SR Instruments SR Scales SR463iR-PH Series Service manual

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 1 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m Copyright 2020 SInstruments, Inc.
S
by S Instruments, Inc.
In-Floor Platform Scale
Operating and Service
Manual
SR463iR-PH SERIES

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 2 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m Copyright 2020 SInstruments, Inc.
TABLE OF CONTENTS
TABLE OF FIGURES......................................................................................................................2
PACKING CHECKLIST- SR463IR-PH (TWO SEPARATE SHIPMENTS)............................3
PACKING CHECKLIST- SR463IR-PH (SINGLE SHIPMENT)...............................................3
PACKING CHECKLIST- SR463IR-3PH (TWO SEPARATE SHIPMENTS)..........................4
PACKING CHECKLIST- SR463IR-3PH (SINGLE SHIPMENT).............................................4
PACKING CHECKLIST- SR463IR-4PH (TWO SEPARATE SHIPMENTS)..........................5
PACKING CHECKLIST- SR463IR-4PH (SINGLE SHIPMENT).............................................5
ASSEMBLY.......................................................................................................................................6
REPLACEMENT PARTS AND ACCESSORIES ......................................................................10
SYSTEM DESCRIPTION .............................................................................................................10
INTENDED USE.............................................................................................................................10
CLEANING AND DISINFECTING.............................................................................................11
STORAGE AND TRANSPORTATION ......................................................................................12
SPECIFICATIONS.........................................................................................................................12
BUTTON FUNCTIONS.................................................................................................................13
BASIC SYSTEM OPERATION....................................................................................................14
THEORY OF OPERATION .........................................................................................................15
CALIBRATION..............................................................................................................................16
TROUBLESHOOTING.................................................................................................................18
WARRANTY...................................................................................................................................19
TABLE OF FIGURES
Figure 1: Wall Box Assembly/Conduit Placement.....................................................................6
Figure 2: Conduit Placement and Installation Tabs..................................................................6
Figure 3: Conduit Hole in Scale Frame ......................................................................................6
Figure 4: Concrete Fill and Installation Tabs............................................................................7
Figure 5: Hardware Placement....................................................................................................7
Figure 6: Cable Connection Inside Frame..................................................................................7
Figure 7: Side Clearance Adjustment Bolts ...............................................................................8
Figure 8: Front Panel Assembly..................................................................................................9
Figure 9: Handrail Attached to Scale..........................................................................................9
Figure 10: Button Display............................................................................................................13
Figure 11: Calibration Tolerance Table.....................................................................................16
Figure 12: Calibration Switch Diagram .....................................................................................16

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 3 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m Copyright 2020 SInstruments, Inc.
PACKING CHECKLIST- SR463iR-PH (Two Separate Shipments)
In-Floor Platform Scale
PACKING CHECKLIST- SR463iR-PH (Single Shipment)
In-Floor Platform Scale

DESCRIPTION
QUANTITY
1st Shipment
WALL BOX ASSEMBLY
1 ea
PIT FRAME ASSEMBLY
1 ea
CONDUIT
1 ea
¼” LONG FLAT HEAD SCREW
4 ea
INSTALLATION INSTRUCTIONS
1 ea
2nd Shipment
CABLE ASSEMBLY
1 ea
PLATFORM ASSEMBLY 32 IN X 36 IN
1 ea
FRONT PANEL ASSEMBLY
1 ea
HANDRAIL
1 ea
⅞” LONG FLAT HEAD SCREW
8 ea
½” LONG BUTTON HEAD SCREW
4 ea
STAR WASHERS
4 ea
CALIBRATION CERTIFICATE
1 ea
WARRANTY CARD
1 ea
MANUAL
1 ea

