate the scale properly.
STEP 5: Pull up the Snap Lock (4) to unlock the mast. Pull the mast up and away from the scale
until the mast is perpendicular to the platform. Mast should lock into place when perpendicular.
#
PART NAME
1
Display Unit
2
Mast
3
Base Assembly
4
Mast Snap Lock
5
Battery Compartment Cover
6
Ramp
7
Transport Wheels
8
Printer Mounting Collar
(optional)
9
Printer Cable (optional)
10
Printer (optional)
1
3
2
4
6
9
8
10
7
1
5
1
10
5
Continued next page

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 6 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
ASSEMBLY (Cont’d)
STEP6: (OPTIONAL) When received, the SR725i scale display will be positioned facing the
caregiver. To reposition the display to face the patient, remove the mounting screw and rubber
bumper from the display base (Figure 3). Rotate the display 180 degrees. Re-insert mounting
screw and rubber bumper and tighten. Note: To provide correct alignment and to secure the
display to the mast properly, ensure that threaded end of rubber bumper is threaded into the hole in
the display mast.
Figure 3: Display Mount
NOTE: If an optional printer has been ordered, go to Page 7 “INSTALLING OPTIONAL
PRINTER” before proceeding.
Figure 4: Display Unit
STEP 7: Unscrew the Battery Cover Panel Screw (11) and remove the Battery Compartment
Cover (5) from the Display Unit (figure 4). Install the six (6) “D” cell batteries as indicated on the
plastic battery cradle. Replace the cover.
2
11

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 7 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
ASSEMBLY (Cont’d)
INSTALLING OPTIONAL PRINTER
STEP 1: Loosen the Phillips Pan Head screw and the black rubber bumper on the back side of
the display, until the display will lift off of the mast post.
STEP 2: Carefully loosen the display cable connector.
STEP 3: Slide the Printer Mounting Collar (8) over the Mast (2). Position the Printer Mounting
Collar approximately two inches from the top of the Mast. Tighten the two (2) set screws to
secure the Printer Mounting Collar to the Mast. NOTE: The three (3) holes on the Printer
Mounting Collar should be towards the top of the Mast facing the same direction as the scale
display readout (Figure 5).
STEP 4: Apply a small amount of Loctiteto the two (2) small screws provided and attach the
Printer Mounting Bracket (12) to the Printer Mounting Collar (figure 6).
STEP 5: Attach the Printer to the Printer Mounting Bracket by inserting the tabs on the Printer
Mounting Bracket (12) into the slots on the back of the Printer and carefully snap in place.
STEP 6: After the Display Unit (1) is installed, plug the Printer Cable plug (9) into the Printer
and into the connector on the bottom of the Display Unit; tighten Printer Cable screws.
Figure 5: Printer Mounting Collar
Figure 6: Printer Mounting Bracket
12

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 8 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
REPLACEMENT PARTS and ACCESSORIES
Part #
Description
SR8219
Printer Kit (optional; contains all printer parts listed below)
FRAP1300
Printer
FRAP1300BR-01
Printer Mounting Bracket
SE8294
Printer Cable
FRAP1300BP01
Rechargeable Battery Pack
FRBC1300
Printer Battery Charger
FRTP130012C
Paper, thermal printer 58mm (10 Rolls)
MF8209
Printer Mounting Collar

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 9 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
SYSTEM DESCRIPTION and INTENDED USE
SYSTEM DESCRIPTION
The SR725i / SR725i-L Wheelchair 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 low power microprocessor circuitry allows the SR725i/ SR725i-L to derive its power from
six (6) common “D” cell batteries, which 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 an
AC power supply cord on a portable scale.
The patient’s weight is displayed on a 16-character dot matrix LCD. The weight data may be viewed
in either pounds or kilograms with a displayed resolution of 0.1 for each.
INTENDED USE
The SR725i / SR725i-L Wheelchair Scale is
specifically designed for use as a portable patient
weighing system for ambulatory and non-ambulatory
wheelchair bound patients. Maximum weight capacity
must not exceed 1000 pounds or 454 kilograms gross
weight.
MICROBAN ANTIMICROBIAL PROTECTION
Microban® antimicrobial technology has been added to help reduce the growth of bacteria as part
of a medical center's approach to creating a cleaner healthcare environment. For more information,
visit https://www.microban.com/sr-scales
WARNING
DO NOT EXCEED
MAXIMUM WEIGHT LIMIT OF
1000 LB / 454 KG

