A gas sensor includes a sensor element having electrode pads, metal terminal members connected to the respective electrode pads, separators, and lead wires connected to the rear ends of the metal terminal members. Each metal terminal member has a forward locking portion and a rear locking portion provided at the forward and rear ends, respectively. The separator is composed of a forward separator and a rear separator connected to each other. The forward separator includes a first locking portion having a rearward-facing surface, and the rear separator includes a second locking portion having a forward-facing surface. The metal terminal member is held between the forward separator and the rear separator in a state in which the forward locking portion is in locking engagement with the rearward-facing surface and the rear locking portion is in locking engagement with the forward-facing surface.

There is provided a method of manufacturing a gas sensor that includes: forming an insulating layer on a main surface of a substrate; forming a porous oxide layer on the insulating layer; and forming a porous metal layer on the porous oxide layer, wherein the forming the porous metal layer is performed by depositing a constituent material of the porous metal layer in an inclined direction with respect to a normal line of a main surface.

A method of sensing a target gas in an environment in which a response of a semiconducting gas sensor device upon exposure to the environment is measured. The semiconducting gas sensor device includes first and second electrodes in electrical contact with a doped organic semiconductor layer and is, e.g., an organic thin film transistor or organic chemiresistor. The measured response may be indicative of a cumulative amount of a target gas that the semiconducting gas sensor device has been exposed to. A gas sensor module containing the semiconducting gas sensor device may be connectable to a reader configured to read the semiconducting gas sensor device after exposure to the environment. The connection may be wired or wireless. The target gas may be 1-methylcyclopropene.

A real-time measuring device of oxygen concentration in a droplet environment, comprising: a measurement pipeline, a gas-liquid separation structure installed inside a side of the gas inlet of the measurement pipeline, a pressure sensor, a zirconia oxygen concentration sensor with a builtin thermal resistor, a digital signal converter, a signal amplifier and a signal processing unit sequentially installed at the gas outlet of the measurement pipeline, wherein the pressure sensor, the thermal resistor and the zirconia oxygen concentration sensor are connected to the digital signal converter and the signal amplifier, respectively, and the signal processing unit obtains the amplified and AD converted zirconia oxygen concentration sensing signal, pressure sensing signal and the temperature sensing signal and calculates real-time oxygen concentration.

Embodiments of the invention are directed to a system for detecting neurotransmitters. A non-limiting example of the system includes a porous electrode. A system can also include a pH sensor attached to the porous electrode, wherein the pH sensor includes a sensing electrode and a reference electrode. The system can also include electronic circuitry in communication with the pH sensor.

A sensor element for detecting a parameter of a gas mixture in a gas chamber, having a first electrode and a first diffusion barrier layer arranged to be coupled to said first electrode in a predetermined first region, and arranged such that the gas mixture of the gas chamber only impinges on the first electrode in the first region via the first diffusion barrier layer. In addition, the sensor element has a second electrode arranged such that the gas mixture of the gas chamber impinges on the second electrode in a further first region. The sensor element includes a solid electrolyte designed to be coupled to the first and the second electrodes.

An insulating separator of a gas sensor is formed to be dividable into a forward separator having a terminal disposition hole, and a rear separator having four terminal disposition holes. The insulating separator has a ventilation path formed between the forward separator and the rear separator. As a result, moisture and the like which enter the insulating separator from a forward side of the forward separator through the terminal disposition hole can be discharged outward of the insulating separator through the ventilation path. As a result, corrosion of metal terminals caused by entry of moisture can be reduced, whereby transmission of a sensor signal and application of current or voltage through the metal terminals can be appropriately implemented.

The present invention relates to a gas sensor electrode including a conductive particle phase made of Pt or Pt alloy and a ceramic particle phase being mixed and dispersed, wherein a rate of content of the ceramic particle phase is 6.0 to 22.0 mass %, and a void ratio is 2.5 to 10.0%, and a dispersion degree of the conductive particle phase per length of 25 μm on the electrode surface is 0.60 to 0.85 μm, and a dispersion degree of the conductive particle phase in the electrode cross section per length of 100 μm in a direction parallel to the electrode surface is 2.0 to 4.0 μm. This electrode can be produced by firing a metal paste made by dispersing, in a solvent, a conductive particle having a core/shell structure in which a core particle such as Pt is covered with a ceramic shell and ceramic powder. The gas sensor electrode according to the present invention has a high electrode activity.

A sulfur oxide detection system includes an element part which includes a sensor cell and a diffusion regulating layer. The sensor cell includes a solid electrolyte layer, a first electrode arranged, and a second electrode. The sulfur oxide detection system also includes a voltage application circuit configured to apply a voltage to the sensor cell so that a potential of the second electrode becomes higher than a potential of the first electrode, and a current detection circuit configured to detect a current flowing between the first electrode and the second electrode. The sulfur oxide detection system further includes a controller coupled with the voltage application circuit and the current detection circuit, and configured to estimate a sulfur oxide concentration in a gas to which the first electrode is exposed by way of the diffusion layer.

For measuring concentrations of fluid-soluble gases with improved drift stability and low production costs, thus dispensing with tedious calibration and/or drift correction routines and re-membraning procedures, a sensor and a system are provided, comprising at least two electrodes, which are covered by sensor fluid at at least one detection site; and an ion-balancing means (50), for example a mixed-bed ion-exchange resin, in contact with the sensor fluid for removing polluting ions.