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Further options allow control over the time the audible alarm sounds for and how often the measurements
are refreshed in the panel.
Hysteresis
Hysteresis prevents the signal lamp from changing colour on small changes close to the zone boundary.
This prevents the signal lamp from flickering between different colours when the measurement fluctuates
close to the zone boundary. For example, if the zone boundary was at 30C and the actual air temperature
was 29.5C, local air currents could easily cause the reading to drift over 30C which could trigger an alarm.
The measurement would quickly return to normal and the alarm cancelled, but it would be disruptive
should this occur repeatedly.
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