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Chapter 6: Flow Measurements Using the Capture Hood

57

Note

It is important that the capture hood see the same flow for both parts of the backpressure
compensated flow measurement. It is best to keep the Capture Hood in place for both
measurements, but it is alright to remove and replace the Capture Hood between the two
readings. However, if the flow is changed or changing between the two measurements, the
measurement results will be inaccurate.

―ERROR‖ Display

For the backpressure compensation measurement to be meaningful, the measurement in the flap “

OPEN

”

position must be higher than the measurement in the flap “

CLOSED

” position. If this is not true, the

A

CCU

B

ALANCE

meter will display an error: backpressure open greater than closed.

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Содержание 8380 ACCUBALANCE

Страница 1: ...nometer and Model 8380 ACCUBALANCE Modular Air Balancing Tool Operation and Service Manual Model 8380 ACCUBALANCE Model 8715 DP CALC Micromanometer Modular Air Balancing Tool shown with standard and optional accessories ENERGY AND COMFORT www netzerotools com ...

Страница 2: ...OF FITNESS FOR PARTICULAR PURPOSE OR MERCHANTABILITY IS MADE WITH RESPECT TO SELLER S BREACH OF THE IMPLIED WARRANTY AGAINST INFRINGEMENT SAID WARRANTY IS LIMITED TO CLAIMS OF DIRECT INFRINGEMENT AND EXCLUDES CLAIMS OF CONTRIBUTORY OR INDUCED INFRINGEMENTS BUYER S EXCLUSIVE REMEDY SHALL BE THE RETURN OF THE PURCHASE PRICE DISCOUNTED FOR REASONABLE WEAR AND TEAR OR AT SELLER S OPTION REPLACEMENT OF...

Страница 3: ...ssure Port to the Micromanometer 12 Attaching the Micromanometer to the Capture Hood Base 12 Connecting the Velocity Matrix to the Micromanometer 13 Connecting the Air Flow Probe to the Micromanometer 14 Connecting the Base Temperature Probe Temperature and Humidity Probe or Thermoanemometer Probe to the Micromanometer 15 Using the Telescoping Thermoanemometer Probes or Temperature and Humidity Pr...

Страница 4: ... Capture Hood Measurements non backpressure compensated 56 Backpressure Compensated Measurements 56 ERROR Display 57 Chapter 7 Maintenance and Troubleshooting 59 Fabric Hood 59 Micromanometer 59 Manifold 59 Cases 59 Calibration 59 Appendix A Back Pressure 61 Verifying Flow Measurements 61 Appendix B Traversing a Duct to Determine Average Air Velocity or Volume 63 Where to Take the Measurement 63 T...

Страница 5: ...ypography Step by step instructions are numbered in boldface type 1 2 3 etc set flush left against the margin References to keys on the micromanometer and the instrument s displayed readout are represented by a typeface called Arial In addition to the different typeface displayed messages appear in quotes When reference is made to other sections of the manual the section title is italicized www ne...

Страница 6: ...s Industrial hygienists Plant engineers and facilities maintenance personnel Applications include Test balance or commission HVAC systems Test clean rooms and biological safety cabinets Measure fume hood or filter face velocity Measure pressure temperature relative humidity air velocity or air flow C A U T I O N WHILE USING THE ACCUBALANCE AIR BALANCING INSTRUMENT TO TEST AIR FLOW IN DUCTS YOU MAY...

Страница 7: ...rovide brief descriptions of the micromanometer and the various standard and optional tools for use with the micromanometer Refer to Chapters 3 and 4 for more detailed information on using the micromanometer and taking measurements with various sensors and probes Micromanometer Figures 1 and 2 show the features of the micromanometer used in the Model 8715 8380 Keypad AC Adapter Connection Display ...

Страница 8: ...ure 4 Features of the Model 8380 Base Inside View Micromanometer The micromanometer is a multifunction instrument used to measure air velocity air flow absolute and differential pressure temperature and humidity measurements when used with the tools listed below The lightweight micromanometer incorporates auto zeroing for high accuracy low pressure measurements Measurements can be stored to memory...

