Sensors for determining levels are widespread and can be found in a multitude of applications with completely different measurement tasks. Level sensors are a part of the current standard, for example, in the food and packaging industry, environmental engineering and in medical applications. The sensors can undertake the detection of a maximum or minimum level in different application domains. Another field of responsibility of level sensors is the use as a safety-relevant component. In this case, the level sensor is generally used to report an undesired penetration or leakage of water or other fluids. Distinction is basically made between three measurement principles for determining the levels: optical level measurement, mechanical level measurement and level measurement using ultrasound. The measurement principles are explained in detail below. We would like to support you in selecting the sensor suitable for your application on the basis of the broad range of sensors and measurement principles for level measurement.
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Whether for standard designs of optical or mechanical sensors or customised sensors, we remain at your disposal with our long-standing experience and know-how.
In case of optical level measurement, the presence or absence of a liquid is detected on the basis of the reflection of an IR beam. A light beam is emitted from an infra-red LED inside of the spherical or cone-shaped head of the sensor. There is no fluid on the sensor head if this light beam is completely reflected on a receiver, also inside the head. However if there is fluid in front of the sensor, the IR ray is refracted and not reflected with full intensity. The result is a switching operation in the evaluation electronics.
Depending on the configuration of the sensor, either the presence or absence of a fluid can trigger a switching operation. If you need information regarding these types of sensors, call us or write us an email. There already exists a multitude of models and specifications of the optical level sensors in the standard system. For requirements outside the standard, we shall modify and develop a suitable sensor with you (e.g. for aggressive media or high temperatures).
The sensor for the mechanical level measurement comprises a reed contact and a magnet. The electric circuit of the reed contact is opened or closed depending on whether the level of fluid increases or decreases. Here too, the measurement principle is a media contacting level sensor just like in case of optical level sensors. We can also help you in application domains outside the standard on the basis of our long-standing experience in developing and modifying such sensors.
The advantage of a sensor solution for the detection of levels using ultrasonic sensors has a basic difference with respect to float and optical level sensors: The measurement is not touch-operated. The sensors are thus very well suitable to record levels of media, which are very aggressive, i.e. are extremely acidic or basic. The sensors measure using the reflection of sound waves.
For this, a specific number of sound waves are transmitted by the sensor, which are reflected by the media to be measured, before they are recorded again by the sensor. The distance of the medium from the sensor can be determined using the time period of the sound waves between the transmission and reception.