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<p style=”text-align: left;”>I’m just connecting one Turner phyco c-flour sensor.</p>
I assume these resistor pairs are independent and shouldn’t affect how a single sensor reports.
<p style=”text-align: left;”>Thank you for the previous response regarding the cable glands.</p>

Are you trying to measure 2 analog signals from 2 separate sensors with just one 6-pin screw terminal board?

Shannon, I went ahead and soldered four 10k resistors instead of the two I originally said, similar to what you did here:

Does that still work for my purposes or does it change things?

Thank you.

That happens occasionally when the connection between the Mayfly and the online time server gets terminated before the entire timestamp gets transmitted, resulting in an incomplete timestamp, and the Mayfly code has some smarts to check whether the timestamp it received is a valid, reasonable date.  If you ever get this error, you can just…[Read more]

Hi Jake, no “pressure sensor” is going to be able to be linear/accurate if ice is forming and expanding in the protective enclosure round the pressure sensor. My guess is  the whole sensor would have to be specially designed to allow for the ice expansion to even survive a freezing event.

My hypothesis (guess) would be that its the nearly…[Read more]

Thanks for your thoughts Neil.

These blips are occurring over the course of hours (roughly 4-6 hours from when depth starts dropping until it reaches it’s lowest point) though the time varies by occurrence.

They seem to be happening as temperature approaches the freezing point. I’ve attached a graph with temp for reference.

I wonder what the water temperature is, or if there are water temperature changes, when this is happening.

From the graph it reads the water level is at 20″ depth then on the 10th Feb it drops by up to 5″ for some  time (hours?) before recovering, with 3 other similar but not us pronounced events

IF any for of ice could build up in a pressure…[Read more]

The cathode is exposed. I did rinse the cathode when I cleaned everything and there was nothing obviously fouling it. The probe tip being under the membrane cap I considered pretty well protected. After examining my data and pictures of the probe tip, Atlas Scientific had no explanation other than saying maybe there was an unknown material…[Read more]

Hi Kurt,

In regard to downward trending DO readings, contamination, membrane damage, and electrolyte, is there an anode and cathode on your probe that you can clean? I used to use a YSI galvanic DO meter that would accumulate tarnish, which I would occasionally sand off to improve the responsiveness of the readings.

Neil, there is a faster and more flexible way to extract data from Monitor My Watershed. Instead of using the CSV download button, try using either python or R to extract specific time periods of data for specific sensors and stations. Sara has documented these methods here:  python version and R version.

I got it to work.
I edited the libraries and logging program to use the new sensor. https://github.com/brianjastram/GHWX/tree/main/GHWX4

Wow!  Thank you again.

I am so impressed by your detailed, expert, and helpful response.