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Overview
One of the major activities which everyone in the aircraft industry understands as to be a challenging task is that of refueling the aircraft. See how Parasnath Electronics with its innovative technology helped the aircraft industry solve this problem.

Challenge
Due to the capacity of the aircraft fuel tank and also because of huge size of the aircraft special mechanisms are needed to refuel the aircraft. Special vehicles with proper elevation tools need to be employed to refuel the aircraft. But the problem that is faced is that the coupling of the hosepipe refueling the aircrafts often breaks loose. This can happen due to the slightest movement in the vehicle, to which the hose pipe is attached. This leads to the spilling of the aircraft fuel thus increasing the operational costs. Also many a times a situation occurs when unaccounted fuel goes into the aircraft. This ends up creating a situation in which there is no accountability of the fuel that was actually exhausted.

Photoelectric proximity switches is sought for reliable detection of objects within a defined scanning range on a conveyor system. Objects, which reduce distance from scanning plane to sensor, are detected. Scanning range / switching point can be set by adjusting sensitivity.
Working Principal 
1- Diffused Types: 
These types of proximity switch of contned emitter and reciever in one unit.When the emitter emites the infrared signal which is reflected from the surface of the object to be detected and receiver and this will changed the output stage . 
2- Through Beam Type:
These types of proximity switch of contned seperate emitter and reciever in one unit . When the emitter emites the infrared signal and continously received by the receiver .When an object comes in between the emitter and receiver the siganal
3- Retroeflective Type:
These types of proximity switch of contned seperate emitter and reciever in one unit .And a reflector is used to reflect the zero diffused beam. When an object comes in between these two the beam is broken and the output will changed its signal photoelectric proximity switches are used to counting on Conveyor Belts , Webtewar , Monitoring , Sensing the end of a Roll etc.