Model SR725
i
Wheelchair Scale
Operating and Service Manual
Part No. MAN725
i
_MICROBAN_200603
Page 18 of 24
S
Instruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL:
email:
Copyright 2020
S
Instruments, Inc.
LOW
LIMIT
APPLIED
LOAD
HIGH
LIMIT
99.9
100.0
100.1
199.8
200.0
200.2
299.7
300.0
300.3
399.6
400.0
400.4
499.5
500.0
500.5
599.4
600.0
600.6
699.3
700.0
700.7
799.2
800.0
800.8
899.1
900.0
900.9
999.0
1000.0
1001.0
CALIBRATION
TOLERANCE TABLE
CALIBRATION
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.
CHECKING CALIBRATION
STEP 1:
Select two (2) known calibrated weights, traceable to
NIST.
NOTE:
The first weight should be at least 500 pounds (half of
the maximum scale capacity). The second weight should be less
than half of the first weight.
DO NOT USE
barbells or un-
calibrated weights.
STEP 2:
Zero the scale by pressing and holding
ZERO /
WEIGH
button.
STEP 3:
Place the first calibrated weight on the scale. Wait for
scale to stabilize; note scale reading. Remove weight.
STEP 4:
Place second calibrated weight on scale. Wait for
scale to stabilize; note scale reading. Remove weight.
STEP 5:
The scale readings for both weights should be within the
Calibration Tolerance plus or minus one digit of display
resolution (Figure 10).
Figure 10: Calibration Tolerance Table
Figure 11: Calibration Switch Diagram
Continued next page
IMPORTANT
CALIBRATION Qualified service personnel only should perform this procedure. The
SR725
i
/ SR725
i
-L 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 SWITCH