resistance thermometer

A standard example of a measuring unit is a resistance thermometer.

In principle, several types of resistance thermometers can be used.

Resistance thermometers and thermistors are generally used in two ways.

Mechanical strain on the resistance thermometer can also cause inaccuracy.

That is, the heat generated by the resistance thermometers themselves heat the sample.

The transducers most widely used are resistance thermometers and thermocouples.

Thermistor beads are also often used as the sensitive elements of resistance thermometers.

Temperatures between the fixed points can be measured, using a platinum resistance thermometer (up to 660 C).

An arm carrying thin-film resistance thermometers and a velocity anemometer.

The simplest resistance thermometer configuration uses two wires.

A resistance thermometer often conveniently takes the form of a hot-wire anemometer probe with a very low current through it.

For example, in the case of a platinum resistance thermometer, the temperature changes are translated into resistance changes.

The advantages of platinum resistance thermometers include:

Thermistors and resistance thermometers are resistors whose resistance changes when the temperature changes.

This style is popular with resistance thermometers, also known as resistance temperature detectors or RTDs.

The WMAP spacecraft's temperature is monitored with platinum resistance thermometers.

Resistance thermometers are constructed in a number of forms and offer greater stability, accuracy and repeatability in some cases than thermocouples.

A platinum or semi-conductor resistance thermometer in a high-frequency magnetic field is self-heated and leads to erroneous temperature measurements.

Some motor protection relays include temperature detector inputs for direct measurement from a thermocouple or resistance thermometer sensor embedded in the winding.

NTC thermistors are used as resistance thermometers in low-temperature measurements of the order of 10 K.

When temperature-dependent resistance of a component is used purposefully, the component is called a resistance thermometer or thermistor.

While thermocouples use the Seebeck effect to generate a voltage, resistance thermometers use electrical resistance and require a power source to operate.

(A resistance thermometer is made of metal, usually platinum, while a thermistor is made of ceramic or polymer.)

The four-wire resistance thermometer configuration increases the accuracy and reliability of the resistance being measured: the resistance error due to lead wire resistance is zero.

Platinum is used in catalytic converters, laboratory equipment, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, and jewelry.