In some examples, a liquid container comprises a chamber forming a volume containing a liquid, an elongated strip extending into the volume containing the liquid, a plurality of heaters supported by the strip along the strip, and a plurality of temperature sensors supported by the strip along the strip. The temperature sensors output signals indicative of dissipation of heat from the heaters to indicate a level of the liquid in the volume.

A liquid level detection device detecting a liquid level of a liquid in a container includes a heater configured to heat the container, a plurality of temperature sensors provided at different heights of the container, and configured to detect a surface temperature of the container, and a controller configured to detect the liquid level of the liquid in the container, based on the surface temperature of the container detected by the plurality of temperature sensors when the heater is caused to heat.

In some examples, a liquid container comprises a chamber forming a volume containing a liquid, an elongated strip extending into the volume containing the liquid, the strip supported along a side of the volume such that a face of the strip adjacent the side of the volume is not opposed by the liquid, a plurality of heaters supported by the strip along the strip, and a plurality of temperature sensors supported by the strip along the strip.

A fluid characteristic sensing device has a projection. The fluid characteristic sensing device receives current pulses and directs the received current pulses through the projection. The received and directed current pulses enable determination of a resistance of the projection and a rate of change of temperature.

The invention relates to devices for detecting media.

These are distinguished, in particular, by the fact that simply the medium can be detected and/or properties of the or a medium can be determined or monitored.

For this purpose, a heating sensor comprising a heating device and at least one p-n junction operated in the forward direction and a reference sensor comprising at least one p-n junction operated in the forward direction are spaced apart from one another. The heating device and the p-n junctions are connected to a control device, which is a control device ascertaining the presence and/or at least one property of the medium from the thermal properties of the medium.

The invention relates to devices for detecting the fill level of media in containers.

The devices are distinguished, in particular, by a simple and reliable detection of the fill level.

For this purpose, multiple measuring points, each consisting of a series circuit of a resistor and a p-n junction, are spaced apart from one another. Each measuring point is connected, on the one hand, to an input of a multiplexer. On the other hand, the measuring points are connected to a reference potential. The output of the multiplexer is connected to a control device, wherein the control device is a control device periodically supplying a voltage to the measuring point connected to the control device via the multiplexer and measuring the voltage drop, a control device determining the medium from the temperature-dependent forward voltages resulting from the different thermal properties of the medium and a control device ascertaining the fill level from the consecutive measuring points.

A method of forming a fluid level sensor includes coupling an array of heating elements and sensors to a first side of a substrate. A second side of the substrate is coupled to a carrier. The method also includes coupling an electrical interface to the carrier and electrically coupling the array to the electrical interface via a conductive wire. The method further includes overmolding the electrical interface, the first side of the substrate, and the conductive wire to form an overmolded fluid level sensor. The carrier may be coupled to the second side of the substrate and the electrical interface via a releasable adhesive and may be removed after overmolding the fluid level sensor.

To provide a liquid level indicator and a liquid raw material vaporization feeder, in which the time to detect a switch from the liquid phase to the gas phase has reduced flow rate dependence, and also the detection time can be shortened. The present invention includes a chamber 2 that stores a liquid raw material, at least one protection tube 3 housing a resistance temperature detector for detecting the liquid level L1 in the chamber 2, and a flow controller 4 that controls the flow rate of the gas flowing out from the chamber 2 and feeds the same. The protection tube 3 is horizontally inserted into a sidewall 2a of the chamber 2 and fixed thereto.

A process control system can include a vessel, and at least one heat transfer property sensor that measures a heat transfer property of a substance at the vessel. The process control system can also include a monitoring device that receives an output of the heat transfer property sensor, and a process control device that is adjusted in response to the heat transfer property sensor output. A method of controlling a process can include measuring a thermal conductivity of a substance at a vessel, and adjusting the process in response to the measuring.

The liquid level meter according to the present invention includes a resistive temperature detector, a temperature measuring body located above it, a temperature detecting unit detecting temperatures of the resistive temperature detector and the temperature measuring body, a current controlling unit determining a current value to be flowed through the resistive temperature detector so that the resistive temperature detector and the temperature measuring body become a predetermined temperature difference, a power supply unit supplying the current of the determined current value to the resistive temperature detector, and a liquid level detecting unit detecting a position of a liquid level. The liquid level detecting unit detects the change in the relative position of the liquid level relative to the resistive temperature detector by determining whether a change width of the current value flowing through the resistive temperature detector during a predetermined period of time is positive or negative, and whether the change width is not less than a predetermined value. As a result, the position of the liquid level can be accurately detected without being affected by the variation in the characteristics of the resistive temperature detector.