Turbidity is a general indicator of the optical clarity of water and is defined as the amount of light scattered from particles in solution. In practice, a light beam is directed into a water sample and a photo detector measures the light scattered at 90-degrees to the incident light beam. While other scatter angles are possible, the 90-degree measurement angle has become the standard for turbidity measurement in most water systems.

It is used as a relative indicator of the amount of suspended solids in solution, and is measured in virtually all drinking water systems. It is also used in industrial water treatment systems as an indicator of product water quality. ATI’s Model Q46T Turbidity Water Quality Monitor is designed to meet the needs of both municipal drinking water systems and industrial water treatment for reliable, low-range turbidity measurement.

Using an infrared or energy source in this 90-degree scatter measurement, the system provides high sensitivity measurement with unmatched zero stability. Turbidity measurements down to 0 NTU or as high as 400 NTU can be measured with the same monitor, eliminating the need for separate high and low range instruments.

Key Facts

  • Flexibility: Wide range capability, with selectable ranges of 0-2.000, 0-20.0, 0-200.0 or 0-400.0 NTU provide maximum application flexibility.
  • AC or DC Power Options: Power options include universal 100-240 VAC +/- 10%, or 12-24 VDC.
  • 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.
  • 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.
  • Extra Outputs/Relays: Expansion board to add a third 4-20 mA analog output or to add three additional nonisolated low power relays.
  • PID Output: Standard PID control function assignable to one analog output.
  • Digital Communications: Communication options for Profibus-DP, Modbus-RTU, or Ethernet-IP.
  • 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, “dry cell”, and external light interference.

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