http://www.seeedstudio.com/depot/temperature-sensor-with-steel-head-p-78.html?cPath=144_147
I bought this sensor because it looks like the head can be submerged in water and get a reading. The big question I have is that it only has 2 leads…so I’m guessing one for PWR and one for GND. The only temperature sensors I’ve seen had 3 pins…like the LM35.
I’m confused as to how I can read temperature with this thing…any ideas?
I think it's a variable resistor, like a light sensor, which also has two wires. Here's a light sensor tutorial: http://www.ladyada.net/learn/sensors/cds.html with a wiring schematic halfway down under "analog voltage reading method"
According to the datasheet you linked, it's a resistor that varies it's resistance according to the temperature.
At -25 degrees C it has 133K ohms.
At 125 degrees C it has .3K ohms.
So, you hook it up voltage divider style to an analog input.
http://www.arduino.cc/playground/ComponentLib/Thermistor is a general hookup diagram, but this part has a 133K top resistance, and I can't figure out what the max current for it is.