The FLT9700 series of Microwave Level switch
The FLT9700 series of Microwave Level switch normally consists of two parts; a transmitter and a receiver placed on the outside walls of a tank or vessel, on opposite sides. The transmitter emits a burst of microwave energy towards the receiver. This burst of energy is transmitted approximately 200 times each second. If a sufficiently reflective or absorbent material interrupts the line of sight between these two units, the energy will not reach the receiver. Any loss in signal at the receiver will trigger a change of state and operate a relay to indicate high or low condition. The sensitivity is adjustable to cater for a wide range of materials.