SR Instruments SR725 Service manual

Model SR725 Series Wheelchair Scale System
Operating and Service Manual - S/N 4068+
Part No. MAN725_100928 Page 1 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2010 SInstruments, Inc.
by SInstruments, Inc.
Operating and Service
Manual
Serial Numbers: 4068+
Model
SR725 / SR725L
Wheelchair Scale System

Model SR725 Series Wheelchair Scale System
Operating and Service Manual - S/N 4068+
Part No. MAN725_100928 Page 2 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2010 SInstruments, Inc.
TABLE OF CONTENTS
TABLE OF FIGURES......................................................................................................................2
PACKING CHECKLIST SR725.....................................................................................................3
PACKING CHECKLIST SR725L..................................................................................................3
ASSEMBLY.......................................................................................................................................4
REPLACEMENT PARTS AND ACCESSORIES ........................................................................5
SYSTEM DESCRIPTION AND INTENDED USE.......................................................................6
MAINTENANCE AND CLEANING..............................................................................................7
STORAGE AND TRANSPORTATION ........................................................................................7
SPECIFICATIONS...........................................................................................................................8
BUTTON FUNCTIONS...................................................................................................................9
BASIC SYSTEM OPERATION......................................................................................................9
BATTERY REPLACEMENT.......................................................................................................10
THEORY OF OPERATION .........................................................................................................11
CALIBRATION..............................................................................................................................12
INITIALIZATION .........................................................................................................................13
TROUBLESHOOTING.................................................................................................................14
WARRANTY...................................................................................................................................15
TABLE OF FIGURES
Figure 1: Assembly Diagram .......................................................................................................4
Figure 2: Display Unit Cable Connection...................................................................................4
Figure 3: Display Unit....................................................................................................................5
Figure 4: Battery Cover Display Unit.........................................................................................5
Figure 5: Ramp Locking Pin........................................................................................................5
Figure 6: Mast Wing Nut .............................................................................................................7
Figure 7: Button Display..............................................................................................................9
Figure 8: Battery Compartment Cover Panel Screw..............................................................10
Figure 9: Calibration Button Diagram.....................................................................................12
Figure 10: Location of Internal Initialization Button................................................................13

Model SR725 Series Wheelchair Scale System
Operating and Service Manual - S/N 4068+
Part No. MAN725_100928 Page 3 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2010 SInstruments, Inc.
PACKING CHECKLIST SR725
Wheelchair Scale System
PACKING CHECKLIST SR725L
Wheelchair Scale System
√DESCRIPTION QUANTIT
Y
BASE ASSEMBLY: 32 in x 32 in (81 cm x 81 cm)
WITH ATTACHED MAST PIPE AND RAMP 1 ea
DISPLAY UNIT 1 ea
PACKAGE OF SIX (6) “D” CELL BATTERIES 1 ea
CALIBRATION CERTIFICATE 1 ea
WARRANTY CARD 1 ea
MANUAL 1 ea
√DESCRIPTION QUANTIT
Y
BASE ASSEMBLY: 32 in x 36 in (81 cm x 91 cm)
WITH ATTACHED MAST PIPE AND RAMP 1 ea
DISPLAY UNIT 1 ea
PACKAGE OF SIX (6) “D” CELL BATTERIES 1 ea
CALIBRATION CERTIFICATE 1 ea
WARRANTY CARD 1 ea
MANUAL 1 ea

Model SR725 Series Wheelchair Scale System
Operating and Service Manual - S/N 4068+
Part No. MAN725_100928 Page 4 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2010 SInstruments, Inc.
ASSEMBLY
STEP 1: Unpack the scale system 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: Verify that the serial number on the Display
Unit (1) matches that on the Base Assembly (3).
STEP 3: (Figure 1) Lay the Base Assembly (3) with the attached Mast Pipe (2) on the floor.
STEP 4: Loosen the Mast Wing Nut (4) to unlock the Mast Pipe. Pull the Mast Pipe out and away
from the scale to free it from the internal locking pin and swing it up until the Mast Pipe is
perpendicular to the platform. Gently push the Mast Pipe against the Base Assembly, engaging it
in the lock position.
STEP 5: Tighten the Mast Wing Nut to secure the Mast Pipe in place.
STEP 6: (Figure 2) Connect the display cable (pre-installed in Mast Pipe) into its mate located
in the base of the Display Unit. Secure the connection by giving the attached lock ring a 1/4 turn
to the right.
# PART NAME
1 Display Unit
2 Mast Pipe
3 Base Assembly
4 Mast Wing Nut
5 Battery Compartment Cover
6 Ramp
7 Ramp Locking Pin
8 Transport Wheels
Figure 1: Assembly Diagram
Figure 2: Display Unit
Cable Connection
Continued next page
2
3
4
1

