So I went and bought a REDOX and Salinity Probe

[TheBoober]

The Redox probe works flawlessly. I would like to say that it is reporting 330 mv, which I'm happy with. The salinity probe, however, is another matter. It normally runs @ 78 degrees between 35 and 36 ppt. Which equates to about 1.025 to 1.026 density. Then for no reason it will start reading about 34.3, which is way wrong. I then shake the probe and it jumps back to the 35 to 36 range. Also when I tell the profilux to convert to density, it always stays at 1.025. I know it should be 1.026 according to the ppt table given temp. I would think that it should at least go up as the days pass by. I really didn't want to use the ppt table, just want to get a quick glance of the density. Also since I installed the probes, the Profilux has hung up, no lights, just the sim sticks on and the display not cycling. Before this my unit had been working flawlessly for around 6 months. Any idea's ???

 

[AQD_ottawa]

I am out and about all week so have limited access for tech support, but my first thoughts would be.

Is it an EX unit?
Did you calibrate?

If you can answer this then matthias will respond in the morning with a more detailed response. Just wanted to reply now so you dont feel your question is being ignored

 

[TheBoober]

Its an EX model, has 8 L-ports, standard S-ports, Redox, PH, Temp, and Salinity Probe. When I got home from work I had an alarm. Salinity was 33.4, Wrong, shook the Probe in the water, 35.6. I'm only shaking the probe end, so the rest of the wires to the Profilux are un-disturbed.

 

[TheBoober]

Opps, and yes it was calibrated. In fact when it works the reading is fairly accurate. Except when in the density mode, PPT mode works OK.

 

[AQD_ottawa]

The probe when you got it was the rubber storage vessel still containing some fluid?

 

[Matthias Gross]

Hi

1. sounds like there is a bad contact in the cable, probe or BNC-connector
2. calculation of density, salinity, conductivity, etc.
-> we had many discussions so far about this topic, please use the search-function in this forum

 

[TheBoober]

To answer your question, yes the probe came submerged in the fluid in the plastic container. I will try to do some more trouble shooting on the probe. I will hold the probe and then move the wire back & forth to see if the value changes. Like I said I am only affecting the wire at the probe. The rest of the wire does not move. Therefore I feel that the BNC end is not effected. I did a search and got 2 other posts. One by Phxkeller around and one by recife111. Both posts didn't answer my question about density. What I'm saying is that I expect the density to rise over the course of two days. I lose about four gallons of water during that time and if I start at 1.025, my hydrometer reads close to 1.026 after losing the 4 gallons. The profilux still reads 1.025. If I tell the profilux to display PPT, using the Profilux temp displayed & the PPT displayed, then looking up the two on the table I have, I get close to 1.026. I would expect the Profilux to be able to convert this to the proper density or at least be closer than always displaying 1.025. Right now I just want to look at my Profilux and be able to see the density so I know how much water to throw in the tank. If its 1.0255 add 2 gal, if 1.026 4 gal.

 

[TheBoober]

Well I got home tonight and one of my dimmable ballast turned off, I have 4. Reset the Profilux and everything came on. This ballest is on L2. This unit has worked flawlessly for about 6 months before I bought the Redox and Salinity Probes. What gives? I might just turn off and unplug the probes and see what happens.

 

[AQD_ottawa]

sounds like salinity probe loose connection as Matthias stated.

Please mail me.

 

[Matthias Gross]

Hi

I am very sure that there is no relation between probes and ballast, these are complete different electronic circuits in the ProfiLux.