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Chlorine Dioxide
UV254 Organics Monitor


Chemtrac, Inc./ Products/ Organics Monitoring/ UV254 Organics Monitor

UV1-W780
HA600 Screen Graph
HydroAct

UV254 ORGANICS MONITOR

UV1 with HydroACT Series

The UV1 Organics Sensor, when combined with a HydroACT analyzer, provides online continuous organics monitoring utilizing a 254 nm ultraviolet light source. The amount of light absorbed provides an ongoing indication of natural organic matter (NOM) in a flowing sample, and serves as a continuous surrogate measurement for total organic carbon (TOC). The patent pending Ortho-Beam technology provides many significant advantages while maintaining affordability. The sensor’s unique ability to automatically detect and compensate for UV lamp fluctuations and quartz fouling, minimizes losses in accuracy over time, and significantly reduces maintenance.

The UV1 Organics Sensor, when combined with a HydroACT analyzer, provides online continuous organics monitoring utilizing a 254 nm ultraviolet light source. The amount of light absorbed provides an ongoing indication of natural organic matter (NOM) in a flowing sample, and serves as a continuous surrogate measurement for total organic carbon (TOC). More specifically, UV254 is the best detector of aromatic or reactive organics, which when combined with chlorine, can form disinfection byproducts (DBPs). The patent pending Ortho-Beam technology provides many significant advantages while maintaining affordability. The sensor’s unique ability to automatically detect and compensate for UV lamp fluctuations and quartz fouling, minimizes losses in accuracy over time, and significantly reduces maintenance.

Standard Features

  • 254nm wavelength UV light source
  • Online continuous operation
  • Patent pending Ortho-Beam technology
  • Measures UV Transmittance and
  • UV Absorbance values

Optional Features

  • Combine with other HydroACT sensors like SCM, NTU, Chlorine, etc.
  • Automatic chemical cleaning system
  • Dual sample feed capability

Benefits

  • Surrogate measurement for TOC/DOC
  • Reduced need for cleaning
  • Continuous compensation for lamp drift and cuvette fouling
  • No reagents
  • Much lower purchase price than other online organics monitors
  • Very low maintenance costs
Range 0 – 100% UVT, 0 – 2 UVA
Accuracy ± 0.5% FS
Repeatability ± 0.1% UVT
Resolution 0.1% UVT, 0.001 UVA
Units cm-1
Path Length 1 cm
Sampling Time 10 seconds
Flow Rate 300 – 1000 mL/min.
Calibration Ortho-Beam technology allows continuous automatic calibration during operation
Self Diagnostics Continuous detection of leaks, lamp output, humidity, temperature, and electrical fault
Wavelength 253.7 nm
Light Source Low pressure mercury UV lamp
Lamp Life 2 year expected
Dimensions 14″ H x 12″ W x 8″ D
Enclosure Nema 4X, wall mountable
Fluid Connections 1/4″ tube compression in/out
Electrical 24VDC 20W power adapter
(accepts 90-250 VAC 50/60 Hz)
Storage Temp -4º to 140º F (-20º to 60º C)
Operating Temp 32º to 113º F (0º to 45º C)
Warranty 2 year limited warranty
Options Dual Feed
Automatic chemical cleaning
Open channel / Non-pressurized pump system
UV1 / Operation Manuals Version Languages Size Date
HydroACT 4 UV254 User Manual

HydroACT 4 UV254 User Manual

6.3 MiB 11/15/2017
UV1 / Datasheets Version Languages Size Date
UV1 Data Sheet

UV1 Data Sheet

684.5 KiB 01/23/2017
UV254, also known as the Spectral Absorption Coefficient (SAC), is a water quality test parameter which utilizes light at the UV 254nm wavelength to be able to detect organic matter in water and wastewater. This is due to the fact that most organic compounds absorb light at the UV 254nm wavelength. Unlike other organic test parameters, UV254 has a bias towards reactive or aromatic organic matter which has double bonded ring structures and is typically the most problematic form of organics in water. UV254 is typically represented as a calculation of UV absorbance (UVA) or UV transmittance (UVT).
UVT is a relative measurement. It is essentially a measure of how much light passes through a water sample compared with how much light passes through a pure water sample. The sample water measurement is actually divided by the pure water measurement and then converted to a percentage. Therefore, any unit of measure of the light itself is cancelled in the division. An example of a UVT measurement would be 96.4% UVT. Pure water (DI water) will read 100% UVT, and completely opaque water will read 0% UVT. Typically UVT is only used to refer to the transmittance of light at the 254nm wavelength since its application is usually for UV disinfection system dosing. UVT will be different for different path lengths. Because the UVT varies with path length and the concentration of matter, the UVT is usually expressed with the assumption that a 1 cm path length is used so that the UVT provides a measure of matter in the water independent of path length.

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