PROBEST PUVCOD-900 UV254 spectrometer organic sensor measures COD/BOD/TOC without reagents. Direct immersion probe, auto cleaning, IP68, MODBUS RS485 for sewage, industrial & fishery wastewater online continuous monitoring
PROBEST PUVCOD-900 is a UV254 spectrometer organic water sensor adopting ultraviolet absorption principle to detect soluble organic pollutants in water by SAC254 spectral absorption coefficient. It can convert real-time data
into COD, BOD and TOC values via KHP calibration. This immersion online water probe requires no chemical
reagents, delivers fast response, supports automatic cleaning and MODBUS RS485 communication, widely used for
sewage plant, industrial effluent, surface water and aquaculture wastewater continuous organic load monitoring.
The PROBEST PUVCOD-900 Spectrometer Organic Sensor is a reagent-free in-situ water quality monitoring probe
independently developed by PROBEST, designed for long-term continuous online measurement of organic
contamination in all types of water bodies. Based on 254nm UV light absorption characteristics of dissolved organic compounds, the sensor calculates SAC254 absorption coefficient and converts readings to COD, BOD and TOC concentration with standard KHP calibration, eliminating the need for sampling, chemical reagents and complicated pre-treatment procedures compared with traditional laboratory chemical analysis methods.
Equipped with built-in automatic cleaning mechanism, the PUVCOD-900 effectively reduces biofouling and routine maintenance workload, featuring ultra-short response time for real-time continuous data output. Adopting SUS316L / titanium alloy body and IP68 waterproof protection, this COD BOD TOC sensor withstands freshwater and marine harsh environments, supporting MODBUS RS485 digital signal output for seamless integration with PLC, data loggers and remote water monitoring systems. It is the ideal online monitoring equipment for wastewater treatment plants, industrial discharge, river surface water and fishery breeding water organic pollution control.
H1：PROBEST PUVCOD-900 UV254 Spectrometer Organic Sensor | Reagent-Free Online COD BOD TOC Water Probe
H2：1. Measurement Principle of PROBEST PUVCOD-900 Organic Sensor
The PROBEST PUVCOD-900 spectrometer organic sensor relies on the unique UV absorption reaction of organic substances in water. When 254nm ultraviolet light passes through water samples, dissolved organic compounds will absorb UV light at 254nm wavelength. The sensor calculates the SAC254 spectral absorption coefficient according to light attenuation degree, then converts absorption data into COD, BOD or TOC concentration under KHP standard calibration conditions.
This optical UV detection method realizes fully continuous real-time monitoring without chemical reagents, avoiding secondary pollution caused by chemical digestion in traditional COD laboratory testing, greatly improving detection efficiency and reducing operation cost for long-term water quality supervision.
H2：2. Core Product Features
H3：2.1 Direct Immersion Probe Design, No Sampling & Pretreatment
The PUVCOD-900 adopts fully submersible integrated probe structure, which can be directly installed in sewage pools, drainage outlets, rivers and aquaculture ponds without sampling pumps, flow cells or pre-filtration devices, simplifying on-site installation construction.
H3：2.2 Zero Chemical Reagents, Eco-Friendly No Secondary Pollution
Unlike chemical digestion COD analyzers, this UV254 organic sensor does not consume any reagents during operation, no waste liquid discharge, meets environmental protection emission standards, lowers long-term operating cost for industrial wastewater monitoring stations.
H3：2.3 Fast Response Speed for Continuous Real-Time Measurement
Ultra-short signal response time supports uninterrupted 24h online data collection, capturing sudden organic load surges in sewage treatment process in real time, supporting early warning of pollution discharge abnormity.
H3：2.4 Built-in Automatic Cleaning Function, Low Maintenance Cost
The integrated self-cleaning device regularly cleans the optical window to prevent algae, sludge and biofilm adhesion, stabilize measurement accuracy and drastically cut manual maintenance frequency and labor cost.
H3：2.5 Industrial-Grade Durability & Stable Digital Communication
Sensor body optional SUS316L stainless steel (freshwater) or titanium alloy (marine seawater), IP68/NEMA6P full waterproof rating, MODBUS RS485 communication protocol compatible with most industrial control systems and water monitoring platforms.
