Hach AV9000S User Manual

Also see for AV9000: User manual

Contents

Hach AV9000S User Manual Manual pdf 8 page image

• Objects such as rocks, pipe joints, or valve stems create turbulence and generate high-speedflows near the object. Make sure the area 2 to 4 pipe diameters in front of the sensor installation isclear of obstructions. Best accuracy is obtained when there are no flow disruptions within 5 to10 pipe diameters.• Do not use sites with low-velocity flows that create silt buildup in the invert or channel. Buildup ofsilt near the sensor can inhibit the Doppler signal and cause inaccurate sensor readings and depthmeasurements.• Do not use sites with deep rapid flows where sensor installation would be difficult or dangerous.• Do not use sites with high-velocity, low-depth flows. Splash-over and excessive turbulence aroundthe sensor can cause inaccurate data.InterferenceThe AV9000 interface module includes a sensitive radio-frequency receiver capable of the detectingvery small signals. When connected to a flow logger or sampler communications or auxiliary powerports, some line-powered equipment can add electrical noise that interferes with Doppler velocitymeasurements. Interference with measurements is uncommon in typical sites.The AV9000 is most sensitive to noise falling within its Doppler analysis span of 1 MHz ± 13.3 kHz.Noise at other frequencies typically does not cause interference.Some laptop computers can cause interference problems when operated from external AC poweradapters. If such a device has an effect on the measurements, operate the laptop computer withbatteries or disconnect the cable between the laptop computer and the flow logger or sampler.Install the AV9000 interface moduleThe submerged AV sensor connects to a FL series flow logger or AS950 sampler through anAV9000 interface module. Refer to Replacement parts and accessories on page 19 to identify theapplicable AV9000 interface module for the flow logger or sampler.Note: The submerged AV sensor connects directly to Sigma flow meters. An AV9000 interface module is notnecessary.1. Install the AV9000 interface module. Refer to the AV9000 documentation for instructions.2. Connect the sensor cable to the AV9000 interface module. Refer to the AV9000 documentationfor instructions.3. Connect the AV9000 cable to a sensor port (or terminal) on the flow logger or sampler. Refer tothe flow logger or sampler documentation for instructions.Attach the desiccant hubAttach the desiccant hub to the flow logger or sampler to give strain relief to the sensor cable and theconnector. Refer to Figure 3 to Figure 5.For the best performance, make sure to install the desiccant container vertically with the end cappointed down. Refer to Figure 3 to Figure 5.8 English