SR Instruments SR Scales SR241 Manuel de service

Model SR241 Portable Infant/Adult Scale

Service Manual

Part No. MAN241_201006 Page 1 of 14

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

Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com

by S Instruments, Inc.

Operating and Service

Manual

Model

SR241/SR241SO

Portable Infant / Adult Scale

Model SR241 Portable Infant/Adult Scale

Service Manual

Part No. MAN241_201006 Page 2 of 14

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

Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com

TABLE OF CONTENTS

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

PACKING CHECKLIST –MODEL SR241..................................................................................3

PACKING CHECKLIST –MODEL SR241SO ............................................................................3

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

REPLACEMENT PARTS AND ACCESSORIES ........................................................................4

SYSTEM DESCRIPTION AND INTENDED USE.......................................................................4

SYSTEM DESCRIPTION AND INTENDED USE (CONT’D) ...................................................5

STORAGE.........................................................................................................................................5

CLEANING AND DISINFECTING...............................................................................................6

SPECIFICATIONS...........................................................................................................................7

BUTTON FUNCTIONS...................................................................................................................8

BASIC SYSTEM OPERATION......................................................................................................9

BATTERY REPLACEMENT.......................................................................................................10

THEORY OF OPERATION .........................................................................................................11

CALIBRATION..............................................................................................................................12

TROUBLESHOOTING.................................................................................................................12

WARRANTY...................................................................................................................................13

TABLE OF FIGURES

Figure 1: Optional Soft-Sided Carry Case ...................................................................................5

Figure 2: SR241/SR241SO Label ..................................................................................................8

Figure 3: SR241/SR241SO Battery Compartment....................................................................10

Model SR241 Portable Infant/Adult Scale

Service Manual

Part No. MAN241_201006 Page 3 of 14

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

Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com

PACKING CHECKLIST –Model SR241

Portable Infant / Adult Scale

PACKING CHECKLIST –Model SR241SO

Portable Scale



DESCRIPTION

QUANTITY

SCALE BASE

1 ea

INFANT CRADLE

1 ea

9 VOLT BATTERY

1 ea

CERTIFICATE OF CALIBRATION

1 ea

MANUAL

1 ea

OPTIONAL ITEMS IF ORDERED

SOFT-SIDED CARRY CASE

1 ea



DESCRIPTION

QUANTITY

SCALE BASE

1 ea

9 VOLT BATTERY

1 ea

CERTIFICATE OF CALIBRATION

1 ea

MANUAL

1 ea

OPTIONAL ITEMS IF ORDERED

SOFT-SIDED CARRY CASE

1 ea

Model SR241 Portable Infant/Adult Scale

Service Manual

Part No. MAN241_201006 Page 4 of 14

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

Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com

ASSEMBLY

STEP 1: Unpack the scale system and check parts against the PACKING CHECKLIST. If there are

any missing or damaged parts, call the Service Hotline at: 1-800-654-6360.

STEP 2: Insert the 9-volt battery. See BATTERY REPLACEMENT instructions.

STEP 3: SR241 scale system Infant Cradle slides onto the Scale Base and snaps securely into

position.

REPLACEMENT PARTS and ACCESSORIES

SYSTEM DESCRIPTION and INTENDED USE

SYSTEM DESCRIPTION

The SR241/SR241SO Portable Infant/Adult 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 patient’s weight is displayed on an LCD screen. With a push of a button, weight data may be

viewed in either pounds or kilograms with a displayed resolution of 0.1 lb. or 0.1 kg.

Part #

Description

SM4028

REPLACEMENT INFANT CRADLE

SR241SO

SCALE ONLY

MAN241

MANUAL

PP-4022

SOFT-SIDED CARRY CASE

Model SR241 Portable Infant/Adult Scale

Service Manual

Part No. MAN241_201006 Page 5 of 14

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

Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com

SYSTEM DESCRIPTION and INTENDED USE (Cont’d)

INTENDED USE

The SR241 Portable Infant/Adult Scale is a unique portable scale

system that offers the versatility of being able to weigh infants,

toddlers, and adults on one lightweight and weather resistant system.

Weighing in itself at a mere seven pounds, this scale is specialized

for use in pediatrician or physicians’ offices and is also perfect for

traveling nurse applications. The optional Soft-Sided Carry Case

(Figure 1) protects the scale and facilitates its portability.

The SR241 Portable Infant/Adult Scale is a preferred means of gathering

patient weight data of adults weighing up to 400 pounds (181 kilograms),

and infants to 44 pounds (20 kilograms). Load cell technology ensures accurate and repeatable weight

readings.

The SR241SO Portable Adult Scale is a unique portable scale system that is lightweight and

weather resistant. It weighs a mere four pounds. This scale is specialized for use in physicians’

offices and is also perfect for traveling nurse applications. The optional Soft-Sided Carry Case

(Figure 1) protects the scale and facilitates its portability.

The SR241SO Portable Adult Scale is a preferred means of gathering patient weight data of

patients weighing up to 400 pounds (181 kilograms). Load cell technology ensures accurate and

repeatable weight readings.

Please heed the following warning to avoid injury to the patient or attendant.

STORAGE

If storing this equipment for periods longer than three (3) months, remove the battery. 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).

