The Microwave Pulse Sender-Receiver System is composedof electrical isolation units : the sender unit and the receiver one.
The sender emits a burst of microwave energy towards the receiver. This burst of energy is transmitted approximately 200 times each second.
When the line-of-sight between the sender and receiver is clear, the receiver will detect each of these bursts. If the line-of-sight is interrupted by a sufficiently reflective or absorbent material the energy will not detect the transmission.
The receiver is designed to switch a relay when the beam is cut.
In each case the relay will switch only after the detector state has been maintained (since its change) for the respective time: any further change of state during a time out period will override the previous change.
The sensitivity of the detector is adjusted by a potentiometer that can compensate for partially reflective or partially absorbing materials. In the same way, it can be adjusted so that it will change state when only a fraction of the beam is blocked. There are two sensitivity adjustment potentiometers.
The relay can be set to either energize or de-energize when the beam is broken. This mode is set via a two-position slide switch in the receiver unit.
In the receiver unit there are three LED lamps :
1 LED indicates that power is applied
1 LED indicates that a valid signal is detected
1 LED indicates that the relay is energized
Main Advantages :
Low frequency for dusty environment
Replacement for gamma ray
Easy to install
Measurement during filling or emptying
High and bottom level detection
Detection without any contact with the product, suitable for high temperature and big particle size, and hard applications.
