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
Page 1 and 2: 11/07Measuring Gas Velocitywith the
Page 3 and 4: D-FL 100Table of Contents1. Applica
Page 5 and 6: D−FL 100 Seite 11. ApplicationOne
Page 7 and 8: D−FL 100 Seite 3The output signal
Page 9 and 10: D−FL 100 Seite 5To prevent residu
Page 11 and 12: D−FL 100 Seite 73.1. Differential
Page 13: D−FL 100 Seite 9If the differenti
Page 17 and 18: D−FL 100 Seite 13Fig. 11:Installa
Page 19 and 20: D−FL 100 Seite 15Fig. 14:Connecti
Page 21 and 22: D−FL 100 Seite 17Fig. 16:Dimensio
Page 23 and 24: D−FL 100 Seite 19250 mm13538,5 18
Page 25 and 26: D−FL 100 Seite 215.2. Start-up of
Page 27 and 28: D−FL 100 Seite 235.3. Error Messa
Page 29 and 30: D−FL 100 Seite 258. Specification
Page 31 and 32: D−FL 100 Seite 27Fig. 20:Probe cr
Page 33 and 34: D−FL 100 Seite 299. Selecting the
Page 35 and 36: D−FL 100 Seite 319.3. Selecting t
Page 37 and 38: D−FL 100 Seite 33DescriptionHose
Page 39 and 40: D−FL 100 Seite 359.6. Illustratio
Page 41 and 42: D−FL 100 Seite 379.6.3. Mounting,
Page 43 and 44: D−FL 100 Seite 39Customer: XYZ da
Page 45 and 46: D−FL 100 Seite 41If we want to pu
Page 47 and 48: D−FL 100 Seite 4311. Measuring Po
Page 49 and 50: D−FL 100 Seite 45GEMEINSAMESMINIS
Page 51 and 52: D−FL 100 Seite 47EG-Konformitäts
Page 53: D-FL 100 Page 1GmbH · Kollaustraß

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

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