Measure the sensor check has been made up as 0.00 mg/L, so the check reveals that the lower SAC has been entered in the equation, so Adjust the sensor value equation to measure BOD values are normal.
Have checked the sensor measurement is 0.00 mg / L, so check that the SAC is entered in the equation below Adjust the sensor so the equation is usually measured by the BOD.
The check sensor measure is 0.00 mg / L is checked, it was found that the lower SAC equation entered in sensor was Adjust. The new equation, the BOD measured as normal.