Abstract: A stationary gas monitoring and testing system includes one or more gas monitoring stations 20, each of which includes at least one gas sensor. The system also includes a supply of testing span gas, a supply of testing zero gas, a gas distribution network connecting each gas sensor to the span gas supply and the zero gas supply through substantially separate conduits, and a controller for enabling the delivery of gas from the supply into the network for delivery to the one or more sensors. A one-way poppet valve at each gas monitor allows the supply conduits to be pressurized in advance. Pre-pressurized separate supply conduits minimize or eliminate the delay in delivering gas to each sensor for testing and calibration.

Abstract: A central alarm (CA) unit in a gas monitoring system including gas sensors and gas sensor controllers operatively connected to respective gas sensors comprises a communications module configured to communicate with the gas sensor controllers, wherein each gas sensor controller is configured to communicate with respective gas sensors, and a gas sensor monitoring module configured to receive from each gas sensor controller a signal including status information of the gas sensors operatively connected to the respective gas sensor controller.

Abstract: A stationary gas monitoring and testing system includes one or more gas monitoring stations 20, each of which includes at least one gas sensor. The system also includes a supply of testing span gas, a supply of testing zero gas, a gas distribution network connecting each gas sensor to the span gas supply and the zero gas supply through substantially separate conduits, and a controller for enabling the delivery of gas from the supply into the network for delivery to the one or more sensors. A one-way poppet valve at each gas monitor allows the supply conduits to be pressurized in advance. Pre-pressurized separate supply conduits minimize or eliminate the delay in delivering gas to each sensor for testing and calibration.

Abstract: A central alarm unit in a gas monitoring system includes a gas sensor controller monitoring module that receives from each gas sensor controller aggregated status information of gas sensors connected to the gas sensor controller and that causes display of gas sensor controller graphical indicators. Each gas sensor controller graphical indicator corresponds to the aggregated status information of gas sensors connected to the respective gas sensor controller. The gas sensor controller monitoring module also receives a command requesting disaggregated status information of the gas sensors connected to the respective gas sensor controller. The unit further includes a gas sensor monitoring module that receives from each gas sensor controller disaggregated status information of the gas sensors connected to the respective gas sensor controller and that causes display of gas sensor graphical indicators. Gas sensor graphical indicators correspond to the disaggregated status information of respective gas sensors.

Abstract: A docking station for use with an environmental monitoring instrument to provide predictive diagnostic information. The docking station is connected, typically via the Internet, to a remote service center, and exposure data, calibration data and diagnostic data are communicated from the instrument to the docking station and from the docking station to the service center. Mathematical analysis of the collected data from all available sources is performed at the service center and predictive warnings are generated to alert the users of potential instrument faults, thus allowing preemptive maintenance. The analysis methods include principle component analysis and other statistical methods, fuzzy logic and neural networks. This docking station can be used with monitoring instruments for water quality, pollution control, indoor air quality and breathing air quality.