The SEMTECH-LAMBDAMASTER has been designed to meet the needs of automotive engineers through the next decade, when emphasis will be placed on very fast (less than 100msec. response) monitoring or air fuel ratio values.  In addition, instruments in the past have been both complicated and bulky as well as often needing much operator and service involvement, the design of the SEMTECH-LAMBDAMASTER offers both compactness and pure simplicity of operation which is achieved by the integration of a state-of-the-art transducer with a sophisticated microprocessor.

The Microprocessor
 

The microprocessor controls, monitors and interacts with the transducer and calculates oxygen equivalence ratio and air fuel ratio values.  Every 4msec the values of oxygen, pressure and temperature are updated, with each update being an average of four readings.  It controls the power to the transducer heater and maintains a temperature of 710ºC. 

The Transducer
 

The transducer is of unique design incorporating three sensors for oxygen, pressure and temperature as well as sonic jeweled orifices and filters.  The only connections to the sensor are the vacuum source and the power and signal cables.  Because of the very fast response requirements, the transducer operates under vacuum and contains exceptionally low dead volume.  The sample flow is nominally 500ccs/min and the speed of response is less than 100msec.   Access to the sample filter is quick and simple and involves no major disassembly of the transducer.  User maintenance is only limited to the routine changes of the filter and periodic cleaning of the sample and bypass orifices.