Motec AFM1 User Manual download pdf (Page 7)

MoTeC Meter Operation 3

Meter Operation

Introduction

The M oTe C 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 M oTe C Engine Management Systems for

transmission over the M oTe C 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.

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Motec AFM1 User Manual Page 7