TETHYS

UV400 Online Water Analyser

OVERVIEW
Parameter Specification
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The UV400, based on a modular concept, allows to monitor simultaneously many different parameters for waste water or drinking water treatment plants as well as river monitoring stations. Each parameter corresponds to a specific optical module that can be selected by the user while ordering the analyser, depending on the application. Mainly based on UV spectroscopy, well known for its stability and low operating cost, the UV400 can measure parameters like organic matter, ammonia, nitrate, aromatics hydrocarbons (PAH), colour, hydrogen sulphide and chlorophyll A. Complementary modules allows the measurement of phosphate by colorimetric method and turbidity by a visible or infra-red laser diode.External probes can be added for physicochemical parameters like pH, ORP, dissolved oxygen, conductivity and turbidity.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.

UV-visible Spectroscopy

Most of the measurements (UV254, NH4, H2S, NO3, Colour, PO4, PAH, Chlorophyll A) are based on the 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 PO4, NH4 and H2S that require about 3 minutes.
The patented flow cell allows very high level of suspended solid without clogging. The turbidity of the sample is automatically compensated by a dual-wavelength method as shown on the figure.
The UV source is a xenon flash lamp specified for 109 flashes that corresponds to more than 10 years of life time with one measurement every minute.
Physico-chemical measurements (pH, ORP, Dissolved oxygen, Conductivity) can be added to the internal measurements by using external probes. The dissolved oxygen probe is based on fluorescence method for a lower maintenance and higher stability.
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...

Ammonia and Hydrogen Sulphide: a UNIQUE method

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

The ammonia and hydrogen sulphide measurement are based on the UV absorption of the ammonia gas or hydrogen sulphide 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 ever been reported after years of operation on many different applications. A small quantity of NaOH solution is added to the sample for ammonia, or hydrochloric acid for hydrogen sulphide.

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

The RS232 port supports the MODBUS protocol to transmit each Standard channel value to a SCADA system. 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 Standard 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 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. 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 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.

Multiplexing system

When different streams need to be analysed, for example inlet and outlet of a plant, an optional multiplexing system delivers relay contacts to control external electric-valves or external pumps.

Up to 6 different streams can be selected

The measuring channels can be either duplicated (each one having its own 4-20mA output or MODBUS register), or measured sequentially to fit with the maximum of 16 measuring channels (a MODBUS register tells which stream is currently being measured).

Robust Industrial Probes

All the probes are specially designed for harsh environments with high level of suspended solid.

ORP/pH Probe

Dissolved Oxygen Probe

pH Differential Probe

Total Suspended Solid Probe

Turbidity Probe

Conductivity Probe

Sampling System

The UV400 can adapt to many different kind of sampling depending of the application : surface water, drinking water, process water or wastewater.

If the water is already pressurized, the sample can be admitted directly inside the analyser with a maximal pressure of 4 bars. Otherwise an optional built-in peristaltic pump, synchronised with the measurement to extend the tubing life time, allows to take the sample directly from a tank located up to 6 meters below the analyser.For demanding applications with long distances, another peristaltic pump in a separate enclosure is proposed as an option.For some applications on river water or wastewater where two sampling pumps are necessary, the UV400 delivers a relay contact to synchronise the primary pump. The delay and running time of each pump can be adjusted easily in the parameters menu of the analyser.In case filters are used in the sampling system, the UV400 is also able to provide a relay contact to clean the filter synchronised with the measurements.

UV400 Dimensional Drawing

Online water analyzer, UV400 - 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	+/- 0.2 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%
Chlorophyll A	0-100 μg/l ChlA	+/- 1 μg/l ChlA	+/- 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	+/- 2%
Hydrogen Sulphide	0-20 mg/l H2S	+/-1 mg/l H2S	+/- 2%
Turbidity (TSS by correlation)	0-100 NTU 0-1000 NTU	+/- 0.1 NTU +/- 1 NTU	+/- 2%
pH	0-14 pH	+/- 0.01 pH	+/- 2%
ORP	+/- 2000 mV	+/- 1 mV	+/- 2%
Dissolved Oxygen(DO)	0-25 mg/l O2	+/- 0.1 mg/l O2	+/- 2%
External turbidity (TSS by correlation)	0-4 NTU 0-40 NTU 0-400 NTU
External TSS	0-1500 mg/l TSS 0-30000 mg/l TSS	+/- 1% of reading or +/- 2 mg/l TSS +/- 1% of reading or +/- 2 mg/l TSS
Temperature	0-80°C	+/- 0.1 °C	+/- 2%

Online water analyzer, UV400 - 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 for PO4: 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	90 - 264 VAC 50/60 Hz 40 VA - 12v DC 3A maxi (except for NH4 or H2S)
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 with epoxy coating, IP65, wall mounting brackets
Dimensions	520 x 390 x 220 mm
Weight	20 to 30 kg depending on the configuration