Equipments - Barrier
 

Laser Light Barrier

The LLB unit is mounted on a mast holder bracket and can be precisely adjusted by means of fine pitch screws in combination with strong dish washer springs for long term position stability.
The attached sun roof protects against heat as well as unwanted light to the receiver section. The units are available in three versions, as a pure transmitter (Tx), receiver (Rx) and a combined transmitter and receiver (Rx/Tx). The latter one is used in a chain, whereby the receiver and a single transmitter are forming the beginning or the end of the chain.

Transmitter
20.040.1000

A Laser Light Barrier chain starts with a transmitter. For this purpose the model LLB-Tx is used, which only contains the Laser transmitter section. The housing is the same as the other models; however the receiver section has been left empty.

 

Single chain arrangement, a maximum distance of 500 m can be covered.
 

Transmitter & Receiver
20.040.1004

As an intermediate element of a chain this model is used. It provides on one side the receiver and on the other side the transmitter section. In order to form also curved line structures, the transmitter optics can be tilted by max. 3° suitable for polygonal approaches of circular perimeters.

LLB Chain, the maximum distance between to modules is 500 m, however can be extended without limits
 

Junction Box JB-LLB24
20.040.1050

For the operation of the LLB, the DC power supply for the Laser transmitter as well as for the electronic board is provided by the junction box. The emitted Laser light is modulated by a certain frequency to which the receiver only reacts. In case the barrier is interrupted or the transmitter fails, an alarm signal is generated. Via the RS485 data interface the state of the LLB is requested by the central alarming unit located in the central rack inside the main control room.
Four Laser Light Barriers can be connected to a single junction box (20.040.1052). The electronic board inside the weather proof housing (IP65) is also equipped with the RS485 bus interface which is connected either via two wires, or to cover longer distances via a pair of glass fibres, to the other members of the LLB chain and finally to the alarming processor inside the control room.