The Multiplexed Amplifiers MPA 81 Series is manufactured by TelcoSensors. The product is an 8-channel, multiplexed photoelectric amplifier, which is to be utilized in conjunction with 8 sets of remote transmitters LT and receivers LR, from the series 100, 110 and 120. The operation mode and the maximum sensing range is either thru-beam that measures 0-35 m or diffuse proximity that ranges from 0-2 m. Lastly, the product has adjustable on and off time delay and it has manual sensitivity adjustment.