Pyxis DW-739 Series Drinking Water Turbidity Analyzer

The Pyxis DW-739 series is a single-parameter, plug-and-play turbidity analyzer panel for drinking water and secondary water supply lines. It combines the LT-739 ultra-low turbidity sensor with an FR-100 flow reservoir and a 7-inch touch screen display and data logger in one installed package, shipped with factory installation, testing and sensor calibration completed. The sensor uses the same optical principle as the Pyxis LT-73X family. Mikron Proses (Üsküdar, Istanbul) provides application consulting on choosing the compliance standard and the CloudLink 4G option.

Drinking water turbidity · Secondary water supply → Send us your requirement

For the measurement background, see the guides on turbidity in drinking water and online turbidimeters. A panel that also measures free chlorine and pH is described on the DW-2100P page.

Model options: EPA or ISO compliance

The DW-739 uses a warm white LED light source and is EPA-180.1 compliant; the DW-739B uses an 860 nm infrared LED and is ISO-7027 compliant. Both measure over a dual range of 0.001-10 / 10-40.00 NTU, with accuracy of ±0.005 NTU or 2% below 10 NTU, repeatability of ±0.001 NTU or 0.5%, and a minimum resolution of 0.001 NTU; the sensor responds 4 seconds after immersion. The ‘-G’ versions (DW-739-G, DW-739B-G) have the same sensor and measurement performance plus a Pyxis CloudLink 4G gateway that can upload field data to the cloud in real time.

FR-100 flow reservoir

The sensor is installed in a self-regulating FR-100 single-sensor flow reservoir with rotameter and pressure reducing valve (PRV). The reservoir calms the sample so that air bubbles, suspended solids and foam, which are common in drinking water influent, settle before the measurement. Inlet pressure must be between 0.05 and 0.2 MPa and flow between 200 and 1,800 mL/min; the sample inlet is 1/4-inch OD, the overflow goes to drain through a 20 mm outlet, and the drain is 1/2-inch NPT. The reservoir needs only 0.05 MPa minimum inlet pressure, so the analyzer can also be used at the end of pipe networks and for secondary water supply sampling.

Display, outputs and power

The analyzer works through a 7-inch color industrial capacitive touch screen and data logger that stores up to 1 million data and event records in 4 GB of built-in memory. Sensor calibration and diagnostics are done from the screen. The display provides 2 × 4-20 mA and RS-485 Modbus (RTU/TCP) outputs and 2 × 4-20 mA and RS-485 Modbus (RTU) inputs, and can pass the signal through to an existing PLC or DCS network. The panel runs on 96-260 VAC at 50-60 Hz (10 A fuse, 200 W). Panel operating temperature is 4-45 °C and sample water temperature is 4-40 °C. The panel and display are IP-65 and the sensor IP-67; the panel measures 790 × 450 × 231 mm (H × W × D) and weighs about 15 kg.

Calibration

The LT-739 and LT-739B sensors can be calibrated with the LT-SOLID-CAL solid-state kit, which needs no formazin, or with the L-CAL portable liquid kit, which uses 500 mL of formazin per calibration. For NSF certified applications, the analyzer discharge of about 200-400 mL/min can be sent to a sanitary drain or returned to the inlet of the pretreatment system.

Ordering information

The DW-739 (P/N 42143) and DW-739-G (P/N 42145) are for EPA-180.1 markets; the DW-739B (P/N 42144) and DW-739B-G (P/N 42146) are for ISO-7027 markets. Send us your requirement and we will select the compliance standard and CloudLink 4G option together.