A level sensing controller includes a signal generator circuit to generate an excitation signal. The controller also includes a connection to route an inverse of the excitation signal to a first polar electrode of a first capacitor. The first polar electrode is coupled to a container to hold liquid. The controller also includes a connection to route the excitation signal to a second polar electrode of a second capacitor. The second positive polar electrode is coupled to the container. The controller also includes a connection to a sense electrode to form the first capacitor with the first polar electrode and to form the second capacitor with the second polar electrode. The controller also includes a measurement circuit configured to measure charge at sensing electrode and determine, based on the measured charge, whether a liquid in the container has reached a level of the second polar electrode.

A capacitive level sensor device, for detecting the level of a medium contained in a container, comprises a circuit support, which extends longitudinally substantially according to level-detection axis. The circuit support has, in a detection region thereof, at least one first plurality of first capacitive elements, which comprise at least one first array of first electrodes (J), preferably spaced from one another along the level-detection axis, which are arranged in a position corresponding to at least one first side of the circuit support. The sensor device has a casing body which comprises an electrically insulating and fluid-tight detection portion, which covers the detection region of the circuit support. The detection portion of the casing body comprises an overmoulded outer coating, made of a first electrically insulating polymeric material, which defines an outer surface of the casing body designed to be in contact with the medium the level of which has to be detected. The first electrodes (J) are enclosed within the supporting structure of the circuit support at least at the detection region thereof, and, at least at the detection region, between the overmoulded outer coating and the supporting structure of the circuit support there is set at least one intermediate layer made of an electrically insulating material different from the first material.

A liquid detector comprising a housing having a plurality of side walls and a bottom surface; a sensor mounted within a cavity of the housing and having a sensing surface configured to detect a liquid on an outer surface of a first of the plurality of side walls, and securing means to secure the housing relative to a surface of an external reservoir, wherein the plurality of side walls extends from a top end to a lower end, wherein the bottom surface has a profile comprising a first portion and a second portion, wherein the first portion and second portion are lower than the plurality of side walls, and wherein at least a lower-most point of the second portion is lower than at least one point of the first portion.

Devices and corresponding methods for capacitive foam detection in liquid containers are disclosed. The device has a sensor with a measurement electrode having a plurality of sub-electrodes, a bottom plate that is used as a counter electrode for arranging a liquid container, a sensor electronic unit that is connected to the measurement electrode and the bottom plate and is adapted to determine an impedance, in particular a capacitance, between the measurement electrode and the bottom plate, and an evaluation unit, the measurement electrode being arranged substantially perpendicularly to the bottom plate.

A fluid property sensor may comprising an integrated circuit (IC) including a fluid level sensor, and/or a pressure sensor; and an external interface electrically coupled to a proximal end of the EC, wherein the pressure sensor may be configured to measure a flexure of the fluid property sensor.

An impedance limit switch is configured to determine a limit level of a medium. The switch may include a measuring probe having an oscillator circuit; and an electronic circuit configured to generate an excitation signal for the oscillator circuit. The electronic circuit is further configured to sweep a frequency of the excitation signal and determine a resonance curve of the oscillator circuit. The electronic circuit is further configured to adapt an amplitude of the excitation signal dependent upon the resonance curve in order to reduce an EMC radiation of the switch.

An angle detection device for a fuel fill level detection device, including: a support, a potting composition, which is arranged on the support in coherently bonded manner; a sensor for the contactless detection of an orientation of a magnetic field of a magnet, which is at least partly arranged in the potting composition, in particular on the support, and at least one conductor track which is arranged flat on the support, in particular in coherently bonded manner.

An analyzer for a grease interceptor for measuring levels of fat, oils, and grease (FOG), water, sludge and air having a probe which includes a controller and a sensor sub-unit. Sensor circuits include a microcontroller, timers, and sampling capacitors. The sensor sub-unit includes a plurality of electrode ring pairs coupled to a plurality of timers for converting capacitance measurements to frequencies under the control of a microprocessor in the controller. The frequencies identify the measured levels.

A physical quantity detection device including a container that is formed with an accommodation space accommodating a detection object formed of a dielectric, a first electrode and at least one second electrode that face with each other via the accommodation space, and an electrostatic capacitance detector that detects an electrostatic capacitance between the first electrode and the second electrode by applying an alternating current voltage between the first electrode and the second electrode. A frequency of the alternating current voltage applied between the first electrode and the second electrode is 1 kHz or higher.

An apparatus and method for preventing undue wear on a concrete pump relies upon monitoring a volume of water in a water box for cooling and lubricating pumping seals on a material pumping piston within a material pumping cylinder. The apparatus includes a water level sensor to generate signals corresponding to a water level in the water box. The signals are received at a computing device including a central processing unit (CPU) to apply an algorithm drawn from the memory to determine whether the water level in the water box is sufficient for operation of the concrete pump and if not sufficient, to generate a water level alert. The CPU sends a water-level alert and in response to the alert, to execute a pump-preserving action. Such a pump-preserving action may include sounding a klaxon alarm; displaying an alert; playing a recorded warning; and shutting down operation of the concrete pump.