Adding Expansion HUb and Salinity Expansion

[rimai]

Same USB cable. No need for power on the hub

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[Sacohen]

The expansion hub does not need a power supply, mine does not have one.
Also it can use a similar USB cable.

I needed a longer one today for something I was testing and used one from a USB drive I had and it worked.

[ganjero]

Swapped some cables with some from my other equipment and it seems to be working now.

Now Im having issues calibrating the probe. Do I need to rinse it and let it dry before calibration? I put it in a cup with water at 35ppm, calibrated it but it shows my tank at 44 when my tank is actually 32. Does water temp matter?

Thanks

[Sacohen]

Looks like you have a bad cable. Glad it was resolved.

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[ganjero]

Well now that the probe seems to be not working correctly.

Looking at the salinity chart this morning it shows the salinity at ~44 it goes down to ~22 and jumps back up to 44.

There a not bubbles in the area, the temp is steady...not sure how correct this.

[rimai]

Shake the probe to make sure there is no bubble trapped in the tip.
What happens if you place the probe in a cup with tank water?

[Sacohen]

Ouch. I hate when a bubble get trapped on the tip.

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[ganjero]

Roberto,

I shook it but I don't think it was air trapped as it kept going up and down. Around 8pm last night I put it in a cup of saltwater and it has been showing stable salinity. See the chart below.

Do you know what could be the issue when I sue it in my sump?


Thanks

[rimai]

Something else that is connected to your setup is doing that.

[Sacohen]

I've been watching this for a bit and just want to though in my 2¢.

Do you have an ATO that is feeding fresh water into the sump, possibly close to the Salinity Probe?

[ganjero]

Something else that is connected to your setup is doing that.

Roberto,

When you say setup, do you mean the reefangel controller? or my entire reef system?

I've been watching this for a bit and just want to though in my 2¢.

Do you have an ATO that is feeding fresh water into the sump, possibly close to the Salinity Probe?

Good point, and believe it was somehow close. I will try setting them on opposite sides and see how that works, but if that is the case shouldn't it just go down and then back to 32-34 instead of 44?


Thanks

[Sacohen]

I've been watching this for a bit and just want to though in my 2¢.

Do you have an ATO that is feeding fresh water into the sump, possibly close to the Salinity Probe?

Good point, and believe it was somehow close. I will try setting them on opposite sides and see how that works, but if that is the case shouldn't it just go down and then back to 32-34 instead of 44?


Thanks[/quote]

That is true it should go back to normal and not 44ppt.
Is your ATO dosing Kalkwasser too?
I had my Salinity probe get covered with calcium deposits and it gave me crazy reading.

[ganjero]

Placed in a different area in the sump and still have the same issues.

Does anyone know what equipment commonly cause issues with this probe?

[Albe]

Have you checked for stray voltage?

[ganjero]

Measured for Stray voltage. I have a ground probe installed so I removed it, my multimeter shows a reading of 14. I turned everything off and almost every piece of equipment added a point.

When I put the ground probe back in the reading goes back to zero, but I found that if I leave it out the salinity reading stays constant, 5 points off but constant.

Any thoughts?

[rimai]

Do you have another 12VDC power supply to try connecting to the salinity module?

[heatdissipation]

Is this the same salinity expansion I bought off of you today?