Relay 



I^XXAAA^* 



Ground Rod 



Cr-rry-Y^ jn Water 

 Power 



Water Contact 

 Water Surface 



Figure 25. Simplified diagram of relay-type, step-resistance gage. 



Silicon Rectifier 

 INI692 



r-*f 



50MFD 

 50 V 

 ♦ • 



Relay 



Pull in 5 volts 

 6MA± IMA 

 Drop out above 35 

 ampere turns 



^ 



28 Volt - .07 omp. lamp 



1100 ohms 

 1/2 wott 



6 to 24 V. odjustable 



ry-'rYyy-\ 



115 Volt 

 60 Cycle 



Gage Ground 

 Rod ^^-^ 



I I 



Water Contocf 



Wofer Surface 



Figure 26. Modified circuit for relay-type, step-resistance gage. 



46 



