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Temperature compensation techniques are widely applied in the instrumentation circuits used for electronic components, as well as in thermocouple cold junction compensation. These methods are also integrated into our pressure-sensitive resistors. Due to the self-heating characteristics of varistors, they can automatically regulate gain, making it possible to design amplitude stabilization 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. This is why varistors are often used in flow meters, gas analyzers, and thermal conductivity devices, allowing for the creation of specialized detection components.
Varistors are primarily used to protect electrical equipment from voltage surges and power fluctuations. In addition, they are essential in various applications such as overheat protection, contactless relays, constant temperature control, automatic gain control, motor start switches, line time delays, color TV degaussing, fire alarms, and temperature compensation. These functions all rely on the sensitivity of the resistor to temperature changes.
Despite their usefulness, varistors do have some disadvantages. The relationship between resistance and temperature is relatively nonlinear, and varistor components tend to have poor consistency and interchangeability. Furthermore, they are prone to aging and may lack long-term stability. Therefore, proper selection and application are crucial to ensure reliable performance in different environments.