A half cell for an electrochemical sensor includes: a housing having a chamber, wherein the chamber includes an electrolyte; an electrically conductive lead in contact with the electrolyte; and a closure element connecting the lead to the housing, wherein the lead has a coating, and the coating includes molecules including a first functional group, which enables the molecule to interact chemically with the lead, and a second functional group different from the first functional group, which enables the molecule to interact chemically with the closure element, wherein a first portion of the molecules with the first functional group are in an intermolecular connection with the lead and the first portion of the molecules and/or a second portion of the molecules with the second functional group are in an intermolecular connection with the closure element.

A half cell for an electrochemical sensor includes: a housing having a chamber, wherein the chamber includes an electrolyte; an electrically conductive lead in contact with the electrolyte; and a closure element connecting the lead to the housing, wherein the lead has a coating, and the coating includes molecules including a first functional group, which enables the molecule to interact chemically with the lead, and a second functional group different from the first functional group, which enables the molecule to interact chemically with the closure element, wherein a first portion of the molecules with the first functional group are in an intermolecular connection with the lead and the first portion of the molecules and/or a second portion of the molecules with the second functional group are in an intermolecular connection with the closure element.

A probe for measuring a sample solution includes an outer body configured to receive an operational amount of a reference solution, and a sensor assembly including an inner body at least a portion of which is located inside the outer body. A shield is positioned between the outer surface of the inner body and the inner surface of the outer body. The shield is configured to be in contact with the reference solution and extends above the top surface of the reference solution when the probe is filled with an operational amount of the reference solution.

A probe for measuring a sample solution includes an outer body configured to receive an operational amount of a reference solution, and a sensor assembly including an inner body at least a portion of which is located inside the outer body. A shield is positioned between the outer surface of the inner body and the inner surface of the outer body. The shield is configured to be in contact with the reference solution and extends above the top surface of the reference solution when the probe is filled with an operational amount of the reference solution.

A pH sensor includes a glass electrode unit to respond to pH; a comparative electrode unit to be measured for its potential relative to the glass electrode unit; a main pipe to convey test liquid; and a fluid inlet connected to the glass electrode unit and the main pipe. The glass electrode unit includes: a first storage unit filled with electrolyte solution; a first electrode to electrically connect the inside and outside of the first storage unit; a glass film disposed between the first storage unit and the main pipe; and a first pressure transmission unit connected to the fluid inlet. The first pressure transmission unit regulates the internal pressure of the first storage unit to control the pressure difference between the first storage unit and the main pipe separated by the glass film. The comparative electrode unit includes: a second storage unit filled with buffer solution; a second electrode to electrically connect the inside and outside of the second storage unit; a liquid junction unit disposed between the second storage unit and the main pipe; and a second pressure transmission unit connected to the fluid inlet. The second pressure transmission unit regulates the internal pressure of the second storage unit to control the pressure difference between the second storage unit and the main pipe separated by the liquid junction unit.

A pH sensor includes a glass electrode unit to respond to pH; a comparative electrode unit to be measured for its potential relative to the glass electrode unit; a main pipe to convey test liquid; and a fluid inlet connected to the glass electrode unit and the main pipe. The glass electrode unit includes: a first storage unit filled with electrolyte solution; a first electrode to electrically connect the inside and outside of the first storage unit; a glass film disposed between the first storage unit and the main pipe; and a first pressure transmission unit connected to the fluid inlet. The first pressure transmission unit regulates the internal pressure of the first storage unit to control the pressure difference between the first storage unit and the main pipe separated by the glass film. The comparative electrode unit includes: a second storage unit filled with buffer solution; a second electrode to electrically connect the inside and outside of the second storage unit; a liquid junction unit disposed between the second storage unit and the main pipe; and a second pressure transmission unit connected to the fluid inlet. The second pressure transmission unit regulates the internal pressure of the second storage unit to control the pressure difference between the second storage unit and the main pipe separated by the liquid junction unit.

A water quality measurement device (100) includes a flow channel (130), an ion sensor having a responsive film portion whose surface is disposed in the flow channel (130), a glass-electrode-type sensor having a glass electrode whose surface is disposed in the flow channel (130), a drive section (115), a first opening-closing section, and a second opening-closing section. When a storage condition is satisfied, the water quality measurement device (100) puts the first opening-closing section in a first closed state and puts the second opening-closing section in a second closed state, thereby producing a state in which the surface of the responsive film portion and the surface of the glass electrode are present in a common closed space (135) whereby the closed space (135) is put in a wet state without the surface of the responsive film portion being immersed in the liquid.

A water quality measurement device (100) includes a flow channel (130), an ion sensor having a responsive film portion whose surface is disposed in the flow channel (130), a glass-electrode-type sensor having a glass electrode whose surface is disposed in the flow channel (130), a drive section (115), a first opening-closing section, and a second opening-closing section. When a storage condition is satisfied, the water quality measurement device (100) puts the first opening-closing section in a first closed state and puts the second opening-closing section in a second closed state, thereby producing a state in which the surface of the responsive film portion and the surface of the glass electrode are present in a common closed space (135) whereby the closed space (135) is put in a wet state without the surface of the responsive film portion being immersed in the liquid.

The present disclosure relates to a sensor element for a potentiometric sensor, including a substrate and an ion-selective enamel layer arranged on the substrate. The substrate has at least one region which is electroconductively connected to the ion-selective enamel layer. The region of the substrate, which is electroconductively connected to the sensor layer, is made of a copper-based alloy having a mass fraction of at least 60% of copper.

The present disclosure relates to a potentiometric probe for measuring a measured variable that represents an ion concentration in a measuring medium, including a probe base including a sensor circuit, and two electrochemical half-cells arranged such that one of the half-cells surrounds at least one portion of the other half-cell, wherein at least one of the half-cells is configured as a module which is connected to the probe base via a mechanical and electrical interface. In another embodiment, one of the half-cells is a measuring half-cell including an ion-selective membrane and a terminal lead which electrically contacts the ion-selective membrane. The other half-cell is a reference half-cell, wherein the measuring half-cell and/or the reference half-cell are each configured as a module which is connected to the probe base via a mechanical and electrical interface.