A numeric sensor has four threshold settings: Lower Critical, Lower Warning, Upper Warning and Upper Critical.
The threshold settings determine how many sensor states are available for a certain sensor and the range of each sensor state. The diagram below shows how each threshold relates to each state.
above upper critical |
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above upper warning |
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normal |
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below lower warning |
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below lower critical |
The more thresholds are enabled for a sensor, the more sensor states are available for it. The "normal' state is always available regardless of whether any threshold is enabled.
For example:
Both states of "above upper warning" and "below lower warning" are warning states to call for users' attention.
Both states of "above upper critical" and "below lower critical" are critical states that require users to immediately handle.
The value of each enabled threshold determines the reading range of each available sensor state. For details, see: