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A hysteresis bimetal thermostat, also known as a snap-action thermostat or a
bimetallic thermostat, is a type of temperature control device commonly used in
various applications to regulate temperature by switching a circuit on or off.
The term "hysteresis" refers to the phenomenon in which the thermostat maintains
a temperature range instead of an exact set temperature, providing a more stable
and reliable control mechanism.
Here's how a hysteresis bimetal thermostat works:
Bimetallic Strip: The key component of the thermostat is a bimetallic strip.
It is made by bonding two different metals with different coefficients of
thermal expansion together. As the temperature changes, the two metals expand or
contract at different rates, causing the bimetallic strip to bend.
Contact Mechanism: The bimetallic strip is connected to a contact mechanism,
which is responsible for opening or closing an electrical circuit based on the
temperature change.
Set Temperature and Hysteresis: The thermostat has a set temperature that
determines when the circuit will be switched on or off. However, what makes a
hysteresis thermostat unique is that it has a temperature range rather than a
single set temperature. This range is called the "hysteresis band" or
"differential."
When the temperature rises and reaches the upper limit of the hysteresis
band, the bimetallic strip bends enough to actuate the contact mechanism,
opening the circuit. This stops the heating or cooling system. As the
temperature falls back within the hysteresis band, the bimetallic strip
straightens, and the contact mechanism closes the circuit again, allowing the
heating or cooling system to resume operation. Advantages: The hysteresis
bimetal thermostat provides a smoother and more stable temperature control
compared to a simple on/off thermostat with no hysteresis. The hysteresis band
prevents frequent and rapid cycling of the heating or cooling system, reducing
wear and tear on the components and providing better energy efficiency.
Hysteresis bimetal thermostats are commonly used in various household
appliances, HVAC systems, industrial equipment, and other applications where
precise temperature control is required. They are simple, reliable, and
cost-effective solutions for regulating temperature within a specific range.
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