DESCRIPTION
QUANTITY
Box 1
FRONT PANEL/WALL BOX ASSEMBLY
1 ea
PLATFORM/PIT FRAME ASSEMBLY 32 IN X 36 IN
1 ea
CONDUIT
1 ea
CABLE ASSEMBLY
1 ea
HANDRAIL
1 ea
¼” LONG FLAT HEAD SCREW
4 ea
⅞” LONG FLAT HEAD SCREW
8 ea
½” LONG BUTTON HEAD SCREW
4 ea
STAR WASHERS
4 ea
INSTALLATION INSTRUCTIONS
1 ea
CALIBRATION CERTIFICATE
1 ea
WARRANTY CARD
1 ea
MANUAL
1 ea

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 4 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m Copyright 2020 SInstruments, Inc.
PACKING CHECKLIST- SR463iR-3PH (Two Separate Shipments)
In-Floor Platform Scale
PACKING CHECKLIST- SR463iR-3PH (Single Shipment)
In-Floor Platform Scale

DESCRIPTION
QUANTITY
1st Shipment
WALL BOX ASSEMBLY
1 ea
PIT FRAME ASSEMBLY
1 ea
CONDUIT
1 ea
¼” LONG FLAT HEAD SCREW
4 ea
INSTALLATION INSTRUCTIONS
1 ea
2nd Shipment
CABLE ASSEMBLY
1 ea
PLATFORM ASSEMBLY 32 IN X 50 IN
1 ea
FRONT PANEL ASSEMBLY
1 ea
HANDRAIL
1 ea
⅞” LONG FLAT HEAD SCREW
8 ea
½” LONG BUTTON HEAD SCREW
4 ea
STAR WASHERS
4 ea
CALIBRATION CERTIFICATE
1 ea
WARRANTY CARD
1 ea
MANUAL
1 ea

DESCRIPTION
QUANTITY
Box 1
FRONT PANEL/WALL BOX ASSEMBLY
1 ea
PLATFORM/PIT FRAME ASSEMBLY 32 IN X 50 IN
1 ea
CONDUIT
1 ea
CABLE ASSEMBLY
1 ea
HANDRAIL
1 ea
¼” LONG FLAT HEAD SCREW
4 ea
⅞” LONG FLAT HEAD SCREW
8 ea
½” LONG BUTTON HEAD SCREW
4 ea
STAR WASHERS
4 ea
INSTALLATION INSTRUCTIONS
1 ea
CALIBRATION CERTIFICATE
1 ea
WARRANTY CARD
1 ea
MANUAL
1 ea

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 5 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m Copyright 2020 SInstruments, Inc.
PACKING CHECKLIST- SR463iR-4PH (Two Separate Shipments)
In-Floor Platform Scale
PACKING CHECKLIST- SR463iR-4PH (Single Shipment)

DESCRIPTION
QUANTITY
1st Shipment
WALL BOX ASSEMBLY
1 ea
PIT FRAME ASSEMBLY
1 ea
CONDUIT
1 ea
¼” LONG FLAT HEAD SCREW
4 ea
INSTALLATION INSTRUCTIONS
1 ea
2nd Shipment
CABLE ASSEMBLY
1 ea
PLATFORM ASSEMBLY 48 IN X 72 IN
1 ea
FRONT PANEL ASSEMBLY
1 ea
HANDRAIL
1 ea
⅞” LONG FLAT HEAD SCREW
8 ea
½” LONG BUTTON HEAD SCREW
4 ea
STAR WASHERS
4 ea
CALIBRATION CERTIFICATE
1 ea
WARRANTY CARD
1 ea
MANUAL
1 ea

DESCRIPTION
QUANTITY
Box 1
FRONT PANEL/WALL BOX ASSEMBLY
1 ea
PLATFORM/PIT FRAME ASSEMBLY 48 IN X 72 IN
1 ea
CONDUIT
1 ea
CABLE ASSEMBLY
1 ea
HANDRAIL
1 ea
¼” LONG FLAT HEAD SCREW
4 ea
⅞” LONG FLAT HEAD SCREW
8 ea
½” LONG BUTTON HEAD SCREW
4 ea
STAR WASHERS
4 ea
INSTALLATION INSTRUCTIONS
1 ea
CALIBRATION CERTIFICATE
1 ea
WARRANTY CARD
1 ea
MANUAL
1 ea

