UV Absorption and Turbidity in a Single Sensor

UV-254 measurements are a practical indicator of dissolved organic compounds in water. Traditional methods such as TOC, COD, and BOD all capture more organics and other potential contaminants but have the drawback of being expensive and maintenance intensive. In fact, most are done only in the laboratory due to the complexity of on-line systems.

UV-254 measurement is much simpler and can be correlated to DOC levels. It has the advantage of being nearly real time, providing input to treatment control systems and alarming of abnormal conditions. Routine maintenance consists of cleaning the optical surfaces, which is generally simple and quick.

The Q46UV sensor provides additional optical measurements for added measurement capabilities and increased reliability. Infrared sensors for measuring both 90° Scatter Turbidity and IR absorption are built into the UVA sensor. These additional optics allow for the measurement of both UV-254 and Turbidity, a unique capability to enhances the usefulness of the monitoring package, especially in raw water monitoring applications. The IR absorption measurement is used to correct measurements for minor optical fouling that can occur over weeks or months of operation.

Sensors in contact with raw or settled water samples may experience fouling from iron and manganese. Prechlorination causes iron and manganese to precipitate out of solution and coat surfaces that are in contact with the sample. While manual sensor cleaning is easy, ATI offers Q-Clean, an automatic sensor cleaning system that reduces user maintenance.

The cleaning system consists of an automatic sensor wash system that injects a cleaning solution into the sensor flow chamber at the frequency programmed by the operator. The cleaning solution contains chemicals that dissolve iron and manganese that has accumulated on optical surfaces.

PRODUCT FEATURES

AC or DC Power Option

Power options include universal 100-240 VAC +/- 10%, or 12-24 VDC.

Extra Outputs

Expansion board to add a third 4-20 mA analog output or to add three additional non-isolated low power relays.

Flexibility

Wide range capability, with selectable ranges of 0-2.000, 0-20.00, 0-200.0 and 0-400 NTU provide maximum application flexibility.

Analog Output Options

Two isolated 4-20 mA outputs are standard, with an option for a third output if required. Default setting provides analog outputs for turbidity and temperature.

PID Output

Standard PID control function assignable to one analog output.

Digital Communications

Communication options for Profibus-DP, Modbus-RTU, Modbus-TCP/IP or Ethernet-IP.

Relay Contacts

Three SPDT relays are standard, with relay functions programmable for alarm, control, or trouble indication. Three additional low power relays available as an option.

Flexible Mounting

NEMA 4X (IP-66) enclosure is suitable for wall, pipe, or panel mounting.

Clear Display

Back-lit large LCD display provides clear visibility in any lighting condition. A scrolling second line on the display provides additional information and programming prompts.

Sensor Diagnostics

System automatically checks for sensor fouling.