Model SR555
i
Series Stand-On Scale
Operating and Service Manual
Part No. MAN555
i
-KG_MICROBAN_201001
Page 16 of 22
S
Instruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL:
www.srscales.com
email:
Copyright 2020
S
Instruments, Inc.
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 known calibrated weights, traceable to NIST.
NOTE:
The weights should total at least 227 kilograms (half of the
maximum scale capacity). Put aside a subset of weight that is less than
half of the combined weight.
DO NOT USE
barbells or uncalibrated
weights.
STEP 2:
Zero the scale by pressing and holding
ZERO / WEIGH
button.
STEP 3:
Place the subset of calibrated weight on the scale. Wait for
scale to stabilize; note scale reading.
STEP 4:
Place all of the 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 Table
(Figure 9).
KILOGRAM CALIBRATION
TOLERANCE TABLE
LOW
LIMIT
APPLIED
LOAD
HIGH
LIMIT
50.0
50.0
50.1
99.9
100.0
100.1
199.8
200.0
200.2
299.7
300.0
300.3
399.6
400.0
400.4
453.5
454.0
454.5
Figure 10: Calibration Switch Diagram
IMPORTANT
CALIBRATION Qualified service personnel only should perform this procedure. The
SR555
i
-KG 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
Continued next page
Figure 9: Kilogram Calibration
Tolerance Table