In one example a fluid level sensing device is described. The device includes a sensing die having a number of fluid level sensors disposed thereon and a number of control devices, each control device corresponding to one of the number of fluid level sensors. A control device includes a comparing device to determine a state of a corresponding fluid level sensor. A state of the fluid level sensor is selected from the group consisting of a fluid state and a no fluid state. Each control device also includes a non-volatile memory device corresponding to the comparing device to indicate whether the corresponding fluid level sensor is at the fluid state or the no fluid state. A control device also includes a locking device to receive a write command and to irreversibly set the non-volatile memory device to the no fluid state based on the write command.

A portable fluid monitoring controller tester system for fluid monitoring equipment includes a control panel, electrical interfaces, and associated circuitry for simulating the fluid overfill sensors and other features of a trailer. The tester is a self-contained device that meets or exceeds various safety standards applicable to operating in an explosive environment. The tester may be powered, at least partially, by the fluid monitoring controller to which it is connected or from another power source, such as a battery. The tester has intrinsically safe outputs, and is configured to simulate different types of sensor systems found in fuel tanker trailers, including 2-Wire Optical, 5-Wire Optical, and Thermistor sensors. The tester is further configured to simulate ground circuits and the truck identification module (T.I.M.) of the fuel tanker trailer. The tester includes an enclosure that is impact and temperature resilient, and provides protection against windblown dust, rain and splashing water.

A perfusion system includes a fluid reservoir configured to hold a portion of fluid, the portion of fluid having a volume, the fluid reservoir having a total capacity that is greater than the volume; an imaging device, the imaging device configured to obtain image data corresponding to the fluid reservoir; and a controller. The controller is configured to receive the image data from the imaging device; determine the volume based on the image data; and facilitate control, in response to at least one of a user input and the determined volume of the portion of fluid, of an operating parameter corresponding to the fluid reservoir to facilitate changing or maintaining the volume of the portion of the fluid.

A method for checking operability of a first metering unit includes sending a control signal to a second metering unit to dispense a second quantity; comparing the quantity dispensed with the second quantity; sending a control signal to a second metering unit to introduce a third quantity; detecting the pressure drop caused by the introduction of the third quantity; sending a control signal to the first metering unit to introduce a first quantity; detecting the pressure drop caused by executing the control signal to introduce the first quantity; and ascertaining that the first metering unit is not functioning correctly if a difference between the pressure drop detected as a result of the execution of the control signal to introduce the first quantity and the pressure drop detected as a result of the execution of the control signal to introduce the third quantity is above a threshold.

This overfill prevention system probe for tanks for transport of liquid fuels comprises a level detector mounted on a support that is fixed on the tank so that the detector is placed in the tank at a maximum permissible filling height. The level detector includes a measuring sensor capable of providing a redundant level measurement.

This overfill prevention system probe for tanks for transport of liquid fuels comprises a level detector mounted on a support that is fixed to the tank so that the detector is placed in the compartment at a maximum permissible filling height. The level detector includes a measuring sensor comprising a set of several electrodes and means for measuring the dielectric permittivity of a fluid present between the electrodes. The probe also comprises means for testing the satisfactory operation of the entire acquisition chain of the dielectric permittivity measurement of the fluid present at the electrodes.

A measurement device has two electrodes in the liquid forming a capacitor the capacitance of which depends on the height of the liquid, a microcontroller connected to an electrode and having a capacitance determination circuit for determining first and second values of the capacitance of the capacitor respectively during charging and discharging of the capacitor, an oscillator circuit for generating signals at a reference frequency when the electrodes are not connected to the microcontroller, then at a variable frequency dependent on the height of the liquid when the electrodes are connected to the microcontroller. The microcontroller further includes a programmable logic device configured into a comparator circuit, and a frequency determination circuit connected to the programmable logic device so as to determine the variable frequency from the reference frequency and from the signals of the programmable logic device.

An apparatus for determining and/or monitoring the viscosity, the density and/or a predetermined filling level, having an excitation/receiving unit which excites a mechanically vibratable unit to vibrate, wherein a control/evaluation unit which is connected to the excitation/receiving unit and has a measuring branch and a checking branch separate from the latter is provided. The checking branch is configured to apply an excitation signal to the excitation/receiving unit, to receive the vibrations of the mechanically vibratable unit and to determine at least a first malfunction and a second different malfunction of the mechanically vibratable unit and/or of the excitation/receiving unit from the received vibrations, wherein the excitation signal of the checking branch has a continuous changing frequency which is described by a frequency/time function and passes through a plurality of modes of the mechanically vibratable unit.

An electrode-type liquid level detection device comprises: an electrode unit in which at least two liquid level measurement electrodes, which are used to detect a liquid level, and a calibration electrode, which is not used to detect the liquid level, are integrated; a record unit that records a pre-use resistance value of each electrode of the electrode unit as initial resistance value; a calculation unit that calculates a resistance value of a to-be-measured object based on the initial resistance value; and a control unit that controls in such a way as to adjust a threshold value for determining whether or not the to-be-measured object exists, based on a change in resistance values of the at least two liquid level measurement electrodes when in use. Therefore, the liquid level can be accurately detected corresponding to deterioration of the instrument.

A dispensing device and a method for dispensing liquids, in particular liquid medicaments, to persons, has a liquid-filled container an opening for dispensing the liquid at one end. A holder for holding an injection needle for injection of the liquid from the container are provided in the area of the opening. A measurement system determines a measured value, and a processing unit determines a parameter value, associated with the container, based on the measured value. At least one detection element is present at the opening and connected to a needle detection circuit. The needle detection circuit measures an electrical characteristic variable that can be picked up at the output of the detection element. The measurement result is fed to a processing unit, which calculates the parameter value and keeps it available at its output.