Pre-calibrated replaceable sensor module for a breath alcohol testing device

A breathalyzer, comprising:

• a signal processing unit;
• a breath sampling tube;
• a pre-calibrated replaceable alcohol sensor module configured to operate upon installation in said breathalyzer without requiring calibration of said breathalyzer, comprising:
• a printed circuit board (PCB);
• a breath alcohol sensor removably attached directly to said breath sampling tube of said breathalyzer to receive a breath air sample and to measure percent blood alcohol concentration (% BAC) based on analysis of the breath air sample;
• a non-volatile memory unit for storing pre-calibrated data of said breath alcohol sensor module;
• and
• an electronic circuitry mounted on said PCB and operable to transmit measured BAC from said breath alcohol sensor to said signal processing unit of said breathalyzer and operable to transmit said pre-calibrated data of said breath alcohol sensor module from said non-volatile memory unit to said primary signal processing unit of said breathalyzer to provide accurate measurement of said breath air sample;
• an interface to electronically connect said pre-calibrated replaceable alcohol sensor module to said signal processing unit;
• a display for displaying the % BAC to a user;
• and
• a housing to house said signal processing unit, said pre-calibrated replaceable alcohol sensor module, said display, said breath sampling tube and said interface.

A method of maintaining a breathalyzer having a pre-calibrated replaceable breath alcohol sensor module in a calibrated state, comprising the steps of:

• determining if said pre-calibrated replaceable breath alcohol sensor module requires replacement, said pre-calibrated replaceable breath alcohol sensor module comprising:
• a printed circuit board (PCB);
• a breath alcohol sensor configured to removably attach to a breath sampling tube of said breathalyzer to receive a breath air sample and to measure blood alcohol concentration (BAC) based on analysis of the breath air sample;
• a non-volatile memory unit for storing pre-calibrated data of said breath alcohol sensor module;
• and
• an electronic circuitry mounted on said PCB and operable to transmit measured BAC from said breath alcohol sensor to a primary signal processing unit of said breathalyzer and operable to transmit said pre-calibrated data of said breath alcohol sensor module from said non-volatile memory unit to said primary signal processing unit of said breathalyzer to provide accurate measurement of said breath air sample;
• and
• replacing said pre-calibrated replaceable breath alcohol sensor module with another pre-calibrated replaceable breath alcohol sensor module after being used for a pre-determined number of times;
• wherein said pre-calibrated replaceable alcohol sensor module is configured to operate upon installation in said breathalyzer without requiring calibration of said breathalyzer.