SR Instruments SR255 Daily-Weigh Scale Operating and Service Manual
Below you will find brief information for Daily-Weigh Scale SR255. The SR255 Daily-Weigh Scale utilizes load cell technology to ensure accurate and repeatable weight readings. An operator can zero the system before weighing, select the weight unit (lb or kg), and use the HOLD button to freeze the reading.
advertisement
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
S
by
SInstruments, Inc.
Daily-Weigh
Scale
Operating and Service
Manual
Serial Numbers: 3616 +
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Page 1 of 23
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
TABLE OF CONTENTS
Page 2 of 23
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
TABLE OF FIGURES
Page 3 of 23
Figure 1: Assembled SR255 Daily-Weigh
Scale ......................................................................... 6
End of Stretcher Bar Channel on Stretcher ................................................. 8
Figure 16: Location of Internal Calibration Buttons and Offset Potentiometer .................... 17
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
PACKING CHECKLIST – SR255– ADULT
DESCRIPTION
Box 1
T-BOOM / MAST with INVACARE LIFTER
1/4-20 x 1” SOCKET HEAD CAP SCREW (for Mast Assy.)
INVACARE LIFTER BASE
3/8-16 x 1 ¼” SHOULDER BOLT (for T-Boom/Pump Assy.)
WASHER (for T-Boom/Pump Assy.)
3/8-16 LOCK NUT (for T-Boom/Pump Assy.)
SPREADER BAR
TRANSDUCER TUBE
6-32 x ½” SOCKET HEAD CAP SCREW (Safety Screw-
Transducer Assy.)
STAPH-CHECK STRETCHER (32” x 72”)
STRETCHER CUP
DISPLAY / BATTERY BOX (pre-attached to mast)
SIX (6) “D” CELL BATTERIES
A-FRAME
3/8-16 x 2 ¼” SHOULDER BOLT (for A-Frame Assy.)
3/8-16 LOCK NUT (for A-Frame Assy.)
3/16” ALLEN WRENCH
7/64” ALLEN WRENCH
½” OPEN END WRENCH
Box 2
STRETCHER BARS (72”)
Page 4 of 23
QUANTITY
1 ea
1 ea
1 ea
1 ea
1 ea
1 ea
1 ea
1 ea
2 ea
2 ea
2 ea
2 ea
1 ea
1 ea
1 ea
1 ea
1 ea
1 ea
6 ea
2 ea
HARDWARE NOTE: All hardware is already in position and “finger tight”. No nuts, bolts or screws are packaged separately.
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
PACKING CHECKLIST – SR255 – PEDIATRIC
Page 5 of 23
DESCRIPTION
Box 1
T-BOOM/MAST with INVACARE LIFTER
1/4-20 x 1” SOCKET HEAD CAP SCREW (for Mast Assy.)
INVACARE LIFTER BASE
3/8-16 x 1 ¼” SHOULDER BOLT (for T-Boom/Pump Assy.)
WASHER (for T-Boom/Pump Assy.)
3/8-16 LOCK NUT (for T-Boom/Pump Assy.)
SPREADER BAR
TRANSDUCER TUBE
6-32 x ½” SOCKET HEAD CAP SCREW (Safety Screw-
Transducer Assy.)
STAPH-CHECK STRETCHER (32” x 60”)
STRETCHER CUP
DISPLAY / BATTERY BOX (pre-attached to mast)
SIX (6) “D” CELL BATTERIES
A-FRAME
3/8-16 x 2 ¼” SHOULDER BOLT (for A-Frame Assy.)
3/8-16 LOCK NUT (for A-Frame Assy.)
3/16” ALLEN WRENCH
7/64” ALLEN WRENCH
½” OPEN END WRENCH
Box 2
STRETCHER BARS (60”)
HARDWARE NOTE: All hardware is already in position and “finger tight”. No nuts, bolts or screws are packaged separately.
