**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 » | over 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 » | almost 9 years ago | |||
| tonyc | " hasn't lost a drop! " | Read more » | almost 9 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 » | almost 9 years ago | |||
| mathew | "These 18650 keychain battery holders just arrived. They're great: " | Read more » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 years ago | |||
| liz | "That's how i keep score too @cfastie ! " | Read more » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 years ago | |||
| liz | "Presta valve on a soda bottle - yes! " | Read more » | almost 9 years ago |