neilh20

Hi Eric. this is a voltage sensor, so it fits a pretty basic type of sensor, measure the voltage and then translate it to depth.

For a sensor, layers of calibration give value. Calibration of the sensor to defined units (V to mm), and calibration of the water height to the measured height in the flume.

The accuracy sounds pretty reasonable, for…[Read more]

Good to hear. and definitely very interested in use with a flume.  What range of water depth measurement are you looking for and depth accuracy of measurement.

Typically, because  ADCs are got good around 0.0V and rail – the Sensor range from 0.0 to full range, the Voltage range is from 10%Rail to 90%Rail (eg 0.3V to 3.0V for 3.3VDC rail) and t…[Read more]

Hi Eric – I’ve purchased and looked at using the eTape.

I was just wondering what made you think they are “calibrated” – that is the “0.0” markings relates to a defined voltage.  Usually this is shown for a calibrated sensor.  Similarly for a Full Scale relates to a known Voltage.?

looking at the graphs,  they describe “0-5VDC Linear Re…[Read more]

Hello Elliot, gosh too bad for the experience. Its a core issue of how to ensure there is enough power, and then also recover from low power events.  However to be able to get some help its best to post the details of the two systems.  Need to phrase the problem with enough detail that some one else might be able to comment.  Battery size and so…[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]

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]

@d_manning just wondering if you have had any insights 🙂

I did some blog posts in 2016 with a number of depth sensors that quoted an error for a very wide temperature compensation. They where the Insitu LT500 (best), Keller Nanolevel, Keller Acculevel, Keller Level gage (worst).

I setup a situation with the depth sensors in a jar of water (low depth)  with a good solar aspect to test how well they met…[Read more]

As you say from 2nd sept – something changed, after that it looks to me like its is triggered by the temperature changes. Its just a visual analysis, but also using the conductivity. With a rain event the conductivity also typically changes, and of course temperature can change.

For daily diurnal cycle after sept 2 the temperature starts varying…[Read more]

Just wondering if you could post a link to where the data is being collected, and look at it as a system.

Oh interesting, Thanks for sharing,   Sounds like it connected some of the time, showing that it was possible to connect.  I’ve found there are four source of failure – setup to cell tower,  TCP/IP setup, POST ack,   MMW timeout,

I found this  hardware data sheet – but it turns out there is a GM1 and GM2 – GM1 is the low power. I wonder which o…[Read more]

@tumayflybearriver – thanks for brining it up.  Its nuts, but  looks to me like the signature of  “thrown away data” by  ModularSensors software that runs on the Mayfly, and the ODM2  software on monitormywatershed.

I’ve raised the issue of reliable delivery in 2018, and implemented it on my systems and offered it to the mainline Modu…[Read more]

Hey thanks for the reference. I’ve also been monitoring blynk .

Do you offload the data regularly? – that seems to be the big gotcha is figuring out how often to download data.

Hi @braedon-dority, my take is that the first step is to have personal documentation to be able to repeat your work, and that you can read it. Just to be basic, part of the learning is how to do documentation that you can then read your self.

Personally I find I come back to a working sensor some years later – and then want a traceable reference…[Read more]