2 ea
2 ea
1 ea
1 ea
1 ea
6 ea
2 ea
2 ea
2 ea
1 ea
1 ea
1 ea
QUANTITY
1 ea
1 ea
1 ea
1 ea
1 ea
1 ea
1 ea
1 ea
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
6
ASSEMBLY
7
8
4
5
9
3
4
10
Page 6 of 23
11
2
12
13
14
15
1
Figure 1: Assembled SR255 Daily-Weigh
Scale
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: 1-800-654-6360.
STEP 2: (Figure 1) Verify that the serial number on the Display Unit (3) matches that on the Transducer
Bar (6).
STEP 3: (Figure 2) Attach the Stretcher Cup (15) to the
Invacare Lifter Base (1), snapping it into place and twisting the lower tab back under the Mast (12), past the lower bolt.
# PART NAME
1 Invacare Lifter Base
2 Spreader Bar
3 Display Unit
4 Stretcher Bracket
5 T-Boom (Mast Hinge Connection)
6 Transducer Bar (T-Boom
Connection)
7 Lifter Pump (T-Boom Connection)
8 A-Frame (Stretcher Holders)
9 A-Frame Hook (Stretcher Bar)
10 Stretcher
11 Stretcher Bar Channels
12 Mast
13 Mast Anchor Screw
14 ¼-20x1 Socket Head Cap Screw
15 Stretcher Cup
Figure 2: Stretcher Cup
Installed
Continued next page
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
ASSEMBLY Cont’d
STEP 4: (Figure 3) Loosen the 1/4-20 x 1 in Socket
Head Cap Screw (14) found on the mast receptacle.
Insert Mast (12) into Invacare Lifter Base (1) as shown.
The bottom of the Mast is slotted. When properly set, the Mast will drop into place. The Display Unit
(3) will face away from the lifter legs and be perpendicular to the Invacare Lifter Base. Tighten
Socket Head Cap Screw to secure.
Figure 3: Mast
Placement and Screw
STEP 5: (Figure 4) Insert the Spreader Bar (2) into the receptacle at the base of the Mast (12). Secure tightly with screw which is shipped “finger tight” in place on Invacare Lifter Base.
STEP 6: (Figure 5) Attach and securely tighten the rod-end of the Lifter Pump (7) to the T-Boom
(5) using 3/8-16 x 1 ¼ in shoulder bolt, washer and 3/8-16 lock nut. All are shipped “finger tight” in place on T-Boom. Also tighten the Mast/T-
Boom hinge lock nut securely.
Page 7 of 23
Figure 4: Spreader
Bar Connected in
Receptacle
Figure 5: T-Boom - Lifter
Pump Connection
STEP 7: (Figure 6) Hang the Transducer Bar from the end of the T-Boom. Label on the
Transducer Bar must face away from unit. Tighten safety screws as shown to prevent separation of T-
Boom and Transducer Bar.
STEP 8: (Figure 7) Plug in the transducer cable to the receptacle on the top end of the T- Boom.
STEP 9: (Figure 8) Attach the two (2) A-Frames
(8) to each end of the Transducer Bar using the two
(2) 3/8-16 x 2 ¼ in shoulder bolts and two (2) 3/8-
16 locknuts. Tighten securely.
Figure 7: Transducer
Cable Connection
Figure 6: Transducer
Connected to T-Boom
Figure 8: Transducer -
A-Frame Connected
Continued next page
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
ASSEMBLY Cont’d
STEP 10: (Figure 9) Slide the stretcher bars into the sides of the Stretcher (10) by opening the Velcro
tabs and inserting the stretcher bars. Re-seal the ends. (When not in use, store the Stretcher in the Stretcher Cup (15) at the base of the unit and tuck into the Stretcher Bracket (4) attached to the Display to hold it upright.)
Page 8 of 23
Figure 9: Velcro
End of Stretcher Bar
Channel on Stretcher
STEP 11: (Figure 10) The Stretcher attaches to the A-
Frames by inserting their hooked ends through the four holes in the Stretcher.