Figure 1: Optional Soft-Sided

Carry Case

WARNING

DO NOT EXCEED

MAXIMUM WEIGHT LIMIT OF

400 LB / 181 KG

Prolonged exposure to extremes of heat or cold

can damage equipment and effect accuracy.

WARNING

Model SR241 Portable Infant/Adult Scale

Service Manual

Part No. MAN241_201006 Page 6 of 14

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

Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com

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 SR241 Portable Infant/Adult Scale

Service Manual

Part No. MAN241_201006 Page 7 of 14

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

Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com

SPECIFICATIONS

MAXIMUM WEIGHT

CAPACITY

Infant: 44 lb (20 kg)

Adult: 400 lb (181 kg)

DIMENSIONS

Infant Cradle: 22 in x 12.5 in (55 cm x 32 cm)

Adult Platform: 12 in x 14 in (31 cm x 36 cm)

DISPLAY TYPE

LCD

DISPLAY RESOLUTION

Infant: ¼ oz (0.01 kg)

Adult: 0.1 lb (0.1 kg)

ACCURACY

0.2% +/- 1 digit of displayed resolution (over 0.2 kg)

AUTO ZERO

One button operation

SR241 SCALE WEIGHT

7 lb (3 kg)

SR241SO SCALE WEIGHT

4 lb (2 kg)

AUTO POWER DOWN

After 1 minute

AVERAGING

Automatic digital filter

POWER SUPPLY

9-volt battery

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.

TRANSPORATION AND

STORAGE

Storage 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 SR241 Portable Infant/Adult Scale

Service Manual

Part No. MAN241_201006 Page 8 of 14

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

Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com

BUTTON FUNCTIONS

SYSTEM ZERO

ZERO –ADULT MODE

To zero for adult weigh: Press the large blue “ZERO” button. Display will

read “0.0”. When patient is placed onto the scale, net weight will be displayed.

ZERO –BABY MODE

To zero for infant weigh: Slide and snap the cradle into place on the scale. Place any

blankets, pads, or disposable liners being used for infant’s comfort on the cradle before

zeroing. Press the yellow “BABY MODE” button to zero the scale system. When

baby is placed on the scale, the infant’s net weight data will be displayed.

Note: When system is zeroed, memory is emptied.

LB / KG MODE BUTTONS

Press either button to switch weight display between pounds/ounces or kilograms during

the baby weighing process and press either button to switch the weight display between

pounds or kilograms during the adult weighing process.

Pressing either button after weigh process is finished and display has shut down re-

activates display and recalls last weight reading. This must be done before system is

zeroed.

Figure 2: SR241/SR241SO Label

Model SR241 Portable Infant/Adult Scale

Service Manual

Part No. MAN241_201006 Page 9 of 14

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

Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com

BASIC SYSTEM OPERATION

ADULT WEIGH

STEP 1: Remove infant cradle from base. Place scale on hard smooth floor surface to ensure

accurate data.

STEP 2: Press the large blue “ZERO” button and wait for the display to indicate “0.0”

STEP 3: Position patient on the platform. Weight will be displayed in a few seconds.

STEP 4: To recall last weight data, press the “LB” or “KG” buttons. Note: Must be done

before “ZERO” button is pressed.

STEP 5: If more weight needs to be added at any time during the weighing process,

add weight and press the blue “ADULT WEIGH” button. This will update the net

weight on the display

BABY WEIGH –OPTION 1

STEP 1: If necessary, attach the baby cradle by sliding and snapping it into place.

STEP 2: Place the platform on a stable counter or table-top.

STEP 3: Follow the directions for ZERO-BABY MODE in the previous section.

STEP 4: When the display indicates “0.0”, you may place the baby on the scale. If the

display shuts down before weight data can be noted, press the “LB” or “KG” button to recall the

last stored weight data.

BABY WEIGH –OPTION 2

STEP 1: Remove infant cradle from base. Place scale on hard smooth floor surface to ensure

accurate data.

STEP 2: Have an adult stand on the scale holding any accessories that will be necessary

for the baby’s comfort (blanket, diaper, etc.). Press the yellow “BABY ZERO” button.

This will zero the scale system and TARE the adult’s and additional accessories weight.

STEP 3: Place the baby in the adult’s arms. The weight displayed will be the infant’s net

weight.

STEP 4: To recall last weight data, press the “LB” or “KG” buttons. Note: Must be done

before “ZERO” button is pressed.

STEP 5: If more weight needs to be added at any time during the weighing process, add

weight and press the yellow “BABY WEIGH” button. This will update the net weight on

the display

Model SR241 Portable Infant/Adult Scale

Service Manual

Part No. MAN241_201006 Page 10 of 14

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

Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com

BATTERY REPLACEMENT

REPLACING BATTERIES

The display will read “LobAt”when battery is low and needs to

be changed.

STEP 1: (Figure 3) Turn the scale over and locate the battery

cover. Unscrew the two (2) screws.

STEP 2: Remove and replace with a 9-volt battery.

STEP 3: Press the “ZERO” button to confirm display is working.

STEP 4: Replace cover and securely tighten screws.

STEP 5: Zero the system.

Figure 3: SR241/SR241SO

Battery Compartment

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