Low-cost ultrasonic probes

February 2005 Level Measurement & Control

GPC has released a family of ultrasonic probes that are suitable for measuring from 130 mm to 27 m with 1" NPT, 1,5" NPT, 2" NPT, 3" NPT and 6" NPT mountings. The new ultrasonic transducers (with high efficiency, narrow beams and wide frequency bandwidth) work under many conditions over a wide temperature range. They are insensitive to mountings and with help of the transceiver and smart signal processing, they eliminate unwanted echoes from tank walls, standpipes and product buildup.

The transducers provide a self-cleaning operation that sheds product build-up and condensation from their faces. The ultrasonic probes adapt to any environmental conditions, their power and receiver sensitivity adjust automatically to any distance and reflecting object.

The AGC system keeps the echo amplitude constant over the designed operating range. Built in communication with a PC allows storage of the current output and temperature in a datalogger. The ultrasonic probes can be connected in the network using RS485 with GPC's protocol and Modbus RTU.

Connecting to a PC provides access to a diagnostics utility, allowing the user to determine when there is loss of echo, temperature sensor failure, noise error, etc. Echo profiles and echo stability chart can be accessed with the software and some parameters can be changed, including reference setting and other calibration settings.

For more information contact Gauteng Process Control, 011 609 0749.

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