Model SR725 Series Wheelchair Scale System
Operating and Service Manual - S/N 4068+
Part No. MAN725_100928 Page 5 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2010 SInstruments, Inc.
ASSEMBLY Cont’d
STEP 7: (Figure 3) Insert the mast pipe into the display post mount assembly. Tighten the 10-32 x 3/8”
Phillips screw(s) and ¼” x 20 x 3/8” Phillips screw (5).
STEP 8: Unscrew and remove the Battery Compartment Cover (6). Install the six (6) “D” cell batteries
as indicated on the plastic battery cradle. Replace the cover (Figure 4).
STEP 9: 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 10: (Figure 5) Open Ramp (7) by releasing the Ramp
Locking Pin (8) located on the right side of the Ramp near
Transport Wheel (9).
REPLACEMENT PARTS and ACCESSORIES
Figure 3: Display Unit
Figure 4: Battery Cover Display Unit
Figure 5: Ramp Locking Pin
Part # Description
CA3066 Display Label
FKDK57 Mast Wing Nut
MF1956 Leveling Foot Spacer
FK2284T52 Leveling Foot
7
8 9
5
6

Model SR725 Series Wheelchair Scale System
Operating and Service Manual - S/N 4068+
Part No. MAN725_100928 Page 6 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2010 SInstruments, Inc.
SYSTEM DESCRIPTION and INTENDED USE
SYSTEM DESCRIPTION
The SR725 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 SR725 Wheelchair Scale System to derive its power
from six (6) common “D” cell batteries that will provide up to 10,000 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. With a push of a button, weight
data may be viewed, in either pounds or kilograms, with a displayed resolution of 0.1 for each.
INTENDED USE
The SR725 Wheelchair Scale System is designed for
use as a weighing system for non-ambulatory wheel-
chair bound patients. Maximum weight capacity must
not exceed 1000 pounds or 454 kilograms, combined
patient/wheelchair gross weight.
WARNING
DO NOT EXCEED
MAXIMUM WEIGHT LIMIT OF
1000 LB / 454 KG

Model SR725 Series Wheelchair Scale System
Operating and Service Manual - S/N 4068+
Part No. MAN725_100928 Page 7 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2010 SInstruments, Inc.
MAINTENANCE and CLEANING
The Display Unit for the SR725 Wheelchair
Scale System is made of a powder-coated
aluminum. 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 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, fold Ramp (see Figure 4) into the closed position and lock with the Ramp Locking
Pin. Loosen the Mast Wing Nut (Figure 5). Lift the Mast Pipe Assembly away from the scale to free it
from the internal locking pin, and swing into position, parallel with the platform. Ensure that the internal
locking pin engages into the lock position. Tighten the Mast Wing Nut to secure the Mast Pipe
Assembly in position. Hold the Mast Pipe Assembly close to the Mast Wing Nut and roll the scale to the
new location.
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 6: Mast Wing Nut
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.
WARNING

Model SR725 Series Wheelchair Scale System
Operating and Service Manual - S/N 4068+
Part No. MAN725_100928 Page 8 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2010 SInstruments, Inc.
SPECIFICATIONS
MAXIMUM WEIGHT CAPACITY 1000 lb or 454 kg
PLATFORM SIZE SR725: 32 in x 32 in (81 cm x 81 cm)
SR725L: 32 in x 36 in (81 cm x 91 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 35 seconds
HOLD Stores displayed reading in memory
LAST WEIGHT RECALL Press “HOLD” button to recall last stored displayed weight
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 SR725 Series Wheelchair Scale System
Operating and Service Manual - S/N 4068+
Part No. MAN725_100928 Page 9 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2010 SInstruments, Inc.
BUTTON FUNCTIONS
ZERO The “ZERO” button is used to zero the system before placing a patient onto the scale system.
When pressed, the display message will indicate “ZEROING” “PLEASE WAIT” “HANDS
OFF” “PLEASE WAIT”. Ensure that nothing is in contact with the weighing surface during
this procedure. The display will read “WEIGHT 0.0 LB”(or KG).
WEIGH
The “WEIGH” button wakes up the display and shows the patient’s weight if it should Auto
Power Down before the weighing process is done.
HOLD
The “HOLD” button freezes the displayed weight and stores it away in memory. Press
“HOLD” to store the weight into memory. To recall last weight reading, press “HOLD”.
LB/KG MODE
Weight data may be viewed in either pounds or kilograms. Pressing the “LB/KG MODE”
button allows the operator to toggle between the two readings. Both pounds and kilograms are
displayed in a resolution of 0.1.
BASIC SYSTEM OPERATION
SETTING SYSTEM ZERO / DETERMINING WHEELCHAIR WEIGHT
Make sure the scale system is free and clear of any obstructions and press the “ZERO” button. The
displayed message will indicate “ZEROING” “PLEASE WAIT” “HANDS OFF” “PLEASE
WAIT”. Ensure nothing is in contact with the scale system while zeroing. In a few seconds, the display
will read “WEIGHT 0.0 LB” (or KG).
Figure 7: Button Display
Continued next page
Press box under each icon to activate command

Model SR725 Series Wheelchair Scale System
Operating and Service Manual - S/N 4068+
Part No. MAN725_100928 Page 10 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2010 SInstruments, 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 MODE
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 MODE
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 8) Unscrew the panel screw on the Battery Compartment Cover (8) 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 8: Battery Compartment Cover Panel Screw
8
CAUTION
Do not leave patient unattended on the scale platform.