|
|
Air Quality
Measurement Instrumentation for Air Quality Monitoring
Campbell Scientific's systems for unattended, long-term monitoring of air quality parameters provide unmatched
reliability and versatility. Our systems measure ambient gas and particulate concentrations, stack emissions,
and visibility. Meteorological parameters can also be monitored for use in determining air stability or for
use in air quality modeling and dispersion modeling. Our equipment is in use at smelters, refineries, tailings,
mines, landfills, construction sites, manufacturing and processing plants, and industrial and hazardous waste
sites. Systems can be customized using a wide selection of dataloggers, sensors, analyzers, and communications devices.
System Benefits
- Meteorological measurements can meet EPA's PSD guidelines.
- Systems are compatible with a variety of third-party gas analyzers, visibility sensors, and particulate monitors.
- Systems are compatible with continuous emission monitoring (CEM) sensors such as flow rate, opacity, temperature, and pressure.
- Systems can monitor efficiency of pollution abatement systems.
- Station portability allows optimal siting and even relocation if necessary.
- An entire network of field stations can be monitored from a single PC via wireless communications.
- Powerful onboard instruction sets provide measurements and auto-calibrations specific to each gas analyzer and site.
- A network of 20 monitoring stations can be polled every 60 seconds allowing real-time decision making to satisfy public health concerns.
- Monitoring systems can incorporate other measurements, such as water quality, slope stability, and leak detection.
Dataloggers used in Air Quality Monitoring
Our monitoring stations are based around a programmable datalogger (typically a
CR10X, 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, & 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-gauge 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 LI-200X 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.
|
|
|
Phone: (780) 454 2505