stardustsailor
Well-Known Member
I go with louder than normal fans because I listen to music throughout the house all day with surround in each room. I'll post my new design when it's done
lol
The temp resistor I had in mind was this
https://www.sparkfun.com/products/10988
It cost two dollars but I bet in bulk of 10 you could go to 1.50. I have personally held a flame on this until it hit 100*C without a problem. So place it touching the CXA on the outside through the hole you will probably drill for the CXA wires anyway. Easy. Cheap
Osram suggests K type thermocouples glued with thermal epoxy...(can't be soldered..Alloy won't allow.)
Cree suggests T type type soldered ...
TMP36 - Temperature Sensor
- 10 mV/°C scale factor
- ±2°C accuracy over temperature
- ±0.5°C linearity
- Operating Range: −40°C to +125°C
Type J
Type J (iron – constantan) has a more restricted range than type K (−40 °C to +750 °C), but higher sensitivity of about 50 µV/°C.[2] The Curie point of the iron (770 °C)[9] causes a smooth change in the characteristic, which determines the upper temperature limit.
Type K
Type K (chromel – alumel) is the most common general purpose thermocouple with a sensitivity of approximately 41 µV/°C (chromel positive relative to alumel when the junction temperature is higher than the reference temperature).[10] It is inexpensive, and a wide variety of probes are available in its −200 °C to +1350 °C / -330 °F to +2460 °F range. Type K was specified at a time when metallurgy was less advanced than it is today, and consequently characteristics may vary considerably between samples. One of the constituent metals, nickel, is magnetic; a characteristic of thermocouples made with magnetic material is that they undergo a deviation in output when the material reaches its Curie point; this occurs for type K thermocouples at around 350 °C.
Type K thermocouples may be used up to 1260 °C in oxidizing or inert atmospheres without rapid aging. In marginally oxidizing atmospheres (such as carbon dioxide) between 800 °C–1050 °C, the chromel wire rapidly corrodes and becomes magnetic in a phenomenon known as "green rot"; this induces a large and permanent degradation of the thermocouple, causing the thermocouple to read too low if the corroded area is exposed to thermal gradient.[11] Another source of drift in type K thermocouples is that near 400 °C, a slow reordering in the chromel wire occurs; this is reversible and leads to hysteresis between heating and cooling.
Type T
Type T (copper – constantan) thermocouples are suited for measurements in the −200 to 350 °C range. Often used as a differential measurement since only copper wire touches the probes. Since both conductors are non-magnetic, there is no Curie point and thus no abrupt change in characteristics. Type T thermocouples have a sensitivity of about 43 µV/°C. Note that copper has a much higher thermal conductivity than the alloys used in thermocouple constructions, and so it is necessary to exercise extra care with thermally anchoring type T thermocouples.
......
Slow,innacurate,not sensitive enough ....
Don't you think ...?
Leds need only thermocouples for accurate and fast Temp measures ...
(Almost x1000 times more sensitive than the TMP 36 )
Nothing else can beat'em ....
