what is temperature hysteresis?

Question

i was reading ADT7310 temperature sensor datasheet and found out this term "temperature hysteresis".
Anyone has any idea what this term means.thnx

Answer 1

Hysteresis is a dependence on history.



As an example, you could create thermostat that has a setting such that a heater turns on when the temperature is below 60 and off when the temperature is above. But what happens when the temperature is almost exactly 60? It could be that just walking by the unit drives some air that makes it move just to the other side of 60. The heater could cycle on and off quickly. Instead a real thermostat has a hysteresis such that this can't happen. It could be set to come on at 60, but if it does so, it won't turn off until it hits 61. This means that the behavior of the thermostat at temperatures between 60 and 61 depends on the history of how it got there.



For a temperature sensor, I assume this means that if the temperature is rising and then appears to fall slightly, it won't report the lower temperature unless the drop exceeds the hysteresis quantity.

Answer 2

Temperature Hysteresis

Answer 3

Typical thermostats usually have a hysteresis switch on the back that allows you to select either 2 degree or 5 degree. Lets say you set it on 2 degree hysteresis and want the heater to come on when the temperature drops below 70 degrees F. When the temperature falls below 70F, the heater will turn on. Because of the 2 degree hysteresis setting, the thermostat will keep the heater running until the temperature rises to 72F (70 + 2). If you set the hysteresis switch to 5 degree, the thermostat would keep the heater running until it reaches 75F. This is the case when the trigger temperature is reached by a falling temperature. If we use the same settings, but switch the thermostat to cooling mode, the AC kicks on at 70F, but doesn't turn off until the temperature reaches 68F. So hysteresis refers to the "memory" of the thermostat to continue heating or cooling to 2 degrees above or below the set trigger temperature, depending on whether the ambient temperature is rising or falling when the trigger temperature is reached.

Most simply put, hysteresis is how many degrees above or below the set temperature that the thermostat will continue to heat or cool to. It is a "buffer range".

Answer 4

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In physical science, freezing or solidification is the process in which a liquid turns into a solid when cold enough. The freezing point is the temperature at which this happens. Melting, the process of turning a solid to a liquid, is almost the exact opposite of freezing. All known liquids undergo freezing when the temperature is lowered enough, with the sole exception of liquid helium, which remains liquid at absolute zero and can only be solidified under pressure. For most substances, the melting and freezing points are the same temperature, however, certain substances possess differing solid-liquid transition temperatures. For example, agar melts at 85 °C (185 °F) and solidifies from 31 °C to 40 °C (89.6 °F to 104 °F); this process is known as hysteresis.

Answer 5

Water is usally connected with the word, "Subfreezing". It's in reference to ice , snow, sleet or freezing rain. Water freezes at 32 degrees F or 0 degrees C. Temperatures below those marks are sub or below freezing