[How to calibrate the temp sensor]

6 hours ago, Adamw said:

Near enough.  A couple of examples, the 3523ohm @ 20deg Vs 3511omh in the link cal would result in about a 0.1°C difference.  The 667ohm @60° Vs 660 would result in about 0.2°C difference.  For a sensor with a tolerance of +/-1.5 it is close enough.  

That makes sense. Thanks again for the quick reply/help, really appreciated!

[How to calibrate the temp sensor]

23 hours ago, Adamw said:

Yes the values in that table are in ohms.  These sensors use the common GM/Delphi/Delco calibration, pretty sure if you hit "load" in the ADL calibration window you will find a delco or delphi temp sensor calibration in there (air or fluid temp use same cal). 

 

The manufacturer doesnt quote any specifics for this.  But all we have tested have been close batch to batch and match the quoted curve well.  Since the manufacturing methods for the NTC ceramics is pretty much the same for everyone, NTC's in general arent great, but from my experience I would say they fit within a similar accuracy and tolerance to the bosch specs which is +/-1.5°C at 25°C and +/-3.5°C @ 100°C.  Below zero they are much more variable.  

   

Figured I'd follow-up on this, checked the included calibrations and there was indeed one for Delco. It's similar, but doesn't match 100%, not really sure where the difference is coming from, theoretically given the same pullup resistor value is used the values should be the same. Might be the tolerances that you mentioned I guess?

[How to calibrate the temp sensor]

24 minutes ago, Adamw said:

Yes the values in that table are in ohms.  These sensors use the common GM/Delphi/Delco calibration, pretty sure if you hit "load" in the ADL calibration window you will find a delco or delphi temp sensor calibration in there (air or fluid temp use same cal). 

 

The manufacturer doesnt quote any specifics for this.  But all we have tested have been close batch to batch and match the quoted curve well.  Since the manufacturing methods for the NTC ceramics is pretty much the same for everyone, NTC's in general arent great, but from my experience I would say they fit within a similar accuracy and tolerance to the bosch specs which is +/-1.5°C at 25°C and +/-3.5°C @ 100°C.  Below zero they are much more variable.  

   

Perfect, all clear now.
Thanks for the clarifications, very helpful!

[How to calibrate the temp sensor]

On 5/27/2021 at 12:20 AM, Adamw said:

Use 1Kohm pull up and Cal table 1, 2 or 3 set up like below.

Hi @Adamw Just wanted to check, these values are in Ohms, right? I've bought a NTC1-8 because it was the only option I could find with a DTM connector on it and need to fill in the calibration table in my datalogger (MoTeC ADL3) so I just wanted to check to make sure I fill in the correct values. The logger also has a 1KOhm pullup on its temp inputs, so I expect it should work the same/require the same calibration values.

And these sensors are all calibrated out of the factory? What is their expected accuracy/deviation?