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Specifications
Dimensions
Height......................................................................2.5"
Width....................................................21.25" to 29.75"
Length ......................................................................31"
Weight (no package included) ..............................26 lb.
Power Requirements
Input Power ..........................................120 VAC/60 Hz
Operating Conditions
Temperature/Humidity ............................Normal Room
Temperature and Humidity
Scale Description
Type..........................................................Strain Gauge
Maximum Capacity ................................500 lb./227 kg.
Resolution................................................0.1 lb./0.1 kg.
Accuracy............................................± 0.1 lb./± 0.1 kg.
Maximum Zero Weight ..........................12.5 lb./5.6 kg.
OPERATING INSTRUCTIONS
As a Wheelchair Scale
When using the 4521 Wheelchair Scale, the weight of the
wheelchair must be taken into account. Weigh the
wheelchair by itself to determine its weight and then
subtract this weight from the combined weight of patient
and wheelchair.
IMPORTANT: Adjust platform height so it does not touch
the floor or carpet. An incorrect patient weight reading will
result if the ramp touches the floor or carpet. (See
Section “Leveling the Platform” on page 2.)
Weighing the Wheelchair
1. Place the control panel box away from the scale so
that the cables do not cross the platform rails.
2. Adjust the scale width by sliding the adjustable rail until
the wheelchair wheels line up with the platform rails.
(Fig. 4)
3. Turn scale on by depressing the On/Off switch. Wait for
the display to show “0.”
4. Roll the empty wheelchair onto the scale. Wait for the
moving dashes to lock in and display the weight of the
wheelchair.
5. Record the wheelchair weight.
6. Remove the wheelchair from the scale platform and
turn scale off.
Taking a Weight Measurement
1. Before wheeling patient onto scale platform, make
certain wheels line up with the platform rails. If they
need to be adjusted, repeat steps 1 and 2 under
“Weighing the Wheelchair” above.
2. Wheel the patient onto the scale platform. Then lock
the wheels to prevent rolling during weighing.
3. The moving dashes will lock in and display the weight
measurement.
• Measurement automatically defaults to pounds. If
kilograms are required, depress the Kilos switch.
• If a reweigh is required, depress the Zero switch.
4. Deduct the wheelchair weight from the displayed
weight to obtain the patient’s weight.
5. 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 an instantaneous average of
weights that the computer calculates.
6. After the weight measurement is obtained and
recorded, remove the patient from the scale.
7. Depress the On/Off switch to turn the scale off.
As a Chair Scale
When using the Wheelchair Scale as a Chair Scale, the
weight of the chair used to seat the patient on must be
taken into account. This is accomplished by weighing the
chair by itself to zero-out its weight.
Failure to correctly zero out the weight of the chair will
result in incorrect patient weight readings.
Weighing the Chair
1. Place the control panel box away from the scale so
that the cables do not cross the platform rails.
2. Adjust the scale width by sliding the adjustable rail so
the legs of the chair can rest on the platform rails.
3. Place the chair on the scale rails so the seat is directly
over the center beam.
4. Turn the scale on. The scale will zero out the weight of
the chair leaving a “0” on the display.
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Push “ON” button
and wait until zero
appears before
stepping on scale
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4
Fig. 4