2.3 Identify the possible sensors that will give you the required output for use in a control system and/or display. (a) Monitor the level of the liquid to indicate when the level falls below some critical value. (2) (b) Determination of the temperature of the liquid in the range of 0100C where only rough accuracy is required. The situation might be the determination of the temperature of the cooling water as a pointer moving across a scale marked to indicate safe and unsafe operating temperatures. (2) (c) To monitor the temperature of the furnace operating from room temperature up to 500C with an accuracy of plus or minus few degrees. (2)