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 6 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m Copyright 2020 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 label of
Wall Box Display matches that on Platform Base.
STEP 3: (Figure 1) Mount Wall Box Display into
wall and run the conduit, with connector cable
inside, down through wall and into pit as shown.
STEP 4: Prepare pit area to accept the Scale
Frame. It is recommended that a properly plumbed
drain be installed in the center of pit to avoid any
water buildup that might damage scale.
STEP 5: (Figure 2) Center the Scale Frame in the
pit using the supplied installation tabs to suspend the
frame in place (see “Pit Area Installation Notes”).
Pit Area Installation Notes
This is a rectangular frame so it is
important to check the placement
specifications to make sure the conduit
connection is properly placed facing the
wall where the conduit/cable connection
is located. There are holes cut for
conduit entry in the center of two sides
of the frame so the scale can be placed
with either the long or short side against
wall (Figure 3). Run conduit/cable
through hole and into pit area.
For 32” x 36” Platforms: If using
supplied installation tabs to suspend
frame while pouring concrete, pit
perimeter dimensions cannot exceed
44”x 48”.
For 32” x 50” Platforms: If using
supplied installation tabs to suspend
frame while pouring concrete,
perimeter dimensions of pit cannot
exceed 44”x 62”.
For 48”x 72” Platforms: If using
supplied installation tabs to suspend
frame while pouring concrete, pit
perimeter dimensions cannot exceed
60”x 84”.
Figure1: Wall Box Assembly/Conduit Placement
14 3/4"
CONDUIT
2 1/2" 9 3/4"
WALL BOX
DETAIL
3 3/4"
MIN PIT DEPTH OF 3"
53"
TO
CENTER
OF
BOX
INSTALLATIONTABS
12.0
CONDUIT
MINPITDIM
REFERTO
INSTALLATION
NOTES
MINPITDIM
REFERTOINSTALLATIONNOTES
Figure 2: Conduit Placementand Installation Tabs
Figure 3: Conduit Hole in Scale Frame

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 7 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m Copyright 2020 SInstruments, Inc.
ASSEMBLY cont’d
STEP 6: (Figure 4) Back fill around the perimeter of the Pit
Frame Assembly with 3000PSI concrete. Trowel the concrete
level with the scale frame and existing floor. Trowel the base of
the pit level with the base of the frame with a gradient toward the
centered drain, if used. Conduit and cable should be left free so
cable can be easily connected tothe Platform Assembly.
STEP 7: (Figure 5) When the
concrete has set, remove and
discard the installation tabs and
screws. Install the four ¼” long
flat head screws into holes left by
plate removal.
Figure 4: Concrete Filland
Installation Tabs
Figure5: Hardware Placement
Figure 6: Cable Connection
Inside Frame
STEP 8: Remove the Platform
Assembly from the Base Assembly
using a 5/32” hex wrench to remove
the four (4) mounting screws and set
aside.
STEP 9: (Figure 6) Place the Platform Assembly
into the Pit Frame Assembly. The cable connection
will plug into the connector on the platform base.
Ensure extra cable does not interfere with platform
top.
Platform Deck Mounting
Screws (4)
Platform Deck
Platform Base
Pit Frame
Side Clearance
Adjustment Bolts (8)

