SR Instruments SRScales SR555 Operating And Service Manual

Model SR555 Stand-On Scale

Model SR555

Operating and Service Manual - S/N 1800+
Part No. MAN555_060829 Page 1 of 18

by S Instruments, Inc.

Operating and Service

SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150

Tel: [phone] Fax: [phone] URL: www.srscales.com

email: [e-mail] Copyright 2006 SInstruments, Inc.

Stand-On Scale System

Manual

Serial Numbers: 1800+

Model SR555 Stand-On Scale
Operating and Service Manual - S/N 1800+
Part No. MAN555_060829 Page 2 of 18

TABLE OF CONTENTS

TABLE OF FIGURES......................................................................................................................2

PACKING CHECKLIST.................................................................................................................3

ASSEMBLY.......................................................................................................................................4

REPLACEMENT PARTS AND ACCESSORIES ........................................................................6

SYSTEM DESCRIPTION AND INTENDED USE.......................................................................7

MAINTENANCE AND CLEANING..............................................................................................7

STORAGE AND TRANSPORTATION ........................................................................................8

SPECIFICATIONS...........................................................................................................................9

BUTTON FUNCTIONS.................................................................................................................10

BASIC SYSTEM OPERATION....................................................................................................10

BATTERY REPLACEMENT.......................................................................................................11

THEORY OF OPERATION .........................................................................................................12

CALIBRATION..............................................................................................................................13

INITIALIZATION .........................................................................................................................14

TROUBLESHOOTING.................................................................................................................15

WARRANTY...................................................................................................................................16

TABLE OF FIGURES

Figure 1: Assembly Diagram.........................................................................................................4

Figure 2: Cable Clamp, Display Cable, Connector, and Set Screws..........................................5

Figure 3: Battery Compartment Diagram....................................................................................5

Figure 4: Handrail/Height Bar Diagram......................................................................................6

Figure 5: Button Display ..............................................................................................................10

Figure 6: Bottom of Scale Base....................................................................................................11

Figure 7: Calibration Button Diagram.......................................................................................13

Figure 8: Location of Internal Initialization Buttons................................................................14

SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150

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Model SR555 Stand-On Scale
Operating and Service Manual - S/N 1800+
Part No. MAN555_060829 Page 3 of 18

PACKING CHECKLIST

SR555 Stand-On Scale

DESCRIPTION QUANTITY



Box 1

BASE ASSEMBLY (FIVE (5) SET SCREWS IN PLACE) 1 ea
MAST 1 ea
DISPLAY UNITWITH CABLE (FIVE(5) SET SCREWS IN PLACE) 1 ea
PACKAGE OF SIX (6) “C” 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

Box 2

OPTIONAL HANDRAIL SET WITH HARDWARE 1 ea
OPTIONAL HEIGHT BAR 1 ea

SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150

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Model SR555 Stand-On Scale
Operating and Service Manual - S/N 1800+
Part No. MAN555_060829 Page 4 of 18

ASSEMBLY

# PART NAME

Display Unit

1

Base Assembly

2

Mast

3

Cable Clamp

4

Display Cable Connector

5

Handrails (optional)

6

Height Bar (optional)

7

7

Battery Compartment

8

1

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: (Figure 1) Verify that the serial number on the
Display Unit (1) matches that on the Base Assembly (2).

3

6

STEP 3: Remove the four (4) set screws from Base

Assembly collar and apply a small amount of Loctite
to each. Insert Mast (3) into Base Assembly collar and
seat firmly. Re-install set screws in Base Assembly
collar and tighten securely.

STEP 4: Feed the display cable down through the Mast
and pull out through the Base Assembly.

2

STEP 5: Remove the set screws from the Display Unit

collar. Set the Display Unit squarely on top of the Mast
with the display label facing the scale platform. Apply a
small amount of Loctite to the four (4) set screws and
reinstall the set screws, tightening securely.

8

Figure 1: Assembly Diagram

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Model SR555 Stand-On Scale
Operating and Service Manual - S/N 1800+
Part No. MAN555_060829 Page 5 of 18

ASSEMBLY cont’d

STEP 6: (Figure 2) Lay the system on its side

and remove the Cable Clamp (4) from the Base
Assembly. Attach the Display Cable Connector
(5) to its mate in the Base Assembly.

STEP 7: (Figure 2) IMPORTANT: Reinstall
the Cable Clamp! Set the display cable into the

groove under the Cable Clamp and reinstall the
Cable Clamp, leaving just enough slack to
alleviate any tension on the Display Cable
Connector. Securely tighten the two (2) Cable
Clamp screws. Slide the extra cable back up into
the Mast. Excess cable MUST NOT contact the
floor.

STEP 8: (Figure 3) Open the Battery Compartment cover
and install the six (6) supplied “C” cell batteries as indicated
on the cover diagram. Tightly close the cover.

STEP 9: Return the scale to the upright position.

