I've been looking at this type of thermocouple. and I think it would have the same type of problem with a thermocouple type k. when in contact with the flame that can degrade. and if not degraded, I guess the temperature to be recorded will be the flame, as the capsule that houses the resistance is in contact with the flame. we want to measure the temperature of the wall of the cone From: vicente_alvero_14@xxxxxxxxxxx To: sugarshot@xxxxxxxxxxxxx Subject: [SS2S-Main] Re: Tempilstick Date: Tue, 25 Nov 2014 20:17:57 +0100 Can you show some kind of this resistance? Date: Tue, 25 Nov 2014 11:09:59 -0800 From: grants2@xxxxxxxxxxx To: sugarshot@xxxxxxxxxxxxx Subject: [SS2S-Main] Re: Tempilstick True, about melting thermocouples, but if that happens and it was a K thermocouple was mounted between the liner and motor case, the game was over long ago! Then use Pt resistance "thermocouples" if more than 1350 C is needed. btw multiple thermocouples don't need to be insulated from each other or the case at the junction. Strange but true. I brazed, TIG welded, and clamped three K thermouples on a sheet of steel, put it in the oven and the temperatures tracked appropriately. That makes it easier to measure a liner at different places. Grant On 11/25/2014 9:32 AM, Hans Olaf Toft wrote: Thermocouples are cheap and work well, but if they are embedded in a sample that gets torched, they will at best record the surface temperature of the sample at the brief moment they are at the surface. It may work - and even provide usefull data - but an IR thermometer will read the surface temperature continuously. Hans On 11/25/2014 05:34 PM, Brian Su (Redacted sender cycloniterulez@xxxxxxxxx for DMARC) wrote: This one sure looks much better. Kind Regards, Brian Su. Sent from my iPhone. On 25 Nov 2014, at 16:27, Grant Saviers <grants2@xxxxxxxxxxx> wrote: Here is another ebay seller with all thermocouple options, packaging variations, temperature compensated junctions, and EMI filtering, etc. Looks to be professional grade engineering: http://www.ebay.com/itm/Quad-Channel-K-Type-Thermocouple-Amplifier-Conditioner-Analog-Output-AD8495-/331032888967?pt=LH_DefaultDomain_0&hash=item4d13190687 On 11/25/2014 8:10 AM, Grant Saviers wrote: A type K thermocouple is good to 1250 C. It will need a simple instrumentation amplifier to get the signal voltage to a range compatible with the Arduino A/D converter. For about $10 in parts you can build your own IN-AMP. There are several choices for single chip IN-AMPs that will do the job and here is a board from China for $10, and the chip output is 10mv/deg C. http://www.ebay.com/itm/AD597-Ultimaker-Temperature-Control-Board-K-Thermocouple-Signal-Amplifier-/321597894984?pt=LH_DefaultDomain_0&hash=item4ae0ba7148 Grant On 11/25/2014 1:12 AM, flint hapirat (Redacted sender flinthapirat@xxxxxxxxx for DMARC) wrote: One comment - The tempilstick temperature pens are rated between 38c-1093c... Hope this is still helpful. From: Vicente Alvero Zambrano <vicente_alvero_14@xxxxxxxxxxx> To: "sugarshot@xxxxxxxxxxxxx" <sugarshot@xxxxxxxxxxxxx> Sent: Sunday, November 16, 2014 9:10 PM Subject: [SS2S-Main] Re: volunteering Thanks for your reply Markus, It is a good idea. The main problem I see is that we need to measure high temperatures. I do not know exactly how much, but around 1200ºC. And this only measures halfway. Do you know if there is a sensor for arduino with this possibility? From: m.bindhammer@xxxxxxxxxxx To: sugarshot@xxxxxxxxxxxxx Subject: [SS2S-Main] Re: volunteering Date: Sun, 16 Nov 2014 23:21:22 +0800 Hi Vicente, It is quite easy to build a data logger with an Arduino based micro controller, SD card, SD card socket, HEF 4050 voltage level shifter, DS1307 RTC and one (or more) MLX90614 IR thermometer(s) which communicate(s) over the I2C bus as well. I am just doing this for a medical project. Markus From: vicente_alvero_14@xxxxxxxxxxx To: sugarshot@xxxxxxxxxxxxx Subject: [SS2S-Main] volunteering Date: Sat, 15 Nov 2014 19:21:26 +0100 Hi all again, Although a long time do not talk about it, yet we continue the investigation of ablative materials. For the study of the material that will coat the nosecone of our rocket; Richard, Mattias and I already started last summer to work on it. Throughout this week, I've been talking to Hans, and he thought the possibility to also measure the temperature on the side of the wall that is in contact with the flame. Would be measured by an infrared thermometer. I am contacting you to see if anyone is interested, or know how, to attach an infrared thermometer with data logger that Liam is manufacturing for thermocouples. By this, we can obtain pairs of temperatures at the same point. Both outside and inside of the wall, in order to obtain among other data, values of thermal conductivity and heat capacity of each material. Thanks in advance for your cooperation and interest.