temp probe

[Rick Mayfield (rcmayfld)]

I'm looking to purchase a temp probe to hook up to the arduino.
I'd like a metal fixture, like a candy or meat thermometer.
My target temp is 350 degrees.
any suggestions?
thanx
rick

[claudio donndelinger]

Most foodservice temp probes are a type-K thermocouple, you should be able to pick one up locally and mod it however you need. They come with long or short leads...

CD

[Ben Eishen]

PT100 would work, but might require some opamps. Would the sensor be submerged? And would the cable be exposed to the heat? You could also use a thermocouple, but it would require additional hardware to work.
--
Ben S. Eishen
773.234.7436 | b...@eishen.com
9160 Hwy. 64, Suite 12-302, Lakeland, TN 38002

[Sonny Mounicou]

Rick,

You have two options.  A thermistor or a thermocouple.  The thermistor is very cheap, and doesn't require special circuitry to read.  I'm sure I can find a spare and if I can't, they are less than $5. 

The other option is a thermocouple.  The easiest way to hook it up is to use a breakout board like this one from adafruit https://www.adafruit.com/products/269 .  You can get the thermocouple itself from sears or online.  The price will vary accordingly.  You probably want a metal encased one like the ones fluke uses if you are going to use it for candy.  This will be a more expensive option at $30-$35 when all is said and done.

--Sonny

[Rick Mayfield (rcmayfld)]

Thanx for all the input.

I realized that I may own a couple of thermistors.

I had in my mind a long tube like device like my analog indicators.

I need to check my "junk box"

Again,  thanx

Rick

[Keith]

The National Semiconductor LM335 is good from -55 to 150C (around 300F) and is very easy to use.

I have several in my "junk box" if you want to try them out.

 

Keith

The LM135 series are precision, easily-calibrated, integrated circuit temperature sensors. Operating as a 2-terminal zener, the LM135 has a breakdown voltage directly proportional to absolute temperature at +10 mV/°K. With less than 1Ω dynamic impedance the device operates over a current range of 400 μA to 5 mA with virtually no change in performance. When calibrated at 25°C the LM135 has typically less than 1°C error over a 100°C temperature range. Unlike other sensors the LM135 has a linear output.

Applications for the LM135 include almost any type of temperature sensing over a −55°C to 150°C temperature range. The low impedance and linear output make interfacing to readout or control circuitry especially easy.

The LM135 operates over a −55°C to 150°C temperature range while the LM235 operates over a −40°C to 125°C temperature range. The LM335 operates from −40°C to 100°C. The LM135/LM235/LM335 are available packaged in hermetic TO-46 transistor packages while the LM335 is also available in plastic TO-92 packages.

[Keith]

Retraction: the LM335 operates from −40°C to 100°C.

I don't have any of the LM135s.

 

Sorry,

 

Keith