Sierra Series 830/840/860 Side-Trak™ and ... - Sierra Instruments

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Series 830/840/860 Instruction ManualChapter 1 IntroductionSafety InformationCaution and warning statements are used throughout this book todraw your attention to important information.Warning!This statement appears with information thatis important to protect people and equipmentfrom damage. Pay very close attention to allwarnings that apply to your application.Caution!This statement appears with information that isimportant for protecting your equipment andperformance. Read and follow all cautions thatapply to your application.Receipt of System ComponentsWhen receiving a Sierra transducer, carefully check the outsidepacking carton for damage incurred in shipment. If the carton isdamaged, notify the local carrier and submit a report to the factoryor distributor. Remove the packing slip and check that all orderedcomponents are present and match your specifications (as ordered).Make sure any spare parts or accessories are not discarded with thepacking material. Do not return any equipment to the factory withoutfirst contacting Sierra Customer Service.Technical AssistanceIf you encounter a problem with your transducer, review theconfiguration information for each step of the installation, operationand set up procedures. Verify that your settings and adjustments areconsistent with factory recommendations. Refer to Chapter 5, Troubleshooting,for specific information and recommendations.If the problem persists after following the troubleshooting proceduresoutlined in Chapter 5, contact Sierra Instruments by fax or byE-mail (see inside front cover). For urgent phone support you maycall (800) 866-0200 or (831) 373-0200 between 8:00 a.m. and 5:00p.m. PST. In Europe contact Sierra Instruments bv at +31 206145810. When contacting Technical Support, make sure to includethis information:• the flow range, serial number and Sierra ordernumber and model number (all marked on thetransducer nameplate)• the problem you are encountering and any correctiveaction taken• application information (gas, pressure, temperatureand piping configuration)IM-83/84/86-H 1-3
Chapter 1 IntroductionSeries 830/840/860 Instruction ManualThe Series 800 Flow Sensing PrincipleThe operating principle of Sierra’s Side-Trak and Auto-Trak flowmeters and controllers is based on heat transfer and the first law ofthermodynamics. During operation process gas enters the instrument’sflow body and divides into two flow paths, one through thesensor tube, the other through the laminar flow element bypass.The laminar flow element bypass generates a pressure drop, P 1 –P 2 ,forcing a small fraction of the total flow to pass through the sensortube (m 1 ) which is then monitored.Figure 1-1. Flow Paths through the TransducerTwo resistance temperature detector (RTD) coils around the sensortube direct a constant amount of heat (H) into the gas stream. In actualoperation, the gas mass flow carries heat from the upstreamcoil to the downstream coil. The resulting temperature difference(∆T) is detected by the RTD coils.Figure 1-2. Flow Measuring Principle1-4 IM-83/84/86-H
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Sierra Series 830/840/860 Side-Trak™ and ... - Sierra Instruments

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