Turbo IAT sensor to handle high IAT temps?(GM sensor melted)

[forcefed86]

Looking for a nice MS3 compatible IAT sensor. Most likely some sort of K-type thermocouple? Need it to read reliably above 250* and not melt like the typical GM thermister sensor. This is a non intercooled alcohol fueled engine.

Was thinking a sensor like this. Was hoping I could get away without the module and use a similar sensor read by the MS3?

Claims it reads up to 631*.

http://www.plxdevices.com/Air-Intake-Te ... 002214.htm

[dontz125]

You could build something like this circuit in the proto area. Change the +12v feed to 5v, delete 10k and 15k resistors (connect pins 8 & 9 to the top of the 1nF cap), and you get a 5v signal at 500C. The output from the circuit could go to any ADC; if routed to one of the MS3X ADCs, delete the filter circuit.

Edit - And yes, that means if using an MS3X card, all you need between the TC wires and the ADC is the AD595.

[forcefed86]

Would something like this work then for those of us that are less tech savvy and didnt' want to build the circuit?

http://www.sunrom.com/p/analog-output-k ... -amplifier

Or this...

https://www.tindie.com/products/reinnov ... amplifier/



Thanks!

[billr]

Yes, either would work, they are very similar in design. However, I can't tell which AD (Analog Devices) chip the first one uses, and the second one looks like it uses the AD8495. That device is optimized for accuracy in the 0-50C range, I would prefer the AD8497 that is optimized for 0-100C. Either can be used to much higher temperatures, as indicated, but accuracy won't be as good. By the way, I just bought some AD8497 chips for $4.81 + shipping (in small quantities), so the price of either of those boards seems quite reasonable!