When it is judged that the integral value exceeds {HEAD ~ a predetermined maximum value}, {TAIL ~ the controller} causes a display device to display the necessity of emptying the container 
When it is judged that the integral value exceeds { HEAD ~ a predetermined maximum value } , { TAIL ~ the controller } causes a display device to display the necessity of emptying the container
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH