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
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
Standard configuration LSU 4.9 (Support LSUADV;
LSU 4.2 capable but not recommended)
Number of Sensors One
Free air calibration No need
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%
5ms updating rate
0-5v analog output in 5ms updating rate;
Control Built-in PID control with CJ125
Current Typical 1A;Peak 3.5A
Heater return (H-) Separate wire from Ground
Lambda analog output 0 ~ 5V analog the user can set
Analog accuracy ±0.005V error with a 10-bit DAC chip
CPU Freescale MC9S12P128 16-bit micro-processor (Automotive level)
Memory 128k Flash, 6k RAM, 4k Data
Temperature range -40oC ~ 85oC
Dimensions 3.64″ x 1.18″ x 0.87″