Model No: P-675
A platinum resistance thermometer (PRT) is a piece of platinum wire which determines the temperature by measuring its electrical resistance. It is referred to as a temperature sensor. When manufactured carefully, these devices offer an excellent combination of sensitivity, range and reproducibility.
PRTs work in the following way. The electrical resistance of many metals (eg copper, silver, aluminium, platinum) increases approximately linearly with absolute temperature and this feature makes them useful as temperature sensors. The resistance of a wire of the material is measured by passing a current through it and measuring the voltage across it with a suitable voltmeter. The reading is converted to temperature using a calibration equation.
The resistors are of manganin coils bridge wire is accurately calibrated. Vernier is attached to the sliding contact and fine slow motion available mercury contacts are fitted. Length of the slide wire is 30cm. Resistance values are 0.1, 0.2, 0.4, 0.8, 1.6, 3.2, 6.4, 12.8 and 0.15 ohm for 30 cm slide wire. Range of resistance measurable.
