Double panel detectors for copper laminated panels (PCBs) are designed for detecting double or multiple panels on automated de- stacking units and transfers. The detector consists of a pair of sensors and an amplifier. The panel to be checked is passed through the gap between both sensors Single panel passes through the sensor´s gap and do not activate the relay of amplifier. If two or more panels passes through the sensor´s gap the relay is activated. The output change over contact (SPDT) can be used to switch off the panel conveyor and/or for activating optical / acoustical alarms.There is also an amplifier available that has an analog voltage output of 0- 10 VDC instead of the output contact. This voltage co- relate to the copper laminate thickness of the PCB. This amplifier can be used in connection with a PLC/ IPC/ controller that has an analog voltage input for example for min./max limit   monitoring, remote control monitoring, "teach- in" programming with a sample PCB etc.

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New ! (Fig 1) "All in one" double sheet sensors with analog- or digital- output. No additional amplifiers / controllers are necessary. These sensors contains all parts, connector, indicator LED etc. and are therefore low prices units. The analog sensors have 1 - 10 VDC outputs. The digtal sensors have 2 switch outputs: One for 0/1 panel and one for 1/2 panels. The sensor is teach-in Cu-layerthickness programmable with a reference panel. It also can be used for to discriminate / monitor panels in the 18, 35, 70, 140...mym  ( 1/2 , 1 , 2 , 3 ... oz/sq.ft  ) Cu- layerthickness steps. 

Fig. 1 New "All in one" Double Panel Sensors with analog- or digital- output

Fig.2 Double Panel Detector with bothsided sensors