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Self-adjusting capacitive sensors

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article image Ifm efector's new intelligent level sensors.

SPECIALLY designed for level sensing applications with liquids, granules and powders, the new KN family of capacitive sensors from ifm efector incorporates a dedicated microprocessor system which makes the sensors self adjusting.

In most applications, setting up involves no more than simply pressing a button on the sensor while the level is low.

Further adjustment is rarely necessary but, in demanding applications, users can repeat the process when the level is high to ensure that the sensor is seeing an adequate change in signal strength.

The setting system incorporates a locking sequence which protects against unwelcome adjustment of the settings. Should the sensor be mounted in an awkward location, the setting procedure can be carried out remotely by applying a voltage signal to the sensor's programming wire.

Power-on and switching status are indicated by LEDs, and a third warning LED operates if the low-level signal changes significantly during normal operation, because of build-up or changes in the target medium.

This warning is also available in the form of an output signal which can be fed to a programmable controller.

Ifm's charge-balance technology has been used for these sensors, making them virtually immune to interference from electrical noise. Capacitive switches with this innovative sensing technology are the only ones which meet fully the generic standards for EMC.

Ifm's new KN capacitive level sensors are available in flush-mounting versions for fitting in vessel walls to monitor levels of dry bulk materials, and non-flush versions which sense through the walls of the vessel, and can be used with both dry materials and liquids.

Both types feature IP67 environmental protection, and can detect media with a temperature range of -25° to +80°C.

The sensors are designed for use from dc supplies in the range 10 to 36V, and have outputs which are protected against short circuits, overloads and reverse polarity. Connections to the sensors are made via standard Ml2 connectors.

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