Bi metala temperature element measurement.pptx
- 1. Bimetallic sensor & its Industrial application
- 2. What is a Bimetallic Sensor ? The bimetallic thermometer consists of a bimetallic strip. A bimetallic strip is made of two thin strips of metals which have different coeffcients of expansion. The two metal strips are joined together by brazing, welding or reveting so that the relative motion between them is arrested.. Bimetallic strip: fixed end (A), free end (B), deflection (C), bimetallic strip (D)
- 3. Working Principle of a Bimetallic Sensor Two basic principles of operation is to be followed in case of bimetallic Sensors. A metal tends to undergo volumetric dimension change ( expansion/ contraction) according to change in temperature Different Metals have a different co-efficient of temperature. The rate of volumetric change depends upon this co-efficient of temperature. When exposed to temperature changes, these metals expand or contract at different rates, leading to the bending or deflection of the bimetallic strip. This bending or deflection is directly proportional to the temperature change, allowing for temperature measurement and control.
- 4. Working Principle of a Bimetallic Sensor The deflection of the metal is directly proportional to the length of the strip and the variation of temperature and is inversely proportional to the thickness of the strips.
- 5. Types of Bimetallic Sensors Most common forms of bimetallic sensors are listed. 1. Helix type. 2. Spiral type. 1.Helical Bimetallic Thermometer In several industries, helical type bimetallic thermometers are used. helical type bimetallic thermometers are very useful where Separating the pointer from the bimetallic coil may be necessary in particular circumstances. The temperature measurement sensor must remain inside the pipe, and it is possible to show the temperature on the pipe’s outside.
- 6. Types of Bimetallic Sensors Spiral Bimetallic Thermometer: A spiral bimetallic thermometer is depicted in figure. In this thermometer, the pointer mounted in a housing with a scale is attached to the spiral bimetallic (strip) element. When heated, the spiral bimetal rotates in a clockwise direction and bends in the direction of a metal with a low thermal coefficient of expansion. As a result, the associated pointer travels on a calibrated scale to display the temperature.
- 7. Advantages of Bimetallic Sensors Cost-effective: Bimetallic sensors are relatively inexpensive to manufacture compared to other types of sensors. Wide temperature range: Bimetallic sensors can operate effectively across a broad temperature range. Robust and durable: These sensors can withstand harsh environments and exhibit excellent resistance to corrosion. Simple and reliable: Bimetallic sensors have a straightforward design and offer reliable temperature measurements.
- 8. Disadvantages of Bimetallic Sensors Some disadvantages of bimetallic thermometers are: They are not advised to use for very high temperatures. They may require frequent calibration. May not give an accurate reading for low temperature. Calibration is disturbed if roughly handled
- 9. Industrial Applications of Bimetallic Sensors The applications of bimetallic thermometer are Used in control devices A spiral strip-type thermometer is utilized in AC thermostats. The helix strip type is used in refineries, tire vulcanizes, oil burners These thermometers are utilized in household devices which include AC (air conditioner), oven, and apparatus in industries like hot wires, refineries, tempering tanks, heater, etc.
- 10. Industrial Applications of Bimetallic Sensors Industrial applications of bimetallic sensors are diverse and can be found in various sectors. Here are some notable examples: HVAC Systems: Bimetallic sensors, particularly bimetallic thermostats, are commonly used in heating, ventilation, and air conditioning systems. Industrial Processes: Bimetallic sensors find application in industrial processes that require temperature monitoring and control. Bimetallic thermometers are used to measure and display temperature changes in manufacturing processes, ensuring that desired temperature ranges are maintained for optimal production conditions Automotive Industry: Bimetallic sensors play a crucial role in automotive applications. They are utilized in temperature gauges to monitor engine coolant temperature, oil temperature, and exhaust gas temperature. Bimetallic thermostats are employed in engine cooling systems to regulate the flow of coolant.
- 11. Industrial Applications of Bimetallic Sensors Household Appliances: Bimetallic sensors are found in various household appliances. For example, ovens use bimetallic thermostats to regulate temperature and ensure consistent cooking conditions. Refrigerators employ bimetallic sensors to control temperature and defrost cycles. In conclusion, bimetallic sensors have significant industrial applications, ranging from HVAC systems and industrial processes to the automotive industry and household appliances. Their ability to detect and measure temperature changes through differential expansion makes them valuable tools for temperature monitoring and control in diverse industrial settings.