SR Instruments SRSCALES SRV411i Service manual

Model SRV411iSmall Animal Floor Scale
Service Manual
Part No. MANSRV411i_210112 Page 1 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2021 SInstruments, Inc.
S
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: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2021 SInstruments, Inc.
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: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2021 SInstruments, Inc.
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: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2021 SInstruments, Inc.
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: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2021 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.

Model SRV411iSmall Animal Floor Scale
Service Manual
Part No. MANSRV411i_210112 Page 6 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2021 SInstruments, Inc.
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: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2021 SInstruments, Inc.
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: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2021 SInstruments, Inc.
o
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: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2021 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 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: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2021 SInstruments, Inc.
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

Model SRV411iSmall Animal Floor Scale
Service Manual
Part No. MANSRV411i_210112 Page 11 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2021 SInstruments, Inc.
CALIBRATION (CON’T)
Cal Menu
“data” Displays saved calibration and model information.
“unit” Set the available units; lb only, kg only, or selection of lb or kg with mode button.
“sec” Set Auto Power Down Timer between 15 and 900 seconds.
“grav” Set Gravitational Acceleration in m/s2
“Full” Applied calibrated mass at full scale.
“Half” Used with three point calibration curve. Applied calibrated mass at a second point
between zero and full scale, usually at half.
“zero” No calibrated weight applied.
“2 pt” Two-point calibration curve, zero and full scale.
“3 pt” Three-point calibration curve; zero, half and full scale.
“save” Saves the calibration data.
“quit” Quits without saving the calibration data.
Enter CAL Mode
To enter the CAL mode, press the calibration button (Figure 2) using the pointed-end of a pen or
similar item. Toggle through the menu with Right Button (Figure 3). Select or Save data with the
Left Button (Figure 3).
Auto Power Down Timer (Optional)
a) Toggle through the menu with the Right Button until the display shows “sec”then press the
Left Button to select.
b) The display will show four digits <0123>.
c) Set the desired time in seconds by selecting the first digit and toggling using the Right
Button through the digits until desired value is shown. Press the Left Button and continue
the same with the remaining digits. The value cannot be less than 15 nor greater than 900.
d) Press the Left Button and the display will show “SAVE”; to save changes, press the Left
Button and the display will show “SAV’d” or to exit without saving changes, press the
Right Button to toggle to “quit” and then press the Left Button.

Model SRV411iSmall Animal Floor Scale
Service Manual
Part No. MANSRV411i_210112 Page 12 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2021 SInstruments, Inc.
CALIBRATION (CON’T)
Gravitational Acceleration (Optional)
NOTE: Setting the local gravitational acceleration, “gLOC”, will not affect the calibration.
The local gravitational acceleration, “gLOC”, will become the calibrated
gravitational acceleration, “gCAL”only when it is recalibrated.
a) While in the CAL mode press the Right Button until the display shows “grav”then press the
Left Button to select.
b) The display will show only the four digits to the right of the decimal point <9.XXXX>.
c) Set the local gravitational acceleration in m/s2by selecting the first digit and toggling using
the Right Button through the digits until desired value is shown. Press the Left Button and
continue the same with the remaining digits.
d) Press the Left Button to SAVE and the display will show “SAV’d” or press the Right
Button to toggle to “quit” and then press the Left Button to exit without saving changes.
Full-Scale value
a) While in the CAL mode press the Right Button until the display shows “FULL” then press the
Left Button to displaydefault weight.
b) The display will show only the five digits <XXXX.X> with the thousand-place flashing
<1>. Select past to the next digit by pressing the Left Button.
c) Once in the hundreds-place, set the full scale value (maximum load) by toggling using the
Right Button through the digits until desired value is shown. Select the desired value by
pressing the Left Button and continue the same with the remaining digits.
d) Press the Left Button to SAVE and the display will show “SAV’d”or press the Right
Button to toggle to “quit” and then press the Left Button to exit without saving changes.
Half-Scale value
NOTE: The Half-Scale value is used only with the three-point calibration. It is a value
between zero and the Full Scale values. It is usually close to half of the Full Scale
value.
a) While in the CAL mode press the Right Button until the display shows “HALF” then press the
Left Button to displaydefault weight.
b) The display will show only the five digits <XXXX.X> with the thousand-place flashing
<1>. Select past to the next digit by pressing the Left Button.
c) Once in the hundreds-place, set the half scale value by toggling using the Right Button
through the digits until desired value is shown. Select the desired value by pressing the
Left Button and continue the same with the remaining digits.
d) Press the Left Button to SAVE and the display will show “SAV’d” or press the Right
Button to toggle to “quit” and then press the Left Button to exit without saving changes.

Model SRV411iSmall Animal Floor Scale
Service Manual
Part No. MANSRV411i_210112 Page 13 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2021 SInstruments, Inc.
CALIBRATION (CON’T)
Calibrate using the Two-Point Calibration Curve; zero and full scale.
a) While in the CAL mode press the Right Button until the display shows “2Pt” then press the
Left Button to display “ZERO”.
b) With no load applied, “ZERO” the scale by pressing the Left Button when the display
shows “zero”.
c) Display will show “FULL”, apply the predetermined full scale value on the scale and press
the Left Button.
d) Display will show Gravitational Acceleration values. Press the Left button to toggle thru
the values.
e) Display will show “SAVE”, press the Left Button to save and the display will show
“SAV’d” or press the Right Button to toggle to "quit" and then press the Left Button to
exit without saving changes.
f) Press the calibration button (Figure 2) using the pointed-end of a pen or similar item to exit
CAL mode.
g) Place a new calibration seal over the calibration button access hole.
NOTE: Calibrated weight displayed should be within tolerance as per specifications (see
“SPECIFICATIONS” page 6).
TROUBLESHOOTING
SYMPTOM
REASON/CORRECTIVE ACTION
Weight reading is much lower
than expected.
Check that the platform is clean underneath, stand on each of
the four corners to see if one corner is not weighing correctly.
System fails to perform
correctly.
Check power supply connections.
Make sure the scale is clear of any obstacles and that nothing,
including the vet, is touching the small animal or scale.
Set scale on smooth, hard floor surface.
For additional information or assistance, telephone our Service Hotline: [phone]
or e-mail: [e-mail]

Model SRV411iSmall Animal Floor Scale
Service Manual
Part No. MANSRV411i_210112 Page 14 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2021 SInstruments, Inc.
WARRANTY
TWO (2) YEAR LIMITED WARRANTY
Each Ssystem 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 two (2) 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 SRV411iSmall Animal Floor Scale
Service Manual
Part No. MANSRV411i_210112 Page 15 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2021 SInstruments, Inc.
DISPLAY MOUNTING TEMPLATE
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
provide below.
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.
2 ½”

Model SRV411iSmall Animal Floor Scale
Service Manual
Part No. MANSRV411i_210112 Page 16 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2021 SInstruments, Inc.
S
By SInstruments, Inc.
Precision & Technology in
Perfect Balance