Embodiments concern a high-precision, measurement device operative to measure the water content in media and/or water transport rate by media with high precision and with high dynamic range concerning the flow rate value. Based on a molecular transducer principle, captured water reacts with a reactant characterized by its ability to generate gas as a reaction product. By using an electro-chemical transducing element, an electric signal is generated in accordance with a stoichiometric volume of gas produced and water transferred, which is related to the flow rate of the circulating aqueous solution.

Methods and apparatuses for indicating the presence of a directional differential pressure between separated adjacent spaces are provided. A differential pressure set point indicator may be configured to correlate multiple potential angles of inclination of an elongated conduit to respective threshold differential pressures between two spaces which generate net flow of fluid sufficient to cause a lightweight ball to move from one region of the conduit to an opposing region. The elongated conduit may be adjustable in length so as to accommodate installation of the device into walls of varying thickness. The device may include a sound attenuator that reduces noise upon impact of the ball with either end of the conduit. The device may also include a sealing material that is flexible yet firm enough to provide both a seal with the exterior surface of the conduit and support for the conduit when oriented in a tilted configuration.

Methods and apparatuses for indicating the presence of a directional differential pressure between separated adjacent spaces are provided. A differential pressure set point indicator may be configured to correlate multiple potential angles of inclination of an elongated conduit to respective threshold differential pressures between two spaces which generate net flow of fluid sufficient to cause a lightweight ball to move from one region of the conduit to an opposing region. The elongated conduit may be adjustable in length so as to accommodate installation of the device into walls of varying thickness. The device may include a sound attenuator that reduces noise upon impact of the ball with either end of the conduit. The device may also include a sealing material that is flexible yet firm enough to provide both a seal with the exterior surface of the conduit and support for the conduit when oriented in a tilted configuration.

The invention relates to a method for measuring pressure differences in different premises of a building, in which the pressure difference is measured by means of one or more sensors (2) that measure absolute pressure. The measurement results obtained from the sensors (2) are combined with information on the efficiency of the ventilation of the building, and the pressure difference caused by ventilation is mathematically separated from the measurement result by making use of information on the ventilation efficiency at any one time.

The invention relates to a method for measuring pressure differences in different premises of a building, in which the pressure difference is measured by means of one or more sensors (2) that measure absolute pressure. The measurement results obtained from the sensors (2) are combined with information on the efficiency of the ventilation of the building, and the pressure difference caused by ventilation is mathematically separated from the measurement result by making use of information on the ventilation efficiency at any one time.

A pressure-equalization element for equalization of pressure differences between at least two spatial areas assigned to a field device used in automation technology, comprising a main body, consisting of a securing element having an axial bore, that is used for securing the pressure-equalization element in a wall of the field device, and a disc-shaped carrier component having a lateral end surface. The disc-shaped carrier component is provided with a specified number (n, where n>2) of substantially radially-running recesses corresponding to the axial bore, wherein the radially-running recesses are offset from one another by a defined angular offset, and wherein the radially-running recesses are provided with a gas-permeable, liquid-barrier membrane in the region of the lateral end surface of the disc-shaped carrier components.

A pressure-equalization element for equalization of pressure differences between at least two spatial areas assigned to a field device used in automation technology, comprising a main body, consisting of a securing element having an axial bore, that is used for securing the pressure-equalization element in a wall of the field device, and a disc-shaped carrier component having a lateral end surface. The disc-shaped carrier component is provided with a specified number (n, where n>2) of substantially radially-running recesses corresponding to the axial bore, wherein the radially-running recesses are offset from one another by a defined angular offset, and wherein the radially-running recesses are provided with a gas-permeable, liquid-barrier membrane in the region of the lateral end surface of the disc-shaped carrier components.

A pressure sensor having a housing with a control and evaluation unit, wherein a plurality of pressure ports are arranged at the housing of the pressure sensor, wherein a pressure measuring cell is associated with every pressure port, wherein the pressure measurement cells are connected to the control and evaluation unit, wherein the pressure sensor has at least one digital output interface, and wherein at least one pressure port is a port for inserting a pressure line, with the pressure line being installable without tools and with the pressure line being surrounded by a seal of the pressure port and being secured against being pulled out.

A temperature compensated differential pressure system is provided. The system includes a pair of flanges affixed together each having a flange diaphragm therein, wherein a plurality of capillary tubes extends between the pair of flanges and a pair of opposed remote diaphragm housings. The remote diaphragm housings include a remote diaphragm therein, wherein the remote diaphragm displaces a fill fluid in pressure capillaries to displace each flange diaphragm to detect a differential pressure between each location of the remote diaphragm housings. A compensating capillary extends from the remote diaphragm housings to an opposing flange diaphragm, wherein the compensating capillary is not in operable communication with the remote diaphragms. As such, any fluctuation in fill fluid volume of the compensating capillaries due to temperature fluctuations is applied to an opposing flange diaphragm to cancel temperature effects from the differential pressure determination.

A temperature compensated differential pressure system is provided. The system includes a pair of flanges affixed together each having a flange diaphragm therein, wherein a plurality of capillary tubes extends between the pair of flanges and a pair of opposed remote diaphragm housings. The remote diaphragm housings include a remote diaphragm therein, wherein the remote diaphragm displaces a fill fluid in pressure capillaries to displace each flange diaphragm to detect a differential pressure between each location of the remote diaphragm housings. A compensating capillary extends from the remote diaphragm housings to an opposing flange diaphragm, wherein the compensating capillary is not in operable communication with the remote diaphragms. As such, any fluctuation in fill fluid volume of the compensating capillaries due to temperature fluctuations is applied to an opposing flange diaphragm to cancel temperature effects from the differential pressure determination.