SR Scales Daily-Weigh SR255 Operating And Service Manual

Model SR255 Daily-Weigh Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_110921 Page 1 of 22

S

by SInstruments, Inc.

Model SR255

Daily-WeighScale

Operating and Service

Manual

Serial Numbers: 3616 +

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

Tel: [phone] Fax: [phone] URL: www.srscales.com

email: [e-mail]

Copyright 2011 SInstruments, Inc.

Model SR255 Daily-Weigh Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_110921 Page 2 of 22

TABLE OF CONTENTS

TABLE OF FIGURES ......................................................................................................................3

PACKING CHECKLIST – SR255– ADULT .................................................................................4

PACKING CHECKLIST – SR255 – PEDIATRIC .......................................................................5

ASSEMBLY.......................................................................................................................................6

REPLACEMENT PARTS AND ACCESSORIES ........................................................................8

SYSTEM DESCRIPTION AND INTENDED USE .......................................................................9

MAINTENANCE AND CLEANING ..............................................................................................9

STORAGE AND TRANSPORTATION ......................................................................................10

SPECIFICATIONS.........................................................................................................................11

BUTTON FUNCTIONS .................................................................................................................12

BASIC SYSTEM OPERATION ....................................................................................................12

BATTERY REPLACEMENT .......................................................................................................15

THEORY OF OPERATION .........................................................................................................16

CALIBRATION ..............................................................................................................................17

INITIALIZATION .........................................................................................................................18

TROUBLESHOOTING .................................................................................................................19

WARRANTY...................................................................................................................................20

NOTES .............................................................................................................................................21

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

Tel: [phone] Fax: [phone] URL: www.srscales.com

email: [e-mail]

Copyright 2011 SInstruments, Inc.

Model SR255 Daily-Weigh Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_110921 Page 3 of 22

TABLE OF FIGURES

Figure 1: Assembled SR255 Daily-Weigh Scale ......................................................................... 6

Figure 2: Stretcher Cup Installed .................................................................................................. 6

Figure 3: Mast Placement and Screw ............................................................................................ 7

Figure 4: Spreader Bar Connected in Receptacle ........................................................................ 7

Figure 5: T-Boom - Lifter Pump Connection ............................................................................... 7

Figure 6: Transducer Connected to T-Boom ............................................................................... 7

Figure 7: Transducer Cable Connection ...................................................................................... 7

Figure 8: Transducer - A-Frame Connected ................................................................................ 7

Figure 9: Velcro End of Stretcher Bar Channel on Stretcher ................................................. 8

Figure 10: A-Frame Hook Placement on Stretcher ..................................................................... 8

Figure 11: Stretcher Cup Receptacle for Transporting Scale .................................................. 10

Figure 12: Lifter Legs Opened/Closed ........................................................................................ 13

Figure 13: Lifter LOCK/ RELEASE Lever .................................................................................. 14

Figure 14: Battery Compartment Cover .................................................................................... 15

Figure 15: PC Board Access Cover ............................................................................................. 17

Figure 16: Location of Internal Calibration Buttons and Offset Potentiometer .................... 17

Figure 17: Location of Internal Initialization Buttons .............................................................. 18

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

Tel: [phone] Fax: [phone] URL: www.srscales.com

email: [e-mail]

Copyright 2011 SInstruments, Inc.

Model SR255 Daily-Weigh Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_110921 Page 4 of 22

PACKING CHECKLIST – SR255– ADULT

DESCRIPTION QUANTITY



Box 1

T-BOOM / MAST with INVACARE LIFTER 1 ea
1/4-20 x 1” SOCKET HEAD CAP SCREW (for Mast Assy.) 1 ea
INVACARE LIFTER BASE 1 ea
3/8-16 x 1 ¼” SHOULDER BOLT (for T-Boom/Pump Assy.) 1 ea
WASHER (for T-Boom/Pump Assy.) 1 ea
3/8-16 LOCK NUT (for T-Boom/Pump Assy.) 1 ea
SPREADER BAR 1 ea
TRANSDUCER TUBE 1 ea

6-32 x ½” SOCKET HEAD CAP SCREW (Safety Screw­Transducer Assy.)