Страница 9: ...vailable in a kit with one 2 ft 2 ft 610 mm 610 mm fabric hood frame and base assembly Alternate hood sizes are available Descriptions and part numbers can be found in Table 2 of Chapter 2 of this manual Optional Tools This section gives a brief description of optional tools for the micromanometer Velocity Matrix The velocity matrix is used to obtain area averaged multi point air velocity measurem...

Страница 10: ...ems Four models are available in straight or articulating construction and with or without a relative humidity sensor Models with a relative humidity sensor can also calculate wet bulb and dewpoint temperature Thermoanemometer Probes Model Description 960 Air Velocity and Temperature Straight Probe 962 Air Velocity and Temperature Articulating Probe 964 Air Velocity Temperature and Humidity Straig...

Страница 11: ...attery holders for four AA batteries 1801157 AC adapter 2182003 CONN AC EURO IEC320 1302014 CONN AC AUST IEC320 1302025 CONN AC UK IEC320 1302015 Carry strap tether 2913011 18 46 cm pitot probe 534534001 Two static pressure probes 3002017 16 ft 4 8 m Neoprene tubing 3900031 Swirl X Flow Conditioner 801213 LogDat CH software N A USB cable 1303754 Operation and Service Manual 6005725 Calibration cer...

Страница 12: ...lease complete the registration card included with this product and mail it promptly The card allows us to inform you of product updates If you prefer register through the Preparing the Instrument for Use Before you can use the Modular Balancing Tool you must decide on a power source Power the Micromanometer with the AC Adapter The AC adapter can be used to power the instrument or to charge the Ni...

Страница 13: ...osen it and then pulling the battery holder free 4 Refer to Figure 6 and set the battery selection switch to indicate the type of batteries you are using Battery Selection Switch Figure 6 Location of Battery Type Selector Switch 5 Reinstall the battery holder and replace the battery compartment cover To install replacement batteries 1 Turn the unit off and locate the battery cover on the back of t...

Страница 14: ...icator may show a lower value even when they are fully charged Caution The percent power remaining will not be accurate for NiMH batteries because their voltage does not decrease linearly with power use Due to the danger of battery leakage remove batteries from the battery compartment before storage Never mix battery types The NiMH batteries should only be charged at room temperature Starting with...

Страница 15: ...locity needs a valid temperature to perform the standard or actual velocity correction This is accomplished in the Actual Std Setup menu If no probe capable of measuring temperature plug in probe is connected the Temp Source must be set to Entered The duct air temperature must then be manually inputted by the user using the Entered Temp setting If the Temp Source is set to Probe and no probe is co...

Страница 16: ... 1 Tilt the meter forward and align the tabs in the base of the meter with the two matching slots in the bottom of the recessed area at the front of the base see Figure 10 2 When the tabs are engaged in the slots press firmly on the face of the meter above the display until the tab in the top center of the meter clicks into the bent metal retaining clip in the base 3 Attach the temperature cable a...

Страница 17: ...e assembly is attached to the downstream or negative side in the center of the velocity matrix see Figure 11 Positive Port Standoffs Negative Port Handle Figure 11 Velocity Matrix Note The Velocity Matrix needs a valid temperature to perform the standard or actual velocity correction This is accomplished in the Actual Std Setup menu If no probe capable of measuring temperature plug in probe is con...

Страница 18: ...ator on the Air Flow Probe straight pitot probe when taking air velocity or air volume measurements Total Pressure Port Static Pressure Port Figure 12 Air Flow Probe Note The pitot velocity needs a valid temperature to perform the standard or actual velocity correction This is accomplished in the Actual Std Setup menu If no probe capable of measuring temperature plug in probe is connected the Temp...

