179 



LEFT 



VALVE 



MOTOR 



r 



ELECTRODE 



SELECTOR 



RELAY 



REFERENCE 

 POTENTIAL 



MIXER 



RCSERVOm 



SERVO 

 AMPLIFIER 



'a. 



ANTI-BACK 

 TITRATE 

 SWITCH 



50. 



CONTROL RELAY 



LEFT 

 (MAS TER) 



T 



R I G H 



115 VOLT &C LiNF 



MASTER 



CONTROL 



SWITCH 



-AgNOj 



THREADED 

 PLUNGER 



Fig. 6. Block diagram, Automatic Chloriiiity Titrator, showing Servo System 

 and Right Titration Unit. 



