Automatic UV Analyzers



The UVT-300 leverages the strengths of the many UV analyzers we have developed through the years, while also offering exceptional ease of use and maintenance.


  • Cell washing mechanism with no drive mechanism.
  • High-speed response and fully continuous measurement.
  • An optical system enables high-accuracy measurement with stability over the long term.
  • Direct-reading digital display.
  • Easy to install, virtually anywhere.
  • Reduced maintenance and management.
  • A wide range of options.

Principle of Measurement

Light from a light source lamp passes through the sample cell, and is split into two directions using a half-mirror, and the amount of transmitted UV and visible light is detected by photocells. Part of the light from the lamp directly enters a photo cell on the light source side, and the amount of radiated UV and visible light are detected. By processing these four detection signals, it is possible to measure turbidity-corrected UV absorbance (UV-VIS) with automatic correction for the effects of changes in the turbidity of the sample water, and changes in the emission intensity of the light source lamp.

UVT-300 specifications

Measurement range 0–0.5/0–1.0 absorbance (10 mm square cell conversion, 2 range switching)
Or 0–1.0 / 0–2.0 absorbance (10 mm square cell conversion, 2 range switching)
(VIS is guaranteed only for absorbance of 0–1.0)
Measured quantities Turbidity-corrected UV absorbance (UV-VIS)
UV absorbance (UV)
Visible light absorbance (VIS)
Measured wavelengths UV: 254 nm, Visible light: 546 nm
Measurement cycle 5 –99 min 59 sec
Measurement method 2-light path, 2-wavelength UV absorbance measurement method
Calibration method Span calibration: Manual
Zero calibration: Manual
Conversion function
Washing Automatic washing with stream of washing cleaner (Continuous measurement during washing)
Range setting Manual switching
Type Standalone console
Dimensions 300W×515D×352Hmm
Weight Approx. 25 kg
Standard liquid Potassium hydrogen phthalate aqueous solution
Repeatability Within ±1% of full scale
Zero stability Within ±2% of full scale/day
Span stability Within ±2% of full scale/day
Ambient temperature change Within ±2% of full scale/5°C
Measurement value output AC100V±10V 50/60Hz Approx. 100VA
Error alarm indication LED display, Closed contact output in case of error (AC 125 V, 1 A)
Alarms Maintenance
Power interruption
Lamp burnt out
Sample conditions 0.03–0.2 MPa 2–10 l/min (Must be ice-free)
Power AC100V±10V 50/60Hz Approx. 100VA
Set up conditions 10–40°C during operation (Temperature gradient 10°C /hour or less)
45–95%RH (No condensation)

Specifications are subject to change due to product improvements.


  • Tokyo office: +81-3-3241-8461

    Shiga office: +81-77-544-6224

Technological Field
Technology >> Measurement & analysis > Water Quality Analyzers
Industry Sector
Industry sector >> Home appliances & electronics equipment > Home Appliances & Electronic Equipment Sensors