Hi guys. I spent some time yesterday learning how to calculate and check for PAR. Today, I ran the same test piece that I have been, only this time "watching" for PAR. The good part is, the end result was MUCH better then it has yet been since I switched to the LCD method. The bad part is....im not sure why I got the results I did. Id like your thoughts on.......well, everything.
Part size- 1.5x2.75x.375
I calculated 11.4375 sq.in.(.07943 sq.ft.). I then calculated that I would need .357A(at 4.5/sq.ft.). I am using a .1175ohm(4 .47ohn resistors in parallel) "current sensing" resistor......so I calculated that I need .042V across my resistors.
Additional things that calculated this time.....
PAR= 31.48ohms
PAR voltage= 11.24V
Other needed to know things...
ano tank temp= 68degrees
dye temp= 140degrees
I recorded the voltage from cathode to anode at random times throughout the process today. Im not using a CC power supply, and the current didnt stabilize before the 2 minute mark, so thats where I started.
2 minutes- 11.6V
6 minutes- 11.81V
11 minutes- 12.22V
20 minutes- 12.30V
35 minutes- 12.47V
47 minutes- 12.70V
52 minutes- 12.90V
1:23 minutes- 13.16V
1:40 minutes- 13.40V
1:53 minutes- 13.50V
2:00 minutes- 13.50V
2:30 minutes- 13.50V
After it stayed at 13.50V for over a half hour, I figured that it was at PAR and would EVENTUALLY drop in voltage. I dyed the part red and it turned out a nice deep red. Red has been the color that has been giving me more problems then anything else, and the Ph of my red dye is supposedly too high to work properly. I was doubting it was the dye due to the fact that it was only used once before, and I always rinse really well between tanks. I was about to replace it actually...and still may just to see what new red dye actually measures.
Anyhow, did I do my calculations correctly? Why was my ending voltage 13.50V when it should have been 11.24V? Why did PAR take an extra half hour to reach(2 hours)? Thanks for any input guys!
Part size- 1.5x2.75x.375
I calculated 11.4375 sq.in.(.07943 sq.ft.). I then calculated that I would need .357A(at 4.5/sq.ft.). I am using a .1175ohm(4 .47ohn resistors in parallel) "current sensing" resistor......so I calculated that I need .042V across my resistors.
Additional things that calculated this time.....
PAR= 31.48ohms
PAR voltage= 11.24V
Other needed to know things...
ano tank temp= 68degrees
dye temp= 140degrees
I recorded the voltage from cathode to anode at random times throughout the process today. Im not using a CC power supply, and the current didnt stabilize before the 2 minute mark, so thats where I started.
2 minutes- 11.6V
6 minutes- 11.81V
11 minutes- 12.22V
20 minutes- 12.30V
35 minutes- 12.47V
47 minutes- 12.70V
52 minutes- 12.90V
1:23 minutes- 13.16V
1:40 minutes- 13.40V
1:53 minutes- 13.50V
2:00 minutes- 13.50V
2:30 minutes- 13.50V
After it stayed at 13.50V for over a half hour, I figured that it was at PAR and would EVENTUALLY drop in voltage. I dyed the part red and it turned out a nice deep red. Red has been the color that has been giving me more problems then anything else, and the Ph of my red dye is supposedly too high to work properly. I was doubting it was the dye due to the fact that it was only used once before, and I always rinse really well between tanks. I was about to replace it actually...and still may just to see what new red dye actually measures.
Anyhow, did I do my calculations correctly? Why was my ending voltage 13.50V when it should have been 11.24V? Why did PAR take an extra half hour to reach(2 hours)? Thanks for any input guys!
Comment