Horiba UV500
The UV500 is a on-line water analyser based on a high resolution UV-visible spectrograph.
It allows to monitor simultaneously many different parameters for waste water treatment plants or river monitoring stations with an excellent stability and low operating cost. The same spectrograph can measure organic matter, nitrate, colour, turbidity, phosphate, ammonia and hydrogen sulphide. A complementary UV-visible fluorescence module allows the measurement of aromatics hydrocarbons (PAH). Nephelometric turbidity by visible or infra-red laser diode is also available.
Measure. Monitor. Repeat.
For better insights, better decision-making and better process performance.
Benefits
- FFT signal processing ensures exceptional selectivity with no reported interferences
- Patented flow cell handles very high suspended solids without clogging
- Automatic turbidity compensation via dual-wavelength method
- Xenon flash UV lamp rated for 10⁹ flashes (≈10+ years at 1 measurement/min)
- Supports additional pH, ORP, dissolved oxygen and conductivity via external probes
- Fluorescence-based dissolved oxygen probe for high stability and low maintenance

Key Features
- High-resolution UV spectrograph with 2048 pixels, scanning 180–750 nm
- Direct absorbance measurements for UV254, COD, BOD, TOC, NO₃, Colour, PO₄ and Cr VI
- Fast, stable results using a simple hydraulic circuit
- Factory or multi-point local calibration for COD, BOD and TOC (UV alternative method)
- Much faster and lower maintenance than conventional COD/BOD/TOC methods once correlated
- Gas-phase measurement of ammonia and hydrogen sulphide after stripping
- Ideal for highly turbid or coloured samples (e.g. activated sludge)
Measuring principle by absorbance (liquid and gas phase)
1 : spectrograph
2 : beam splitter
3 : patented water flow cell
4&5 : xenon lamps
6 : gas flow cell
7 : gas pump
8 : stripping pot
9 : temperature probe
More info

UV fluorescence principle
1 : Xenon lamp,
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
Allows very high level of suspendedsolid without clogging for all the optical measurements making it suitable for industrial & municipal waste water application.
- The patented flow cell allows very high level of suspended solid without clogging for all the optical measurements making it suitable for industrial and municipal waste water application. The turbidity is automatically compensated by a dual-wavelength method.
- Suitable for sample with high chloride content
- Wetted parts of flow cell make it suitable for most corrosive sample
User-friendly interface
The colour touch screen (10.4") and intuitive interface available in 9 different languages (Chinese, English, French, German, Hungarian, 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. An acid resistant protection film on the screen assumes an efficient long term protection.
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 Standard 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 Standard channels (a MODBUS register tells which stream is currently being measured).
Sampling system
The UV500 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 UV500 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.
Autocleaning
The analyser is designed to automatically clean itself with an adjustable time range, typically 24 hours, using sulfuric acid 5%. This autocleaning with sulfuric acid 5% proves to be more efficient than water or air autocleaning for dirty and oily samples. It prevents any clogging in the hydraulic circuit from heavily charged water samples. This autocleaning design enables uninterrupted measurements and low maintenance.
Autozeroing
Sulfuric acid has no absorbance in the UV-visible, making it an ideal component to measure the zero. At the end of each autocleaning cycle, the zero is performed on the sulfuric acid 5%. This frequency of zeroing is the key for successful measurements as it prevents any drift in the zero to occur.
| Parameter | Standard Range | Other Ranges on Request | Typical Repeatability (<10% FS) | Accuracy (Standard Solution) |
|---|---|---|---|---|
| UV254 | 0–200 Abs/m | 0–600 / 0–2000 Abs/m | ±0.05 / ±0.15 / ±0.5 Abs/m | ±2% |
| COD (UV correlation) | 0–100 mg/l | 0–2000 / 0–20,000 mg/l | ±0.05 / ±1 / ±10 mg/l | ±2% |
| BOD (UV correlation) | 0–100 mg/l | 0–1000 / 0–10,000 mg/l | ±0.05 / ±0.5 / ±5 mg/l | ±2% |
| TOC (UV correlation) | 0–100 mg/l | 0–1000 / 0–10,000 mg/l | ±0.05 / ±0.5 / ±5 mg/l | ±2% |
| Ammonia (NH₄) | 0–100 mg/l | — | ±0.2 mg/l | ±5% |
| Nitrate (NO₃) | 0–100 mg/l | — | ±0.1 mg/l | ±2% |
| Colour | 0–100 Pt/Co | 0–1000 Pt/Co | ±0.2 / ±2 Pt/Co | ±2% |
| PAH (Aromatics) | 0–10 mg/l C₆H₆ | — | ±0.01 mg/l | ±2% |
| Oil in Water | 0–100 ppm | 0–1000 ppm | ±0.1 / ±1 ppm | ±2% |
| Phosphate (P-PO₄) | 0–2 mg/l | 0–20 mg/l | ±0.01 / ±0.1 mg/l | ±2% |
| Hydrogen Sulphide (H₂S) | 0–20 mg/l | — | ±1 mg/l | ±2% |
| Chromium VI | 0–2 mg/l | — | ±0.04 mg/l | ±2% |
| Turbidity (TSS correlation) | 0–10 NTU | 0–100 / 0–1000 NTU | ±0.01 / ±0.1 / ±1 NTU | ±2% |
| pH | 0–14 | — | ±0.01 pH | ±2% |
| ORP | ±2000 mV | — | ±1 mV | ±2% |
| Dissolved Oxygen | 0–25 mg/l O₂ | — | ±0.1 mg/l | ±2% |
| Conductivity | 0–2000 µS | — | ±1 µS | ±2% |
| External Turbidity | 0–4 NTU | 0–40 / 0–400 NTU | — | ±2% |
| External TSS | 0–1500 mg/l | 0–30,000 mg/l | ±1% of reading or ±2 mg/l | ±1% of reading or ±2 mg/l |
| Temperature | 0–80 °C | — | ±0.1 °C | ±2% |
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