Optical Pyrometer Working

Optical Pyrometer Working: Optical Pyrometer Working – Any metallic surface when heated emits radiation of different wavelengths which are not visible at low temperature but at about 550 °C, radiations in shorter wavelength are visible to eye and from the colour approximate temperature is measured. The approximate values of temperature for colour (colour scale) is […]

Pyrometer Working Principle

Pyrometer Working Principle: Pyrometer Working Principle – When temperature being measured is very high and physical contact with the medium to be measured is impossible or impractical, optical pyrometers based on the principle of thermal radiation are used. These Pyrometer Working Principle are used under condition where corrosive vapours or liquids would destroy thermocouples, resistance […]

IC Type Sensor

IC Type Sensor: IC Type Sensor produces a voltage or current signal that increases with increase in temperature. IC Type Sensor eliminate the linearity errors associated with thermistor. However, being semiconductor devices, they are available in both voltage and current output configuration.  Figure 13.51 shows a National semiconductor LM335 IC temperature sen­sor. It provides a […]

Semiconductor Diode Temperature Sensor

Semiconductor Diode Temperature Sensor: Semiconductor Diode Temperature Sensor is a versatile device and finds use in many applications. Two of its parameter, that is forward voltage drop (Vf) and reverse saturation current (Is) are temperature sensitive. The sensitivity of Is with temperature is non-linear, but Vf has a linear temperature coefficient over a wide temperature range. Hence, Vf can […]

Thermocouple Circuit

Thermocouple Circuit: Thermocouple Circuit – One of the most commonly used methods of measurement of moderately high temperature is the thermocouple effect. When a pair of wires made up of different metals is joined together at one end, a temperature difference between the two ends of the wire produces a voltage between the two wires […]

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