Amplifiers for optical sensing applications

May 2003 Sensors & Transducers

The PA 01 photoelectric amplifier is designed for use with a set of remote transmitter LT and receiver LR transducers from the series 101, 100, 110 or 120.

This amplifier series offers a choice between automatic and/or manual sensitivity adjustment with or without a 0-10 sec on/off time delay via integral potentiometers located on the front panel of the amplifier. Output can be selected from either a relay or an NPN/PNP transistor output. Light or dark function and long or short range is switch selectable.

In automatic mode, set-up is required. This is achieved by pressing the teach-in button located on the front panel. This unique feature ensures that the transmitting power level is adjusted according to the application, thus achieving optimal hysteresis and excess gain. Once set up, the system will automatically compensate for moderate misalignment and contamination during operation. In manual mode, the teach-in button allows for an overall manual system test by temporarily disabling the transmitter. The sensor LED drive powers the optional monitor LEDs available on the remote sensors - output (LT) and power (LR).

The patented feature STF allows up to three identical systems to operate within a close distance of each other without optical cross talk as each system automatically maintains different transmitter frequencies.

For more information contact Telco-Gail Norton Instrumentation, 031 701 4861.

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