The Unique Flowcell. The TD-4100 XD does not have a glass flow cell. A proprietary Air Curtain system keeps optical windows fog-free in humid environments or hot water applications. There are no tubes, pumps or valves to replace. The system's one moving part has a life expectancy of greater than 5 years.
Routine maintenance involves changing a lamp twice a year and an air filter periodically.
Direct, Continuous Monitoring. The TD-4100 XD monitors a flowing water stream continuously. No chemicals, no pre-treatment and no manual manipulation of the sample are required to monitor aromatic hydrocarbons. The TD-4100 XD directly measures aromatic hydrocarbons in water with accuracies that consistently correlate to regulated laboratory methods. For example, the TD-4100 XD can detect 5 ppb of gasoline or diesel fuel in water free of interfering compounds.