Question

No other thermometers is as suitable as platinum resistance thermometer to measure temperature in the entire range of :

• A. $0^{0}C$ to ${100}^{0}C$
• B. ${100}^{0}C$ to ${1500}^{0}C$
• C. $-{50}^{0}C$ to ${350}^{0}C$
• D. $-{200}^{0}C$ to ${600}^{0}C$

Answer 1

Answer: (D)

$-{200}^{0}C$ to ${600}^{0}C$

A platinum resistance thermometer also called PRT determines the temperature by measuring the electrical resistance of a pure platinum wire. This platinum wire acts as a temperature sensor and is very sensitive within the given range and has good reproducibility. With careful consideration, a wire of suitable length and diameter can be chosen so that the resistance of the device at $0^{o}C$ is $100\Omega$ and such that the temperatures between ranges of $-{200}^o$C to ${600}^o$C can be detected.