Страница 19: ...rature and Humidity Probe The telescoping thermoanemometer probe contains the velocity temperature and humidity sensors When using the probe make sure the sensor window is fully exposed and the orientation dimple is facing upstream The telescopic temperature and humidity probe contains the temperature and humidity sensors This probe is ideally suited for in duct measurements and provides calculati...

Страница 20: ...e Probe To retract the probe hold the handle in one hand while gently pulling the probe cable until the smallest antenna section is retracted C A U T I O N Do not use the instrument or probes near hazardous voltage sources since serious injury could result www netzerotools com www netzerotools com ...

Страница 21: ...Functions Keypad Function Description ON OFF I O Key Press I O to turn the meter on and off During the power up sequence the display will show the following Model Number Serial Number and Software Revision To turn the instrument off press and hold the I O Key for 3 seconds The instrument will count down OFF2 OFF1 OFF If the AC Adapter is attached the Battery and I O Key is bypassed If the I O Key ...

Страница 22: ...aximum and number of samples of data stored in the current Test ID MENU Press the Menu key to access the Menu selections which are Pressure Tool Display Setup Flow Setup Actual Std Setup Data Logging Bluetooth Functions Applications Cf Selection and Calibration Common Terms In this manual there are several terms that are used in different places The following is a brief explanation of the meanings...

Страница 23: ...d with Cont Key RunAvg and Cont time RunAvg logging modes Test Length This is the time over which the data will be logged in the Continuous Time mode of data logging Sum The sum of all samples in a Test ID SUM is only available for Capture Hood or Diffuser Flow flow from pressure and K factor Minimum The sample with lowest value in the Test ID Maximum The sample with highest value in the Test ID A...

Страница 24: ...alibration PRESSURE TOOL Capture Hood Pressure Only Pitot tube AF Probe Velocity Matrix Pressure K factor None Capture Hood For measuring flow from grilles and diffusers Pressure Only For measuring static or differential pressures Pitot Tube Flow and velocity measurements inside ductwork AF Air Flow Probe Straight Pitot Probe Flow and velocity measurements inside ductwork Can also be used for face...

Страница 25: ...ts Air Flow Probe Velocity Air Flow Probe Flow ft min m s l s m3 hr m3 s CFM with velocity units Velocity Matrix ft min m s Pressure units with K factor and flow units Diffuser Flow l s m3 hr m3 s CFM Note When the micromanometer is mounted on the base for use as a capture hood and the headphone jack is connected the unit will automatically default the Pressure Tool to Capture Hood mode The option...

Страница 26: ...yed as a secondary parameter up to 4 can be displayed When set to OFF measurement will not be displayed MENU Pressure Tool Display Setup Flow Setup Actual Std Setup Settings Data Logging Bluetooth Functions Applications Cf Selection Calibration DISPLAY SETUP Pressure ON Baro Pressure OFF Velocity Pitot ON Flow Pitot round duct ON OFF PRIMARY Display Setup Screen with Pitot Tube Selected as Pressur...

Страница 27: ...nd duct Rectduct Ductarea ENTER SETTINGS 12 0 in dia Flow Setup Pressure K factor When the Pressure Tool is set to Flow K factor up to four 4 user adjustable K factors can be defined within the Flow Setup menu Use the arrow keys to select a Kfactor or to make changes and press the key to accept MENU Pressure Tool Pressure K factor Display Setup Flow Setup Actual Std Setup Settings Data Logging Blu...

Страница 28: ...h Functions Applications Cf Selection Calibration ACTUAL STD SETUP Setting Standard Temp Source Entered PREVIOUS NEXT SETTING Standard Actual TEMP SOURCE Entered Temp 70 0 F Probe The pressure based probes pitot tube AF probe and Velocity Matrix need a valid temperature to perform the standard or actual velocity or volume flow corrections This is accomplished in the Actual Std Setup menu If no pro...

