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HACH COMPANY was established in 1947, in Ames, Iowa, USA. For more than 60 years, Hach has been the world market leader for Analytical Instrumentation for Complete Water Analysis, providing solutions for lab, process and field.

In 2002, GLI, a leading US manufacturer of process electro-chemistry analytical instruments, became part of the Hach Company family.

Water analysis has to be right. Our customers deserve complete, reliable solutions that they can be fully  confident in. Hach is your answer. We make water analysis simpler

UV Absorbance/Transmittance Sensor


UV Absorbance/Transmittance Sensor


Applications: Drinking Water, Wastewater, Industrial Water.

Continuous UV 254 Absorbance/Transmittance measurements can be used to protect plant treatment processes from high organic loads. Analysis range of 50mm probe is 0.01-60 m-1. Use for the following applications: protection of treatment plants from industrial dischargers, monitoring shock loads from internal plant processes, control of activated sludge processes, control methanol feed in BNR based on organic loading, final effluent monitoring and monitoring efficiency of UV disinfection processes.

  • Continuous, Automatic Early Warning Systems
  • Control Activated Sludge Processes
  • Self-cleaning Wiper System
  • Monitor Efficiency of UV Disinfection Process
  • Self Diagnostics and Easy Maintenance


Cable Length:10 m fixed cable at sensor
Dimensions (D x L):2.76 in x 13.11 in (70 mm x 333 mm)
Length:13.1 in ( 333 mm )
Maintenance Requirements:1 h/month in standard applications
Measurement Method:UV absorption measurement (patented 2-beam technique)
SAC 254 in accordance with DIN 38404 C3
Measuring Interval:≥ 1 min
Measuring Principle:UV absorption measurement (patented 2-beam technique)
Measuring Principle 2:SAC 254 in accordance with DIN 38404 C3
Operating Temperature Range:2 to 40 °C
Pressure Range:
Range:0.01 to 60 1/m Can be calibrated to other parameters (e.g.TOC, COD, BOD) depending on the application
Reference Wavelength:550
Service Interval:6 months
Weight:7.94 lbs. (3.6 kg)


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