The lambda sensor is the key sensor controlling the combustion process by measuring the remaining oxygen percentage in the flue gasses.
This sensor can be used as a direct replacement for Bosch LSM 11 sensors, as well as other 4 wire oxygen sensors (2x white wires, 1 x black, 1 x grey). The sensor comes with 20cm cable and a 4 pin female plug attached, this can be cut of and the wires joined to existing cabling. Alternatively, purchase the 2.5m cable with matching 4 pin male plug to run back to the control panel.
These sensors have been designed for use in biomass boilers and as a result are more resilient than many OEM sensors, which in many cases have been designed for use in cars. It is recommended to replace your oxygen sensor at least every 3 years or yearly if running at high load through the whole year to maintain optimal running of your plant.