SR Instruments SRScales SRV947R Service manual

Model SRV947R 24 X 48 Remote Display Platform
Operating and Service Manual
Part No. MAN947R _190624 Page 1 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2019 SInstruments, Inc.
SRV947R
REMOTE DISPLAY
PLATFORM SCALE
S
by SR Instruments, Inc.
Operating and Service
Manual

Model SRV947R 24 X 48 Remote Display Platform
Operating and Service Manual
Part No. MAN947R _190624 Page 2 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2019 SInstruments, Inc.
TABLE OF CONTENTS
TABLE OF FIGURES......................................................................................................................2
PACKING CHECKLIST –MODEL SRV947R............................................................................3
ASSEMBLY.......................................................................................................................................3
SYSTEM DESCRIPTION AND INTENDED USE.......................................................................4
MAINTENANCE AND CLEANING..............................................................................................5
STORAGE AND TRANSPORTATION ........................................................................................5
SPECIFICATIONS...........................................................................................................................6
BUTTON FUNCTIONS...................................................................................................................7
BASIC SYSTEM OPERATION......................................................................................................8
THEORY OF OPERATION ...........................................................................................................9
CALIBRATION..............................................................................................................................10
TROUBLESHOOTING.................................................................................................................14
DISPLAY MOUNTING TEMPLATE..........................................................................................15
TABLE OF FIGURES
Figure 1: SRV947R Button Label .................................................................................................7
Figure 2: Calibration Button ........................................................................................................10
Figure 3: Select and Toggle Button..............................................................................................10

Model SRV947R 24 X 48 Remote Display Platform
Operating and Service Manual
Part No. MAN947R _190624 Page 3 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2019 SInstruments, Inc.
PACKING CHECKLIST –Model SRV947R
Remote Display Platform 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: Connect signal cable to the underside of the platform.
STEP 4: Place SRV947R scale system on a flat, hard floor surface. Ensure all six feet of the
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 5: Connect the display cable to the scale, then connect the power cable to the display and
plug power adapter into wall.

DESCRIPTION
QUANTITY
SCALE BASE
1 ea.
SCALE DISPLAY
1 ea.
MOUNTING HARDWARE
1 ea.
AC WALL POWER SUPPLY (MEDICAL GRADE)
1 ea.
CERTIFICATE OF CALIBRATION
1 ea.
MANUAL
1 ea.

Model SRV947R 24 X 48 Remote Display Platform
Operating and Service Manual
Part No. MAN947R _190624 Page 4 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2019 SInstruments, Inc.
SYSTEM DESCRIPTION AND INTENDED USE
SYSTEM DESCRIPTION
The SRV947R Portable Platform Scale is a low profile design, 2 in. height, which allows the
animal easy step access. The SRV947R Scale can be used in a fixed location or as a portable
scale. The Scale employs the latest in microprocessor and load cell technology to provide accurate
and repeatable weight data. Six (6) 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.
INTENDED USE
The SRV947R Portable Platform Scale is a lightweight portable scale designed for use as a
weighing system for animals not exceeding 400 pounds or 182 kilograms, gross weight. Please
read the following warnings to avoid injury to the animal or attendant.
WARNING
DO NOT USE FOR ANIMAL TRANSPORT
DO NOT EXCEED MAXIMUM LIMIT OF 400 LBS / 182 KG

Model SRV947R 24 X 48 Remote Display Platform
Operating and Service Manual
Part No. MAN947R _190624 Page 5 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2019 SInstruments, Inc.
MAINTENANCE and CLEANING
The SRV947R Portable Platform Scale is made with a polyurea-coated aluminum platform.
Exercise caution when cleaning the display window as it is made of a clear plastic and can be
scratched by abrasive cleaners. Mild soap and water is recommended for general cleaning and
disinfecting.
STORAGE and TRANSPORTATION
STORAGE
If storing this equipment for periods longer than three (3) months, remove the batteries. 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).
TRANSPORTATION
The SRV947R Portable Platform Scale has four (4) recessed handles on the underside of the scale
for easy portability.
WARNING
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.

Model SRV947R 24 X 48 Remote Display Platform
Operating and Service Manual
Part No. MAN947R _190624 Page 6 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2019 SInstruments, Inc.
SPECIFICATIONS
MAXIMUM WEIGHT CAPACITY
400 lb / 182 kg
PLATFORM SIZE
24 in x 48 in x 2 in
(61 cm x 122 cm x 5 cm)
DISPLAY TYPE
1.0”LCD display with 5 active digits
DISPLAY RESOLUTION
0.2 lb / 0.1 kg
ACCURACY
0.2% +/- 2 digits 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.
AVERAGING
Automatic digital filter
POWER SUPPLY
AC Wall Power Supply (Medical Grade)
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%-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 to122F (-10C
to +50C). Remove batteries if storing longer than
three (3) months.

Model SRV947R 24 X 48 Remote Display Platform
Operating and Service Manual
Part No. MAN947R _190624 Page 7 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2019 SInstruments, Inc.
MODE
ZERO
HOLD/
RECAL
L
BUTTON FUNCTIONS
Figure 1: SRV947R Button Label
The “ZERO/WEIGH” button is used to clear the Recall memory and start a new
weighing cycle. Press and hold for 3 seconds to zero the display.
The “MODE” button is used to select pounds or kilograms.
The “HOLD/RECALL”button is used to “lock in” the weight currently displayed,
or to recall the last saved weight, if nothing is on the scale platform.

Model SRV947R 24 X 48 Remote Display Platform
Operating and Service Manual
Part No. MAN947R _190624 Page 8 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2019 SInstruments, Inc.
o
BASIC SYSTEM OPERATION
TURNING SYSTEM ON
Make sure the scale is free and clear of any obstructions and all six feet are touching a level
surface. Press the “ZERO” button and hold for 3 seconds. The display will read “ZERO” then
display “0.0” when system is ready for weighing.
UNIT
Press the “MODE” button to toggle between pounds or kilograms. The system will remain in the
same mode as last used unless manually changed.
WEIGH
The “WEIGH” button is used to clear the “Recall” memory and start a new weighing cycle.
HOLD/RECALL
The “HOLD/RECALL” button is used to “lock in” and store the weight currently displayed in
system memory. With no weight on the platform pressing the button again will recall the last
stored weight and display it for 15 seconds.
AUTOHOLD
With autohold enabled, when the system detects a stable weight, that value will be stored in
system memory. This value can later be recalled by pressing the “HOLD/RECALL” button with
no weight on the platform.
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 SRV947R 24 X 48 Remote Display Platform
Operating and Service Manual
Part No. MAN947R _190624 Page 9 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2019 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.

Model SRV947R 24 X 48 Remote Display Platform
Operating and Service Manual
Part No. MAN947R _190624 Page 10 of 16
SInstruments, Inc., 600 Young Street, Tonawanda, NY 14150
Tel: [phone] Fax: [phone] URL: www.srscales.com
email: [email protected] Copyright 2019 SInstruments, Inc.
CALIBRATION
Figure 2: Calibration Button
Figure 3: Select and Toggle Button
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.
CALIBRATION
BUTTON
SELECT
BUTTON
TOGGLE
BUTTON