The weighing system with loading cells is designed to transform any hospital bed in a bed scale. It’s suitable to receive beds of any typology and marks. Katia is a medical device for the weight determination in medical procedure for the weighing of the patients for control, diagnosis and treatment reasons. The weighing system,constituted by 4 load sensors, is all made in stainless steel AISI304 and aluminum. Each estensimetric loading cell has a max load kg 150 with an overload of 100%. The device has a digital weight display. The keyboard has a protective membrane in polycarbonate surface. The system has a routine which performs the control of the weight loss during the dialysis session and generates alarms (accessory AC26).