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 10 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
STORAGE and TRANSPORTATION
STORAGE
If storing this equipment for periods longer than three (3) months, remove the batteries. To
maintain proper operation of this instrument, 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
To transport the scale, pull up on the Snap Lock (Figure 7). Fold Mast Pipe Assembly down into
the scale platform assembly. Press down on the Snap Lock to ensure it snaps into place and
secures the Mast Pipe Assembly in position. Use the built in handles to transport the unit with the
built in wheels.
See ASSEMBLY for detailed instructions to re-assemble the scale system. When placing the
scale system in the new location, care should be taken not to shock the unit. Lift the scale up and
onto the Transport Wheels.
Figure 7: Mast Snap Lock

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 11 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
CLEANING and DISINFECTING
CLEANING
To clean the display / user interface and other scale contact areas:
Use a soft cloth dampened with water and mild detergent to clean scale surfaces.
Wipe surface with clean soft cloth dampened with water and then dry with clean soft cloth.
Do not use abrasive materials to clean scale surface to prevent damage to the surface
finish.
Do not spray liquid directly onto scale surfaces. Use only a damp cloth.
DISINFECTION
To disinfect the display / user interface and other scale contact areas:
Use a soft cloth dampened with disinfectant or a damp disposable disinfectant cloth. Cloth
cannot be dripping wet. Follow manufacturer’s instruction on the proper use of
commercially available disinfectants.
Disinfectant solutions with 1% sodium hypochlorite or 70% isopropyl alcohol are suitable
for display / user interface and other scale contact surfaces.
After disinfecting, use a soft cloth dampened with clean water and dry with a soft clean
cloth to prevent buildup of material on scale finish.
Do not use abrasive material to disinfect / clean scale surfaces to prevent damage to the
surface finish.
Do not spray liquid directly onto scale surfaces. Use only a damp cloth.
WARNING: DO NOT SPRAY CLEANING SOLUTION OR LIQUIDS DIRECTLY
ON SURFACES TO BE CLEANED.
WARNING: EXPOSURE TO EXCESSIVE LIQUID WILL DAMAGE USER
INTERFACE KEYPAD.
WARNING: DO NOT USE PRESSURIZED WATER OR STEAM. THE SCALE
SYSTEM CONTAINS ELECTRONIC COMPONENTS THAT MAY BE
ADVERSELY AFFECTED BY EXPOSURE TO SUCH AN
ENVIRONMENT.

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 12 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
SPECIFICATIONS
MAXIMUM WEIGHT CAPACITY
1000 lb or 454 kg
PLATFORM SIZE
SR725i: 32 in x 30 in (81 cm x 76 cm)
SR725i-L: 36 in x 30 in (91 cm x 76 cm)
DISPLAY TYPE
16-Character dot matrix LCD
DISPLAY RESOLUTION
0.1 lb / 0.1 kg
ACCURACY
0.1% +/- 1 digit of displayed resolution for calibrated
range
AUTO ZERO
One button operation
AUTO POWER DOWN
Approximately 30 seconds (adjustable to 300 seconds)
ENTER
Stores displayed reading in memory
RECALL
Recalls last stored stable weight, height, and BMI
AVERAGING
Automatic digital filter
POWER SUPPLY
Six (6) “D” cell batteries
CALIBRATION
Calibration is traceable to NIST standards
OPERATING CONDITIONS
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.
TRANSPORT and STORAGE
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).
Remove batteries if storing longer than three (3) months.

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 13 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
BUTTON FUNCTIONS
Figure 8: Button Display
ZERO / WEIGH
Press and hold to zero. The display will read “WT = 0.0 Lb”. This is used to zero the
system before placing the patient on the scale system. This action also resets previously
stored weight, height and BMI values to zero. Ensure that nothing is in contact with the
weighing surface during this procedure.
Press to weigh. Weight stable indicator “” flashes then remains solid when stable. Auto
stores stable weight in memory.
SEND (PRINTER / EHR)
Press to send stored values to EHR or to printer. Output values include time, date, weight,
height, and BMI. Also, indicated on display when paper is out, “PAPER OUT” and when
door is open, “PAPER DOOR OPEN”.
RECALL
Press to recall the last stable weight. Display will scroll thru “WT”, “HT”, and “BMI”
stored values in approximately two second intervals.
MENU
Press Menu to edit setup.
Setting the UNITS: Use UP or DOWN arrow buttons to select “Lb” or “Kg”. Press
ENTER to save changes.
Setting ON TIME: Use UP or DOWN arrow buttons to adjust the “ON TIME”. The
“ON TIME” may be set from 30 to 300 seconds in 30 second increments. Press ENTER
to save changes.
Setting TIME and DATE: Use the UP arrow button to select digit. To change digit use
the DOWN arrow button. Press ENTER to save changes.
NOTE: When selected, the year position defaults to “00”
Continued next page

