Max32865 for PT1000 - Ref Resistor

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Uncle_Shorty
 
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Max32865 for PT1000 - Ref Resistor

Post by Uncle_Shorty »

I recently ordered and received a Max31865 from your company. The breakout board is packaged as Adafruit PT 1000 Temp Sensor max31865 which matches the unit I ordered.

However, the reference resistor provided with the unit I received is 432 ohms. Previous Max 31865s for a PT1000 have a 4300 ohm resistor.

Please confirm the unit I received with work, without physical modification, with a PT1000 RTD.

The reference resistors for my PT100 breakout boards have 430 ohm resistors. Why does the unit in question differ from my existing PT1000 units?

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adafruit_support_carter
 
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Re: Max32865 for PT1000 - Ref Resistor

Post by adafruit_support_carter »

Are you sure about the value? Check here for how to determine:
https://learn.adafruit.com/adafruit-max ... fier/f-a-q

If the resistor has "432" on it, then it is a 4.3kohm resistor for use with 1kohm RTDs (PT1000).

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Uncle_Shorty
 
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Re: Max32865 for PT1000 - Ref Resistor

Post by Uncle_Shorty »

I understand now. Pt1000 = 432 & PT100 = 431 on Adafruit boards. Thank you.

I think the two units I have that are marked 4300 are not authentic adafruit boards. I will go back into my records to see where they came from.

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