The PAB 20 is a 2-channel, multiplexed, photoelectric amplifier which is to be used in conjunction with two sets of remote light transmitters (LT) and light receivers (LR) from the series 100, 110, 120. The two channels operate independently of each other with their own set of transmitter and receiver. The multiplexing function ensures that optical cross talk between channels is prevented.
The amplifier series offers manual sensitivity adjustment for each individual channel, via an integral potentiometer located on the front panel of the amplifier. The series offers a choice between two individual/transistor outputs, with an adjustable 0-10 sec on/off time delay.
Up to nine amplifiers from the PAB 20A series can be connected via a bus rail connector positioned on the din rail, to form a modular master/slave system with a total of 29 channels. The bus connection enables communication between the amplifiers, which allows the channels of all the amplifiers to be multiplexed ensuring that optical cross talk between channels is prevented and allows a common output from the amplifier modules. Both the PAB 20A and PAB 20S can share power supply via the bus connection.
The amplifier offers a test input, which is used for either disabling or enabling the transmitting power temporarily for test purposes. The amplifier includes an alarm output, which is used to indicate if the signal level is insufficient or if a sensor is faulty. The sensor LED drive powers the optical monitor LED’s available on the remote sensors output (LT) and power (LR).
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