SR Instruments SRSCALES SRV411i Manuale di servizio

Model SRV411iSmall Animal Floor Scale

Service Manual

Part No. MANSRV411i_210112 Page 1 of 16

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

SRV411i

Small Animal Floor Scale

Model SRV411iSmall Animal Floor Scale

Service Manual

Part No. MANSRV411i_210112 Page 2 of 16

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

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

TABLE OF CONTENTS

PACKING CHECKLIST –Model SRV411i..................................................................................3

ASSEMBLY.......................................................................................................................................3

SYSTEM DESCRIPTION and INTENDED USE.........................................................................4

MAINTENANCE and CLEANING................................................................................................5

STORAGE and TRANSPORTATION...........................................................................................4

SPECIFICATIONS...........................................................................................................................6

BUTTON FUNCTIONS...................................................................................................................7

BASIC SYSTEM OPERATION......................................................................................................8

THEORY OF OPERATION ...........................................................................................................9

CALIBRATION................................................................................................................................9

TROUBLESHOOTING.................................................................................................................13

WARRANTY...................................................................................................................................14

DISPLAY MOUNTING TEMPLATE..........................................................................................15

TABLE OF FIGURES

Figure 1: SRV411iButton Label....................................................................................................7

Figure 2: Calibration Button ........................................................................................................10

Figure 3: Select and Toggle Button..............................................................................................10

Model SRV411iSmall Animal Floor Scale

Service Manual

Part No. MANSRV411i_210112 Page 3 of 16

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

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

PACKING CHECKLIST –Model SRV411i

Small Animal Floor Scale

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: Determine installation location for scale and display, keeping in mind the display cable

length is six (6) feet and the display power cord length is four (4) feet. The display may lay flat on

a desk or end table. If desired, provisions for wall mount have been incorporated, and can be

accomplished in the manner described below.

A. The display should be installed by qualified personnel. The mounting hardware provided

will cover most wall applications.

B. Determine a position on the wall comfortable to the user. Mark the location of the two

(2) mounting holes on the wall (holes are spaced 2.5” on center apart) using the template

provided on page 15.

C. Drill the two (2) pilot holes, no larger than ¼” diameter in the locations marked. Install

the two (2) self-drilling screw anchors.

D. Install the two (2) #8 x 1” flat head screws supplied, leaving approximately ¼”

projecting from the wall.

STEP 3: Place the SRV411i Small Animal Floor Scale on a flat, hard floor surface. Ensure all

four corners of scale are in contact with the floor and scale does not rock.

NOTE: Scale should not be placed on carpet or uneven floor surfaces as this may interfere with

scale accuracy.

STEP 4: Connect the display cable to the scale, then connect the power cable to the display and

plug the power adapter into wall power.



DESCRIPTION

QUANTITY

SCALE BASE

1 ea.

SCALE DISPLAY

1 ea.

MOUNTING HARDWARE

1 ea.

AC WALL POWER ADAPTER (UL RECOGNIZED)

1 ea.

CERTIFICATE OF CALIBRATION

1 ea.

MANUAL

1 ea.

Model SRV411iSmall Animal Floor Scale

Service Manual

Part No. MANSRV411i_210112 Page 4 of 16

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

SYSTEM DESCRIPTION

The SRV411iSmall Animal Floor 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 small animal’s

weight.

The small animal’s weight is displayed on a LCD screen. With a push of a button, weight data

may be viewed in either pounds or kilograms.

INTENDED USE

The SRV411iSmall Animal Floor Scale is a unique lightweight, low profile stand-on scale system

for weighing small animals weighing up to 500 pounds (227 kilograms)

STORAGE and TRANSPORTATION

To maintain proper operation of this instrument, storage and transport conditions should not vary

outside the following conditions: Relative Humidity 0% to 85%, Ambient Temperature 14F to

122F (-10C to +50C).

DO NOT EXCEED

MAXIMUM WEIGHT LIMIT OF

500 LB / 227 KG

WARNING

Model SRV411iSmall Animal Floor Scale

Service Manual

Part No. MANSRV411i_210112 Page 5 of 16

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 SRV411iSmall Animal Floor Scale

Service Manual

Part No. MANSRV411i_210112 Page 6 of 16

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

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

SPECIFICATIONS

MAXIMUM WEIGHT

CAPACITY

500 lb (227 kg)

DIMENSIONS

Platform: 26.4 in x 18.3 in (67 cm x 47 cm)

DISPLAY TYPE

1” Digit LCD

DISPLAY RESOLUTION

+/- 0.1 lb (0.1 kg)

ACCURACY

0.2% +/- 1 digit of displayed resolution for calibrated range

AUTO ZERO

One button operation

AUTO WEIGH

Scale will automatically turn on and lock in on a stable

weight.

