Posted to News on 28th Jan 2007, 11:05
Tempsonics GT position sensor has built-in redundancy
The new magnetostrictive Tempsonics GT ensures maximum safety for all applications where a failure would have disastrous effects on safety and cost. The redundant G-Series sensor measures critical variables by means of two or three independent, functionally identical measurement systems. They are completely independent and can be switched on individually.
Each measurement system comprises a basic sensor element, evaluation electronics with separate output signal and supply voltage. The basic elements are accommodated in a pressure-resistant stainless steel pipe for direct stroke measurement in hydraulic cylinders. The position non-contact magnet travels along the sensor rod, which emerges into the open piston and marks the measurement point through its wall. Pipe, thread and magnet have standard dimensions.
The position measurement validity is checked by totals formation with inverse output signal programming (4...20mA, 20...4mA, total = 24) or by difference formation (difference = 0). If variations are detected, remedial measures can be taken immediately.
MTS says the measurement accuracy of the Tempsonics GT offers the same well-proven performance as the standard sensors, but with linearity better than 0.02 per cent and repeatability better than 0.001 per cent. Due to the high linearity, even minimal measurement differences are identified, whereby the error tolerance can be adjusted individually and adapted to the application. The stroke length is also freely selectable within 25–1500mm.
At critical measurement points, the Tempsonics GT provides safe linear position measurement, protects against failure and ensures availability without immediate replacement. Applications for this system include: motor-actuated positioning at power station turbines; pitch adjustment of wind turbines or marine screw propellers; marine control systems; and flood gates.