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 14 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
BUTTON FUNCTIONS (Cont’d)
ENTER
Press to save height data and display BMI calculation. Stable weight, height and BMI
values are stored in memory until next stable weight is stored or until system is zeroed.
BMI
Press to calculate the BMI. When the “BMI”is pressed, the default starting value “HT =
65 in”or “HT = 165 cm” is displayed. If there is no stored stable weight, the display will
indicate “NO WEIGHT DATA” and then go back to the weigh screen “WT = 0.0 Lb”.
UP
Press UP to adjust height up from the default, to increase the scale’s “on time”, or to
select a digit when setting time and date.
DOWN
Press DOWN to adjust the height down from the default, to decrease the scale’s “on
time”, or to change the value of a selected digit when setting time and date.
BASIC SYSTEM OPERATION
SETTING SYSTEM ZERO
Make sure the scale is free and clear of any obstructions and press and hold the ZERO /
WEIGH button. The displayed message will indicate “HOLD TO ZERO”and count
down to zero. Make sure that nothing is in contact with the scale while zeroing the system.
In a few seconds, the display will read “WT = 0.0 Lb”(or Kg). This action also resets
previously stored weight, height, and BMI values to zero.
WEIGHING
Press the ZERO/WEIGH button. Position the patient on the scale. Lock the patient’s
wheelchair brake to prevent movement. The weight stable indicator “” flashes on the
display. When the weight is stable, the weight stable indicator remains solid. The display
will indicate the patient’s weight in either pounds or kilograms; example: “WT = 123.5
Lb”. The stable weight is auto stored in memory.
NOTE: If patient will be using a cane for support on the scale, place the cane on the scale
while zeroing the system. This will ensure that the patient’s NET weight will be displayed.
It is recommended that the system be zeroed prior to each new patient.
CAUTION
DO NOT LEAVE PATIENT UNATTENDED ON THE SCALE PLATFORM

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 15 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
BASIC SYSTEM OPERATION (Cont’d)
CALCULATING BMI
Press to calculate BMI.
When the BMI button is pressed, the default starting value is set either to 65 in or to 165
cm; example: “HT = 65 in”. Use the UP or DOWN arrows to adjust the default height to
the value of the patient’s height.
NOTE: To calculate the BMI, a patient’s stable weight needs be stored as indicated in
“WEIGHING” above, if no stable weight has not been stored “NO WEIGHT DATA”
will be displayed and the display will then go back to the weigh screen “WT = 0.0 Lb”.
Press ENTER to save height data and display BMI calculation. The BMI will be
displayed; example: “BMI = 20.5”.
RECALLING LAST STABLE WEIGHT
Press to recall last stable weight.
The display will scroll thru “WT”, “HT”, and “BMI” stored values in approximately two
second intervals; example: “RCL WT = 123.5 Lb”, “RCL HT = 65 in” and “RCL BMI
= 20.5”.

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 16 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
BATTERY REPLACEMENT
STEP 1: The display will read “REPLACE BATTERY”.
STEP 2: (Figure 9) Unscrew the panel screw on the Battery Compartment Cover (13) and
remove the battery compartment cover.
STEP 3: Remove and replace ALL six (6) “D” cell batteries. Refer to diagram in the battery
compartment for placement.
STEP 4: Press the “WEIGH” button to confirm display is working.
STEP 5: Secure the battery cover using the panel screw.
STEP 6: Zero the system.
Figure 9: Battery Compartment Panel Screw
13
WARNING
DO NOT REMOVE BATTERIES WHILE
SCALE IS ON. ALLOW SCALE TO SHUT
DOWN NATURALLY THRU TIMING
OUT. THIS PREVENTS POSSIBLE
VOLTAGE DRAIN ON THE PRINTED
CIRCUIT BOARD COIN BATTERY.

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 17 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
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 on-chip analog to digital converter. The digital
signal is filtered, converted to appropriate units, and displayed on the 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, which is amplified by the operational
amplifier. The amplifier is configured to current sum the output of each cell, with potentiometers
serving to normalize 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 sigma-
delta converter sums a rapid sequence of 0's (0 volts) and 1's (reference voltage) to achieve
balance with the input signal from the amplifier.
The micro-controller 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 crystal display. The micro-controller performs a moving-median filter of data for
continuous weigh and, for AutoHold; the micro-controller performs checks for signal stability
before locking in on the reading. If the data variance is greater than 0.1% in the AutoHold mode,
the micro-controller will reset the filter and start a new filtering period.
The micro-controller can be placed in a calibration mode, where the system can be re-calibrated.
In the calibration mode, the system slope is calculated from two points (zero and full scale) in the
2-point calibration mode or the slope and change in slope is calculated from three points (zero,
half, and full scale) in the 3-point calibration mode.

