A sensor system comprising a housing having an inlet aperture through which fluid enters the housing and a conditioning material in the housing, the conditioning material being adapted to control levels of a substance within the housing. The sensor system comprises a sensor for analysing the fluid in the housing. The sensor system comprises circulation means which is configured to alternate circulation of fluid within the housing between a sensing fluid path in which the fluid is analysed by the sensor and a second fluid path in which the fluid flow is conditioned. A method for analysing fluid in a housing using a sensor is also provided.

Embodiments of the present specification provide methods and systems for maintaining accuracy and precision of calibration for a detector. The methods and systems include reducing the humidity of an internal calibration assembly by directing flow path of dry air periodically through the internal calibration assembly.

A receiver (10) according to the present disclosure includes: a detection unit (11) including a sensor configured to receive a first optical signal of a wavelength included in an absorption band of water molecules and a second optical signal of a wavelength included in an absorption band of carbon dioxide molecules, a signal processing unit (12) configured to calculate a water vapor concentration and a carbon dioxide concentration from changes of intensities of the first and second optical signals, and a determination unit (13) configured to determine whether or not there is a fire that is caused by alcohol combustion based on the water vapor concentration and the carbon dioxide concentration.

A humidity reduction apparatus and a method for reducing the humidity of a volume of gas. The humidity reduction apparatus comprises a gas delivery conduit, at least one heat-conductive media positioned in-line within at least a portion of the gas delivery conduit, and a cooler in contact with at least a portion of the gas delivery conduit to cool the gas delivery conduit and the at least one heat-conductive media. The gas delivery conduit comprises at least one conducting portion. The first side of the cooler is configured to cool the at least one conducting portion of the gas delivery conduit and the at least one heat-conductive media. The voltage applied across the cooler is selectably reversed such that the first side heats the at least one conducting portion of the gas delivery conduit and the at least one heat-conductive media.

A gas sensor includes: a first thermistor having a resistance value that changes according to a concentration of a first gas with a first sensitivity and changes according to a concentration of a second gas with a second sensitivity; a second thermistor connected in series to the first thermistor, the second thermistor having a resistance value that changes according to a concentration of the first gas with a third sensitivity that is lower than the first sensitivity and changes according to a concentration of the second gas with a fourth sensitivity that is different from the second sensitivity; and a correction resistor connected in parallel with the first or second thermistor.

Methods and systems for detecting and limiting the water in a photoionization detector are provided. The method may include powering off a lamp configured to ionize particles of air. The method may also include monitoring a signal from the photoionization detector. The signal may be monitored based on a current between a signal electrode and a bias electrode. In an instance the signal is above a signal threshold, the method may also include electrolyzing one or more particles of water present in the photoionization detector by closing a leakage switch in order to allow current to flow through the bias electrode and the signal electrode. In an instance the signal is below the signal threshold, the method may include powering on the lamp to begin photoionization detection. Corresponding systems are also provided.

A method of operating a gas detection device including a capillary-limited, electrochemical gas sensor includes operating the gas sensor in a sensing mode during which a signal from the gas sensor is representative of a concentration of the analyte gas measured by the gas sensor and in an interrogation mode during which the gas sensor is electronically interrogated by applying an electric signal to the gas sensor to generate a non-faradaic current flow between a working electrode and a counter electrode without the application of a test gas, periodically entering the interrogation mode, measuring a parameter of a gas sensor output during the interrogation mode, comparing the measured parameter to one or more previously measured parameters, determining an operational state from the comparison, and returning the gas sensor to the sensing mode if the operational state is determined to be within a predetermined range.

A novel gas and fluid measurement system is provided that can assess undesired gas or fluid leakage in surface casing vents at wellbores or facilities under thermal production enhancement. The system can remove water vapour (steam and/or liquid water) from the gas flow, measure flow rates and volumes of fluids and gases, contain representative fluid and gas samples for collection, and monitor and measure, in real-time, the sulphur gas content, physical water parameters and combustible gas content.

Disclosed is a gas sensor for detecting hydrogen gas in a measurement gas atmosphere, including: a first installation part defining a first inner space in communication with the measurement gas atmosphere through a solid electrolyte membrane member; a second installation part defining a second inner space in direct communication with the measurement gas atmosphere; first and second sensor elements respectively installed in the first and second inner spaces; and a calculation unit configured to calculate the concentration of the hydrogen gas according to a potential between the first and second sensor elements. The gas sensor further includes a current detecting portion that detects a current flowing through the first and second sensor elements. The calculation unit is configured to, when the current detected by the current detecting portion is larger than or equal to a threshold value, judge that the hydrogen gas is present at high concentration.

A gas detection device is provided. The device includes a substrate and a dielectric material applied to the substrate. A sensor material is applied to the dielectric film. The sensor material has a bottom, a side, and a top surface. An electrode material is at least partially applied to the dielectric film and at least partially applied to a portion of the side of the sensor material and a portion of the top surface of the sensor material to pin a portion of the sensor material to the dielectric material. The electrode material forms a vapor barrier upon the sensor material to facilitate preventing delamination between the sensor material and the electrode material over portions of the sensor material where the sensor material is not pinned to the dielectric material.