Online Organics Monitor

UV1 with HydroACT Series

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Online continuous monitoring

Low maintenance
costs

NO REAGENTS REQUIRED

ORTHO BEAM TECHNOLOGY

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 reduces maintenance.

  • 254nm wavelength UV light source
  • Online continuous operation
  • Patent pending Ortho-Beam technology
  • Measures UV Transmittance and
  • UV Absorbance values
  • Combine with other HydroACT sensors like SCM, NTU, Chlorine, etc.
  • Automatic chemical cleaning system
  • Dual sample feed capability
  • 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

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Overview

Q & A

Specifications

Downloads

Overview

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.

Videos

Q & A’s

The Chemtrac UV1 UV254 Organics Monitor is designed for continuous online monitoring of organic matter in water using a 254 nm ultraviolet light source. It provides a surrogate measurement for total organic carbon (TOC) by detecting natural organic matter (NOM) in water samples

The UV254 measurement involves passing UV light at a wavelength of 254 nm through a water sample. Organic compounds in the sample absorb some of this light, and the amount absorbed is measured to determine the presence of organic matter.

Key applications include monitoring organics removal in water treatment, detecting changes in coagulant demand, optimizing UV disinfection systems, and monitoring potential for disinfection by-products (DBPs) formation.

UV Transmittance (UVT) is the percentage of UV light that passes through the water sample, while UV Absorbance (UVA) measures the amount of UV light absorbed by the sample. Both parameters are used to assess water quality.

The UV1 monitor uses Ortho-Beam technology, which automatically detects and compensates for UV lamp fluctuations and quartz fouling, ensuring consistent accuracy over time.

The UV1 monitor requires minimal maintenance due to its Ortho-Beam technology, which reduces the need for frequent cleaning. An automatic cleaning system is also available as an optional feature.

The monitor provides a 4-20 mA analog output, which can be configured for either UVT or UVA measurements. It also includes RS232 for data logging and dry-contact terminals for alarm conditions.

The UV1 monitor uses a low-pressure mercury UV lamp with an expected life of about 2 years.

Specifications

Features

Description

  • 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

HydroACT Features

HA2

HA4

HA8

  • Sensor limit*

    2

    4

    8

  • Analog output limit*

    2

    4

    8

  • Relay limit*

    4

    8

    16

  • Digital Input limit*

    4

    8

    16

  • Isolated universal I/O

    •

    •

    •

  • Nema 4X/IP65

    •

    •

    •

  • Wall & panel mount

    •

    •

    •

  • Multilingual

    •

    •

    •

  • High resolution display

    •

    •

    •

  • Graphical trending

    •

    •

    •

  • On/Off threshold control

    optional

    optional

    optional

  • Advanced control (e.g. PID)

    optional

    optional

    optional

  • Color display

    •

    •

  • Customizable data logs

    •

    •

  • MicroSD card download

    •

    •

  • Remote (Internet) access

    optional

    optional

  • PROFIBUS, Modbus

    optional

    optional

*Sensors, I/O, and relays are all optional and must be specified at time of ordering.

Downloads

Title Category Upload Date File Size Download
PDF HydroACT 4 UV254 Operations Manual
HydroACT Multiparameter Analyzer, Organics Monitor (UV254), UV1 Nov 3, 2025 6 MB Download
PDF

HydroACT 4 UV254 Operations Manual

6 MB
HydroACT Multiparameter Analyzer, Organics Monitor (UV254), UV1
November 3, 2025
Download