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RTD and SPRTs Quiz

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Questions and Answers

What is the relationship between the measured voltage and RTD resistance in a two-wire design?

Directly proportional

Non-linear (correct)

Exponential

Linear

What is a key characteristic of thermistors?

Linear resistance change

Resistance change with temperature (correct)

Low accuracy

High sensitivity

How are Positive Temperature Coefficient (PTC) thermistors different from Negative Temperature Coefficient (NTC) thermistors?

PTC made from oxides of metals, NTC made from semiconductors. (correct)

PTC resistance decreases with temperature, NTC resistance increases.

PTC used in high-accuracy measurements, NTC in low-accuracy measurements.

PTC forms a barrier to electricity flow, NTC becomes conductive.

What is the range of temperature that can be measured by a typical thermistor?

-40 to +150 °C Signup and view all the answers

What is the main reason for the use of four-wire designs in resistance measurements?

To minimize strain due to thermal expansion Signup and view all the answers

In which type of thermistor does the resistance increase with increasing temperature?

PTC thermistor Signup and view all the answers

What type of device is an RTD?

Positive temperature coefficient Signup and view all the answers

What is the accuracy level that can be achieved with industrial RTDs?

+0.1°C Signup and view all the answers

What distinguishes Standard Platinum Resistance Thermometers (SPRTs) from regular RTDs?

Ultra-high accuracy Signup and view all the answers

Why have Platinum Wire RTDs (PRTs) established themselves as the industry standard for temperature measurement?

They are suitable for use as a secondary standard Signup and view all the answers

What is the temperature range for Platinum Wire RTDs (PRTs)?

-200 to 800 °C Signup and view all the answers

Why is Thin-Film RTD design gaining favor?

Lower cost Signup and view all the answers