Water conductivity monitoring
activity:conductivity

**Conductivity** is a measure of a solution's ability to conduct electricity, as measured in Siemens per meter (S/m). (lead image by @ddileona) This page is under development, please add background info: * Info about regulations * Info about ecological or human health impacts * Advocacy leverage points * Constraints we're working within: cost, complexity, sensitivity, time Also see resources on this page: https://publiclab.org/wiki/conductivity_sensing ## Questions [questions:conductivity] **** ## Sensors Here's a list of different conductivity sensors and measurement systems. Also see below for some Do-It-Yourself approaches to measuring conductivity, and [this page](https://publiclab.org/wiki/conductivity_sensing) for more information. * [the Coqui](/wiki/coqui) **** ## Activities Activities for people to test methods (these develop over time) [activities:conductivity] **** ## Existing work [notes:conductivity] ...


Author Comment Last activity Moderation
donblair "Ben, Fantastic job on this! Excellent descriptions of the entire system -- the electronics, the probe design, and the calibration procedure. Ver..." | Read more » about 8 years ago
mathew "for completeness' sake: Check out @edwardmallon's note: https://publiclab.org/notes/donblair/09-08-2015/rubba-stoppaz#c13904 Chris fastie's Nalgen..." | Read more » about 8 years ago
tonyc " hasn't lost a drop! " | Read more » over 8 years ago
tonyc " Tried drilling through bottle cap, then making the hole really jagged using an awl. Then a pen tube through a rubber stopper, thick layer of sili..." | Read more » over 8 years ago
mathew "These 18650 keychain battery holders just arrived. They're great: " | Read more » over 8 years ago
cfastie "Threaded lamp pipe comes in zinc plated steel, but I don't think we will find stainless. Here are two bulk suppliers of nipples: http://www.antique..." | Read more » over 8 years ago
mathew "The lamp pipe looks very close to an ideal solution, but... lead is added to brass to make it more machinable. If the brass isn't certified for us..." | Read more » over 8 years ago
mathew "I'm excited about lamp rods. sorry, I was confusing the 'lamp nipples' with air hose nipples and the like: My one concern is that brass parts wi..." | Read more » over 8 years ago
tonyc "I don't follow. Are you saying they will work, and drop the mic in a "hellz-yeah" way? or are you saying they won't work and drop the mic like a Ni..." | Read more » over 8 years ago
mathew "those lamp rods! mic drop I've toyed with brass nipples, but most valves expect to be screwed into a thicker material and have tapered threads (la..." | Read more » over 8 years ago
tonyc "I ordered these lamp rods, some of the threaded cable penetrators, and some silicone tubes to the pdx office. The blue robotics folks say steep bul..." | Read more » over 8 years ago
cfastie "Threaded lamp pipe. 3/8" OD. $3.27 for 8 pieces http://www.homedepot.com/p/Westinghouse-8-Assorted-Nipples-7015000/204836020?MERCH=REC-_-PIPHoriz..." | Read more » over 8 years ago
mathew "These M12 vented screws give another .2mm of space for wires (2.5mm) and a knurled end for better purchase when turning. I'd feel comfortable comp..." | Read more » over 8 years ago
mathew "I've looked at those vented set screws-- their vent holes are tiny but they might work. I'd like to try sealing one with glue. My suspicion is th..." | Read more » over 8 years ago
cfastie "Any hollow bolt can be a cable penetrator. These cost $1.20 apiece, but you also need two nuts and rubber washers. The hole is only 2.3 mm in diame..." | Read more » over 8 years ago
mathew "@pdhixenbaugh, we have experimented with putting cables straight through the cap, and it hasn't been successful. the plastic (HDPE) of caps is ver..." | Read more » over 8 years ago
pdhixenbaugh "Some ideas: I love the presta valve idea (I used to work in a bike shop, and we threw many of these away each day from flats). I wonder if having ..." | Read more » over 8 years ago
liz "That's how i keep score too @cfastie ! " | Read more » over 8 years ago
cfastie "Yes Nalgene. Remember when BPA drove all responsible mothers and other tree huggers to abandon Nalgene water bottles? I have a box in the shed ful..." | Read more » over 8 years ago
mathew "To sum: @cfastie will be using a Nalgene bottle, @mathew will be using stoppers and pop bottles, and @donblair will be using screws and water bottl..." | Read more » over 8 years ago
cfastie "How many sensors can a Riffle monitor gracefully? Considering that the typical sensors that might be used are cheap and maybe unreliable, does it ..." | Read more » over 8 years ago
mathew "Thanks! I bet the thermal coupling with a temperature probe could be easily accomplished with some heatsink thermal paste connecting the temperatu..." | Read more » over 8 years ago
donblair "Wow, amazing note. Thanks so much for putting all this so nicely together, @mathew!!! Still digging in, but quick thoughts: The 6-32 screws wit..." | Read more » over 8 years ago
liz "Presta valve on a soda bottle - yes! " | Read more » over 8 years ago