Figure 10: A-Frame
Hook Placement on
Stretcher
REPLACEMENT PARTS and ACCESSORIES
Part #
SR290
SR295-SCR
SR290P
SR295-PSC
PF0755I
SM1932
FRSPREADER
FC6382-4SG
FC7381-4PG
CA3066
FCMS3116F8
MAN255
SR285
SR285-Q
Description
72” Stretcher Bars (Adult)
72” Stretcher (Adult)
60” Stretcher Bars (Pediatric)
60” Stretcher (Pediatric)
Stretcher Cup
T-Boom
Spreader Bar Handle
4-Pin Connector (T-Boom)
4-Pin Connector (Display)
Display Label
Transducer Connector
Service Manual. Please provide S/N when ordering.
Disposable Stretcher Covers (Box of 200)
Disposable Stretcher Covers (Box of 50)
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
SYSTEM DESCRIPTION and INTENDED USE
Page 9 of 23
SYSTEM DESCRIPTION
The SR255 Daily-Weigh
Scale employs the latest in microprocessor and load cell technology to provide accurate and repeatable weight data. Two (2) identically matched transducers are strategically placed to ensure an accurate representation of the patient’s weight.
The low power microprocessor circuitry allows the SR255 to derive its power from six (6) common “D” 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 lb. or
0.1 kg.
INTENDED USE
The SR255 Daily-Weigh
Scale is designed for use as a patient weighing system for non-ambulatory patients only. Please read the following warnings to avoid injury to the patient or attendant. The SR255 Daily-
Weigh
Scale is a preferred means of gathering patient weight data of nonambulatory patients weighing up to 400 pounds. The transducer bar, using load cell technology, ensures accurate and repeatable weight readings.
WARNING
DO NOT USE FOR PATIENT TRANSPORT.
MAXIMUM 400 LB / 181 KG CAPACITY.
SPREAD THE LEGS OF THE LIFTER BASE
PRIOR TO LIFTING AND WEIGHING
PATIENT.
DO NOT USE THE PUMP HANDLE TO
MANEUVER THE SCALE
Failure to spread the legs prior to suspending patient could cause lifter to tip over and injure patient and/or attendant.
MAINTENANCE and CLEANING
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.
The Hydraulic Pump is a factory sealed unit and
MUST be returned for service
.
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.
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
STORAGE and TRANSPORTATION
Page 10 of 23
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 SR255 Daily-Weigh
Scale from one location to another within the building, remove the Stretcher from the Stretcher Bar Hooks, roll up and place in the Stretcher Cup located at the base of the scale and behind the Stretcher Bracket located behind the Display Box.
Figure 11: Stretcher Cup Receptacle for
Transporting Scale
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
SPECIFICATIONS
MAXIMUM WEIGHT CAPACITY
400 lb or 181 kg
STRETCHER SIZE
Adult: 32 in x 72 in
Pediatric: 32 in x 60 in
Page 11 of 23
DISPLAY TYPE
16-Character dot-matrix LCD
DISPLAY RESOLUTION
0.1 lb or 0.1 kg
ACCURACY
0.1% +/- 1 digit of displayed resolution for calibrated range
AUTO ZERO
One button operation
AUTO POWER DOWN
After 35 seconds
HOLD
While active, freezes display data and stores it in memory
LAST WEIGHT RECALL
“Hold” button recalls last stored weight
AVERAGING
Automatic digital filter
POWER SUPPLY
Six (6) “D” cell batteries
CALIBRATION
Calibration is traceable to NIST standards
OPERATING CONDITIONS
Normal operating conditions for this product: 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 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
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
BUTTON FUNCTIONS
Page 12 of 23
Press box under each icon to activate command
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 “PLEASE WAIT”
“WEIGHING” “HANDS OFF”. 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 temporarily 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
ZERO
With the stretcher in place (without the patient), make sure scale is free and clear of any obstructions and press the “ZERO” button. The displayed message will indicate
“PLEASE WAIT” “WEIGHING” “HANDS OFF”. 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 a pillow or blanket is to be added for patient comfort, place them on the scale before performing the ZERO function so they will not be included in the patients’ weight.
Continued next page
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
BASIC SYSTEM OPERATION Cont’d
Page 13 of 23
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”.
STEP 1: Remove the Stretcher and position it under the patient. Include any additional items used when zeroing the system. Note: The bulk of the patient’s mass must be centered on the
Stretcher for proper balance.
