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Tethys Instruments SAS - HORIBA Advanced Techno
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Tethys - Model UV500 ATEX -Online Water Analyser

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The UV500 ATEX, based on a modular concept, allows to monitor one or several parameters for process water, cooling water or waste water. The special enclosure and air purge system allows to use it on hazardous areas classified "Ex" like refineries and chemical plants. Based on UV spectroscopy, well known for its stability and low operating cost, the UV500 ATEX can measure parameters like aromatics hydrocarbons (PAH), hydrogen sulphide, organic matter, ammonia. Each parameter corresponds to a specific optical module or software that can be selected by the user while ordering the analyser, depending on the application.A colorimetric module allows the measurement of phosphate or chromium VI.Probes can be added for physicochemical parameters like pH, ORP, dissolved oxygen and conductivity.

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Thanks to its automatic cleaning system and its extremely long life time lamp, the maintenance is roughly limited to the periodic refill of the inexpensive cleaning solution and eventually reagents depending on the parameters.

Ex pz protection according to EN94/9/EC

The UV500 ATEX has a IP 65 stainless steel enclosure with an air purge system Ex pz to work on hazardous areas classified "zone 1 or Zone 2" where a risk of explosive atmosphere is present like refineries or chemical plants. Two alarm contacts are provided if the pressure inside the enclosure drops below the adjustable setting points. This alarm can be used to switch off the power of the enclosure. The analyser is designed to work up to 60°C of ambient temperature to avoid the use of vortex cooler. Depending on the certification needed a marking plate can be fixed on the enclosure with the marking below as an example :
Main Method : UV-visible Spectroscopy
  • All the measurements (PAH, H2S, UV254, NH4, PO4, Colour) are based on UV-VIS spectroscopy that brings fast and stable measurements with a simple hydraulic circuit for a high reliability.
  • All the measurements are done within 5 seconds except H2S, NH4 and PO4 that require about 3 minutes.
  • The UV source is a xenon flash lamp specified for 10^9 flashes that corresponds to more than 10 years of life time with one measurement every minute.
  • Three external turbidity probes (high, medium and low range) are also available if the measurement need to be done in situ, for example before filtering.
Hydrogen Sulphide and Ammonia : a UNIQUE method

The hydrogen sulphide and ammonia measurement are based on the UV absorption of the hydrogen sulphide gas or ammonia gas after a stripping phase. Consequently, the turbidity or colour of the sample has absolutely no influence and measurements can even be carried on activated sludge.

The ammonia gas has a typical periodic absorption spectrum that is analysed using a fast Fourier transform (FFT) that brings an exceptional selectivity. No interference has never been reported after years of operation on many different applications. A small quantity of hydrochloric acid is added to the sample for hydrogen sulphide, or NaOH solution for ammonia.