Quiz idk temperature

Question 1

Advantages of platinum RTD

Answer 1

• Good accuracy
• Repeatable/reproduce easily
• very linear in typical process range
• Fast reacting

Question 2

Disadvantages of platinum RTD

Answer 2

• relatively expensive (compared to thermistor) however cheaper than thermocouple
• unsuitable for extreme temperatures

Question 3

Advantages of thermistor

Answer 3

• small size
• inexpensive
• non-linear but still accurate and repeatable

Question 4

Disadvantages of thermistor

Answer 4

• highly non-linear
• narrow measurement range

Question 5

What is an RTD

Answer 5

RTD’s (Resistance temperature detector) are made by wrapping a length of fine metal wore around a supporting ceramic or glass core. This structure may then be enclosed in a stainless steel sheath to protect the RTD from physical damage and hostile environments.

They work by measuring the resistance from the metal due to an increase or decrease in temperature

Question 6

What is a thermistor

Answer 6

A thermistor is a semiconductor device made from metal oxides. They usually exhibit a negative resistance - temperature coefficient (NTC). As temp. increases, resistance decreases. However, positive temperature coefficient thermistors (PTC) are also available

Question 7

What is a thermocouple

Answer 7

A thermocouple is formed by joining two dissimilar homogeneous metals. They work by producing an emf or voltage when there is a temperature difference between the hot and cold junctions