Device for weighing a quantity of fluid in an extracorporeal blood treatment machine

A device for weighing a quantity of fluid in an extracorporeal blood treatment machine, the device comprising:

• a fastening unit configured to mount a container for the quantity of fluid on a frame element;
• a weighing sensor unit with a first measurement channel and a second measurement channel, the weighing sensor unit being configured to capture a first weight measurement value via the first measurement channel and to capture a second weight measurement value via the second measurement channel;
• and
• a control unit configured to determine a weight for the quantity of fluid in the container based on the first weight measurement value and the second weight measurement value,
• the weighing sensor unit being further configured to capture a first initialization weight measurement value via the first measurement channel and a second initialization weight measurement value via the second measurement channel in an unloaded state of the weighing sensor unit before weighing the quantity of fluid,
• the control unit being further configured to compare the first initialization weight measurement value with a first limit value and to compare the second initialization weight measurement value with a second limit value, and
• the control unit being further configured to:
• set the first initialization weight measurement value as an offset for the first measurement channel and set the second initialization weight measurement value as an offset for the second measurement channel when an amount of the first initialization weight measurement value is less than an amount of the first limit value, and when an amount of the second initialization weight measurement value is less than an amount of the second limit value, and
• output an error message when the amount of the first initialization weight measurement value is greater than the amount of the first limit value and/or when the amount of the second initialization weight measurement value is greater than the amount of the second limit value.