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Temperature compensation techniques are widely applied in both the instrumentation lines of electronic circuits and the cold junction compensation of thermocouples, which are essential features in our pressure-sensitive resistor design. Due to the inherent self-heating characteristics of varistors, they can naturally provide gain control, making it possible to construct amplitude-stabilizing circuits, delay circuits, and protective circuits.
However, it's important to note that when the ambient temperature is significantly lower than the self-heating temperature of the varistor, this situation is closely related to the heat dissipation conditions of the system. Therefore, we often utilize the thermal sensitivity of varistors in flow meters, gas analyzers, and thermal conductivity sensors, allowing for the development of specialized detection components.
Varistors are commonly used to protect electrical equipment from voltage surges and overcurrents. In addition, they are also used in applications such as overheat protection, contactless relays, constant temperature control, automatic gain adjustment, motor start switches, line time delays, TV automatic degaussing, fire alarms, and temperature compensation.
Despite their versatility, varistors do have some limitations. The relationship between resistance and temperature is relatively nonlinear, and varistor components tend to have poor consistency and limited interchangeability. Moreover, they are prone to aging over time, leading to reduced stability and reliability.
In summary, while varistors offer a wide range of applications due to their thermal sensitivity, users should carefully consider their non-linear behavior and long-term performance when integrating them into circuit designs.