STEP 2: (Figure 12)
SPREAD LEGS ON PATIENT-
LIFTER BEFORE ATTEMPTING TO LIFT THE
PATIENT!
CLOSED OPEN
Figure 12: Lifter Legs Opened/Closed
Continued next page
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
BASIC SYSTEM OPERATION Cont’d
STEP 3: (Figure 13) To RAISE the T-Boom, the Lock/ Release
Lever on the lifter must be in the LOCK position (left). Pump the handle. To LOWER the T-Boom, the Lock/Release lever on the lifter must be in the RELEASE position (right). Patient’s weight will slowly lower the T-Boom.
STEP 4: With the T-Boom raised, roll the scale forward so the two
(2) A-Frames are centered over the patient.
DO NOT USE THE
PUMP HANDLE TO MANEUVER THE SCALE!
Lower the T-
Boom and attach the A-Frame hooks into the Stretcher holes. Move the lever into the LOCK position. DO NOT EXCEED THE
MAXIMUM CAPACITY OF 400 LB/ 181 KG.
STEP 5: When the Stretcher is securely attached, pump handle until the patient is raised just enough to clear the bed and any linens, etc.
Weigh patient and when finished, lower back on to the bed by moving the Lock/Release Lever to RELEASE (right). Patient’s weight will lower the Stretcher slowly. Unhook the Stretcher and again raise the T-
Boom so the patient can be safely moved.
DO NOT ATTEMPT TO
TRANSPORT PATIENT VIA THE SCALE!
Page 14 of 23
Figure 13: Lifter LOCK/
RELEASE Lever
STEP 6: It is recommended that you re-zero before each weighing to ensure optimal accuracy.
NOTE:
Do not touch patient, stretcher or circular A-Frames during the weighing process. By design, these components are weight sensitive and any interference will affect the accuracy of the weight data.
WARNING
DO NOT USE FOR PATIENT TRANSPORT.
MAXIMUM 400 LB / 181 KG CAPACITY
SPREAD THE LEGS OF THE LIFTER BASE PRIOR
TO LIFTING AND WEIGHING PATIENT
Failure to spread the legs prior to suspending patient could bend legs or cause lifter to tip over and injure patient and/or attendant.
DO NOT USE THE PUMP HANDLE TO MANEUVER
THE SCALE
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
BATTERY REPLACEMENT
STEP 1: The display will read “CHANGE BATTERY” when the batteries are low.
Page 15 of 23
STEP 2: Unscrew the four (4) screws and open the Battery Compartment Cover on the front of the Display Unit.
STEP 3: Remove and replace ALL six (6) “D” cell batteries. Refer to diagram in the battery compartment for placement.
STEP 4: Press the “WEIGH” button to confirm display is working.
STEP 5: Replace the Battery Compartment Cover and replace the four (4) screws.
STEP 6: Zero the system.
Figure 14: Battery Compartment Cover
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
THEORY OF OPERATION
Page 16 of 23
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 amplifier is configured to current sum the output of each cell, with potentiometers serving to adjust the sensitivity (voltage out per unit of weight applied) of each bridge. The offset potentiometer produces a small current, which nulls 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, 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 than 0.1% in the AutoHold mode, the micro-controller will reset the filter and start a new averaging period.
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
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628 Page 17 of 23
CALIBRATION
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.
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 15) Remove the four (4) screws on the back of the display housing.
“-” “+”
Figure 15: PC Board
Access Cover
“-“ “+”
Figure 16: Location of Internal Calibration Buttons and Offset Potentiometer
STEP 2: (Figure 16) The Calibration buttons are located internally on the PC Board as indicated. Press the internal calibration buttons (SW5 and SW6) simultaneously to put system into calibration mode.
STEP 3: The display will read, “HOLD TO CAL” as the digit in the right hand corner counts down from 9 to 0. The display will then read “CALIBRATION” and periodically flash this on the display. In the far left corner of the display the letters
“CAL” will appear.
TOLERANCE TABLE
LOW
LIMIT
99.9
CALIBRATION
199.8
299.7
APPLIED
LOAD
100.0
200.0
300.0
HIGH
LIMIT
100.1
200.2
300.3
399.6 400.0 400.4
Continued next page
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
CALIBRATION Cont’d
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.
