Turbocharger speed measured at high precision

November 05, 2014 // By Christoph Hammerschmidt
Sensor company Acam-messelectronic GmbH has improved the sensitivity of its sensor family for turbocharger speed measurement. The new PT2G series is designed for very high operating temperatures - and it is capable of securely detect titanium compressor wheels.

Measurement is performed by the Picoturn system through non-contact scanning of the individual aluminum or titanium blades of the compressor wheel, and can determine rotational speeds of up to 400,000 rpm. The high sensitivity allows for a large distance between the sensor and the rotating blade in the range of 1 to 2 mm, depending on the thickness of the blade.

Acam has now strongly improved the sensitivity of its Picoturn standard series. The PT1G and PT2G series master complex installation situations and measure most standard titanium compressor wheels. The sensors is still offer rotationally symmetrical sensitivity characteristics, which allows for easy installation and sensor replacement in quick test mode. The new PTMB-V6.2 controller also increases the sensitivity of the sensors. The number of blades can be adjusted from 1 to 15 or from 16 to 31, and the box provides a digital pulse interface as well as an analog voltage interface (0.5 V – 4.5 V).

Thanks to a newly developed sensor head, the sensitivity of the new H-sensors from the Picoturn 2G line was improved by a factor of 2 compared to standard types. The “H” in the name of the new PT2G-HT line stands not only for high sensitivity, but also for a higher temperature range. Here Acam addresses all the manufacturers who either struggle with particularly high temperatures of up to 270°C or more, or must reliably detect certain “persistent” titanium compressor wheels. The HT series is the problem solver, even for the most difficult of measuring tasks. Again, rotational symmetry can be obtained. The sensors are available in two thread types and various lengths. All Picoturn sensors are compatible with each other.

More information: www.acam.de