2 ea

STAPH-CHECK STRETCHER (32” x 72”) 1 ea
STRETCHER CUP 1 ea
DISPLAY / BATTERY BOX (pre-attached to mast) 1 ea
SIX (6) “D” CELL BATTERIES 6 ea
A-FRAME 2 ea
3/8-16 x 2 ¼” SHOULDER BOLT (for A-Frame Assy.) 2 ea
3/8-16 LOCK NUT (for A-Frame Assy.) 2 ea
3/16” ALLEN WRENCH 1 ea
7/64” ALLEN WRENCH 1 ea
½” OPEN END WRENCH 1 ea

Box 2

STRETCHER BARS (72”) 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: [phone] Fax: [phone] URL: www.srscales.com

email: [e-mail]

Copyright 2011 SInstruments, Inc.

Model SR255 Daily-Weigh Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_110921 Page 5 of 22

PACKING CHECKLIST – SR255 – PEDIATRIC

DESCRIPTION QUANTITY



Box 1

T-BOOM/MAST with INVACARE LIFTER 1 ea
1/4-20 x 1” SOCKET HEAD CAP SCREW (for Mast Assy.) 1 ea
INVACARE LIFTER BASE 1 ea
3/8-16 x 1 ¼” SHOULDER BOLT (for T-Boom/Pump Assy.) 1 ea
WASHER (for T-Boom/Pump Assy.) 1 ea
3/8-16 LOCK NUT (for T-Boom/Pump Assy.) 1 ea
SPREADER BAR 1 ea
TRANSDUCER TUBE 1 ea

6-32 x ½” SOCKET HEAD CAP SCREW (Safety Screw­Transducer Assy.)

2 ea

STAPH-CHECK STRETCHER (32” x 60”) 1 ea
STRETCHER CUP 1 ea
DISPLAY / BATTERY BOX (pre-attached to mast) 1 ea
SIX (6) “D” CELL BATTERIES 6 ea
A-FRAME 2 ea
3/8-16 x 2 ¼” SHOULDER BOLT (for A-Frame Assy.) 2 ea
3/8-16 LOCK NUT (for A-Frame Assy.) 2 ea
3/16” ALLEN WRENCH 1 ea
7/64” ALLEN WRENCH 1 ea
½” OPEN END WRENCH 1 ea

Box 2

STRETCHER BARS (60”) 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: [phone] Fax: [phone] URL: www.srscales.com

email: [e-mail]

Copyright 2011 SInstruments, Inc.

Model SR255 Daily-Weigh Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_110921 Page 6 of 22

ASSEMBLY

4

3

5

1

2

6

12

7

4

8

10

9

11

13

14

15

15

15

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: [phone].

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

Invacare Lifter Base

1

Spreader Bar

2

Display Unit

3

Stretcher Bracket

4

T-Boom (Mast Hinge Connection)

5

Transducer Bar (T-Boom

6

Connection)
Lifter Pump (T-Boom Connection)

7

A-Frame (Stretcher Holders)

8

A-Frame Hook (Stretcher Bar)

9

Stretcher

10

Stretcher Bar Channels

11

Mast

12

Mast Anchor Screw

13

¼-20x1 Socket Head Cap Screw

14

Stretcher Cup

15

Figure 2: Stretcher Cup

Installed

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

Tel: [phone] Fax: [phone] URL: www.srscales.com

email: [e-mail]

Continued next page

Copyright 2011 SInstruments, Inc.

Model SR255 Daily-Weigh Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_110921 Page 7 of 22

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

Figure 5: T-Boom - Lifter

Pump Connection

Figure 7: Transducer

Cable Connection

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/T­Boom hinge lock nut securely.

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) 3/8­16 locknuts. Tighten securely.

Figure 4: Spreader

Bar Connected in

Receptacle

Figure 6: Transducer
Connected to T-Boom

Figure 8: Transducer -

A-Frame Connected

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

Tel: [phone] Fax: [phone] URL: www.srscales.com

email: [e-mail]

Continued next page

Copyright 2011 SInstruments, Inc.