e) Place the rotary switch on the relay cabinet to posi- 

 tion 5 (full-scale setting) . 



f) Adjust the linearity control on the front panel to the 

 relay cabinet to provide full-scale pen movement on the 

 strip-chart recorder. 



g) Move the rotary switch to its intermediate calibrate 

 positions and mark strip-chart recorder accordingly. 



h) Check strip-chart recorder for linearity. If recording 



is not linear, adjust d.c. voltage of the regulated power 



module either up or down and repeat steps e, f, g, and 

 h until linearity is obtained. 



i) Place rotary switch in "operate" position. 



j) Place the toggle switch marked "calibrate-operate" to 

 the "operate" position. 



k) Raise or lower the epoxy gage sections in the water, 



and observe the strip-chart recording for a correspond- 

 ing indication. 



A relay that is stuck closed will cause the recorder 

 pen to remain at an up-scale position when all gage 

 sections are removed from the water. A relay that 

 does not close will be indicated by a jump in the 

 recorder pen as the gage sections are lowered into 

 the water. The terminal strip on the rear of the 

 power-supply unit allows for adjustment of the voltage 

 applied to the relay circuit. Salt-water locations 

 require 9 to 12 volts for normal operations. Set 

 voltage to the lowest value that will provide positive 

 relay action and best relay fallout when the gage sec- 

 tions are raised and lowered in the mount. A d.c. 

 voltmeter may be used to measure the d.c. voltage 

 across a relay coil that is in a closed position; this 

 voltage should be about 5.5 to 6.5 volts. Greater 

 relay voltage will cause the relays to remain closed 

 when the gage sections are saturated with water, but 

 with the gage contact out of water. This is due to 

 conductivity of water film on the gage section. 

 Excessive voltage will cause capacitor failure in 

 the relay circuit. 



1) Adjust programmer to time recordings from the gage as 

 desired. The programmer will provide a recording at 

 the beginning of each hour for the selected number of 



61 