Page 18 of 23
STEP 4: System offset is displayed on the right side of the screen and should read between +35 and +40 pounds. Use a fine blade screwdriver to adjust Offset Potentiometer (R13).
STEP 5: When in CAL mode, press the “ZERO” button to zero the display.
STEP 6: Center a known calibrated weight, traceable to NIST, on the stretcher and compare to display reading.
STEP 7: Adjust the reading, using the “+” or “-” buttons to match the weight. Display should be within 0.1% of the calibrated weight. See Calibration Tolerance Table.
STEP 8: Remove the weight and re-zero. Repeat steps 5, 6, and 7 until correct.
STEP 9: 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.
INITIALIZATION
INITIALIZATION PROCEDURE
To be used ONLY IF REPLACING IC5 or if DISPLAY READS DOUBLE
Internal Initialization Buttons
SW2
SW5
Figure 17: Location of Internal Initialization Buttons
Continued next page
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628 Page 19 of 23
INITIALIZATION Cont’d
STEP 1: Remove the four (4) screws on the back of the display housing. (Figure 17) The
Initialization Buttons (SW2 and SW5) are located internally on the PC Board as indicated.
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 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.
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
TROUBLESHOOTING
SYMPTOM
Page 20 of 23
REASON/CORRECTIVE ACTION
The characters only appear on half of the display.
The display lights appear to work but does not respond to button activation.
Press the “WEIGH” button or remove one battery.
Wait five seconds, then re-install the battery and try the “WEIGH” button again.
Button may not have “bounced” back up after being pressed. Remove the label facing and inspect buttons. Make sure the rubber “boot” is not sitting too high. Re-attach label.
The display shows no reading at all.
Check to ensure batteries are installed correctly (see directions for BATTERY REPLACEMENT).
Check transducer and readout cables to make sure they are connected securely.
The display reads “WEIGHT
OVERLOAD”.
Check to ensure the transducer wire is intact. A broken transducer wire or a bad T-Boom cable can cause this reading.
The display shows a double weight reading.
This happens when the IC5 fails. For repair information see INITIALIZATION PROCE-
DURE.
The pump could stay in the upright position until a downward force is applied.
This is acceptable behavior and is not considered a warranty issue. It could take up to 30 lbs. of downward force to lower the boom arm.
If, when boom is moved downward, there are “sticking” points where the force to lower is much greater and downward motion is erratic and not smooth.
This type of scenario implies that there could be air bubbles trapped in the system that could have been created by (a) Closing the Lock/Release Lever Arm and forcing the pump handle upward without using the pump handle and/or (b) during the shipping process. Possible Remedy: Please try the following:
(1) Close the Lock/Release Lever Arm and use the pump handle to raise the boom until it stops, (2) open the Lock/Release Lever Arm and slowly lower the boom arm with the required force until the boom stops, (3) repeat steps (1) and (2) two more times.
A small amount of hydraulic oil (about) a drop will accumulate around the piston from time to time and is normal.
This is not a warranty issue and the oil may be removed with a facial tissue.
For additional information or assistance, telephone our Service Hotline: 1-800-654-6360 or e-mail: [email protected]
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628 Page 21 of 23
WARRANTY
2 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 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. 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: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
NOTES
Page 22 of 23
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
Model SR255 Daily-Weigh
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_130628
S
By
SInstruments, Inc.
Page 23 of 23
Precision & Technology in
Perfect Balance
®
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL: www.srscales.com
email: [email protected]
Copyright 2013
SInstruments, Inc.
advertisement
Key Features
- Accurate weight readings
- Load cell technology
- Portable
- Easy-to-use controls
- Durable construction
Frequently Answers and Questions
What is the maximum weight capacity of the SR255 Daily-Weigh Scale?
How do I zero the SR255 Daily-Weigh Scale?
How do I change the weight units on the SR255 Daily-Weigh Scale?
What does the "HOLD" button do on the SR255 Daily-Weigh Scale?
Related manuals
advertisement
