New Book - RTD Temperature vs Resistance Tables

RTD Temperature vs Resistance Tables

Those who know me know that I'm an instrumentation professional and I've been in the profession since 1985. One of the instruments that I've handled many times are RTDs, or Resistance Temperature Detectors. These are temperature measuring devices and are very popular in industries due to their accuracy, temperature range, and low drift. Handled and installed properly, they will last almost indefinitely.

RTDs operate on the principle that metals change their electrical resistance in response to temperature. This means that you can determine the temperature of the RTD by mea-suring its resistance.

Unfortunately, there many types of RTDs and each type has a different resistance at any given temperature. This is usually not a problem because instruments that use RTDs as a temperature measuring sensor perform the conversion of resistance to temperature internally.

However, if the instrumentation technician or engineer doesn't have such an instrument, and all he has is a digital multimeter or a resistance meter (devices that can measure resistance) or a resistance decade box (devices that can simulate resistance), he needs to know what resistance corresponds to what temperature. This book gives that information in the form of tables.

You can get these tables on the internet, yes, but you'll likely get only one table for one type of RTD. To get tables for other types, you'll need to perform several searches. Also, the smallest temperature interval you can get is 1°C. If you need to know the resistance of a fraction of a degree (e.g. 43.6°C), you'll need to perform a small calculation and you'll probably need a calculator.

This book gives the resistance values at temperatures ranging from -200 to 650 or 850°C for Pt100(385), Pt100(3916), Pt100(3926), Pt200(385), Pt500(385), and Pt1000(385), the most commonly used RTD types in use today. Furthermore, the book lists the resistances for temperatures at 0.1°C intervals. You're getting a very comprehensive source of information for temperature-to-resistance tables.


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