Electrical liquid conductivity measuring system

A circuit for measuring the true value of a first parameter of a liquid sample of predetermined volume, the value of the first parameter being dependent on the true value of a second parameter of the liquid sample, said circuit comprising:

• generating means for generating an electrical signal;
• electrode means for passing said signal through said liquid sample;
• first monitoring means connected to said electrode means for monitoring said first parameter of said liquid sample;
• second monitoring means for measuring said second parameter;
• and
• compensating means responsive to said monitored first and second parameters for producing a signal indicative of the true value of said first parameter, said compensating means including computer means having a memory, said memory storing information relating to a predetermined range of true values of said first parameter, the specific one of said true values for conversion into a signal being determined by the monitored values of said first and second parameters.

An electronic device for measuring conductivity of a blood sample of predetermined volume, said device comprising:

• generating means for generating a signal of predetermined frequency;
• electrode means for passing said signal through said blood sample;
• first monitoring means for monitoring the conductivity of said blood sample;
• second monitoring means for monitoring the temperature of said blood sample;
• and
• means for comparing the temperatures monitored by said second monitoring means and for issuing a temperature signal when the difference between two successive monitored temperatures is less than a predetermined value.