5

4

Figure 2: Cable Clamp, Display Cable, Connector,

and Set Screws

Figure 3: Battery Compartment Diagram

Continued next page

SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150

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Model SR555 Stand-On Scale
Operating and Service Manual - S/N 1800+
Part No. MAN555_060829 Page 6 of 18

ASSEMBLY cont’d

INSTALLING OPTIONAL HANDRAILS
STEP 1: (Figure 4) Attach top of each of the Handrails (6) to the bottom right and left of the

Display Unit (1) with the two (2) screws and two (2) split-lock washers on each side and slightly
tighten. (Do not tighten all of the way.)

STEP 2: Attach the bottom of the Handrails to the right and left side of the Base Assembly
using one (1) screw and one (1) split-lock washer for each handrail. Tighten all six (6) screws
securely.

INSTALLING OPTIONAL HEIGHT BAR
STEP 1: (Figure 4) Remove the set screw on the back

of the Display Unit (1) and in the Base Assembly (2).
STEP 2: Slide the Height Bar (7) down through the

hole in the Display Unit and seat firmly into the Base
Assembly. Apply a small amount of Loctite to the two

(2) set screws and reinstall, tightening securely.

1

2

Figure 4: Handrail/Height Bar Diagram

REPLACEMENT PARTS and ACCESSORIES

Part # Description

SR3070 Handrail Set with assembly hardware
SR3086 Height Bar: Extends from 43 in to 79 in (109 cm to 201 cm)

SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150

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Model SR555 Stand-On Scale

WARNING

WARNING

Operating and Service Manual - S/N 1800+
Part No. MAN555_060829 Page 7 of 18

SYSTEM DESCRIPTION and INTENDED USE

SYSTEM DESCRIPTION

The SR555 Stand-On 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 SR555 to derive its power from six (6)
common “C” 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 SR555 Stand-On Scale System is specifically
designed for use as a stand-on scale for weighing
ambulatory patients. Optional equipment includes a
Handrail Set and Height Bar. SR555 Stand-On Scale
System is a preferred means of gathering patient weight
data of ambulatory patients weighing up to 1000
pounds or 454 kilograms.

MAXIMUM WEIGHT LIMIT OF

DO NOT EXCEED

1000 LB / 454 KG

MAINTENANCE and CLEANING

SR555 Stand-On Scale System is made of
powder-coated aluminum casting with
stainless steel riser posts. 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.

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.

SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150

Tel: [phone] Fax: [phone] URL: www.srscales.com

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Model SR555 Stand-On Scale
Operating and Service Manual - S/N 1800+
Part No. MAN555_060829 Page 8 of 18

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 SR555, lower the Height Bar if included, tilt the scale back and wheel to the new
location. Lower the platform back down to the floor being careful not to shock the scale.

SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150

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Model SR555 Stand-On Scale
Operating and Service Manual - S/N 1800+
Part No. MAN555_060829 Page 9 of 18

SPECIFICATIONS

MAXIMUM WEIGHT CAPACITY

PLATFORM SIZE

DISPLAY TYPE

DISPLAY RESOLUTION

ACCURACY

AUTO ZERO

AUTO POWER DOWN

HOLD

LAST WEIGHT RECALL

AVERAGING

POWER SUPPLY

1000 lb or 454 kg
15 3/4 in x 18 1/2 in (40 cm x 47 cm)
16-Character Dot-Matrix LCD

0.1 lb/0.1 kg

0.1% +/- 1 digit of displayed resolution for calibrated
range

One button operation
Approximately 35 seconds
Stores displayed readingin memory
Press hold button to recall last stored displayed reading
Automatic digital filter
Six (6) “C” cell batteries

Low battery indicator on Display

CALIBRATION

OPERATING CONDITIONS

TRANSPORTATION and

STORAGE

Calibration is traceable to NIST standards.
Normal operatingconditions for thisproduct:

Ambient Temperature Range: 68F to 85F (20C to
30C)Relative HumidityRange: 0%-85%

Avoidexposure to high-pressure water or steam.
Storage and transportation 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.

SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150

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Model SR555 Stand-On Scale
Operating and Service Manual - S/N 1800+
Part No. MAN555_060829 Page 10 of 18

BUTTON FUNCTIONS

Press box under each icon to activate command

Figure 5: Button Display

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

Make sure the scale is free and clear of any obstructions and press the “ZERO” button. The
displayed message will indicate “ZEROING” “PLEASE WAIT” “HANDS OFF”
“PLEASE WAIT”. Make sure that nothing is in contact with the scale while zeroing the
system. In a few seconds, the display will read “WEIGHT 0.0 LB” (or KG). 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.

After the scale has been set to zero, position the patient on the scale. Display will indicate the
patient’s weight in either pounds or kilograms

SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150

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Continued next page

Model SR555 Stand-On Scale
Operating and Service Manual - S/N 1800+
Part No. MAN555_060829 Page 11 of 18

BASIC SYSTEM OPERATION cont’d

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 “CHANGE BATTERIES”.
STEP 2: (Figure 5) Place the scale on its side and open the battery compartment cover located in

the bottom of the scale base.
STEP 3: Remove and replace ALL six (6) “C” 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.

SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150

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Figure 6: Bottom of Scale Base

Model SR555 Stand-On Scale
Operating and Service Manual - S/N 1800+
Part No. MAN555_060829 Page 12 of 18

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
amplifieris configured to current sum the output of each cell, with potentiometers servingto adjust the
sensitivity (voltage out per unitof weight applied) of each bridge. The offset potentiometer produces a
small current,whichnulls 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, and 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 than0.1% in the AutoHold mode, the micro-controller will reset
thefilter and starta new averagingperiod.

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.

SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150

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Model SR555 Stand-On Scale

APPLIED

99.9

100.0

100.1

IMPORTANT

“-” “+”

CALIBRATION BUTTONS

Operating and Service Manual - S/N 1800+
Part No. MAN555_060829 Page 13 of 18

CALIBRATION

CALIBRATION CHECK Qualified service personnel only should perform this
procedure. The SR555 load cell itself has 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.

Figure 7: Calibration Button Diagram

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: (Figure 7) 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.

CALIBRATION

STEP 2: Press and hold both buttons simultaneously.
STEP 3: The display will read “HOLD TO CAL” as the right hand digit

countsdown to enter the CAL mode.
STEP 4: When in the CAL mode, press the “ZERO” button to zero

the display.
STEP 5: Place a known calibrated weight, traceable to NIST, onto the

weighing surface and compare it to the displayed reading. Note: DO
NOT USE barbell weights or calibrate to a mechanical scale.

STEP 6: Use the “-” or “+” button to make corrections to the
displayed weight. The displayed value should be within 0.1% of the
calibrated weight, plus or minus 1 digit of reading.

TOLERANCE TABLE

LOW

LIMIT

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

LOAD

HIGH

LIMIT

STEP 7: When settings are completed: Press
the “HOLD” button to SAVE the settings or
press the “WEIGH” button to CANCEL. Both
choices will EXIT the CAL mode.

The integrated circuits and semiconductors on
the printed circuit boards may be damaged

CAUTION

by electrostatic discharge (ESD). Be sure to
use proper handling precautions at all times.

SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150

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email: [e-mail] Copyright 2006 SInstruments, Inc.

Model SR555 Stand-On Scale

The integrated circuits and semiconductors

on

Operating and Service Manual - S/N 1800+
Part No. MAN555_060829 Page 14 of 18

INITIALIZATION

INITIALIZATION PROCEDURE

To be used ONLY IF REPLACING IC5 or if DISPLAY READS DOUBLE

Internal Initialization Buttons

SW5

Figure 8: Location of Internal Initialization Buttons

SW2

STEP 1: (Figure 8) Remove the two (2) screws on the bottom of the display housing. The
initialization buttons are 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
will read, “INITIALIZING” and then return to the WEIGH mode.

STEP 3: Follow the CALIBRATION procedure.

CAUTION

the printed circuit boards may be damaged
by electrostatic discharge (ESD). Be sure to
use proper handling precautions at all times.

SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150

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Model SR555 Stand-On Scale

” button or remove one battery.

pressed. Remove the faceplate and inspect buttons.

.

Operating and Service Manual - S/N 1800+
Part No. MAN555_060829 Page 15 of 18

TROUBLESHOOTING

SYMPTOM REASON/CORRECTIVE ACTION

The characters only appear on half of the
display.

Press the “WEIGH
Wait five seconds, then re-install the battery and try
the “WEIGH” button again.

The display lights appear to work, but do

Button may not have “bounced” back up after being

not respond to button activation.

Makesurethe rubber “boot” is not sitting too high. Re­attach plate.

The display shows no reading at all. Check to ensure batteries are installed correctly (see

directions for BATTERY REPLACEMENT)
Check display cable to make sure it is connected
securely.

For additional information or assistance, telephone our Service Hotline: [phone]

or e-mail: [e-mail]

SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150

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Model SR555 Stand-On Scale
Operating and Service Manual - S/N 1800+
Part No. MAN555_060829 Page 16 of 18

WARRANTY

FOUR 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. 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 outdated 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

 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 of an error on the part of SR

Instruments, Inc.

 No returns accepted after 60 days.

SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150

Tel: [phone] Fax: [phone] URL: www.srscales.com

email: [e-mail] Copyright 2006 SInstruments, Inc.

Model SR555 Stand-On Scale
Operating and Service Manual - S/N 1800+
Part No. MAN555_060829 Page 17 of 18

NOTES

SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150

Tel: [phone] Fax: [phone] URL: www.srscales.com

email: [e-mail] Copyright 2006 SInstruments, Inc.

Model SR555 Stand-On Scale
Operating and Service Manual - S/N 1800+
Part No. MAN555_060829 Page 18 of 18

By SInstruments, Inc.

Precision & Technology in

SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150

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email: [e-mail] Copyright 2006 SInstruments, Inc.

Perfect Balance 