Monte Curcio (MCU) instruments: Picarro G2401 methane, carbon monoxide, carbon dioxide and water analyser. The Model G2401 is based on cavity ring-down spectroscopy (CRDS), capable of measuring the concentrations e compounds. This technique enables measurement of absolute optical extinction by samples that scatter and absorb light. A laser is used to illuminate a high-finesse optical cavity, which consists of two highly reflective mirrors. When the laser is in resonance with a cavity mode, intensity builds up in the cavity due to constructive interference. The laser is then turned off in order to allow the measurement of the exponentially decaying light intensity leaking from the cavity. During this decay, light is reflected back and forth thousands of times between the mirrors giving an effective path length for the extinction on the order of a few kilometres.

Monte Curcio (MCU) instruments: API Teledyne 400E ozone analyser. The Model 400E is an analyser that determines the concentration of ozone (O3) based on the Beer-Lambert law for measuring low ranges of ozone in ambient air. A 254 nm UV light signal is passed through the sample cell where it is absorbed in proportion to the amount of ozone present.

Monte Curcio (MCU) instruments: API Teledyne 701 zero air generator. The Model 701 is a source of clean, dry air for dilution calibrators. It also may be used as a source of purge air for permeation tube ovens or burner air for FID analysers. The regenerative, heatless dryer removes water and produces gas with a dewpoint of less than -20°C (up to 15 SLPM flow rate) independent of the inlet dewpoint and assists in the removal of other gases, greatly increasing the life of the chemical scrubbers. The basic M701 includes an oil and diaphragm free pump plus scrubbers to remove SO2, NO, NO2, O3 and H2S. Optional high performance scrubbers are available to remove CO and Hydrocarbons. Inlet air is pulled into the pump and routed through a pre-cooler and water trap to remove moisture.

Monte Curcio (MCU) instruments: API Teledyne 200AU nitrogen oxide analyser. The Model 200AU uses chemiluminescence detection, coupled with microprocessor technology to provide ambient nitric oxide (NO), nitrogen dioxide (NO2) and the total nitrogen oxides (NOx). It calculates the amount of NO by measuring the amount of chemiluminescence given off when the sample gas is exposed to ozone (O3). A catalytic-reactive converter converts any NO2 in the sample gas to NO, which is then measured as above (including the original NO in the sample gas) and reported as NOx. NO2 is calculated as the difference between NOX and NO.

Monte Curcio (MCU) instruments: API Teledyne 700 mass flow calibrator. The Model M700 can generate diluted calibration gas including ozone, gas phase titration (NO2) from gas cylinders, or from a permeation tube source gas. Each concentration is generated precisely by mixing the gas with diluent zero air in which the mixing ratio is controlled by the mass flow controller. The diluent air mass flow controller has a range of 10 SLPM (20 SLPM option), and the gas mass flow controller has a range of 100 cc/min. (0-50 cc/min., 0-200cc/min. options). The mass flow controllers assure a precise mixing ratio for accurate and precise calibration gas generation using the state-of- the-art electronic closed-loop control.

Monte Curcio (MCU) instruments: API Teledyne 360E carbon monoxide analyser. The Model 360E uses a method based on the Beer-Lambert law, an empirical relationship that relates the absorption of light to the properties of the material through which the light is travelling over a defined distance. In this case the light is infrared radiation (IR) travelling through a sample chamber filled with gas bearing a varying concentration of CO2.