HI7660-28 Low Range Turbidity Probe The HI7660-28 are nephelometric turbidity probes designed for use with Hanna Instruments® HI510 or HI520 Universal Process Controller. The system is designed to measure low turbidity values according to the nephelometric method (ISO 7027 – EN 27027). An integral temperature sensor measures water temperature and adjusts the probe signal for temperature-related changes over the range of 0 to 50 °C (32 to 122 °F). The controller displays both measurements simultaneously. Turbidity is a key indicator of water quality and e¨ectiveness of water ltration. The system is suitable for applications in drinking water, municipal and industrial water treatment, desalination and water quality monitoring. The majority of low-measurement applications using the HI7660-28 probe require installation in a pressurized ºow cell. The HI7676602 and HI7676606 ºow cells are designed to eliminate ambient light e¨ects and maintain sample pressure inside the ºow cell. This minimizes sample out-gassing, a common problem in many turbidity systems that can cause measurement errors. HI7676602 is equipped with a needle valve and recommended for readings below 40 FNU. HI7676606 is equipped with ttings for larger pipes and recommended for readings above 40 FNU. • Digital probe stores model, firmware version, and serial number • Built-in temperature sensor for measurement and compensation • Stored calibration data includes: calibration date and time, turbidity calibration standard, offset, and slope • ISO 7027 sensors use a near infrared light-emitting diode (LED) to eliminate color interference • Factory calibrated turbidity probe • Adheres to ISO 7027 – EN 27027 standards Principle of Operation Turbidity is a term that denes the opaqueness or cloudiness of water. The HI7660-28 are optical probes that follow ISO 7027 – EN 27027 standards. The unit of measure is FNU. A light beam from an infrared source is sent through an optical window of the probe into the sample. The light is scattered by suspended particles in the sample. The 90° scattered light is reºected through a second window where it is converted to an electrical signal proportional to the turbidity of the standard or sample. The HI7676602 and This minimizes Digital probe stores model, firmware version, and serial number Built-in temperature sensor for measurement and compensation Stored calibration data includes: calibration date and ISO 7027 sensors use a near infrared light-emitting 15 Process Instrumentation 15.58 | www.hannainst.com controllers
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