A microbial sensor, microbial sensing system, and method that can be used to determine the chemical environment of unsaturated soils, rhizosphere, and/or plants are disclosed. The microbial sensing system can be used for monitoring the health of plants including nutrients, salinity, contaminants, chemicals (pesticides, herbicides) and diseases. A microbial sensing system can include one or more indicator electrodes and a reference electrode. The microbial sensing system can include a signal acquisition and/or communication module to allow the real-time collection of data from field deployments and laboratory investigations.

A pH sensor with automatic water storage and replenishment, including a substrate, a working electrode, a reference electrode, a first piezoelectric micropump, a water storage device, and a second piezoelectric micropump. The working electrode, the reference electrode, the first piezoelectric micropump, the water storage device, and the second piezoelectric micropump are arranged on the substrate. The working electrode and the reference electrode are each connected to a bonding pad through an electrode lead. The second piezoelectric micropump, the water storage device, and the first piezoelectric micropump are sequentially communicated, and a liquid flows to the working electrode via an outlet of the first piezoelectric micropump.

A gas sensor detects a specific gas concentration in a measurement-object gas and includes an element body and one or more pump cells. The element body includes an oxygen-ion-conductive solid electrolyte layer and is provided with a measurement-object gas flow section therein. The measurement-object gas flow section receives a measurement-object gas and allows the measurement-object gas to flow therethrough. The one or more pump cells each have an inner electrode and an outer pump electrode and pump out oxygen from around the inner electrode to around the outer pump electrode. The inner electrode is disposed in the measurement-object gas flow section and contains a catalytically-active noble metal. At least one pump cell of the one or more pump cells pumps out the oxygen by applying a repeatedly on-off controlled pump current between a measurement electrode and the outer pump electrode.

An electrolyte analyzing device with which an electrical effect does not occur has a housing to which a reference potential is applied and a flow passage which is electrically insulated from the housing. The analyzing device delivers a sample solution to a first electrode, and delivers a reference electrode solution to a second electrode. A reagent vessel placement unit which is electrically connected to the housing, has placed thereon a diluent bottle accommodating a diluent, an internal standard solution bottle accommodating the internal standard solution, and a reference electrode solution bottle accommodating the reference electrode solution. The reagent vessel placement unit includes a suction nozzle comprising an electrical conductor which is joined to the flow passage, and which can be inserted into and removed from each of the diluent, internal standard solution and reference electrode solution bottles. And, an insulator electrically insulates the suction nozzle and the housing.

A method for cleaning, conditioning, calibration, adjustment and conditioning of an amperometric sensor of a measuring device includes generating a conditioning agent in the measuring device, wherein either an oxidising agent which is reduced at the working electrode or a reducing agent which is oxidised at the working electrode is used as conditioning agent.

An electrolyte concentration measurement device includes: an ion-selective electrode supplied with the liquid; a reference electrode serving as a reference for a potential; a potential measuring unit configured to acquire a potential of the ion-selective electrode; a concentration calculation unit configured to calculate a concentration of ions contained in the liquid based on the potential acquired by the potential measuring unit; a potential monitoring unit configured to monitor a potential of the ion-selective electrode and generate a potential response curve; a timing signal acquisition unit configured to acquire a timing signal related to a timing of various operations; and a potential response curve analysis unit configured to detect an abnormality sign of a device based on a relationship between the potential response curve and the timing signal.

A manufacturing method for an electrochemical sensor includes an electrode forming step of forming an electrode, made of a porous material with electroconductivity, on an insulating substrate, and a resist forming step of coating a coating region on the electrode by a resist with non-electroconductivity in a solution state, and permeating communicating pores of the porous material with the resist, thereby adjusting a resistance value of the electrode.

The present technology relates to a potential measuring device capable of acquiring a signal of low-frequency bands of approximately 1 Hz to 300 Hz. The potential measuring device includes: a unit cell that includes a readout electrode for reading a predetermined potential as a displacement with respect to a reference potential, an amplifier circuit that includes a common-source amplifier, the readout electrode being connected to an input node of the common-source amplifier, a predetermined bias voltage being applied to the input node via a resistor, and a buffer circuit that is connected to an output node of the amplifier circuit. The present technology is applicable to, for example, a device for measuring the potential of a solution on a microelectrode.

A fluid analyzer for analyzing fluid samples comprising one or more analytes and a method of calibrating such. The fluid analyzer includes a control system to control at least one automated valve to pass at least three calibration reagents through a fluid channel to a secondary ion selective electrode, a primary ion selective electrode, and a reference electrode, and determine calibration information using calibration logic from signals generated by a meter, control the at least one automated valve to selectively pass different subsets of the at least three calibration reagents through the fluid channel to the secondary ion selective electrode, the primary ion selective electrode, and the reference electrode, and determine re-calibration information using the signals generated by the meter and at least one of the calibration information and re-calibration logic.

A pH sensing probe configured to be exposed to a process fluid is provided. The pH sensing probe includes a sensor body and a pH electrode mounted to the sensor body. A primary reference electrode is mounted to the sensor body and has a primary reference junction that is configured to be exposed to the process fluid. A secondary reference electrode is mounted to the sensor body and has a secondary reference junction configured to be exposed to the process fluid. A seal isolates the secondary reference junction from the process fluid until deterioration of the primary reference junction. A pH sensing system and a method of operating a pH sensing system are also provided.