The minimum and maximum liquid levels are defined in section 6.4 for Grant accessory
baths. Liquid level should always be maintained between these levels. These levels
apply both when there are no vessels in the bath and with the maximum contents. If
using liquids that can evaporate then periodic checking and refilling should be completed.
The low level float switch will alarm if the liquid level drops below the minimum required
level and the unit will switch off the heater and stop temperature control.