TETHYS

UV400 ATEX Online Water Analyser

OVERVIEW
Parameter Specification
Accessories
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The UV400 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. Mainly based on UV spectroscopy, well known for its stability and low operating cost, the UV400 ATEX can measure parameters like aromatics hydrocarbons (PAH), hydrogen sulphide, organic matter, ammonia, phosphate and turbidity. Each parameter corresponds to a specific optical module that can be selected by the user while ordering the analyser, depending on the application. 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. A web-based interface allows the control and the troubleshooting at distance though an ATEX Wi-Fi or Ethernet connection using a standard browser on a computer or tablet.

Ex pz protection according to EN94/9/EC

The UV400 ATEX has a IP 65 stainless steel enclosure with an air purge system Ex pz to work on hazardous areas classified "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. A thermostatic vortex cooler can be installed as an option to maintain a moderate temperature inside the enclosure for outside use with high ambient temperature. After certification, a marking plate can fixed on the enclosure with the specified marking, example :

II 3G Ex [pz] IIC T3

II : non-mining	3G : category 3 for Gaz	PZ : pressurised	IIA : propane	T1 : 450°C
	3D : category 3 for Dust		IIB : ethylene	T2 : 300°C
			IIC : Acetylene, hydrogen	T3 : 200°C
				T4 : 135°C
				T5 : 100°C
				T6 : 85°C

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.

UV absorbance spectroscopy

1 : xenon lamps,
2 : flow cell,
3 : beam splitter,
4 : peak filter,
5 : peak detector,
6 : reference filter,
7 : reference detector

UV fluorescence principle

1 : xenon lamps,
2 : excitation filter,
3 : flow cell,
4 : emission filter,
5 : photomultiplier,
6 : reference photo detector

Laser Diode Turbidity Principal (Nephelometric)

1 : Laser diode (650 nm or 850 nm),
2 : flow cell,
3 : Photo detector

Patented Flow cell

1 : Allows very high level of suspended solid without clogging for all the optical measurements making it suitable for industrial & municipal waste water application. More...

Hydrogen Sulphide and Ammonia : a UNIQUE method

1: stripping pot, 2 : temperature probe, 3 : gas flow cell, 4 : gas pump, 5 : xenon flash lamp, 6 : spectrograph

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.

User-Friendly Interface

Note: Click on image to view it large.

The colour touch screen and intuitive interface available in 8 different languages (Chinese, English, French, German, Italian, Portuguese, Spanish, Turkish) makes very easy to test or configure the analyser. Many test functions allows to test and troubleshoot each element of the analysers (light signal, pumps, solenoid valves, etc...) to setup quickly a maintenance diagnostic.

Communication

Additional parameters are available like status code, error code, calibration values and pumps run time. Basic 4-20 mA output modules can be plugged on the main board for each measuring channel, in the limit of 12 modules. A USB port enables to download on any USB key the last 5000 recorded measurements as well as a diagnostic file containing the configuration and useful information for remote troubleshooting. The new web interface makes possible to drive remotely the analyser from any computer, tablet or i-phone with a web browser. For this, an optional Wi-Fi or Ethernet module is added inside the analyser to connect it to an existing network with an internet gateway. The recorded measurements file can be imported to Excel for graphs or other treatments. The software of the analyser can be upgraded by connecting a USB key.

Low Maintenance and High Reliability

The design has been specially oriented for low maintenance and high reliability on the measurements. To avoid deposits on the optical windows and tubing, the UV400 ATEX has a built-in automatic cleaning system that injects a 5% sulphuric solution normally once day. An auto-zero is performed at the same time to avoid any drift of the measurement. The patented flow cell limit the risk of clogging inside the flow cell. The level of the cleaning solution as well as reagents for H2S, NH4 or PO4 can be controlled at distance to plan the refill.

