MoTeC AFM1 - Manual (Page 7)

MoTeC
Meter Operation 3
Meter Operation
Introduction
The MoTeC Air Fuel Ratio Meter measures Lambda (or Air Fuel Ratio) over a
wide range of mixtures with fast response time.
The display may be set to Show Lambda or Air Fuel Ratio for either Petrol,
Alcohol, Gas or Diesel.
The Meter provides an Isolated Analog Output Voltage proportional to
Lambda that may be connected to MoTeC Engine Management Systems for
transmission over the MoTeC Radio Link or closed loop control of Air Fuel
Ratio. Alternatively the Output may be connected to an Analog Meter or other
measurement instrument such as a Data Logger or Chart Recorder.
Sensor Placement
The sensor should be placed in the side of the exhaust system and should
protrude into the exhaust gas flow.
The sensor should be placed at least 1m from the exhaust ports to avoid
excessive heat and at least 1m from the open end of the exhaust system to
avoid incorrect readings due to outside oxygen.
The Sensor has an M18 x 1.5 Thread.
Sensor Life Time
The sensor life time is dependant on the type of fuel being used and the
volume of gas flow over the sensor.
Leaded fuel will reduce the sensor lifetime substantially due to lead
contamination of the sensor element.
The specifications give approximate lifetimes for Leaded and Unleaded fuel
for a typical high performance engine. Longer lifetimes can be expected for
less demanding applications.
Sensor Warm Up
The Sensor must be hot before any useful measurements can be taken.