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 8 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m Copyright 2020 SInstruments, Inc.
ASSEMBLY cont’d
Note: This scale is designed so that the Platform
Assembly is level with the Pit Frame Assembly. When
tiling or carpeting the platform deck, be sure to
compensate for the thickness of the material. Tiling
Tip: If tiling the floor, the use of an extra tile (or
something with the same surface height) is placed
under each of the four leveling feet of the pit frame.
This will bring the scale surface flush with the tiled
floor.
STEP 10: (Figure 7) Adjust the eight (8) Side
Clearance Adjustment Bolts, so that the Platform
Assembly is at an equal distance from all sides of the
Pit Frame Assembly. Tighten bolts to secure Platform
Assembly in place.
STEP 11: (Figure 5) Set the Platform Deck onto the
platform base and secure in place with the four (4) top
mounting screws. Allow 1/8” gap between Platform
Assembly and floor.
STEP 12: Install building ground wire and green ground wire from Display Front Plate into the
terminal lug in the wall box.
STEP 13: Connect Transducer Cable to the mating cable on the back of the Display Front Plate
STEP 14: Connect A/C power wires to the power supply wire leads.
Figure7: Side Clearance Adjustment Bolts
Side Clearance
Adjustment Bolts
ELECTRIC SHOCK HAZARD
TURN OFF POWER AT CIRCUIT
BREAKER FOR DISPLAY PRIOR TO
INSTALLING FRONT PANEL. DISPLAY
IS POWERED BY 120V A/C 60HZ.
WARNING
QUALIFIEDELECTRICIAN MUST
INSTALLDISPLAY ACCORDINGTO
LOCAL, STATE, AND NATIONAL
STANDARDS. 20A OR LESSBREAKER
IS RECOMMENDED. GROUNDFAULT
INTERRUPTERIS RECOMMENDED.

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 9 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m Copyright 2020 SInstruments, Inc.
ASSEMBLY cont’d
STEP 15: Install Front Panel Assembly (Figure 8) to the previously mounted Wall Box
Assembly. Use supplied star washers and screws. Ensure that the screws are securely tightened.
STEP 16: Restore power to the display.
STEP 17: Secure the handrail to the platform deck using the eight (8) included flat head
screws.
Figure8: FrontPanel Assembly
Figure 9: Handrail Attached to Scale
WARNING
HAND RAIL IS INTENDED TO
HELP STABLIZE AN
AMBULATORY PATIENT. DO
NOT USE HAND RAIL AS A
LIFTING AID OR TO ASSIST IN
SUPPORTING A PATIENT.

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 10 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m Copyright 2020 SInstruments, Inc.
REPLACEMENT PARTS AND ACCESSORIES
SYSTEM DESCRIPTION
The SR463iR-PH Series weight systems are precision digital scales specifically designed for
installation in the floor so the weighing surface is flush.
This scale system employs the latest in microprocessor and load cell technology to provide accurate
and repeatable weight data. Four (4) identically matched load cell transducers are strategically placed
to ensure an accurate representation of the patient’s weight regardless of weight distribution.
The SR463iR-PH Series display units use 120v AC line power that is mounted in a recessed wall box
so the display is flush with the wall (Figure 8).
The patient’s weight is displayed on a 16-character dot matrix liquid crystal display. The weight data
may be viewed in either pounds or kilograms, with a displayed resolution of 0.1 for each.
INTENDED USE
The SR463iR-PH Series is designed to be used as a stand-on scale for weighing ambulatory
patients as well as a Wheelchair / Chair / Walker scale for semi or non-ambulatory applications.
Part #
Description
SE4961-1
CABLE ASSEMBLY, 12 FT
SE4961-2
CABLE ASSEMBLY, 15 FT
MAN463IR-PH
MANUAL
MF9526
HANDRAIL, SS, 34” X 34”
MF9527
HANDRAIL, SS, 48” X 34”
FRTP211C1
PAPER, THERMAL PRINTER 58MM (15 ROLLS)

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 11 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m 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.
CAUTION
DO NOT ALLOW THE PIT TO
FILL WITH WATER

