Micro-Epsilon introduces capaNCDT 6110 capacitive sensor controller | Automation.com

Micro-Epsilon introduces capaNCDT 6110 capacitive sensor controller

Micro-Epsilon introduces capaNCDT 6110 capacitive sensor controller

July 10, 2014 - Micro-Epsilon introduces capaNCDT 6110 capacitive controller, suitable for measuring displacement, distance and position in applications, from test cells to on-vehicle testing, mobile applications and highly automated production environments.

Robust and simple to use, the capaNCDT 6110 is compatible with all capaNCDT series capacitive sensors from Micro-Epsilon. The measurement system comprises a capacitive displacement sensor, sensor cable, controller (electronics) and a supply/signal output cable. With all items available from stock, the user can quickly select the most suitable sensor range and cable length to be used with the capaNCDT 6110 electronics. The system offers high temperature stability (200ppm), maximum linearity of 0.1µm and maximum resolution of 0.005µm. Measurement output values are selectable 0-10V or +/-5V DC. Seven measuring ranges are available from 0.2mm up to 10mm.

Capacitive displacement measurement is one of the highest precision methods of non-contact displacement measurement. With the capacitive principle, sensor and target operate like an ideal parallel plate capacitor. The two plate electrodes are formed by the sensor and the opposing target. If an AC current with constant frequency flows through the sensor capacitor, the amplitude of the AC voltage on the sensor is proportional to the distance between the capacitor electrodes. An adjustable compensating voltage is simultaneously generated in the amplifier electronics. After demodulation of both AC voltages, the difference is amplified and output as an analogue signal.

Because the sensor is constructed like a guard ring capacitor, almost ideal linearity and resolution against metal targets is achieved. The technology also offers high temperature stability, as changes in the conductivity of the target have no effect on the measurement. Capacitive sensors can also measure insulators.

The technology is sensitive to changes in the dielectric sensor gap and so operates most effectively in clean, dry applications. Cable length is also relatively short due to the effect of cable capacitance on the oscillating circuit tuning.

Typical applications for capacitive displacement sensors can be found in automation systems, semiconductor production, mechanical engineering, medical devices, clean rooms, ultra-high vacuum (UHV) conditions, test cells and any application where high precision, stable measurements are required.

The capacitive measuring principle enables the rapid replacement of a sensor in just a few seconds. This simplified replacement of sensors with different measuring ranges and the interchangeability of capaNCDT controllers can be carried out without any re-calibration required. A typical sensor replacement takes around 5 seconds, unlike conventional systems that have to be subjected to time-consuming calibration and linearisation.