An arrangement for installation of monitoring sensors of a treatment vessel for lignocellulosic material

A digester vessel oriented vertically and configured to continuously treat a lignocellulosic material, the digester vessel comprising:

• an outer wall defining an interior chamber configured to treat the lignocellulosic material flowing continuously down through the digester vessel from an upper inlet to a lower outlet for the material;
• a central pipe coaxial with the outer vessel and extending at least ten meters within the interior chamber, wherein the central pipe is configured to deliver liquor to the lignocellulosic material in the interior chamber;
• a sensor channel mounted to an outermost wall of the central pipe and extending at least ten meters in the interior chamber, wherein the sensor channel supports sensors arranged at various elevations within the digester vessel;
• a cable conduit extending from the sensor channel, through the interior chamber and to an outlet at or external to the outer wall;
• and
• at least one sensor cable connected to a respective one of the sensors and extending through the sensor channel and through the cable conduit, wherein the at least one sensor cable is configured to transmit signals generated by the sensors to a processor external to the digester vessel.