A test device for testing an oxidation potential of an electrolyte is provided. The test device comprises a cavity, a test unit, a detector, a processing unit, and a display. The test unit comprises a positive plate comprising a first through hole, a negative plate comprising a second through hole, a first infrared window covering the first through hole, a second infrared window covering the second through hole, and an electrolyte located between the positive electrode plate and the negative electrode plate. The first through hole and the second through hole penetrate each other. The first infrared window, the positive plate, the negative plate, and the second infrared window are stacked with each other. An infrared light beam passes through the first infrared window, the first through hole, the electrolyte, the second through hole, and the second infrared window in sequence and then is detected by the detector.

Provided is a method for detecting a test substance. In this method, metal is deposited or a complex containing a test substance and a metal particle is immobilized on a working electrode on an electrode substrate including the working electrode and a counter electrode. An oxidation potential is applied to the working electrode to generate metal ions, then a reduction potential is applied to a portion having an area smaller than an area of the portion to which an oxidation potential is applied in the working electrode to deposit metal on the surface of the portion to which the reduction potential is applied, and current, voltage or charge caused by the metal deposited is measured to detect metal ions or a test substance.

The present disclosure relates to an amperometric sensor for measuring free chlorine, which sensor comprises:

an elongate body with a tip, wherein the circumferential surface of the body constitutes a counter electrode;

a reference electrode having a silver/silverchloride electrode surface arranged on the tip of the elongate body; and

a working electrode having a gold electrode surface arranged on the tip of the elongate body wherein the gold electrode surface is composed out of a string of electrically connected, spaced apart surface parts.

This disclosure relates to improved devices, systems and methods for detecting and measuring oxidizing compounds in test fluids. Certain embodiments include a measurement device configured to apply a constant current to the test fluid and measure a reference voltage indicating an electrochemical potential at which electrolysis occurs in the test fluid. The measurement device is further configured to measure a second voltage indicating an oxidizing potential of the test fluid, and to calculate an oxidizer concentration measurement indicating the concentration of the oxidizing compound in the test fluid based on a voltage difference between the reference voltage and the second voltage.

A monitor and indicator system includes a sensor part, a control and indication part, and a power part. The monitor and indicator system is configured to: (a) monitor a concentration of a sterilant in a sanitizing solution; (b) determine a depletion of the sterilant upon detecting that the concentration of the sterilant becomes equal to or falls below a predetermined threshold concentration level; and (c) indicate the depletion of the sterilant of the sanitizing solution by emitting a notification.

A system and method for measuring concentration of oxidation ions in a solution includes a conduit that contains the solution at least temporarily, a pH sensor associated with the conduit and configured to provide a pH signal indicative of a pH of the solution, an oxidation reduction probe (ORP) associated with the conduit and configured to provide an ORP signal indicative of an oxidation reduction of the solution, and a controller configured to receive and process the pH signal and the ORP signal, wherein the controller calculates a concentration of oxidation ions in the solution based on the pH and ORP signals.

A residual chlorine meter for measuring the concentration of residual chlorine in sample water includes an indicator electrode and a counter electrode to be immersed in the sample water and a controller that measures the concentration of residual chlorine in the sample water based on a diffusion current flowing between the indicator electrode and the counter electrode in a case in which a voltage is applied between the indicator electrode and the counter electrode. The controller detects a degree of deterioration of a replaceable component of the residual chlorine meter based on a motor current, flowing through a motor that rotates the indicator electrode in the sample water, and/or the diffusion current.

Aspects of the present disclosure are directed to a system for determining in-situ oxidation-reduction potential in a formation having a surface separating the formation from an ambient atmosphere. The system may measure the oxidation-reduction potential in-situ, and thereby provide the most precise measurement of the oxidation-reduction potential. The formation surface may be the interface between the ambient atmosphere and the uppermost layer of the formation. The system may comprise a probe for a penetration into the formation. a reference electrode for placing on the formation surface, and a controller configured to communicate with the probe. The controller may be configured to communicate with the reference electrode, determine the oxidation-reduction potential as a potential difference between the reference electrode and the oxidation-reduction electrode, and communicate with the probe, the oxidation-reduction electrode, the reference electrode or any other device by a wire or wireless or a combination of wire and wireless.

Various apparatus, systems, and methods for measuring a solution characteristic of a sample comprising microorganisms are disclosed. In one embodiment, a sensor apparatus is disclosed comprising a sample container comprising a sample chamber configured to receive the sample and a reference sensor component comprising a reference conduit having a reference conduit cavity defined therein. The reference conduit cavity can be at least partially filled with a reference buffer gel, buffer solution, or wicking component. A segment of the reference conduit can extend into the sample chamber. A reference electrode material can be positioned at a proximal end of the wicking component or extend partially into the reference conduit cavity. The sensor apparatus can also comprise an active sensor component having an active electrode in fluid contact with the sample. The sample in the sample chamber can be aerated through an aeration port defined along a surface of the sample container.

A measuring arrangement includes a sensor fastened to a measuring volume by a mounting adapter and a coupling ring. The sensor penetrates a wall of the measuring volume. The mounting adapter is fixedly arranged in the wall. The sensor is movably arranged in the mounting adapter. The coupling ring is connected to the sensor. The sensor is held in the mounting adapter by the connection of the coupling ring to the mounting adapter. A recess is provided for guiding a peg element. The position of the peg element in the recess is adjustable in, or counter to, the insertion direction of the sensor by a rotary and/or insertion movement of the coupling ring. The sensor and coupling ring can be moved together by pressurization so that the peg element is arranged in a first locking position when pressurization by the medium is present in the measuring volume.