The measurement principle is based on fluorescence: when lighted at a specific wavelength (excitation), some chemicals re-emit light (emission) at another longer wavelength.

Very few chemicals are fluorescent giving a highly selective measurement.

The emission light is detected by a high sensitivity photomultiplier to detect very low concentrations from a few ppb.

The excitation light is controlled by a detector to compensate any variation of the source.

The application (aromatic hydrocarbons, Chlorophyll a, Rhodamine or fluorescein) needs to be specified when ordering the instruments. It can be changed by the user by changing the optical filters.

A higher sensitivity than falling stream flow cell is obtained due to the absence of parasite light reflections. The flow and pressure of the sample may vary in a wide range at the opposite of falling stream flow cells that need a complex hydraulic system to control the flow.

Once a day, a low-cost cleaning solution (5% sulphuric acid) is automatically injected into the flow cell to clean it. An auto-zero is performed at the same time.

The autonomy is about 2 weeks with the built-in 2-litre tank.

An alarm is generated if the cleaning solution tank is empty.

The operating cost is limited to the refilling of the 2-litre tank of cleaning solution every 2 weeks with 5% sulphuric acid on distilled water (for effluent measurements, you should be able to substitute tap water for distilled water, after checking).

We estimate it to be about US$100 per year including labour.

Hydrocarbons are dangerous pollutants that have to be detected very early on in reservoirs or rivers used for producing drinking water. A fast and reliable measuring system is necessary, and UV fluorescence is the only method that meets these requirements.

Algae is becoming a major environmental concern in more and more lakes and reservoirs due to the excess of nutrients coming from fertilisers or urban wastewater.

Fast and reproducible on-line measurement of Chlorophyll a can be done by fluorescence for environmental studies.

Rhodamine and Fluorescein are the major tracers used for environmental studies (for example, to measure underground water contamination or the transit time of pollutants in a river).

Very low concentrations (below ppb) need to be detected and fluorescence is the only fast and selective method available.

An optional peristaltic pump can be provided to take samples directly from the river or reservoir.

For refineries, the concentration of hydrocarbons in cooling water is a critical parameter.

A fast and reliable on-line measuring system is necessary, and UV fluorescence is the only method that meets these requirements.

Environmental regulations usually require the effluents of refineries and chemical plants to stay below set limits. Only UV fluorescence can provide the reliable and low-maintenance measuring system required.

The CX6000 comes with an automatic cleaning system that maintains the flow cell, avoiding the need for any manual operations to clean a calibrated opening as with open flow cell systems.

Measurement time	< 10 seconds
Sensitivity	high
Use of dangerous solvent (CCL4, freon)	no
Use of flammable gas	no
Air supply	no
Influence of molecular weight	no
Detection of total hydrocarbons	no, aromatics only
Periodic change of lamp or parts	no
Simple hydraulic system	yes
Maintenance	very low
Filtering	no need
Automatic cleaning system	yes
Operating cost	low
Size	compact
Weight	15 kg approx.
Transportable by car or passenger plane	yes
Installation time	few minutes

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