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 18 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
LOW
LIMIT
APPLIED
LOAD
HIGH
LIMIT
99.9 100.0 100.1
199.8 200.0 200.2
299.7 300.0 300.3
399.6 400.0 400.4
499.5 500.0 500.5
599.4 600.0 600.6
699.3 700.0 700.7
799.2 800.0 800.8
899.1 900.0 900.9
999.0 1000.0 1001.0
CALIBRATION
TOLERANCE TABLE
CALIBRATION
NOTE: Ensure that nothing is in contact with the scale system during this procedure. Remove
hands from the system when noting the displayed calibration results.
CHECKING CALIBRATION
STEP 1: Select two (2) known calibrated weights, traceable to
NIST.
NOTE: The first weight should be at least 500 pounds (half of
the maximum scale capacity). The second weight should be less
than half of the first weight. DO NOT USE barbells or un-
calibrated weights.
STEP 2: Zero the scale by pressing and holding ZERO /
WEIGH button.
STEP 3: Place the first calibrated weight on the scale. Wait for
scale to stabilize; note scale reading. Remove weight.
STEP 4: Place second calibrated weight on scale. Wait for
scale to stabilize; note scale reading. Remove weight.
STEP 5:The scale readings for both weights should be within the
Calibration Tolerance plus or minus one digit of display
resolution (Figure 10).
Figure 10: Calibration Tolerance Table
Figure 11: Calibration Switch Diagram
Continued next page
IMPORTANT
CALIBRATION Qualified service personnel only should perform this procedure. The
SR725i / SR725i-L load cells have no user serviceable 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.
CALIBRATION SWITCH

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 19 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
CALIBRATION (Cont’d)
SETTING CALIBRATION
NOTE: Ensure that nothing is in contact with the scale system during this procedure. Remove
hands from the system when noting the displayed calibration results.
STEP 1: Remove the three (3) screws on the left side cover of the display housing. Put the scale
system into the Calibration Mode by switching the calibration switch (14) on the display board
(Figure 12). “CALIBRATION” will flash on the display.
STEP 2: Select two (2) known calibrated weights, traceable to NIST.
NOTE: The first weight should be at least 500 pounds (half of the maximum scale capacity). The
second weight should be less than half of the first weight. DO NOT USE barbells or uncalibrated
weights.
STEP 3: Press the MENU button until “FULL = 1000.00 Lb” is displayed. Set the FULL value of
the first selected calibrated weight. Use the UP arrow button to select the digit and the DOWN arrow
button to change digit. Press ENTER to save changes.
STEP 4: Press the MENU button until “HALF = 500.00 Lb” is displayed. Set the HALF value
of the second selected calibrated weight. Use the UP arrow button to select the digit and the
DOWN arrow button to change the digit. Press ENTER to save changes.
STEP 5: Press MENU button until “3 Pt Calibration” is displayed. Press the UP arrow button.
STEP 6: Zero the scale by removing all weight from the platform. Press the UP arrow button.
STEP 7: Place the HALF weight from Step 4 on platform. Allow weight to stabilize. Press UP
arrow to save change. Remove weight.
CAUTION
The integrated circuits and semiconductors on
the printed circuit boards may be damaged
by electrostatic discharge (ESD). Be sure to
use proper handling precautions at all times.
14
Continued next page
Figure 12: Display Board Calibration Switch Location

Model SR725iWheelchair Scale
Operating and Service Manual
Part No. MAN725i_MICROBAN_200603 Page 20 of 24
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2020 SInstruments, Inc.
CALIBRATION (Cont’d)
STEP 8: Place the FULL weight from Step 3 on platform. Allow weight to stabilize. Press UP
arrow to save change. Remove weight.
STEP 9: Press ENTER to save the calibration, or WEIGH to exit without saving.
STEP 10: Switch the scale system out of the Calibration Mode on the display board (Figure 13).
STEP 11: Reinstall the side cover onto the display housing and secure in place with three (3)
mounting screws.
CONFIGURING SEND BUTTON
STEP 1: Press the “MENU” key until “DATA OUT = PRINT” is displayed
STEP 2: Press “UP” or “DOWN” key to select between “EHR” and “PRINT”
STEP 3: Press the “ENTER” key to save
EHR OUTPUT
Electronic Medical Records (EMR) / Electronic Health Records (EHR) technology is supported by
the i-series scales from SR Instruments. The EMR/ EHR software is not included with scale.
There are many different EMR/ EHR software available and the connectivity of the scale to the
software requires the services of a professional.
A null modem cable is required to communicate with the scale.
Scale output when send button is configured to Electronic Health Records is as follows:
<esc>R<esc>Wnnn.n<esc>Hmmm.m<esc>Bkk.k<esc>Uuu<esc>E
Where:R is read
W is weight
nnn.n is the weight in Lb or kg
H is height
mmm.m is the height in inches or cm.
B is BMI
kk.k is the BMI
U is units (lb or kg; in or cm)
uu is LB or KG
E is end of packet.