Measuring Gas Velocity with the D-FL 100 Differential Pressure Bar

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D−FL 100 Seite 10LED DisplayStand byIntgL.V.1L.V.2DisplayFunctionunit is in service, zero point testing of differentialpressure transducerintegration time in seconds1st limit value, smaller than L.V.2 in mA (from theoutput current signal)2nd limit value, larger than L.V.1 in mA (from theoutput current signal)shown on display:• volume flow 1000 m3/h• mass flow 1000 kg/h• current output 4-20 mADPHP differential pressure in hPa (mbar)P HP absolut pressure in hPa (mbar), only thethree least significant numbers are displayed,e.g. 1013 hPa is displayed like P013t °C temperature in °CFig. 8:Front cover of D-FL 100-10 DisplayGmbH
D−FL 100 Seite 114. Installation4.1. Choosing the Measuring PointThe technical configurations of boilers and smokestacks vary widely. It is advisable to have themeasuring point determined by the local regulatory agency, which later also calibrates the emissionmonitoring facility.The measuring point for the D-FL 100 inside the duct/stack must have a fairly constant velocitydistribution and should never drop below the dewpoint of the gases.The measuring point should not be located close to a bend or a change of diameter in the duct. Theinput path (distance before the measuring point) and the output path (distance behind the measuringpoint) should be at least 3D (D=inner diameter of duct/stack). If there is not enough space, the inputpath must be longer than the output path. D represents the diameter of a round stack or the hydraulicdiameter of a square or rectangular cross section (Eq. 7).F = areaU = circumference(Eq. 7)If the measuring point lies between a filter and a suction fan, the installation point should be directedtoward the suction fan rather than the filter. Vibrations at the mounting point -- often caused by thesuction fan -- cannot always be avoided. But if, at full load, the vibrations become so strong thatmechanical parts or electrical settings are jeopardized, the installation should be made separate fromthe vibrating suction fan.The measuring point must be safely accessible not only during start-up or calibration, but also for latermaintenance and service.4.2. Installing the Differential Pressure BarFirst attach the installation flange to the duct/stack, then attach the differential pressure bar to theflange. Please observe the following installation guidelines:• Always install the differential pressure bar horizontally with a slight decline so that condensatescannot flow from the differential pressure bar to the pressure transducer (Fig. 9).• Provide sufficient space above the differential pressure bar for the differential pressure transducerand the switching valve. If the differential pressure transducer will not be installed above thedifferential pressure bar, make sure the pipes to the transducer are inclined.• Attach the differential pressure bar to the flange in the direction of the flow or toward the duct/stack,so that the openings at one of the chambers of the differential pressure bar are pointing toward thegas flow. The openings at the other chamber are now located on the side turned away from the flow.Only in this position can a correct differential pressure reading be assured.• Make sure the pressure pipes of the differential pressure bar are connected to the correct side ofthe differential pressure transducer. The flow-side chamber of the differential pressure bar must beconnected to the positive input of the differential pressure transducer, the other chamber with thenegative input. (see also Fig. 12.)GmbH
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Page 4 and 5: D-FL 100IllustrationsFig. 1: Diagra
Page 6 and 7: D−FL 100 Seite 2Fig. 1:Diagram of
Page 8 and 9: D−FL 100 Seite 4placed on the dif
Page 10 and 11: D−FL 100 Seite 63. System Compone
Page 12 and 13: D−FL 100 Seite 83.2. Differential
Page 16 and 17: D−FL 100 Seite 12After the differ
Page 18 and 19: D−FL 100 Seite 144.3. Electrical
Page 20 and 21: D−FL 100 Seite 16Fig. 15:Connecti
Page 22 and 23: D−FL 100 Seite 18Fig. 17:Connecti
Page 24 and 25: D−FL 100 Seite 205. Start-Up / Er
Page 26 and 27: D−FL 100 Seite 22LED readout inst
Page 28 and 29: D−FL 100 Seite 247. MaintenanceTh
Page 30 and 31: D−FL 100 Seite 26Differential Pre
Page 32 and 33: D−FL 100 Seite 28Installation fla
Page 34 and 35: D−FL 100 Seite 30Inner diameter(m
Page 36 and 37: D−FL 100 Seite 329.5. Ordering In
Page 38 and 39: D−FL 100 Seite 34** Other materia
Page 40 and 41: D−FL 100 Seite 369.6.2. Variant e
Page 42 and 43: D−FL 100 Seite 3810. Calculation
Page 44 and 45: D−FL 100 Seite 4010.1. Explanatio
Page 46 and 47: D−FL 100 Seite 420C ° = b · 4mA
Page 48 and 49: D−FL 100 Seite 44GmbH
Page 50 and 51: D−FL 100 Seite 46II.Eignung von M
Page 52 and 53: D−FL 100 Seite 48DURAG GROUP comp

Measuring Gas Velocity with the D-FL 100 Differential Pressure Bar

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