DW-2100P Series Multi-Parameter Inline Analyzers for Drinking Water

The ‘Turn-Key’ Monitoring Solution for Drinking Water.

The DW-2100P series are multi-parameter inline water analyzers specifically designed as a ‘Turn-Key’ monitoring solution for clean water applications.

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The DW-2100P series are multiple parameter inline water analyzers specifically designed as a ‘Turn-Key’ monitoring solution for clean water applications including:

  • Drinking Water Networks
  • Secondary Water Supply
  • Decorative/Swimming Water Applications

The DW-2100P series offers highly accurate, real-time measurement, display and data logging of Ultra-Low Turbidity, Free Chlorine, pH and Temperature. So, the DW2100P series is a convenient and easy to integrate panel mounted format for rapid installation and simple maintenance. Equipped with Touch screen display and data logging terminal,

Furthermore, the DW-2100P integrates two unique Pyxis Lab® smart sensors. The ST-765SS-FCL measures Free Chlorine, pH and temperature of the sample water. This sensor is membrane-free and incorporate Pyxis’ advanced technology. In the field of bare-gold electrochemical detection. In addition, the ST-765SS-FCL sensor integrates free chlorine, plus pH measurement. It can perform temperature and pH compensation for the measurement of free chlorine based on conditions present in the application of use. So, this unique internal compensation results in a highly accurate oxidizer measurement consistent with DPD wet chemistry methodology as high as pH 9.0 and meets EPA-334.0 compliance.


Therefore, the LT-739 sensor offers a unique flat surface distal end in a quartz glass plate. Allowing for extended cleanliness, easy maintenance and prevention of air bubble interference. With a detection range of up to 40 NTU and an industry low resolution of 0.001 NTU, the LT-739 sensor is designed for optimal accuracy and performance. The LT-739 uses 90º surface scatter configuration and Warm White Light (LED) or InfraRed (LED), making it EPA-180.1 and ISO-7027 compliant respectively.

The DW-2100 analyzer requires a small installation footprint and offers simple operation and maintenance and is specifically designed for use in domestic and drinking water applications. The analyzer is also available with an optional Pyxis CloudLink™ 4G remote gateway. The CloudLink™ can upload on-site analyzer data to a cloud server in real-time and allow for additional sensor/device inputs for cloud access. See specifications for details.

Typical Applications

  • Drinking Water
  • Domestic Water
  • Secondary Water Supply
  • Sanitary Water
  • Decorative Water
  • Swimming Water
  • Food & Beverage Process Water


  • Our Advanced Research & Development has provided Sensor Technologies that achieve Highly Accurate & Stable Measurement of Turbidity, Free Chlorine, pH and Temperature
  • The LT-739 (EPA) and the LT-739B (ISO) ultra-low resolution turbidity sensors offer a detection light source. Using warm white LED in 90-degree surface scatter format in accordance with USEPA 180.1 standards or Infra-Red 860nm in accordance with ISO-7027.1 standards. Therefore, the turbidity sensors are mounted in the unique Pyxis FR- 200 dual sensor flow reservoir. Enabling the highest resolution possible of 0.001NTU with unmatched stability. The LT-739 and LT-739B offers simple calibration via the LT-SOLID-CAL Solid State Turbidity Calibration Kit (no Formazin needed) or the Pyxis L-CAL Portable Liquid Turbidity Calibration Kit (uses 500mL per calibration).
  • The ST-765SS-FCL three-parameter composite sensor is used for the measurement residual free chlorine. The pH and temperature in compliance with USEPA 334.0 and ISO-7393 guidelines. So, the sensors advanced PCB offers built-in temperature and pH parameter compensation (up to pH 9.0) algorithms eliminating the need for a supplemental pH sensor and controller. Furthermore, the unique Bare-Gold electrode technology for residual chlorine measurement eliminates membranes and electrode solution replenishment commonly associated with conventional sensors. The ST-765SS-FCL has a uniquely designed flat bubble pH electrode design for reduced fouling potential. Reduce your maintenance and cost versus colorimetric chlorine measurement or conventional electrochemical sensors by utilizing Pyxis replaceable Electrode Head (EH-765) for this sensor allowing for years of reliable service. So, the ST-765SS-FCL may be calibrated in-situ after cleaning via DPD Free Chlorine wet chemistry test measurement of active sample.

Additional features

  • In addition, the FR-200 Dual-Sensor Flow Reservoir provides sample calming for dissipation of air bubbles. Settling of suspended solids, foam or other impurities commonly observed in drinking water.  Influent with a recommended flow range of 600–1,000mL per minute. This unique flow reservoir design results in the highest level of turbidity resolution on the market. Greatly extending the maintenance cycle of the sensor while providing a large buffer capacity to mitigate pressure fluctuations. The minimum inlet pressure of FR-200 flow reservoir is only 7.5 psi (0.05mpa) making it highly suitable for the end of pipe networks and secondary supply influent sampling.

