2150EX AV Flow Module - Isco

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2150EX Area Velocity Flow System Section 2 Preparation and Installation 2.2 Preparation A 2150EX flow system may be a portable installation, powered by a 2191EX or 2196EX battery module (described in Section 2.4), or a permanent installation, powered from the safe area by the 2194EX network interface module (described in Section 2.5). While a 2150EX system with proper installation and operation meets ATEX requirements for use in defined hazardous locations, these requirements must also be observed with regard to associated tools and equipment at the site. WARNING Intrinsic safety is dependent on proper installation in accordance with IEC 60079-14 and IEC 60079-17 International Standards, or ATEX Group II, Category 1G or 2G requirements of the authority that has jurisdiction for the installation of equipment in hazardous areas at your specific installation site. Installation should be performed only by trained and qualified personnel. 2.2.1 Safety WARNING Avoid hazardous practices! If you use these instruments in any way not specified in this manual, the protection provided by the instruments may be impaired; this will increase your risk of injury. WARNING The installation and use of this product may subject you to hazardous working conditions that can cause you serious or fatal injuries. Take any necessary precautions before entering a worksite. Install and operate this product in accordance with all applicable safety and health regulations, and local ordinances. WARNING Manually ensure that all equipment is electrostatically grounded at the installation site before any portion enters the hazardous area. The 2150EX module components are often installed in confined spaces. Some examples of confined spaces include manholes, pipelines, digesters, and storage tanks. These spaces may become hazardous environments that can prove fatal for those unprepared. In the United States, these spaces are governed by OSHA 1910.146 and require a permit before entering. Read the Safety section at the front of this manual, and the general safety information in Appendix D. 2-2
2150EX Area Velocity Flow System Section 2 Preparation and Installation 2.2.2 Locating the Site The 2150EX is designed to measure flow in open channels with or without a primary device. A primary device is a hydraulic structure, such as a weir or a flume that modifies a channel so there is a known relationship between the liquid level and the flow rate. Although the 2150EX supports flow rate conversion in channels with a primary device, its level and velocity measurement capabilities are best suited for channels without a primary device. Note Primary devices limit the usefulness of the AV Sensor’s readings. In most cases, levels and velocities near these structures do not represent what normally occurs in the channel. If you must use area velocity flow conversion, or if your interest is the stream’s velocity, do not install the AV Sensor near a primary device. Move the AV Sensor away to where the flow is unaffected by the primary device. 2.2.3 Channels Without a Primary Device 2.2.4 Channels With a Primary Device When the AV Sensor is installed without a primary device, find a section of channel with a minimum of disturbances to the flow. Avoid areas with elbows, outfalls, inverts, junctions, etc. that create turbulence near the AV Sensor. The AV Sensor should be located away from these disturbances to a point where the flow has stabilized. For best results, install the AV Sensor where the flow is most uniform. Uniform flow is a condition where the water surface is parallel to the bottom of the channel. If the AV Sensor is installed in a primary device, its location depends on the type of primary device. Most primary devices have a specific place for the head (level) measurement sensor. For more details about the location of the head measuring point, refer to the Isco Open Channel Flow Measurement Handbook, or to information provided by the manufacturer of the primary device. Note When you install the AV Sensor for use within a primary device, a Level-to-Flow conversion method should be used. (See Programming, Section 3.) 2.2.5 2150EX and AV Sensor Mounting Considerations Ideal sites are easily accessible for service and data collection, while still providing protection for the 2150EX module devices. The 2150EX module devices are rated NEMA 4X, 6P, and constructed of materials that can withstand harsh environments. However, continual exposure to UV light, or periodic submersion should be avoided to extend the life of the components. Typically, the 2150EX is suspended inside a manhole. Suspending the 2150EX near the opening will protect it from the elements, minimize the chance of submersion, and allow it to be easily retrieved without entering the manhole. 2-3
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2150EX AV Flow Module - Isco

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