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Dataloggers Used in Air Quality Monitoring
Our monitoring stations are based around a programmable datalogger (typically a CR800, CR1000 or CR3000) that measures the sensors, then processes, stores, and transmits the data. Our low-power dataloggers have wide operating temperature ranges, programmable execution intervals, onboard instructions, and ample input channels for commonly used sensors. Wind processing algorithms, including the Yamartino method of computing standard deviation of wind direction, are standard in the datalogger instruction sets. Our dataloggers interface directly to most sensors, eliminating external signal conditioning.
Data are typically output in the units of your choice (e.g., wind speed in mph, knots, m/s). Measurement rates and data recording intervals are independently programmable, allowing calculation of 15-minute, hourly, and daily data values from 1-minute or 1-second measurements, for example. Atypical events can trigger alarms and cause additional data to be recorded. The program can be modified at any time to accommodate different sensor configurations or new data processing requirements. Channel capacity can be expanded using multiplexers.
Sensors, Analyzers, and Monitors
Almost any meteorological sensor can be measured by our dataloggers, allowing stations to be customized for each site. Typical sensors used on our stations include, but are not limited to: wind speed, wind direction, solar radiation, delta temperature (SRDT), air temperature, water temperature, soil temperature, relative humidity, precipitation, and barometric pressure. In some locations, hydrological sensors provide additional measurements, such as water quality of a nearby stream.
A wide range of gas analyzers can be used with our systems. Many gas analyzers output a user selectable 1, 5, or 10 Vdc signal proportional to the concentration of the gas being measured. The datalogger measures the voltage directly and then scales the voltage into the appropriate concentrations, in ppm or ppb. Control ports on the datalogger are programmed to open and close solenoids to complete the daily self-calibration. Commerically available gas analyzers measure concentrations of SO2, H2S, O3, NOX, NO, NO2, CO, CO2, CH4, and THC (total hydrocarbon).
The beta-gage type of particle sampler (PM10 or PM2.5) typically has a voltage output that our dataloggers can measure directly. Our dataloggers can also measure most flow sensors and opacity meters. On-board processing instructions use concentration and flow data to compute stack emissions.
Sensors we offer include the 05305 for wind speed and wind direction, the LI200X or CMP3 for solar radiation, and the 43347 for air temperature.
Data Retrieval
We offer multiple communication options for data retrieval which can be mixed within the same network. Telecommunication options include short-haul, telephone (landline, voice-synthesized, cellular), radio frequency, multidrop, and satellite. On-site options include storage module, and laptop computer.
Software
Our PC-based support software simplifies the entire monitoring process, from programming to data retrieval to data display and analysis. Our software automatically manages data retrieval from networks or single stations. Robust error-checking ensures data integrity. We can even help you post your data to the Internet.
Instrumentation Towers
Our UT30 Instrumentation Tower (30 foot) meets PSD requirements.
案例研究
Landfills present many environmental challenges, ranging from odor control to groundwater quality. Continuous, accurate monitoring......阅读更多
In 1996, Southern Peru Copper Corporation (SPCC) installed real-time meteorological monitoring stations at its various......阅读更多
Since its beginning in 1981, the main purpose of the Community Environmental Monitoring Program (CEMP)......阅读更多
The past few years have seen a scramble within the power industry to use more......阅读更多
When Air Resource Specialists, Inc. needed a datalogger to withstand the remote extremes of our......阅读更多
Thirteen Campbell Scientific weather stations collected data in the Grand Canyon area in early 1990......阅读更多
To meet regulations that govern the nuclear industry, Westlakes Research Institute carried out a study......阅读更多
常见问题解答
空气质量与污染: 1
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Most Campbell Scientific systems are built from individual components. This provides maximum flexibility for our customers, but it does not lend itself to pricing a "typical" system. Contact Campbell Scientific for assistance in pricing a system to meet the unique needs of the application.