| 主权项 |
1. A method of measuring a level of a material in a vessel, the method comprising the steps of:
placing at least two sensors proximate to the material in the vessel, a first sensor arranged to monitor a first range of levels in the vessel and a second sensor arranged to monitor at least a first level in the vessel, the first level being a part of the first range of levels; monitoring an output of the first sensor; determining the level of material in the vessel based on the output of the first sensor; monitoring an output of the second sensor; determining whether the output of the second sensor indicates a change in state of the second sensor; upon determining a change in state of the second sensor, determining a height error value; determining the level of material in the vessel based on the output of the first sensor and the height error value. |