UV400 ATEX Dimensional Drawing

Online water analyzer, UV400 ATEX - Parameter Specification

Parameter	Standard range Other ranges on request	Typical Repeatability For low values (<10% FS)	Accuracy On standard solution
UV254	0-200 Abs/m 0-600 Abs/m 0-2000 Abs/m	+/- 0.05 Abs/m +/- 0.15 Abs/m +/- 0.5 Abs/m	+/- 2%
COD by UV correlation	0-100 mg/l COD 0-2000 mg/l COD 0-20,000 mg/l COD	+/-0.05 mg/l COD +/- 1 mg/l COD +/- 10 mg/l COD	+/- 2%
BOD by UV correlation	0-100 mg/l BOD 0-1000 mg/l BOD 0-10,000 mg/l BOD	+/-0.05 mg/l BOD +/- 0.5 mg/l BOD +/- 5 mg/l BOD	+/- 2%
TOC by UV correlation	0-100 mg/l TOC 0-1000 mg/l TOC 0-10,000 mg/l TOC	+/-0.05 mg/l TOC +/- 0.5 mg/l TOC +/- 5 mg/l TOC	+/- 2%
Nitrate	0-100 mg/l NO3	+/- 0.1 mg/l NO3	+/- 2%
Colour	0-100 Pt/Co 0-1000 Pt/Co	+/- 0.1 Pt/Co +/- 2 Pt/Co	+/- 2%
PAH (aromatics)	0-10 mg/l C6H6	+/- 0.01 mg/l C6H6	+/- 2%
Oil in Water	0-100 ppm OIW 0-1000 ppm OIW	+/- 0.1 ppm OIW +/- 1 ppm OIW	+/- 2%
Phosphate	0-2 mg/l P-PO4 0-20 mg/l P-PO4	+/- 0.01 mg/l P-PO4 +/- 0.1 mg/l P-PO4	+/- 2%
Ammonia	0-100 mg/l NH4	+/- 0.2 mg/l NH4	+/- 5%
Hydrogen Sulphide	0-20 mg/l H2S	+/-1 mg/l H2S	+/- 2%
Turbidity (TSS by correlation)	0-10 NTU 0-100 NTU 0-1000 NTU	+/- 0.01 NTU +/- 0.1 NTU +/- 1 NTU	+/- 2%

Online water analyzer, UV400 ATEX - General Specification

Sample flow	Recommended : 0 - 5 L/MIN 0 – 0.5 l/min for NH4 or H2S
Sample pressure	0 – 4 Bar (0 -1 Bar with sampling peristaltic pump) 0 – 0.5 Bar for NH4 or H2S
Sample temperature	0 °C to 80 °C 0°C to 30°C for NH4 or H2S
Wet parts material	Quartz, Polypropylene, Polyethylene, FPM (Viton), PMMA (+ Pharmed and glass for NH4 or H2S)
Measuring time	5 sec (Except PO4, NH4, H2S : 3mn)
Measurement interval	1 min to 720 min (except PO4, NH4, H2S : 4mn.) Physicochemical parameters may be continuous
Memory	5000 lines of measurements (up to 16 channels) with date and time
Consumption	Cleaning solution (5% sulfuric acid): 220 ml/day Reagent per measurement : 2 ml per measurement / NaOH 10% for NH4: 2 ml per measurement / HCl 10% for H2S: 2 ml per measurement
Maintenance interval	Recommended: 6 months to 1 year (except for refilling)
Power supply	230v AC 50/60 Hz 100 VA (115v on request)
Screen	Colour TFT LCD 320x240 pixels with LED backlight
Communication	RS232, Modbus or HTTP/Web interface, compatible with Windows7, with Internet Explorer version 9, Nexus 7 tablet under Android with Opera version 12.10, Apple I-phone 4S with Safari RS485 for external probes (DO, TSS) USB WI-FI (IEEE802.11B) optional Ethernet (IEEE802.3) optional
Certifications	CE, EN 61010-1, EN 61326e
Enclosure	Stainless Steel IP65
Dimensions	750 x 550 x 350 mm
Weight	40 to 50 kg depending on the configuration

UV400 ATEX Online Water Analyser - ACCESSORIES

Sampling Pump Product Code: P

Sampling peristaltic pump for unpressurized water

Built-in on the left side of the enclosure
Flow of about 0.6 litre/min
Discontinuous operating to increase tube lifetime

Vortex Cooler Product Code: V

Vortex cooler for high ambient temperatures

Operating air pressure: 6 -7 Bars
Cold air flow: about 660 l/min
Warning: the air temperature and flow must be controlled to limit the outlet air temperature