22 



c. Connect the second wire to the silver wire extending from 

 the digital counter and to one of the black wires connected 

 to the counter (c). 



6. Connect the remaining black wire from the digital counter to 

 the remaining negative lead of the 9V battery (d), then solder 

 and cover with a wire connector. 



7. Squeeze the sides of the digital counter plastic housing and 

 insert wires and batteries. Cover the base of the counter with 

 electrical tape to secure the batteries and wires in the counter 

 housing. 



Operational Check of the Digital Rain Gauge and 

 Rain-intensity Relay and Trouble- shooting 



1. Manually rock the tipping bucket from side to side. Each 

 time the bucket tips, the digital counter should advance one 

 digit and the rain-intensity pen arm should respond with a 

 'clicking' sound as the pen arm moves downward and 

 returns immediately to its original position. 



2. If either event fails to occur, trouble-shoot as follows: 



a. Check the tipping bucket to make sure the magnetic bead 

 is close enough to the magneswitch to connect the metal 

 strips as the bead swings by. You should hear a 'clicking' 

 sound when the metal strips make contact. 



b. Check all wiring to make sure all parts are wired correctly 

 and all connections are secure. 



c. Test the 9V batteries to make sure they are fully charged. 



d. Check the pen arm to make sure it is not pressed too 

 tightly against the drum. 



e. Check the gap on the rain-intensity pen arm relay. It may 

 be necessary to reduce the gap by turning the gap adjust- 

 ment screw clockwise. 



Calibrating the Digital Rain Gauge (refer to Fig. 3) 



The digital rain gauge is calibrated at the factory to within 5.0% 

 accuracy, but it is advisable to check the instrument periodically to 

 insure that it is calibrated to record each 0.25 mm of rain. Proceed as 

 follows: 



1. Remove the collector, making sure that the tipping bucket 

 assembly is on a level surface. 



2. Turn the two "B" adjusting screws clockwise one turn or to 

 seat (whichever comes first). 



3. Rock the tipping bucket from side to side to make sure it is 

 free and settles solidly on the upright or on screw "B" on 

 each side. The tipping bucket must not 'float' upward after 

 hitting screw "B". 



