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AIR MOVEMENT Airflow Measuring Station AND …

FAN-EvaluatorAirflow Measuring StationAIRMOVEMENTAND CONTROLASSOCIATIONINTERNATIONAL, INC. AIRFLOWMEASUREMENTSTATIONAIRPERFORMANCE amcaCERTIFIEDRATInGSAccurate Airflow measurement for demanding applicationsThe FAN-E is a multi-point, self-averaging Pitot traverse stationwith integral air straightener-equalizer honeycomb cell, capable ofcontinuously Measuring fan discharges or ducted Airflow with anaccuracy of 2% or better. The FAN-E derives its high degree ofmeasurement accuracy from a combination of precision sensorlocations, honeycomb Airflow processing, pneumatic averaging ofa large number of sensed Airflow pressures, and patented"symmetrical averaging" (Patent No.)

FAN-Evaluator Airflow Measuring Station AIR MOVEMENT AND CONTROL ASSOCIATION INTERNATIONAL, INC. ® AIRFLOW MEASUREMENT STATION AIR PERFORMANCE amca CERTIFIED RATInGS Accurate airflow measurement for demanding applications

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Transcription of AIR MOVEMENT Airflow Measuring Station AND …

1 FAN-EvaluatorAirflow Measuring StationAIRMOVEMENTAND CONTROLASSOCIATIONINTERNATIONAL, INC. AIRFLOWMEASUREMENTSTATIONAIRPERFORMANCE amcaCERTIFIEDRATInGSAccurate Airflow measurement for demanding applicationsThe FAN-E is a multi-point, self-averaging Pitot traverse stationwith integral air straightener-equalizer honeycomb cell, capable ofcontinuously Measuring fan discharges or ducted Airflow with anaccuracy of 2% or better. The FAN-E derives its high degree ofmeasurement accuracy from a combination of precision sensorlocations, honeycomb Airflow processing, pneumatic averaging ofa large number of sensed Airflow pressures, and patented"symmetrical averaging" (Patent No.)

2 3,685,355), which requiresthat all stages in the averaging process occur at a point where thereis a balanced array of sensors present, thereby assuring that eachsensed pressure is given the same "equal weight" in the averagingprocess as other sensed DescriptionFAN-EvaluatorHow It WorksLog-Tchebycheff Sensor Location. A high concentration of totaland static pressure sensors positioned according to the log-Tchebycheff rule sense the multiple and varying flow componentsthat constitute the airstream's velocity profile. The log-Tchebycheff'sperimeter weighted sensor pattern is utilized to minimize the positiveerror (measurements greater than actual) caused by the failure toaccount for slower velocities at the duct wall when using traditionalequal area sensor locations.

3 Spacing of total pressure sensors is perASHRAE 1993 Fundamentals Handbook which is summarizedbelow. Since the static pressure across the Station is relativelyuniform, a lesser number of static pressure sensors are utilized tominimize unrecovered pressure / StationConfigurationASHRAE 1993 Fundamentals Handbook Rectangular25 or more points, maximum 6" or 8" apart, depending on duct size. Circular12 to 30 points, along 2 or 3 Pitot Flow Measurement. The FAN-E operates on theFechheimer Pitot derivative of the multi-point, self-averaging Pitotprinciple to measure the total and static pressure components ofairflow.

4 Total pressure sensing ports with patented ( PatentNo. 4,559,835) chamfered entrances, and Fechheimer pairs of offsetstatic pressure sensing ports combine to minimize the effect ofdirectional Airflow . When located downstream of honeycomb airflowprocessing cell, the Fechheimer Pitot method is extremely effectiveat accurately Measuring Airflow in limited straight duct Processing. To assure extremely high levels of measuringaccuracy (2% of actual flow or better) under extreme conditionscaused by turbulent, rotating, and multi-directional airflows normallypresent near fan inlets or discharge ducts and directly downstreamfrom duct elbows, transitions, etc.

5 , the FAN-E uses open, parallelcell, honeycomb panels to "process" the air into straightened flowjust prior to the total pressure measurement plane. These honeycombpanels sharply reduce the need for long, straight runs of duct beforeand after the Station to obtain accurate flow Airflow Resistance. The FAN-E Airflow measuringstation is designed to function while producing a minimum ofresistance to Airflow , due to the unique honeycomb air straightener-equalizer section having a free area of The unique, non-restrictive characteristic of the FAN-E is seen in the Resistance Velocity graph below.