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 12 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m Copyright 2020 SInstruments, Inc.
STORAGE and TRANSPORTATION
This is a built-in scale system. 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° (-10C to +50C).
SPECIFICATIONS
MAXIMUM WEIGHT CAPACITY
1000 lb or 454 kg
PLATFORM SIZE
SR463iR-PH: 32 in x 36 in (81 cm x 91cm)
SR463iR-3PH: 32 in x 50 in (81 cm x 127 cm)
SR463iR-4: 48 in x 72 in (122 cm x 183 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
ZERO
One button Auto-Tare
AUTO POWER DOWN
Adjustable between 30 and 300 seconds
AVERAGING
Automatic digital filter
POWER SUPPLY
120v AC, 50 –60 Hz
CALIBRATION
Calibration is traceable to NIST standards.
OPERATING CONDITIONS
Normal operating conditions forthis product:
Ambient Temperature Range: 68F to 85F (20C to 30C),
Relative HumidityRange: 0%-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 SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 13 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m Copyright 2020 SInstruments, Inc.
BUTTON FUNCTIONS
WEIGHPress and hold to zero scale. Button is used to zero the system before placing the patient
on the scale. Ensure that nothing is in contact with the weighing surface during this
procedure.
SEND (PRINTER)
Press to send stored values to printer. Output values include time, date, and weight. If
BMI was calculated, BMI and height will be included in the output values. Also, low
paper and low batteries are output values.
RECALL
Press to recall the last stored weight. The stored weight will be erased when the scale is
zero or another stable weight is stored.
BMI
Press to calculate BMI. When the “BMI” is pressed, the default 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”.
MENU Press Menu to toggle through the menu options.
UNITS: Use UP or DOWN arrow buttons to select “Lb/ in” or “Kg/ cm”. Press
ENTER to save changes.
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.
gLOCAL: Non-adjustable. Set at factory.
AUTOPRINT: Use Up or DOWN arrow button to select ON or OFF to automatically
print when the weight has stabilized. Press ENTER to save changes.
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”
Figure10: Button Display
Continued next page

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 14 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m Copyright 2020 SInstruments, Inc.
BUTTON FUNCTIONS con’t
ENTER
Press to save change in digits for calibration, for unit’s set-up, for time and date set-up
and saving completed calibration data.
UP / SELECT
Press UP to adjust height up from the default for BMI calculation, to increase the scale’s
“on time”, or to select a digit when setting time and date.
DOWN / CHANGE
Press DOWN to adjust the height down from the default for BMI calculation, 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. Press and hold the ZERO /
WEIGH button. The displayed message will indicate “HOLD TO ZERO”and count
down to zero. Release the button when display message indicates “HANDS OFF”. 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).
WEIGHING
Position the patient on the scale. 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.
RECALLING LAST STORED WEIGHT
Press to recall last stored weight. The stored weight will be erased when the scale is zero
or another stable weight is stored.

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 15 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m 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 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 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 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 integrating
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 is 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, for AutoHold, the micro-controller averages the data 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 averaging period.
The micro-controller can be placed in a calibration mode, where the system can be re-calibrated. In
the calibration mode, the result of the weigh operation is scaled to match the value by adjusting the
“up” and “down” calibration buttons. This new calibration factor is then stored in the non-volatile
memory.

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 16 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m 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
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 known calibrated weights, traceable to NIST.
NOTE: DO NOT USE barbells or un-calibrated weights.
STEP 2: Zero the scale by pressing and holding the ZERO/WEIGH
button.
STEP 3: Place the calibrated weight on the scale. Wait for scale to
stabilize; note scale reading.
STEP 4: Scale readings should be within Calibration Tolerance Table
(Figure 11)
Figure11: Calibration
Tolerance Table
Figure12: Calibration Switch Diagram
IMPORTANT
CALIBRATION Qualified service personnel only should perform this procedure. The
SR463iR-PH 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
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.
Continued next page

