The sulfur oxide monitoring device 62 sends {HEAD ~ a signal} to {TAIL ~ controller} 64 wherein this signal is compared to a set point signal 66, which in this case would represent a preselected sulfur oxide emission level known to be below that required by local air pollution regulations 
The sulfur oxide monitoring device 62 sends { HEAD ~ a signal } to { TAIL ~ controller } 64 wherein this signal is compared to a set point signal 66 , which in this case would represent a preselected sulfur oxide emission level known to be below that required by local air pollution regulations
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH