While many wideband controller manufacturers are still using the LSU4.2 sensors for their flagship products, EcoEFI ALM took the lead to move to the LSU4.9 sensor. The key difference that LSU 4.9 gets rid of is the air reference, which is the biggest failure mode, instead of that, a reference pumping current was introduced. As a result, LSU 4.9 has a long life and can maintain accuracy throughout life. Only since then, Bosch LSU sensors have been used widely in the auto industries. For more detailed information, please refer to Bosch LSU 4.9 is superior to LSU 4.2 sensors | News | EcoEFI

The highlights of new LSU 4.9 sensors: Thinner sensing element. LSU 4.2 is 1.5mm, while LSU 4.9 is only half of that. More accurate measurements and faster response. New design of protection tubes. Has a new design of the inner tube since sensing element is protected by a double layer tube. Improved gas flow, faster dynamic response. Significantly reduced thermal shock risk. Measuring the internal resistance and close loop control of the sensor temperature This is done with the CJ125 chip. By controlling the sensor temperature in the close-loop mode, can make the LSU sensor accurate. This is the fundamental difference between the LSU 4.2 and LSU 4.9. List of ALM-LSU 4.9 parts Rugged ALM controller built-in LED display (or other packages, contact us for details) Harness (1.5 meter default, 3 meter optional) Bosch LSU 4.9 sensor Sensor plug and bung Serial communication + USB adapter, Or CAN bus optional CD - documents and ALM GUI software ALM technical specifications Power supply Input voltage range: DC 9V~15 V(12V Typical) Input current: 50mA typical plus the heater current Voltage protection: Reverse polarity protected, & overvoltage protected Load Dump Clamp: Maximum voltage Sensors Compatible: LSU 4.9 Number of Sensors: One Free air calibration: automatic calibration available Measurement Lambda range: λ = 0.65 ~ ∞ Lambda accuracy: ±0.007 @ λ=1.00 ±0.01 @ λ=0.80 ±0.05 @ λ=1.70 Air/Fuel Ratio: Fuel dependent (see lambda range and accuracy) Response time 10ms updating rate (everything finished in 10ms) Heater Control built-in PID control with CJ125 Current Typical 1A; Max 1.5A Heater return (H-) Separate wire from Ground Output Lambda analog output: 0~5V user programmable Analog accuracy: ±0.005V error with a 10-bit DAC chip Analog type: Reference ground to ECU second Lambda analog output: 0~5V for a third party gauge, user programmable Communications advanced CAN bus communication (optional) RS232 or USB (via an adaptor) for logging or programming User-friendly PC software for data acquisitions and analysis Display 4 digit LED display including 2 digit floating numbers AFR, lambda, O2% configurable Main-Processor CPU: FreeScale 16-bit micro-processor S12P (auto industry rated) Speed: 32MHz Memory: 128k Flash, 6k Ram, 4k Data Load Dump Clamp Maximum voltage Special features On-Board-Diagnosis and error report Self-learning of part-to-part variations, aging effect Working with different types of fuels (gasoline, diesel, E85, etc) General Temperature range: -45C ~ +125 C (can be installed in the engine compartment) Dimensions: 4" x 2.6" x 1"