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 17 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m 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: Access the Calibration Switch by breaking the Calibration Seal on the underside of the
display extrusion. Put the scale system into the Calibration Mode by switching the calibration
switch on the display board (Error! Reference source not found.).
NOTE: USE A NON-METALLIC DEVICE TO SLIDE THE SWITCH. FAILURE TO DO
SO WILL RESULT IN DAMAGE TO THE BOARD
STEP 2: Select known calibrated weights, traceable to NIST, up to the Full Scale value
(maximum capacity).
STEP 3: Press the “MENU” button until “1000.0Lb FULL” is displayed. Set the FULL value to the
actual quantity of calibrated weight being used for Full Scale. Use the “UP” arrow button to select the
digit and the “DOWN” arrow button to change digit. Press “ENTER” to save changes. Press
“WEIGH” button to abort any changes.
STEP 4: Press the MENU button until “500.0Lb HALF” is displayed.
NOTE: The Half-Scale value is a value between zero and the Full Scale values. It is usually
close to half the Full Scale value.
Set the HALF value to the actual quantity of calibrated weight being used for Half Scale. Use the
“UP” arrow button to select the digit and the “DOWN” arrow button to change the digit. Press
“ENTER” to save changes. Press “WEIGH” to abort the changes.
STEP 5: Press MENU button until “3 PT CAL”is displayed. Press the “UP” arrow button.
STEP 6: Display will read “ZERO”. Ensure that all weight has been removed from the platform
and press the “UP” arrow button.
STEP 7: Display will read “ADD HALF”. Place the calibrated weight on platform for HALF
Scale. Allow weight to stabilize. Press “UP” arrow button to save change.
STEP 8: Display will read “ADD FULL”. Place the calibrated weight on platform for FULL
Scale. Allow weight to stabilize. Press “UP” arrow to save change.
STEP 9: Press “ENTER” button to save the calibration, or “WEIGH” button to exit without
saving.
STEP 10: Switch the scale system out of the Calibration Mode on the display board (Error!
Reference source not found.).
NOTE: Ensure that no wires have become unplugged during calibration
STEP 11: Calibration Seal must be placed over the access hole on the display extrusion by
authorized personnel only.

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 18 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m Copyright 2020 SInstruments, Inc.
TROUBLESHOOTING
SYMPTOM
REASON/CORRECTIVE ACTION
Display screen toggles “DOOR OPEN”
Printer paper door is not completely closed. Close
door.
Display screen toggles “DOOR AND
PAPER”
There is no paper in the printer and the printer
paper door is not completely closed. Install new
paper roll.
Display screen toggles “PAPER OUT”
There is no paper in the printer. Install new paper
roll.
Display screen toggles “PAPER LOW”
The printer paper is getting low. Replace paper
roll as soon as possible.
Characters only appear on half of the display
Press the “WEIGH” button.
Display shows no reading at all
Check to ensure that circuit breaker to the scale is
on.
Display reads “WEIGHT OVERLOAD”
Disconnect the transducer cable from the platform.
If the “WEIGHT OVERLOAD” message goes
away, the problem is in the platform. Check to
make sure the platform transducer wires are intact
and pit is clean and dry.
For additional information or assistance, phone our Service Hotline: [phone]
or e-mail: s[email protected]
WARNING
ELECTRIC SHOCK HAZARD.
QUALIFIED SERVICE
PERSONNEL ONLY

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 19 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m Copyright 2020 SInstruments, Inc.
WARRANTY
FOUR (4) YEAR LIMITED WARRANTY
Each S 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 station. 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. Purchaser should file any
claims for shortage or damage with the delivery carrier and should refuse any shipment that has
obvious external damage.
RETURN POLICY
All products being returned to SR Instruments, Inc. require a Return Goods Authorization number
(RGA). To receive an RGA, call our Customer Service at 716-693-5977 ext 103 or toll-free in the
USA and Canada at 800-654-6360 ext 103.
When inquiry is made, please supply model and serial numbers, purchase order and reason for
return.
Generally, deleted, damaged, and outdated merchandise will not be accepted for credit. A
minimum restocking charge of 15% will be assessed on return of current merchandise unless scale
is returned because of SR error.
No returns will be accepted after 30 days.
All returns are to be shipped FREIGHT PREPAID to: SR Instruments, Inc., 600 Young Street,
Tonawanda, NY 14150.
RESTOCKING FEE
15% fee will be assessed on return of current merchandise
No fees will be charged if the scale is returned because of an error on the part of SR
Instruments, Inc.
No returns accepted after 30 days.

Model SR463iR-PH, SR463iR-3PH Series In-Floor Platform Scale
Operating and Service Manual
Part No. MAN463iR-PH_201118 Page 20 of 20
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected]m Copyright 2020 SInstruments, Inc.
S
S Instruments, Inc.
Precision & Technology in
Perfect Balance®