H2：3. Main Application Scenarios
PROBEST PUVCOD-900 UV spectrometer organic sensor is widely applied in multi-industry online organic pollution monitoring:
Sewage treatment plant: Continuous organic load monitoring, real-time influent & effluent COD/BOD online supervision
Surface water monitoring: River, lake, reservoir organic matter long-term in-situ detection
Industrial wastewater discharge: Chemical, printing, food factory effluent TOC & COD continuous monitoring
Fishery & aquaculture wastewater: Breeding water organic contamination real-time tracking
Municipal environmental online monitoring stations, floating water quality buoys, drainage outlet automatic monitoring systems
H2：4. Complete Technical Specifications
| Parameter Item | Technical Data |
| Measuring Range (Calibrated by KHP) | COD: 0–1000mg/L (5mm light path); 0–90mg/L (50mm) BOD: 0–1500mg/L (2mm); 0–750mg/L (5mm); 0–60mg/L (50mm) TOC: 0–800mg/L (2mm); 0–400mg/L (5mm); 0–35mg/L (50mm) |
| Measurement Accuracy | ±5% (KHP Standard Solution) |
| Repeatability | ±2% (KHP Standard Solution) |
| Resolution | 0.01mg/L |
| Working Pressure | ≤0.4Mpa |
| Sensor Housing Material | SUS316L (Fresh Water); Titanium Alloy (Ocean Seawater) |
| Cable Material | PUR Waterproof Cable |
| Communication Protocol | MODBUS RS485 |
| Storage Temperature | -15℃ ~ 50℃ |
| Measuring Temperature | 0℃ ~ 45℃ (Non-freezing environment) |
| Overall Dimension | Diameter 69mm × Length 365mm |
| Net Weight | 3.2KG |
| Protection Grade | IP68 / NEMA6P |
| Standard Cable Length | 10m, Max Extendable to 100m |
H2：5. Advantages Compared with Traditional COD Testing Equipment
No reagent consumption: Save procurement, transportation and waste liquid disposal cost of chemical reagents
On-site direct measurement: Avoid sampling error caused by manual sampling and transportation
24h unattended monitoring: Auto cleaning reduces manual maintenance frequency
Multi-index simultaneous output: One probe outputs COD, BOD, TOC three core organic indicators
Digital RS485 output: Easy to connect with SCADA, PLC, environmental monitoring cloud platform
Wide adaptability: Two housing materials for freshwater and marine seawater scenarios
High protection level IP68: Stable operation under long-term underwater immersion
H2：6. Frequently Asked Questions (FAQ)
Q1: What is the measurement principle of PROBEST PUVCOD-900 organic sensor?
It uses 254nm UV absorption of dissolved organics, calculates SAC254 absorption coefficient and converts to COD/BOD/TOC via KHP calibration, reagent-free continuous online detection.
Q2: Can this UV COD probe work in seawater environment?
Yes. The PUVCOD-900 provides titanium alloy housing option specially for ocean/marine water, anti-corrosion for high salinity seawater monitoring.
Q3: Does the PUVCOD-900 need regular manual cleaning?
It has an automatic cleaning function to prevent optical window fouling, only simple regular inspection is required, greatly reducing maintenance work.
Q4: What communication mode does the sensor support?
Standard MODBUS RS485 digital communication, compatible with most industrial controllers, data loggers and remote water quality monitoring systems.
Q5: What water bodies is this spectrometer organic sensor suitable for?
Sewage plant inlet/outlet, industrial effluent, river surface water, lake reservoir, fishery aquaculture wastewater and other water quality online monitoring projects.
H2：7. Why Choose PROBEST PUVCOD-900 UV254 COD BOD TOC Sensor?
PROBEST is a professional manufacturer of water quality online monitoring sensors. The PUVCOD-900 spectrometer organic probe integrates mature UV254 spectral detection technology, with strict factory KHP calibration to guarantee ±5% high precision. The full IP68 waterproof immersion structure, optional anti-corrosion titanium alloy housing and automatic cleaning design adapt to complex industrial and environmental water conditions. All sensors support customized cable length up to 100m, stable MODBUS RS485 signal transmission, providing reliable long-term organic pollution monitoring solutions for global environmental protection, municipal sewage and industrial water treatment customers.
