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All content on EnviroDIY is licensed as Creative Commons Attribution-ShareAlike 4.0. Hardware designs on EnviroDIY are released under the CERN Open Hardware License 1.2. Alternative licenses are available. Learn more
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kakashinichi became a registered member 2 years ago
kakashinichi
@kakashinichi
dan@wachusett replied to the topic Hydros 21 CTD sensor calibration question in the forum Environmental Sensors 2 years ago
<div class=”bbp-reply-author”>@rogers1313</div>
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<div>I have used the Hydros-21 for several years now and can add a bit to what Neil has mentioned. I also asked the engineers at Meter Group about temperature compensation and found their response unhelpful. My Hydros21 sensors output water depth that is highly affected by temperature (I…[Read more]
fisherba started the topic N2O sensor recommendations? in the forum Environmental Sensors 2 years ago
Hi all,
I’m looking for recommendations for N2O sensors. We are looking for 0-100 ppm range and curious if others have any that they recommend. Hoping for sensor cost under $2000 and shipped from the US so we don’t have to navigate duty and institutional rules for international purchases. I will be using it in a soil gas application, but the…[Read more]
XIngong Li became a registered member 2 years ago
XIngong Li
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Fernando Rojano became a registered member 2 years ago
Fernando Rojano
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neilh20 replied to the topic Hydros 21 CTD sensor calibration question in the forum Environmental Sensors 2 years ago
@rogers1313 – its a good “engineering question”. speaking as an electrical engineer and some one that has blogged on understanding traceability, measurement range, measurement resolution. measurement accuracy and total error band of measurement being different aspects of the measurement.
In short the Hydro 21 has calibrated measurements th…[Read more]
RogerS started the topic Hydros 21 CTD sensor calibration question in the forum Environmental Sensors 2 years ago
Please help to clear up my thinking about these sensors.
This has probably been asked before, but after searching thru the forum I am not finding answers to this question. We have the Hydros 21 CTD sensor. It looks like this sensor is calibrated at the factory and the sensor reports engineering values to the Mayfly datalogger.
Is this ass…[Read more]
Curtis DeGasperi became a registered member 2 years ago
Curtis DeGasperi
@curtisld
John replied to the topic Problems with a combined MH21 Gen1 and Gen2 station in the forum Mayfly Data Logger 2 years ago
Ah! Some pieces are coming into clearer focus.
Thanks!
Shannon Hicks replied to the topic Problems with a combined MH21 Gen1 and Gen2 station in the forum Mayfly Data Logger 2 years ago
The only difference between the Gen 1 and 2 Hydros21 sensors is that the Gen 2 sensors need a little more time to respond to the SDI12 measurement command, which is hardcoded into one line in the MeterHydros21.h file within the ModularSensors library. If you’re using the most recent version of ModularSensors, then your code will support both…[Read more]