Wideband Controller - Accurate Lambda Meter - ALM

ALM-Inline - Wideband Controller with Bosch LSU4.9 Sensor and Sensor Boss

ALM (Accurate Lambda Meter) from EcoTron is an air-fuel-ratio (AFR) meter which uses the Bosch LSU4.9 or LSU ADV wideband oxygen sensor to accurately measure the AFR or lambda for variant combustion engines, or to simply measure the oxygen concentration of variant exhaust gases.

ALM-inline is the smallest version with an enclosure is so small and slim, and it is seamlessly integrated with the cable, that you may not even notice there is a controller.

It is part of the cable, and therefore named as “inline”.

ALM-inline has the full function of a wideband controller, and the only thing it needs is 12V power supply.

Based on the Bosch CJ125 chip.

It measures the O2 concentration accurately, and converts it to either lambda, or AFR, as you want. It controls the LSU 4.9 sensor temperature in a close loop mode, accurately at 780 C degrees.

ALM-inline outputs the lambda measurement using the 0-5V analog voltage.

These are custom programmed especially for us to give output range as follows

0 volt Output = Lambda 0.68
5 volt Output = Lambda 1.36

Our package includes
ALM Inline Controller programmed for Lambda 0.68 to 1.36
Bosch LSU 4.9 sensor
Stainless plug and bung

ALM-Inline technical specifications

Power supply
Input voltage range　　　　DC 12V for the Inline, 12V for the O2 sensor
Input current　　　　　　　60mA typical for the Inline; the heater current directly from 12V supply

Sensors
Standard configuration　　　LSU 4.9 (Support LSUADV;
　　　　　　　　　　　　　　LSU 4.2 capable but not recommended)
Number of Sensors　　　　　One
Free air calibration　　　　No need

Accuracy
Range of measurement　　　　λ = 0.68 to 1.36
Measurement accuracy　　　　±0.008 @ λ=1.00
　　　　　　　　　　　　　　±0.01 @ λ=0.80
　　　　　　　　　　　　　　±0.05 @ λ=1.70
Air/Fuel Ratio　　　　　　　Fuel dependent (see lambda range and accuracy)
Range of O2%　　　　　　　　-21% ~ 21%

Response time
5ms updating rate
0-5v analog output in 5ms updating rate;

Heater
Control　　　　　　　　　Built-in PID control with CJ125
Current　　　　　　　　　Typical 1A;Peak 3.5A
Heater return (H-)　　　　Separate wire from Ground

Output
Lambda analog output　　　　0 ~ 5V analog the user can set
Analog accuracy　　　　　　　±0.005V error with a 10-bit DAC chip

Communications
SCI communications(option)

Main-Processor
CPU　　　　　　　　　Freescale MC9S12P128 16-bit micro-processor (Automotive level)
Speed　　　　　　　　32MHz
Memory　　　　　　　　128k Flash, 6k RAM, 4k Data

General
Temperature range　　　　-40oC ~ 85oC
Dimensions　　　　　　　　3.64″ x 1.18″ x 0.87″