Patent ID: 8852414

Claim:
A system having one or more sensors for measuring one or more parameters, comprising: a. a sensor to measure a characteristic of a reaction, and having an output to transmit information about said characteristic, said sensor output being a voltage between 0 and 10V b. a device to receive information corresponding to a characteristic of said reaction, comprising two leads and a voltage source providing a polarizing voltage of 600 to 800 mV between said leads, wherein said received information comprises a current in the range of 0 to 100 nA between said two leads; and c. an interface module, comprising an input port in communication with said output of said sensor and a first output port in communication with said leads on said device, comprising: an analog to digital converter in communication with said output of said sensor via said input port, for converting said output to a first digital value, indicative of said sensor output; a microprocessor in communication with a storage element comprising code, tables or software, which, when executed, converts said first digital value to said second digital value; a digital to analog converter for converting said second digital value to an analog voltage, said analog voltage indicative of a current to be provided to said device betweens said leads; a FET transistor, and a circuit for creating a gate voltage for said FET transistor, based on said analog voltage, wherein said FET transistor comprises two terminals disposed between said two leads, such that current between said two leads flows through said FET transistor, and wherein resistance between said terminals is determined based on said gate voltage and said current is in the range of 0 to 100 nA.