AUTO POWER DOWN

After 1 minute

AVERAGING

Automatic digital filter

POWER SUPPLY

AC Wall Power Supply (UL Recognized)

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

Model SRV411iSmall Animal Floor Scale

Service Manual

Part No. MANSRV411i_210112 Page 7 of 16

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

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

BUTTON FUNCTIONS

Figure 1: SRV411iButton Label

HOLD/RECALL BUTTON

Scale will automatically lock a stable weight that is greater than five pounds and “MEM” will be

displayed in the upper left of the display. To manually hold a weight reading at any time during

the weighing process, press the “Hold/Recall”button. To recall a weight in memory, press the

“Hold/Recall”button after the display has powered down or with less than five pounds on the

scale.

NOTE: When the scale is off, pressing any of the buttons will turn on the scale. Press and hold

the “Zero/Weigh” button to erase the last held weight from memory.

LB / KG BUTTON

Weight data may be viewed in either pounds or kilograms. Pressing the “lb/kg” button allows

the operator to toggle between the two readings.

ZERO / WEIGH BUTTON

The “Zero/Weigh” button is used to zero the system before using the scale system. Ensure that

nothing is in contact with the weighing surface during this procedure. The display will read “0.0

Lb” (or 0.0 kg).

The “Zero/Weigh” button also wakes up the display and shows the weight if it should Auto

Power Down before the weighing process is done.

NOTE: When system is zeroed, the Hold/Recall memory is erased.

Model SRV411iSmall Animal Floor Scale

Service Manual

Part No. MANSRV411i_210112 Page 8 of 16

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

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

BASIC SYSTEM OPERATION

SMALL ANIMAL WEIGHING

STEP 1: Place scale on hard smooth floor surface to ensure accurate data.

NOTE: Avoid carpeting or uneven flooring surfaces.

STEP 2: The scale will automatically turn on when weight is detected and lock in on a stable

weight.

Alternatively, press the “Zero/Weigh” button and wait for the display to indicate

“ZERO”. Release the “Zero/Weigh” button and the display will read “0.0”. Position

the small animal on the platform. Weight will be displayed in a few seconds. A stable

weight will automatically be stored in memory.

STEP 3: To manually hold a weight reading at any time during the weighing process, press the

“Hold/Recall” button.

NOTE: When the scale is off, pressing any of the buttons will turn on the scale. Press

and hold the “Zero/Weigh” button to erase the last held weight from

memory. Only the last stabilized weight will be held in memory.

SCREEN DISPLAYED SYMBOLS

Scale is zeroed and stabilized

MEM Weight is locked in memory (next stable weight will override memory)

Applied weight load has stabilized

Model SRV411iSmall Animal Floor Scale

Service Manual

Part No. MANSRV411i_210112 Page 9 of 16

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

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

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 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 Whetstone-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 Whetstone-bridge, which is amplified by the operational amplifier.

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 averages the data before locking in on the reading.

CALIBRATION

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.

IMPORTANT

CALIBRATION CHECK: Qualified service personnel only should perform this

procedure. 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.

Model SRV411iSmall Animal Floor Scale

Service Manual

Part No. MANSRV411i_210112 Page 10 of 16

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

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

CALIBRATION (CON’T)

Figure 2: Calibration Button

Figure 3: Select and Toggle Button

Initial System Setup

When initially set up, calibration is factory set and re-calibration is not needed. The Local

Gravitational Acceleration may have to be re-set for the current geographical location for

improved accuracy. Automatic Shut Off is shipped with a factory default of 60 seconds. If a

longer period of time (up to 900 seconds) is desired, then it will need to be re-set. Both

procedures are found below.

Access System Setup

To access all settings below, break the Calibration Seal. Press the calibration button (Figure 2) using

the pointed-end of a pen or similar item. CALmode is now active.

Refer to Figure 3. The Right Button allows you to toggle through the menus without saving any

parameters. The Left Button permits a menu item to be selected or a parameter saved.

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.

SELECT

BUTTON

TOGGLE

BUTTON

CALIBRATION

BUTTON

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