RTDs generally have inferior spatial resolution as compared to thermocouples. Re

Question

RTDs generally have inferior spatial resolution as compared to thermocouples. Resistance of the thermistor we used in our lab decrease with increasing temperature. As for the strain gage, the lead wire resistance of the RTD does not affect the voltage output. RTDs are generally more accurate than thermocouples end thermistors. The static pressure is the largest pressure in the flow held. The average velocity in the circular tunnel is the arithmetic mean of the velocities we measured across the transverse of tunnel. The OP-AMP circuit we built in the frequency lab is an inverting OP-AMP. The amplifier gain, g, is generally Vie same as G, the gain of the amplifier circuit using the OP-AMP as a component. The time constant for decay of the vibrating beam was equal to the inverse of the product of the damping ratio and the natural frequency. A ballast circuit was built for the thermistor to amplify the output signal.

Explanation / Answer

1).

The RTD element is constructed from a pure material.The material has a predictable change in resistance as the temperature varies , it is this change that is used to determine temperature. RTD has excellent accuracy as compare to the thermocouple.

2). Thermistors are a type of resistor with an electrical resistance that possesses either a negative or positive temperature coefficient of resistivity. Thermistors are composed of solid semiconducting materials with a resistance that decreases 4% per °C. They are constructed in a variety of sizes and may be obtained with thermal time constants of a millisecond or less. Thermistors produce a non-linear voltage and because of this are limited to a useful temperature span of only about 100°C.

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