Non-contact micro wave level switch for hazardous areas
ITECA SOCADEI
The Microwave Pulse Sender-Receiver System is composed by electrical isolated 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.
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