Insertion Probe UV- Photometer Model UVS-1


The dual-channel process UV- photometer model UVI-II measures the UV absorption of liquids in the process.

Configurable for the measurement of:

UV254 / UV280, SAK, TOC, COD, PAH, toluene, benzene, …..

Measuring principle:

The inline photometer model UVI-II uses the principle of dual-channel light absorption to detect the color of liquids. Two LED lamps with different wavelengths of emission are installed in the optics of the sensor.

Measuring channel: Detects the absorption caused by turbidity and UV absorbing substances.
Reference channel: Detects turbidity only.
The difference between the signals ([UV absorption + turbidity] – turbidity) results in the adjusted UV value.

Stabsonde UV- Fotometer Modell UVS-1
Insertion Probe Process UV- Photometer Model UVS-1
Messverstärker Messenger


Dual wavelength absorbance measurement method:
– Simultaneous measurement of absorbance at two different wavelengths.
– Enables precise measurements and compensates for influences of turbidity, window fouling , lamp ageing, …

Calibration / maintenance interval typically 12 months (depending by application):
– Less maintenance and longer service life.
– Service life of LED light sources, typically 5 years.
Probe material typically stainless steel 316L / 1.4404:
– The probe is made of stainless steel.
– Other materials such as titanium or Hastelloy are optionally available.
Measuring window material: Sapphire:
– Sapphire is used as the window material.
– Other materials such as borosilicate or Plexiglas are optionally available.
Sealing material FKM: 
– The seals are made of FKM.
– Seals made of other materials such as FFKM, EPDM or silicone are optionally available.
Process Connection:
– Installation through ball valve in process line.
– Tuchenhagen Variline measuring cell, probe with Varivent plate.
– DIN or Ansi flange on the probe shaft.
Measuring Range 0 – 0.1 AU up to 0 – 5 AU:
– The measuring range extends from 0 to 0.1 absorption units up to 0 – 5 absorption units.