Страница 29: ...Number Format XX XXX YY Backlight Auto Auto Off Enable RS232 Baud Rate 9600 Deadband Enable Headphone Input Enable RS232 Baud Rate Sets the speed a computer will accept information Deadband The deadband determines the velocity or volume measurement threshold for displaying 0 If the deadband is Enabled readings below 18 fpm 0 0914 m s or 18 cfm 30 58 m3 h 8 49 l s will be displayed as 0 If the dead...

Страница 30: ...REMENTS Pressure ON Baro Pressure OFF Velocity Pitot DISPLAY Flow Pitot round duct DISPLAY DISPLAY ON Log Mode Display Mode The instrument can be programmed to store measurements to memory in several different logging formats Log Mode Display Mode Display Data Logging Recommended Usage Manual Single Single measurement Single sample initiated and manually saved by user Pressure Tools Manual RunAvg ...

Страница 31: ...g can be saved by pressing the SAVE or key The reading can be discarded by pressing ESC Pressing READ will discard the current measurement and the meter will start taking a new sample Manual RunAvg In the Manual RunAvg mode the current reading is displayed at all times as an averaged reading Pressing READ or the RED switch on the base will freeze the current sample measurement o Press SAVE to save...

Страница 32: ...gs Choose Test Test 001 Name Test View Data Delete Data Memory LOG MODE DISPLAY MODE Manual Single Manual RunAvg Auto Save RunAvg Cont Key RunAvg Cont Time RunAvg When set to Auto Save RunAvg the Sample Time can be adjusted Sample Time is the time period over which the Sample will be averaged Use the arrow keys to make changes and press to accept MENU Pressure Tool Display Setup Flow Setup Actual ...

Страница 33: ...e Display Mode Manual RunAvg Log Settings Choose Test Test 001 Name Test View Data Delete Data Memory LOG MODE DISPLAY MODE Manual Single Manual RunAvg Auto Save RunAvg Cont Key RunAvg Cont Time RunAvg When set to Cont key the log interval can be adjusted Use the arrow keys to make changes and press to accept MENU Pressure Tool Display Setup Flow Setup Actual Std Setup Settings Data Logging Blueto...

Страница 34: ...est Test 001 Name Test View Data Delete Data Memory LOG MODE DISPLAY MODE Manual Single Manual RunAvg Auto Save RunAvg Cont Key RunAvg Cont Time RunAvg When set to Cont time the log interval and test length can be adjusted MENU Pressure Tool Display Setup Flow Setup Actual Std Setup Settings Data Logging Bluetooth Functions Applications Cf Selection Calibration DATA LOGGING Measurements Log Mode D...

Страница 35: ...de Display Mode Manual RunAvg Log Settings Choose Test Test 001 Name Test View Data Delete Data Memory CHOOSE TEST Test 001 9 Samples Test 002 7 Samples Test 003 20 Samples Test 004 15 Samples Test 005 38 Samples Test 006 12 Samples Test 007 0 Samples NEW DATES Name Test This option allows for customizing the Test ID name using eight 8 characters maximum Use the arrow keys to move the cursor to a ...

Страница 36: ...es date and time the samples were taken MENU Pressure Tool Display Setup Flow Setup Actual Std Setup Settings Data Logging Bluetooth Functions Applications Cf Selection Calibration DATA LOGGING Measurements Log Mode Display Mode Manual RunAvg Log Settings Choose Test Test 001 Name Test View Data Delete Data Memory VIEW DATA Choose Test Test 022 View Stats View Samples Print Test Use the and arrow ...

Страница 37: ...rinter or PC capable of Bluetooth communications To use the PRINT key Bluetooth communications must be established between the meter and the Model 8934 wireless printer or PC set up with Bluetooth communications Print Test Press to print all statistics and samples for the selected Test ID MENU Pressure Tool Display Setup Flow Setup Actual Std Setup Settings Data Logging Bluetooth Functions Applica...

