Measuring Gas Velocity with the D-FL 100 Differential Pressure Bar
Measuring Gas Velocity with the D-FL 100 Differential Pressure Bar Measuring Gas Velocity with the D-FL 100 Differential Pressure Bar
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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D−<strong>FL</strong> <strong>100</strong> Seite 114. Installation4.1. Choosing <strong>the</strong> <strong>Measuring</strong> PointThe technical configurations of boilers and smokestacks vary widely. It is advisable to have <strong>the</strong>measuring point determined by <strong>the</strong> local regulatory agency, which later also calibrates <strong>the</strong> emissionmonitoring facility.The measuring point for <strong>the</strong> D-<strong>FL</strong> <strong>100</strong> inside <strong>the</strong> duct/stack must have a fairly constant velocitydistribution and should never drop below <strong>the</strong> dewpoint of <strong>the</strong> gases.The measuring point should not be located close to a bend or a change of diameter in <strong>the</strong> duct. Theinput path (distance before <strong>the</strong> measuring point) and <strong>the</strong> output path (distance behind <strong>the</strong> measuringpoint) should be at least 3D (D=inner diameter of duct/stack). If <strong>the</strong>re is not enough space, <strong>the</strong> inputpath must be longer than <strong>the</strong> output path. D represents <strong>the</strong> diameter of a round stack or <strong>the</strong> hydraulicdiameter of a square or rectangular cross section (Eq. 7).F = areaU = circumference(Eq. 7)If <strong>the</strong> measuring point lies between a filter and a suction fan, <strong>the</strong> installation point should be directedtoward <strong>the</strong> suction fan ra<strong>the</strong>r than <strong>the</strong> filter. Vibrations at <strong>the</strong> mounting point -- often caused by <strong>the</strong>suction fan -- cannot always be avoided. But if, at full load, <strong>the</strong> vibrations become so strong thatmechanical parts or electrical settings are jeopardized, <strong>the</strong> installation should be made separate from<strong>the</strong> 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 <strong>the</strong> <strong>Differential</strong> <strong>Pressure</strong> <strong>Bar</strong>First attach <strong>the</strong> installation flange to <strong>the</strong> duct/stack, <strong>the</strong>n attach <strong>the</strong> differential pressure bar to <strong>the</strong>flange. Please observe <strong>the</strong> following installation guidelines:• Always install <strong>the</strong> differential pressure bar horizontally <strong>with</strong> a slight decline so that condensatescannot flow from <strong>the</strong> differential pressure bar to <strong>the</strong> pressure transducer (Fig. 9).• Provide sufficient space above <strong>the</strong> differential pressure bar for <strong>the</strong> differential pressure transducerand <strong>the</strong> switching valve. If <strong>the</strong> differential pressure transducer will not be installed above <strong>the</strong>differential pressure bar, make sure <strong>the</strong> pipes to <strong>the</strong> transducer are inclined.• Attach <strong>the</strong> differential pressure bar to <strong>the</strong> flange in <strong>the</strong> direction of <strong>the</strong> flow or toward <strong>the</strong> duct/stack,so that <strong>the</strong> openings at one of <strong>the</strong> chambers of <strong>the</strong> differential pressure bar are pointing toward <strong>the</strong>gas flow. The openings at <strong>the</strong> o<strong>the</strong>r chamber are now located on <strong>the</strong> side turned away from <strong>the</strong> flow.Only in this position can a correct differential pressure reading be assured.• Make sure <strong>the</strong> pressure pipes of <strong>the</strong> differential pressure bar are connected to <strong>the</strong> correct side of<strong>the</strong> differential pressure transducer. The flow-side chamber of <strong>the</strong> differential pressure bar must beconnected to <strong>the</strong> positive input of <strong>the</strong> differential pressure transducer, <strong>the</strong> o<strong>the</strong>r chamber <strong>with</strong> <strong>the</strong>negative input. (see also Fig. 12.)GmbH
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