Tanita 4521 Operator'S Manual Download Page 6

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Calibration

Note:

Your scale has been accurately calibrated at the

factory. However, there is always a possibility that the
calibration changed due to jarring during shipping. The
following procedure should be followed to check and/or
correct any error in calibration.

1. Depress On/Off switch on scale and wait for a display

of “0.”

2. Place an accurately known weight on the platform.

3. If display is other than known weight, then the scale is

out of calibration.

4. Remove the upper 2 screws from each side of the

control panel. Slightly loosen the bottom 2 screws on
each side,

but do not remove

. Lift off the top portion

of the head.

Be careful, since it is attached to the

bottom portion with a ribbon cable.

You will see 2

small adjustment screws toward the front of the control
board. The left metal screw is for coarse adjustments;
it adjusts for large errors. The right plastic screw is for
fine adjustments; it adjusts small errors.

5. Turn the metal coarse calibration screw in small

increments,

CLOCKWISE to increase weight or

COUNTERCLOCKWISE to decrease weight.

In most

cases, this is the only adjustment needed.

6. If necessary, make adjustments with the plastic fine

adjustment screw (right).

CLOCKWISE to decrease

weight; COUNTERCLOCKWISE to increase weight.

7. Remove weight and depress Zero switch. Wait for a

display reading of “0.” Again add known weight to
platform. If reading is correct, no further adjustments
are necessary. If reading is incorrect, repeat steps 5
and 6 until correct reading is obtained.

NOTE:

The

Top Knob

is for fine adjustment and the

Bottom Knob

is for coarse adjustment. The fine

adjustment knob works opposite of the coarse
adjustment knob—CLOCKWISE if too heavy and
COUNTERCLOCKWISE if too light.

Taking a Weight Measurement

1. Once the chair weight has been zeroed out and the

display reads “0,” have the patient sit on the chair.

2. The moving dashes will lock in and display the

patient’s actual weight.

3. Weight measurement should automatically be

displayed on the control panel box console.

• Measurement automatically defaults to pounds.

If kilograms are required, push the Kilos switch.

• If a reweigh is required, depress the Zero switch.

4. Excessive movement may prevent a repeatable

reading. In this case, a series of moving dashes
continues to appear on the console rather than a
weight reading. If moving dashes persist, activate the
“Average Lock” by depressing the appropriate Pounds
or Kilos switch to obtain an average reading of the
patient’s weight.

Note:

This reading is now an average of weights that

the computer calculates.

5. After weight measurement is obtained and recorded,

have the patient stand up off the chair and step away
from the scale.

6. Depress the On/Off switch to turn the scale off.

CARE AND MAINTENANCE

Proper care and cleaning of all Tanita Corporation scales
and accessories is essential to ensure a long life of
accurate and effective operation. In addition to routine
cleaning, include a regular check of all structural
apparatus to ensure stability.

Cleaning

Disconnect scale from 120 VAC before cleaning.

1. All external surfaces can be wiped clean with a damp

cloth. Mild soap and water solution may be used. Wipe
unit dry with a clean, soft cloth.

DO NOT

immerse control panel box into cleaning or