Turck LI Linear Sensors
Turck’s enhanced Li linear position sensors measure position values at a frequency of 5 kHz – at measuring lengths of up to 2 m
Turck has updated its contactless Li Q25 positioning systems and has now added new Extended variants to the program. The inductive measuring principle offers improved shock resistance and sampling rate compared to alternative measuring systems. With measuring lengths of up to 2 m, the Li sensors outperform magnetostrictive linear position sensors, which, due to their operating principle, sense at a slower rate as the measuring length increases.
The Extended series of the IP67 sensors are not only resistant to harsh environmental conditions such as from humidity and dirt. These devices reliably output a position signal when subject to vibration or shocks of up to 200 g. The 5 kHz scan rate keeps positioning errors to a minimum – something that was previously unachievable in rugged applications. Precision has also been further increased with a 16-bit D/A converter.
Li sensors, with their immunity to magnetic fields, are generally ideal for closed-loop control tasks in the metalworking industry, as the metal shavings accumulated here do not stick to the positioning element inducing linearity errors. Thanks to their shock resistance, they can be used for position measurement in presses and punching machines without any problems, as well as in wood processing or injection molding machines.
The Li linear position sensors always supply their output signal twice; as a 0 – 10 V signal and as 4 – 20 mA signal. This makes it possible to connect diagnostic systems and also reduces the number of device variants to be kept in reserve. Turck is offering the new devices in measuring lengths of 100 to 2000 mm.
Product Features & Benefits
■ Excellent linearity properties even under extreme shock and vibration loads Due to the contactless coupling between the positioning element and the built-in track board in the sensor, the sensor is extremely immune to shock and vibration. The sensor housing is extremely robust and can also be used in demanding applications with high shock loads, e.g. on presses. The sensor is not destroyed. In addition, the quality of the sensor signal is not affected, even under a shock load of up to 200 g. The sensor signal is not affected by the shock. The Li-Q25L series convinces with outstanding linearity characteristics that do not change even in a shock-loaded environment.
Shock-resistant Linear Position Sensors up to 200 g
■ High sampling rate 5 kHz In contrast to conventional contactless systems, the inductive measuring principle is not based on a travel time measurement. Therefore, longer detection ranges can be sampled just as quickly as shorter ones. An increased sampling rate is particularly important where control quality is important. It is up to five times faster than with conventional systems. ■ High resolution 16 bit The new Li generation uses a 16-bit converter as standard, which guarantees a high-resolution output signal even with long sensor versions offering large measuring ranges.
■ Automatic error diagnostics The inductive linear position sensors indicate the current operating status via a diagnostic LED. If, for example, the distance between the sensor and the positioning element is likely to become too large, this is indicated by a yellow LED. The new generation also offers an error signal in the process output of 24 mA or 11 V as soon as the distance between the sensor and the positioning element is outside the permissible range. This information can be easily evaluated in the controller and facilitates the error diagnostics of a machine.