While the theory of monitoring conductivity is simple, in practice it can be very frustrating. While simple 2-electrode sensors are inexpensive and can provide accurate data, continuous water quality monitoring of even relatively clean water can foul the electrodes and degrade the measurement. Maintaining accuracy is made more difficult when the amount of solids dissolved in the process varies over a wide concentration range.

ATI’s Q46C4 4-Electrode Conductivity Water Quality Monitor is the answer for monitoring almost any water-based process. Drinking water, plating bath solutions, cooling water, process wash water, or virtually any other aqueous system can be monitored accurately and reliably. The unique drive/control scheme used in the 4-electrode system allows a single sensor to be used in conductivity ranged from 0-200 μS to as high as 0-2,000 mS (0-2S). For chemical mixing applications, a concentration display can be selected.

Sensor Configurations:
Sensors for the Q46C4 system are available in a variety of mounting configurations: convertible-style with 1” NPT threads for pipe or tank mounting, 1-1/2” or 2” sanitary-style fittings in 316 stainless steel, and insertion-style for 1-1/4” NPT hot-tap assemblies that allow the sensor to be removed from service without shutting down the process. For low flow bypass applications, a Noryl sensor with quick-disconnect cable and acrylic flowcell are available.

Key Facts

  • Adaptability. Concentration version for direct display of chemical concentrations.
  • 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 conductivity and temperature.
  • Extra Outputs. Expansion board to add a third 4-20 mA analog output.
  • Flexibility. Wide range capability, with selectable ranges of 0-2000 μS up to 0-2.000 S, provides maximum application flexibility.
  • AC or DC Power Options. Power options include universal 100-240 VAC +/- 10% or 12-24 VDC.
  • PID Output. Standard PID control function assignable to one analog output.
  • Digital Communications. Available in either Profibus-DP, Modbus-RTU, 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 conditions. A scrolling second line on the display provides additional information and programming prompts.

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