Will the LM35 go up to 200 deg C?


This sensor seems popular with the arduino crowd, however I see that it is only rated to 155 deg C. I need a sensor capable of reading around the range of 200 deg C with the reliability of +- a few degrees. Do you think I can push the LM35 this high or it won't work? Any suggestions on other sensors?

Thanks, Ownage

I don't think you can/should push it.

At higher temperatures an RTD is often used. Omega claims their RTD's are accurate to within ~2C at 200C:


-- The Ruggeduino: compatible with Arduino UNO, 24V operation, all I/O's fused and protected

Thanks. They make you buy in packs of 100 though :(. I didn't see any other cost effective RTDs. Is there a cheaper way I can read this temp?

Possibly automotive coolant temp sensors? I live by a junkyard.

How about one of these?


-- The Rugged Motor Driver: two H-bridges, more power than an L298, fully protected

A K or J type thermocouple will read these temperatures. To interface these you will need a thermocouple interface IC which is typically an SMD part.

I am working with the MAX31855 and K-type thermocouples. I should have a sketch and schematic later this week. I am using my PICOBEE board http://wiblocks.luciani.org/PICO/PICOBEE-index.html to periodically measure temperature and transmit the timestamped data to a PC. The MAX31855 has a 14bit ADC and has a resolution of 0.25degC. Not sure of the accuracy yet.

(* jcl *)

Thermistors won't last 200 DegC and their housings aren't rated for that temperature. I would use thermocouple too. If you don't need sub DegC accuracy, you can find cheaper infrared remote temperature sensors too.

I just added a thermocouple + XBee application hint to my site -- http://wiblocks.luciani.org/docs/app-notes/picobee-tc.html.

I interface a K-type thermocouple using the MAX31885KASA. I use the RTC on the PICOBEE to periodically interrupt the uC. After an interrupt the temperature is read. The timestamped data is transmitted using the XBEE.

(* jcl *)