Страница 38: ...st Test 022 Name Test View Data Delete Data Memory DELETE DATA Delete All Delete Test Delete Sample Delete All will clear stored data in all Test IDs MENU Pressure Tool Display Setup Flow Setup Actual Std Setup Settings Data Logging Bluetooth Functions Applications Cf Selection Calibration DATA LOGGING Measurements Log Mode Display Mode Manual RunAvg Log Settings Choose Test Test 022 Name Test Vie...

Страница 39: ...est 005 7 Samples Test 006 15 Samples Test 007 15 Samples DATES DELETE TEST Delete Test 005 Are you sure NO YES Delete Sample will clear the last sample in an individual Test ID selected by the user MENU Pressure Tool Display Setup Flow Setup Actual Std Setup Settings Data Logging Bluetooth Functions Applications Cf Selection Calibration DATA LOGGING Measurements Log Mode Display Mode Manual RunAv...

Страница 40: ...evices MENU Pressure Tool Display Setup Flow Setup Actual Std Setup Settings Data Logging Bluetooth Functions Applications Cf Selection Calibration BLUETOOTH FUNCT Discover Devices Discoverability Enable PINcode 0000 AutoConnects 1 Discover Devices Start the Bluetooth process of finding other devices from the meter Discoverability Describes whether another device can discover the meter Options inc...

Страница 41: ... by making temperature humidity and flow measurements upstream and downstream of the coil in the duct Requires thermoanemometer probe 964 or 966 See Application Note TSI 124 for more information Turbulence Intensity turbulence intensity is a scale characterizing turbulence expressed as a percent Requires thermoanemometer probe 960 962 964 or 966 See Application Note TSI 141 for more information Lo...

Страница 42: ...o discard and repeat measurement When Sample is saved meter will prompt user to move probe to the next sample point If LogMode DisplayMode is set to Manual RunAvg Meter will continuously display a reading User can press SAVE at any time o Meter will store sample and prompt user to move probe to the next sample point If LogMode DisplayMode is set to AutoSave RunAvg Meter will continuously display a...

Страница 43: ...Select pre programmed Cfactor Cf factor Status ON Selected Cfactor will be applied to measurment OFF Selected Cfactor will not be applied to measurment Depending on what is selected as the Pressure Tool will determine what measurement tool is displayed on the Cf Selection screen Note Calibration factors are not available for the Pressure Only or Flow K factor tools Calibration The Calibration Menu...

Страница 44: ...d LogDat CH LogDat CH software transfers the stored data from the meter to a computer as a spreadsheet file This software is useful for applications such as duct traverses fume hood and filter face velocity testing Follow the instructions on the label of the LogDat CH software to install the software on your computer The software is shipped on a CD ROM and includes a User s Guide and Installation ...

Страница 45: ...ture Hood is shipped from the factory partially assembled with the 2 ft 2 ft 610 mm 610 mm nylon hood attached to the base If you wish to use another hood size see Changing Capture Hoods To complete the assembly of the 2 ft 2 ft 610 mm 610 mm hood follow these six steps 1 Place the base of the capture hood on the floor 2 Lift the top of the fabric Insert one end of a support pole into its pole mou...

Страница 46: ...num frame Finally fold up the fabric you just removed so that it can fit into one of the accessory pockets inside the carrying case It is a good idea to fold the fabric so that the tag identifying its size remains visible for future reference Alternate Hood Installation Refer to Figures 17 through 20 to determine the frame channels needed to assemble any of the standard sized frames Select the pie...

Страница 47: ... mm 1220 mm hood and frame The support poles always cross as pairs at the front and back of the fabric hood For the 1 ft 4 ft 305 mm 1220 mm the support poles are inserted into the outside ferrule locations 2 1 3 1 2 3 www netzerotools com www netzerotools com ...

Страница 48: ... the front and back of the fabric hood For the 2 ft 4 ft 610 mm 1220 mm the support poles are inserted into the inside ferrule locations The number 1 and 5 channels also have a wing nut at the straight end which will mate with an angle and studs on the ends of numbers 2 5 and 6 to form the longer frame sides see Figure 19 2 1 4 1 2 4 www netzerotools com www netzerotools com ...

