Methods and sensors for the detection, identification, and quantification of one or more gas species, including volatile organic compounds, in a test sample are described. Methods employ gas sensors comprising a diffusion matrix present on the sensor surface. A gas analyte in a test sample diffuses through the matrix and is detected upon interaction of the analyte with the sensor. A response profile of a gas sensor to a gas analyte in the test sample is compared to a control gas sensor response profile determined in a similar manner for a known gas species. Comparisons of test sample and control sample sensor response profiles enable detection, identification, and quantification of a gas species analyte in a test sample.

A system for calibrating a moisture sensor encompasses a processing unit (341). The processing unit (341) includes a reference data obtaining LCKT (345), a subject data obtaining LCKT (346) and a relationship calculating LCKT (347). The reference data obtaining LCKT (345) obtains reference data, after injecting water-vapor with known concentrations into an analyzer. The subject data obtaining LCKT (346) measures subject data indicating temporal variation of output-responses of a subject sensor element of the analyzer under test. The relationship calculating LCKT (347) compares the subject data with the reference data, and calculates relationships between the output-responses of the subject sensor element and the known concentrations.

The monitoring breathalyzer has an alcohol sensor, a processing unit or processor, and a screen. The processing unit determines the accuracy of the breathalyzer using the user's body as a simulator. In monitoring mode, the processing unit receives a BAC measurement from the alcohol sensor based on the breath sample provided by the user at a sample time and determines a reference point from the BAC measurement. The sample time is determined based on a time to a predetermined calibration point from a drink start time.

Method for calibrating a gas chromatograph to render the calibration of the gas chromatograph more error-proof, wherein relative response factors determined during the calibration are compared with universal relative response factors contained in the memory and typical of the detectors, where an error message is generated and output if the relative response factors determined in the calibration deviate beyond a predetermined degree from the universal relative response factors, and where the universal relative response factors are determined and provided for different components by the manufacturer of the detectors, for instance.

Embodiments relate generally to systems and methods for providing a secure attachment between a gas detector and an external device. A gas detector may comprise a socket comprising a cable attachment configured to interface with an external device; and a holder configured to attach to the socket and to the external device, the holder comprising a first interface configured to attach to the socket of the gas detector; a second interface configured to attach to the external device; a first cable attachment located within the first interface, configured to attach to the gas detector; and a second cable attachment located within the second interface, configured to attach to the external device.

Embodiments relate generally to methods and systems for communicating, storing, and accessing a calibration and test certificate for a gas detector. A calibration and test certificate may verify that the gas detector has been tested and/or calibrated and can be operated in compliance with specific regulations. Embodiments of the disclosure include integrating the calibration certificate into the individual device, where it may be readily viewed by the user, a supervisor, or inspector to verify the compliance of the device. The certificate may be required to be verified when a user takes the gas detector to a worksite before work can begin. Therefore, storing the certificate on the device may simplify the process of accessing the certificate for the user and supervisor.

An easy-to-maintain measurement system including a first sensor that measures a target and outputs a predetermined physical quantity, a second sensor that measures the target and outputs the same type as the predetermined physical quantity, and a processor configured to (1) acquire a first value from the first sensor and a second value from the second sensor, (2) convert the first value to the value of the physical quantity by a first calibration data, (3) calculate second calibration data for the second sensor from the second value and the predetermined physical quantity obtained in step (2), (4) convert the second value to the physical quantity by the second calibration data, and (5) detect the state of the measurement target by an estimation model and the physical quantity obtained in step (4).

The monitoring breathalyzer has an alcohol sensor, a processing unit or processor, and a screen. The processing unit determines the accuracy of the breathalyzer using the user's body as a simulator. In monitoring mode, the processing unit receives a BAC measurement from the alcohol sensor based on the breath sample provided by the user at a sample time and determines a reference point from the BAC measurement. The sample time is determined based on a time to a predetermined calibration point from a drink start time.

Systems and methods for compensating long term sensitivity drift of catalytic type electrochemical gas sensors used in systems for delivering therapeutic nitric oxide (NO) gas to a patient by compensating for drift that may be specific to the sensors. In at least some instances, the long term sensitivity drift of catalytic type electrochemical gas sensors can be addressed using calibration schedules, which can factor in the absolute change in set dose of NO being delivered to the patient that can drive one or more baseline calibrations. The calibration schedules can reduce the amount of times the sensor goes offline. Systems and methods may factor in actions occurring at the delivery system and/or aspects of the surrounding environment, prior to performing a baseline calibration, and may postpone the calibration and/or rejected using the sensor's output for the calibration.

Systems and methods for compensating long term sensitivity drift of catalytic type electrochemical gas sensors used in systems for delivering therapeutic nitric oxide (NO) gas to a patient by compensating for drift that may be specific to the sensors. In at least some instances, the long term sensitivity drift of catalytic type electrochemical gas sensors can be addressed using calibration schedules, which can factor in the absolute change in set dose of NO being delivered to the patient that can drive one or more baseline calibrations. The calibration schedules can reduce the amount of times the sensor goes offline. Systems and methods may factor in actions occurring at the delivery system and/or aspects of the surrounding environment, prior to performing a baseline calibration, and may postpone the calibration and/or rejected using the sensor's output for the calibration.