Continuous online UV254 (SAC254) absorption monitoring for accurate determination of organic load in raw water, process water and wastewater applications.
The AMI SAC254 is a high-precision online UVT analyser for continuous measurement of UV absorption at 254 nm (UV254 / SAC254). Engineered for accurate determination of organic load, it uses Swan’s patented dynamic measurement principle to deliver exceptional stability across a broad measuring range.
UV absorption at 254 nm (SAC254) is a proven surrogate parameter for assessing dissolved organic carbon (DOC) and total organic carbon (TOC). Continuous real-time trending enables early detection of contamination events and optimisation of treatment performance.
Specifications
- Insensitive to fouling of optical components due to the patented dynamic measurement principle.
- Broad measuring range from 0 up to 300 m-1 due to flexible optical path length.
- Wide measuring path providing an exceptionally broad measuring range from 0 to 300 m-1.
- Continuous UV absorption measurement for real-time organic load monitoring.
- Cost-effective measurement of surrogate parameters such as TOC, DOC, BOD and COD.
- Grab sample function for manual measurement, verification and calibration.
SAC 254 Specifications
UV absorption measurement
| Measuring range | 0 to 300 m-1 / 0 to 100% UVT |
|---|---|
| Measured parameters | Absorbance, UVT, concentration |
| Wavelength | 254 nm |
| Measuring interval | 30 sec. to 3 min. |
| Precision | ± (1% + 0.01 m-1) |
Power supply
| Voltage | 100 – 240 VAC (±10%), 50/60 Hz / 10 – 36 VDC |
|---|
Sample conditions
| Flow rate | 2 to 12 L/h |
|---|---|
| Temperature | 5 to 30 °C (not higher than ambient temperature) |
| Inlet pressure | 0.5 to 10 bar (with flow controller option) |
| Outlet pressure | Pressure free |
AMI SAC254 FAQs
What is UVT?
UVT (Ultraviolet Transmission) is the percentage of ultraviolet light at 254 nm that passes through a water sample. It indicates how much UV light is absorbed by dissolved organic compounds and other substances in the water.
Higher UVT values mean the water transmits more UV light and contains lower levels of UV-absorbing organic material. Lower UVT values indicate higher organic load and reduced UV disinfection efficiency.
UVT is commonly used in potable water, wastewater, industrial, pharmaceutical and power applications to assess organic contamination and optimise UV treatment performance.
What is a UVT analyser and how does it work?
A UVT analyser measures ultraviolet transmission (UVT), typically at 254 nm, to determine how much UV light passes through a water sample over a defined path length. UVT is expressed as a percentage and indicates the presence of UV-absorbing substances in the water, most commonly dissolved organic matter.
The instrument directs UV light through the sample and measures the light intensity on the opposite side. As the concentration of UV-absorbing substances increases, ultraviolet absorption (UV254) increases and UVT correspondingly decreases.
What does the AMI SAC254 measure?
The AMI SAC254 continuously measures ultraviolet absorption at 254 nm (UV254 / SAC254) to provide real-time monitoring of organic material in water. Because many organic compounds absorb UV light at this wavelength, it is a reliable indicator of organic load. The instrument reports absorbance (SAC254), calculates ultraviolet transmission (UVT), and can provide values that correlate to parameters such as Total Organic Carbon (TOC) and Dissolved Organic Carbon (DOC).
Why is UV254 / SAC254 useful for water quality monitoring?
UV254 / SAC254 is useful because many organic compounds absorb UV light at 254 nm, making it a reliable indicator of organic matter in water. It correlates well with parameters such as TOC and DOC and is widely used in potable water, wastewater and industrial applications to track organic load and detect changes in water quality.
What industries is the AMI SAC254 suitable for?
The AMI SAC254 is currently used in potable water, wastewater, industrial, power, pharmaceutical and hydrogen production water systems. It is useful anywhere continuous monitoring of organic load and UV transmission is critical to process control and compliance.
How does the AMI SAC254 deliver continuous monitoring?
The SAC254 uses a patented dynamic optical measuring principle that captures UV absorption continuously and automatically refills and empties its optical cuvette. This design keeps the measurement stable over time and compensates for fouling or ageing of optical components.
Can the AMI SAC254 help optimise treatment processes?
Yes. Continuous UV254 or UVT trending allows operators to detect changes in organic load early, adjust coagulation/flocculation dosing, control activated carbon beds and improve UV disinfection efficiency, helping both operational control and compliance.
Contact us to place an order.
Downloads
| Brochure | Product Flyer |
| Manual | Manual |
| Datasheet | Datasheet |