Страница 49: ...mm 1525 mm hood and frame The support poles always cross as pairs at the front and back of the fabric hood For the 1 ft 5 ft 305 mm 1525 mm the support poles are inserted into the inside ferrule locations 2 1 3 1 2 3 5 5 www netzerotools com www netzerotools com ...

Страница 50: ... ft 915 mm 915 mm hood and frame The support poles always cross as pairs at the front and back of the fabric hood For the 3 ft 3 ft 915 mm 915 mm the support poles are inserted into the outside ferrule locations Figure 21 Frame Corner Assembly 1 6 6 1 6 1 6 1 www netzerotools com www netzerotools com ...

Страница 51: ...nd then to the base unit By stretching around the frame corners the cord is slightly reduced in diameter and is easier to press into the frame channel Note The hood corners should always be aligned with the corners of the base near the hood support brackets The base has rivets located in the corners which can be used as a guide for aligning the hood corners Direct Inflow Measurement Hood for Biolo...

Страница 52: ...position when mounted to a biological safety cabinet or lab hood Figure 24 Direct Inflow Measurement Hood Components To complete the assembly of the BSC hood follow these seven steps 1 Remove the plug located at the back of the base assembly and insert the Philips screw with washer into the hole from the inside of the base see Figure 25 Place the threaded insert on the outside of the base opposite...

Страница 53: ... attached to the U channel of the frame see Figure 26 Use the different flap lengths to fit various cabinet widths Figure 26 Attach Fabric Hood and Hood Support Poles to Frame and Base Assembly 4 Mount the capture hood base to the telescopic stand by fastening the screw on the telescopic stand to the threaded insert mounted on the base opposite the display manometer see Figure 27 Figure 27 Mount H...

Страница 54: ...ood frame rests against the cabinet opening and the capture hood is horizontal to the cabinet see Figure 28 Figure 28 Adjust Height and Position of Telescopic Stand 6 Lower the sash of the cabinet until it rests on the foam lip of the hood frame see Figure 29 Figure 29 Lower Sash of Cabinet Until it Rests on Foam Lip of Hood Frame www netzerotools com www netzerotools com ...

Страница 55: ...cover the opening of the cabinet Tape the edges of the flaps to the sash and frame of the cabinet to create a tight fit The unit is now ready to make measurements see Figure 30 Figure 30 Unit Ready to Make Measurements www netzerotools com www netzerotools com ...

Страница 56: ...U MAY COME INTO CONTACT WITH OR BE EXPOSED TO DUST POLLEN MOLD FUNGUS OR OTHER AIRBORNE CONTAMINANTS IF YOU ARE OR MAY BE SENSITIVE TO DUST POLLEN MOLD FUNGUS OR OTHER AIRBORNE CONTAMINANTS ALWAYS USE AN APPROPRIATE MASK OR RESPIRATOR WHILE EMPLOYING THE ACCUBALANCE AIR BALANCING INSTRUMENT Single Reading Measurements Single reading measurements are individual flow measurements initiated by pressi...

Страница 57: ...t results especially when the flow is greater than 500 ft3 min 850 m3 hr 235 l s Make sure that Capture Hood Back with Pressure Compensation is selected from the Pressure Tools menu Backpressure compensated measurement require two sequential measurements first with the back pressure flap OPEN and then with the flap CLOSED Follow the sequence of operation as described below 1 Place the Capture Hood...

Страница 58: ...e the Capture Hood between the two readings However if the flow is changed or changing between the two measurements the measurement results will be inaccurate ERROR Display For the backpressure compensation measurement to be meaningful the measurement in the flap OPEN position must be higher than the measurement in the flap CLOSED position If this is not true the ACCUBALANCE meter will display an ...

