Typical Applications
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This online COD analyzer can be used in small and medium-sized wastewater treatment plants that need to monitor organic concentration trends, for continuous monitoring of dissolved organic pollutants in water.
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Water quality monitoring at the inlet and outlet of wastewater treatment plants, providing users with continuous and stable measurement data at low operating costs.
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In wastewater treatment processes, it is necessary to control the balance between organic load, aeration rate, and nutrients. Using UVAS eco sc
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The UV absorption online analyzer can provide continuous organic matter trend data, helping operators optimize the process.
Instrument Features
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This online COD analyzer has low operating costs, with only the sealing ring and wiper blade as consumable parts.
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Economical product of UVAS, at a lower price.
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Stainless steel material, sturdy and durable.
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Integrated automatic wiper cleaning function, ensuring low maintenance requirements even under very demanding application conditions, with no additional installation and maintenance required (e.g., compressor).
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Plug and play.
Principle of Operation
When organic substances containing conjugated double bonds or polycyclic aromatic hydrocarbons are dissolved in water, they absorb ultraviolet light. Therefore, by measuring the degree of absorption of 254 nm UV light by these organic substances, we can assess the degree of organic pollution in the water body. The “specific absorption coefficient”, namely SAC254, is the physical quantity used to measure the total amount of organic pollutants in water. This online COD analyzer consists of a controller and a measuring probe. When the measuring probe is in operation, it needs to be immersed in water, or water is pumped up to flow through the gap. When the light emitted by the light source in the probe passes through the gap, part of the light is absorbed by the sample flowing through the gap, while the rest of the light passes through the sample and reaches the beam splitter on the other side of the probe, where it is split into two beams: 50% of the light is detected by the sample detector, and the other 50% is detected by the reference detector. This online COD analyzer compares the signals from the two detectors to provide the “specific absorption coefficient”, namely SAC254.
Technical Specifications
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Measuring technique: UV absorption measurement (dual-beam technology), no chemical reagents required
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Resolution: 0.5 m-1 or mg/L or ppm
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Accuracy: ±5% of measured value, ±10 m-1, whichever is greater
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Measuring optical path: 1mm
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Measuring range: 5-1500 m-1
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Compensation wavelength: 550nm
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Response time: ≥5 minutes, or longer
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Cable length: 10m, extendable to 100m
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Analog output: Two 0/4~20mA outputs (via sc200)
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Probe pressure limit Max. 0.5bar
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Ambient sample temperature +2~+40℃
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Water sample pH: 4.5~9
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Dimensions: Approx. 75×323mm
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Weight: Approx. 3.3kg
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Service interval: 6 months
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User maintenance: Typically 1 hour/month
Ordering Guide
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Standard configuration includes: UVAS eco sc sensor, sc200 or sc1000 controller, sensor mounting accessories
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LXV443.80.10002 UVAS eco sc probe, 1mm optical path
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LZX414.00.10000 Sensor mounting accessories
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sc200 Controller (must be ordered separately)
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LXV404.99.00552 Standard sc200 controller, digital probe, dual channel, 220V
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LXV404.99.01552 sc200 controller with RS232/RS485 MODBUS network card, digital probe, dual channel, 220V
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sc1000 Controller (must be ordered separately)
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LXV402.99.00002 sc1000 display module
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LXV400.99.1R572 sc1000 probe module, 4 sensors, 4mA input, 4mA output, 4 relays, 110-230V
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LXV400.99.1B572 sc1000 probe module, 4 sensors, 4mA input, 4mA output, 4 relays, RS485(MODBUS), 110-230V
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LXV400.99.1F572 sc1000 probe module, 4 sensors, 4mA input, 4mA output, 4 relays, PROFIBUS DP, 110-230V
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LXV400.99.1R582 sc1000 probe module, 6 sensors, 4mA input, 4mA output, 4 relays, 110-230V
Source: Public information from HACH Water Quality website
Case Studies
Municipal Wastewater Treatment · Controllers and Sensors — Application Case
Site Conditions
This is a Municipal Wastewater Treatment customer whose plant is at the inlet, biological and outlet stages of a municipal plant. The main task was online water monitoring with a controller and sensor combination.
The Problem
The difficulty lies in high solids and corrosive fractions, with large diurnal flow swings; at the same time effluent parameters drift and probes foul with sludge and biofilm. Specification therefore means matching each controller channel to its sensor type.
What We Did
We took a Hach channel approach — supplying against the Hach original part numbers. Delivery was built around matching each controller channel to its sensor type, with point-by-point checks on: stable compliance with Grade 1A discharge limits and online data reporting.
Operating Outcome
In service the system performs as intended — factory-matched combinations that make faults easier to locate, with routine maintenance falling noticeably.
Food & Beverage · Controllers and Sensors — Application Case
Application Context
dosing, pasteurising, filling and CIP stages is a typical Food & Beverage duty. The project started from Controllers and Sensors, focusing on online water monitoring with a controller and sensor combination.
Process Constraints
frequent cleaning demands instruments that withstand hot CIP/SIP caustic cycles, and syrups, dairy and beverages that scale easily, under strict hygienic requirements only amplify it. The Controllers and Sensors specification must therefore cover matching each controller channel to its sensor type.
Delivery Approach
Delivery was handled as the Hach channel — supplying against the Hach original part numbers. Execution centred on matching each controller channel to its sensor type, together with food-safety and hygienic design per 3-A / EHEDG.
Field Results
Operation shows the benefit clearly — factory-matched combinations that make faults easier to locate, with confidence in this measuring point improving markedly.
Chemical & Pharmaceutical · Controllers and Sensors — Application Case
Customer Profile
The typical setting in Chemical & Pharmaceutical is reactors, metering vessels and finished-product tanks. The measuring point is Controllers and Sensors; the focus is online water monitoring with a controller and sensor combination.
Key Difficulties
Conditions are highly corrosive media with solvents and crystallisation, partly in explosive atmospheres and, on top of that, corrosion plus Ex protection shortens instrument life and makes downtime costly, which a standard configuration cannot handle for long. The design therefore starts with matching each controller channel to its sensor type.
Implementation
The scope ran through the Hach channel: supplying against the Hach original part numbers. Technically it hinges on matching each controller channel to its sensor type, and on these requirements: Ex certification and GMP traceability of records.
Customer Benefit
In practice this means factory-matched combinations that make faults easier to locate, which cut the workload on the site maintenance team.
Power & Energy · Controllers and Sensors — Application Case
Project Background
The project covers boiler feedwater, turbine condensate and FGD/DeNOx systems. The work centres on Controllers and Sensors and the core task is online water monitoring with a controller and sensor combination.
Operating Challenges
The medium and duty are characterised by high temperature and pressure with both steam and saline water, and drift under high temperature and pressure, with very costly unplanned outages. So Controllers and Sensors cannot be specified generically — it calls for matching each controller channel to its sensor type.
Solution
The Ainstru engineering team worked through the Hach channel: supplying against the Hach original part numbers. The configuration involves matching each controller channel to its sensor type, with these requirements in view: compliance with power-industry codes and unit availability targets.
Results
Since start-up the system has run steadily; the practical result is factory-matched combinations that make faults easier to locate.
Related Products
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HACHsc turbidity / suspended solids (sludge) analyzer
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HACH9582 dissolved oxygen meter
HACH