Regardless of patient position, chair scales are designed to provide accurate weight readings.
These chair scales are used for routine weighing of patients who are disabled, elderly, or weak, and therefore cannot stand on a conventional scale.
To measure body fluid gain and loss during dialysis, specialized chair scales should monitor patient weight continuously and accurately over several hours with negligible drift.
Weighing chairs may use two basic types of weighing mechanisms: mechanical and electronic.
In the weighing chair’s mechanical scales there's a beam-balance configuration in which a lever arrangement transmits forces from the floor platform to the beam.
Weight is sensed directly in the electronic scales by means of transducers in the weighing chair platform.
There are also electromechanical units, in which the patient's weight causes a mechanical deflection, which is transmitted by a beam to a linear variable differential transformer, which then produces a voltage in proportion to the deflection of the beam.

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