Страница 59: ... the flow sensing taps of the manifold becoming clogged with dust or other material clean them with a damp cloth The manifold should be kept in place during cleaning Do not apply excessive forces on the grid of the manifold If any part of the grid is damaged please contact Customer Service for repair information Cases If the instrument case or storage case needs cleaning wipe it off with a soft cl...

Страница 60: ... Clean the battery contacts Plug in AC adapter flashing on display Low battery charge Dirty battery contacts Replace or recharge the batteries Clean the battery contacts 888888 flashing on display The pressure is too high to measure This same display is shown if measuring velocity or flow and the pressure at that velocity is too high The maximum pressure is shown on the specifications page will ap...

Страница 61: ... pressure flap OPEN and the second with the flap CLOSED The resulting Backpressure Compensated Flow displayed by the meter represents the air flow through the diffuser grille in its original state that is without the presence of the capture hood Verifying Flow Measurements It is always the recommended practice to verify the flow measurements obtained with a capture hood by performing appropriate m...

Страница 62: ...tal duct dimension V vertical duct dimension Pi 3 14 It is also possible to take a single reading to measure air velocity or air volume flow in a duct measuring in the center of the duct and multiplying the reading by 0 9 to correct for the higher velocity at the center of the duct If conditions are very good an accuracy of 5 or 10 percent may be obtained this way This method is not reliable howev...

Страница 63: ...rget to use the inside dimension of the duct if it is lined with insulation Traversing a Square Duct Using the log Tchebycheff method the duct is divided into rectangular areas which are further adjusted in size to account for effects of the duct wall on the air flow A minimum of 25 points must be measured in order to get a good average The number of data points to be taken along each side of the ...

Страница 64: ...gular Duct using Log Tchebycheff Method For this duct a 30 36 horizontal dimension requires 6 points or 6 traverse lines For this duct a vertical dimension less than 30 requires 5 points or 5 traverse lines of Points or Traverse Lines per Side Position Relative to Inner Wall 5 0 074 0 288 0 500 0 712 0 926 6 0 061 0 235 0 437 0 563 0 765 0 939 7 0 053 0 203 0 366 0 500 0 634 0 797 0 947 www netzer...

Страница 65: ...ned to deliver a volume of air to the targeted space with movement that entrains or mixes with the room air and increases optimal temperature uniformity and minimal sensible draft within the so called occupied zone Air flowing through Swirl or Twist type diffusers has traditionally caused significant measurement errors in capture hoods This is a remnant of the air flow pattern which swirls around ...

Страница 66: ...stream of the tested Swirl Diffusers 20 10 0 10 20 30 40 0 100 200 300 400 500 600 700 Measurement Error of Flow Flow m3 hr 8380 Performance Data SwirlDiffuser on 200mm Dia Duct 8380 with Swirl X 8380 No Swirl X 8380 Allowed Tolerance 20 10 0 10 20 30 40 0 200 400 600 800 1000 1200 Measurement Error of Flow Flow m3 hr 8380 Performance Data SwirlDiffuser on 300mm Dia Duct 8380 with Swirl X 8380 no ...

Страница 67: ...e two pieces together and place it in the base as shown below it will sit on top of the flange of the base 2 Install the support rods and 2 x 2 610 mm x 610 mm frame fabric 3 When set up use hood as normal There is no need to change K factors or access any special menus for use www netzerotools com www netzerotools com ...

Страница 68: ...re 2 of reading 0 0001 in H2O 0 025 pa static and differential 2 of reading absolute Velocity 3 of reading 7 ft min 0 04 m s 50 ft min 0 25 m s Volume 3 of reading 7 ft 3 min 12 m 3 h 50 ft 3 min 85 m 3 h Rh 3 RH Temperature 0 5 F 0 3 C Units Pressure in H2O pa hPa kPa mm Hg in Hg cm Hg mm H2O cm H2O Velocity ft min m s Volume ft 3 min m 3 h m 3 min l s Temperature degrees F degrees C Statistics m...

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