What is bimetallic thermometer?
Bimetal thermometers are thermometers based on the functional principle that metals expand differently depending on the change in temperature. A bimetal thermometer always consists of two different metal strips that have a different thermal expansion coefficient.
What is working principle of bimetal thermometers?
Bimetal thermometers work on the principle that different metals expand at different rates as they are heated. By using two strips of different metals in a thermometer, the movement of the strips correlates to temperature and can be indicated along a scale.
What are advantages and disadvantages of bimetallic thermometers?
A thermometer comparison
| advantages | disadvantages |
|---|---|
| Bimetallic thermometer * | |
| cheap | requires frequent calibration to maintain accuracy |
| durable | fairly slow response |
| can be used for thermograph |
What is a bimetallic thermometer made of?
A bimetal thermometer uses a bi metal spring as temperature sensing element. This technology uses a coil spring made of two different types of metals that are welded or fastened together. These metals could include copper, steel, or brass.
Where are bimetal thermometers used?
Bimetallic thermometers are used in residential devices like air conditioners, ovens, and industrial devices like heaters, hot wires, refineries, etc. They are a simple, durable, and cost-efficient way of temperature measurement.
What is the difference between bimetallic and gas thermometer?
Gas filled thermometers have multiple advantages, including their ability to span a wider temperature range than bi-metal thermometers. A gas thermometer can measure temperature ranging from -200 to 800°C.
What are applications of bimetallic strips?
Usually steel and copper, or in some cases steel and brass is used in bimetallic strip. Two applications are: Used in fire alarms. Used in mechanical clocks to remove the error caused by temperature change.
What is the best method for calibrating bimetallic thermometers?
PUT THE THERMOMETER STEM OR PROBE INTO THE ICE WATER. Make sure the sensing area is under water and not touching the sides of the container. Wait 30 seconds or until the reading stays steady. ADJUST THE THERMOMETER SO IT READS 32°F (0°C).
What is the limitation of bimetallic thermometer?
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.
Is bimetallic strip used in thermometer?
use in thermometers The bimetallic strip constitutes one of the most trouble-free and durable thermometers. It is simply two strips of different metals bonded together and held at one end. When heated, the two strips expand at different rates, resulting in a bending effect that is used to measure…