Water Hardness Analyzer


ETX + S80 Water Hardness  Analyzer and Control System

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  • Measurement Range: 1ppm to 40,000ppm (3-11 pH), 5 x 10-7 molar to 1.0 molar
  • Temperature Range: 0°C to 40°C (32°F to 104°F)
  • Pressure Range: 0 to 50 psig (0 to 3.5 bar)
  • Accuracy / Repeatability: Better than 5% of calibrated range
  • Response Time: T90 in 10 seconds
  • Electrode Life: 6 to 12 months
  • Interfering ions: Lead (ll), Mercury (ll), Iron (ll), Ammonium
  • Wetted Materials: Radel, epoxy, PVC, PTFE, 316 SS, Viton O-Ring
  • S80 Process Connection: 3⁄4” Stainless MNPT compression fitting with 10ft cable
  • Optional Retractable Ball valve assembly: 1” MNPT Ball Valve
  • Optional Dual channel version with 2 x 4-20mA outputs, Relays, Modbus, or HART
  • Recommended for use with EMEC NPED3 sensor holder

Model ETX Transmitter Data Sheet
Model ETX Instruction Manual
S80 Calcium Ion Sensor Data Sheet
ETX + S80 Calcium Electrode Addendum v1.4
Ion Selective Sensor Addendum V2

SKU: ETX-10-210-01 & S80-00-0002-0100-074 Categories: , Tags: ,


The RealTech Controls model ETX Water Hardness Analyzer / Controller offers cost-effective, user-friendly control of Calcium Carbonate (CaCO3) for Industrial Water Treatment applications. Water Hardness is caused by the presence of calcium and magnesium carbonates. The ratio of calcium to magnesium is generally fixed, typically in the ratio 3:1 (Ca:Mg), therefore Total Hardness can be inferred, by knowing the amount of calcium present.

Together with the S80 Calcium ion sensor, the model ETX water hardness analyzer provides online, real-time values of water hardness, and incorporates programmable mA and relay outputs for control and monitoring. The user-friendly menu structure provides for quick access calibration and if you are familiar with programming other brands of controllers, you will find this to be the cutting edge and easiest of set-ups.

It is recommended that the EMEC NPED3 sensor holder is installed together with the S80 sensor, to ensure the sensor tip remains submerged at all times with relatively even flow.

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