  • Both Sensors offer self-cleaning flat electrode designs, making them easy to maintain and clean.
  • Simple removal and replacement. Both sensors are connected to the display and data logger via RS-485 Modbus (RTU) allowing for integrated sensor calibration interference and diagnostics within the display touch screen.
  • Convenient and simple to install Back-Panel (DW-2100P) for rapid and easy installation. Truly a plumb and power to go platform with intense factory setup, testing and sensor calibration prior to shipment.

  • Touch screen display and data logger interface with sensor calibration integrated. Display/data logger offers 2x 4- 20mA I/O as well as RS-485 and TCP-IP with remote diagnosis and parameter adjustment.



Item DW-2100P-US DW-2100P-EU
Part Number 42135 42136
Turbidity Wavelength Warm White LED 860nm LED
Turbidity Dual Range 0.001-10 / 10-40.00 NTU 0.001-10 / 10-40.00 NTU
Turbidity Accuracy ±0.005NTU or 2% <10NTU ±0.005NTU or 2% <10NTU
Turbidity Repeatability ±0.001NTU or 0.5% <10NTU ±0.001NTU or 0.5% <10NTU
Free Chlorine Method Bare Gold Electrochemical Method Bare Gold Electrochemical Method
Free Chlorine Range 0.01-5.00ppm as FCl2 0.01-5.00ppm as FCl2
pH Method Electrochemical Method Electrochemical Method
pH Range 0.01-14.00 pH 0.01-14.00 pH
Measurement Accuracy 0.001NTU or 1% Full Scale

±0.01ppm or 1% Full Scale with pH Compensation to 9.0


0.001NTU or 1% Full Scale

±0.01ppm or 1% Full Scale with pH Compensation to 9.0


Minimum Resolution 0.001NTU, 0.01ppm, 0.01pH 0.001NTU, 0.01ppm, 0.01pH
Response Time 4s After Immersion – Turbidity, T95≤60s – Free Chlorine, T95≤5s – pH 4s After Immersion – Turbidity, T95≤60s – Free Chlorine, T95≤5s – pH
Compliance EPA-180.1/334.0 ISO-7027/7393
Measurement Interval Continuous Measurement Continuous Measurement
Display 7in LCD Color Industrial Capacitive Touch Screen 7in LCD Color Industrial Capacitive Touch Screen
Storage Capacity Built-In 4GB of RAM for Storing up to 1m Data/Event Records Built-In 4GB of RAM for Storing up to 1m Data/Event Records
Power Requirement 96-260VAC / 50-60Hz; 10A Fuse; 200W 96-260VAC / 50-60Hz; 10A Fuse; 200W
Output (3) 4-20mA/RS-485 Modbus – RTU/Modbus TCP (3) 4-20mA/RS-485 Modbus – RTU/Modbus TCP
Input (3) 4-20mA/RS-485 Modbus – RTU (3) 4-20mA/RS-485 Modbus – RTU
USB (1) USB Host, For Data Downloading & Screen Upgrade (1) USB Host, For Data Downloading & Screen Upgrade
Internet RJ-45 Socket, Modbus-TCP RJ-45 Socket, Modbus-TCP
Panel Operational Temperature 40-113 °F (4-45 °C) 40-113 °F (4-45 °C)
Storage Temperature Instrument: -4-131 °F (-20-55 °C) / Sensors: 32-122 °F (0-50 °C) Instrument: -4-131 °F (-20-55 °C) / Sensors: 32-122 °F (0-50 °C)
Sample Water Temperature 40-104 °F (4-40 °C) 40-104 °F (4-40 °C)
Sample Water Pressure 7.25-30psi (0.05-0.2MPa) 7.25-30psi (0.05-0.2MPa)
FR-200 Water Flow Rate 600-1,000mL/minute 600-1,000mL/minute
FR-200 Line Size 1/4″ Inlet / 3/4″ Overflow / 20mm Outlet / 1/2″ Drain 1/4″ Inlet / 3/4″ Overflow / 20mm Outlet / 1/2″ Drain
Rating IP65 Panel Display / IP67 Sensors IP65 Panel Display / IP67 Sensors
Regulation CE / RoHS CE / RoHS
Relative Humidity 20-90% (No Condensation) 20-90% (No Condensation)
Altitude <6,561ft (<2,000m) <6,561ft (<2,000m)
Panel Dimensions 790Hx450Wx235D mm 790Hx450Wx235D mm
Weight 20kg 20kg
4G CloudLink N/A N/A

Support Documents

DW-2100P Series User Manual V1.11

DW-2100P Series Data Sheet

Replacing Electrode Head



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