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The Bimetal thermometer employs a bimetal strip in the form of helix, it works on the principle of thermal expansion - two metals having different coefficient of expansions are joined together to form a bimetal. The resultant expansion of bimetal is proportional to temperature that is sensed. Bimetal dial thermometers are simple in construction, but rugged.
They are used for measurement of temperature in most of the industrial applications. They are offered in the range of (-) 50°C to 500°C. With rigid stem having bottom or back entry. It can also be offered in every angle rotatable construction at 180° A.
A pressure switch opens or closes a corresponding switch contact as soon as a preset pressure is reached.
Depending on the requirement and the design, pressure switches are used with mechanical or electronic switch contacts, with or without displays and with various setting possibilities. Pressure switches are used in a variety of industrial and technical processes.
Temperature transmitters convert the input signal from a wide range of sensors, such as resistance sensors and thermocouples, but in some cases also from potentiometers, into a standardised output signal (e.g. 0 ... 10 V or 4 ... 20 mA).
With digital temperature transmitters, the sensor type and the measuring span can be freely configured, along with many further options such as the error signalisation or a measuring location identification.
A Resistance Temperature Detector (RTD) senses heat, based on the principle, that a change in temperature, results in a corresponding change in the resistance of a wire. A small excitation current is passed along the element, the resultant voltage is measured and converted to units of temperature.
RTDs/TCs have achieved a well deserved reputation in various Industries for their superior stability and accuracy. The result makes these devices well suited for a wide variety of applications.
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