6 The values indicated are totalresistance and do not include any allowances for static regain (apotential 20% reduction to the values).2% Certified Measurement AccuracyAir Monitor Corporation certifies that theFAN-Evaluator Airflow Measuring Stationshown herein is licensed to bear the AMCAC ertified Ratings Seal Airflow MeasurementStation Performance. The ratings shown arebased on tests and procedures performed inaccordance with AMCA Publication 611 andcomply with the requirements of the AMCAC ertified Ratings ratings include the effect of anintegral air equalizer-straightener cell in and FAN- PressureConversion = 1096 AMS Velocity PressureAir DensitySizes & Shapes " x 36" Rectangular; 36" dia.

7 CircularApplicable Sizes stations with cross-sectionalareas between and square stations with cross-sectional areasbetween and square Standard 610, Figure 1 Test Results Rectangular StationsAirflowReferenceReference%Resist ance Volume, ACFMV elocity, AFPMA ccuracy IN ,8383, ,6893, ,6162, ,4002, ,4341, , Results Circular StationsAirflowReferenceReference%Resist ance Volume, ACFMV elocity, AFPMA ccuracy IN ,1414, ,2753,434 ,1762,854 ,5502,058 ,2151, ,6721, CONTROLASSOCIATIONINTERNATIONAL, INC. AIRFLOWMEASUREMENTSTATIONAIRPERFORMANCE amcaCERTIFIEDRATInGSConstruction FeaturesAirf low Measuring Station90 Connection FlangesTotal and Static Pressure Signal Connection FittingsWelded 14 Casing8" Depth (10" for Beaded)Offset FechheimerStatic Pressure SensorsCopper Total PressureSensing ManifoldSpecificationsAir Equalizer Straightener resistant 3003 aluminum.

8 3" deep x 1/2" Pressure tubing assembled with 50/50 tin/lead mounting and support Pressure Header and tubing. Galvanized mounting " brass compression type located on the long dimension ofrectangular and flat oval and Flanges: Aluminum, Carbon Steel, Stainless Steel,PVC and Fiberglass, Hastelloy, Equalizer Straightener Cell: Type 304 and 316 StainlessSteel, Carbon Steel, PVC, and Static Pressure Manifolds: Type 316 Stainless Steel,Hastelloy, Inconel, PVC, Fittings: Stainless Steel, Hastelloy, the Factory for special construction stations using theabove listed and other , Circular, and Flat of actual operation to 300 14 gauge galvanized sheet metal, intermittentwelded casing sealed with metal and Flat Oval.

9 18 gauge galvanized sheet metal, spotwelded casing " deep for stations with 90 " deep, 8" from bead-to-bead for stations with beaded 1-1/2" wide, 90 formed. Sizes up to 144" x 144".Circular and Flat 10" to 24".1" wide flanges, or beaded > 24" and < 45".1-1/2" wide > 45".3/16" x 2" bar stock Honeycomb Air StraightenerCopper Total PressureCentral Averaging ManifoldNote: FAN-E locations shown are not ideal. The locations indicate the minimum clearance required from air turbulence producing possible, the FAN-E should be installed where greater runs of straight duct (or clearances) than shown below Installation Requirements125-030 (May 2011)Web (10/13)FAN-Evaluator Rectangular Duct: x = Circular Duct: x = Duct Diameter2 H x WH + WThe Airflow Measuring Station (s) shall be fabricated of a minimumof 14 ga.

10 Galvanized steel, welded casing in 8" depth with 90 connecting flanges in a configuration and size equal to that ofthe duct it is mounted into. Each Station shall be complete withan open parallel cell air straightener-equalizer honeycombmechanically fastened to the casing, and external signalconnection fittings. An identification label shall be placed oneach Station casing listing the model number, size, area, andspecified Airflow shall be AMCA certified and be capable of measuringthe Airflow rates within an accuracy of 2%. The maximumallowable unrecovered pressure drop caused by the stationshall not exceed.


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