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Chapter 3: Getting Started

Common Terms

In this manual there are several terms that are used in different places. The following is a brief

explanation of the meanings of terms.

Term

Description

Sample

Consists of all of the measurement parameters stored at the same time.

Test ID

A group of samples. The statistics (average, minimum, maximum, and count)

are calculated for each test ID. The maximum number of test IDs is 100.

Time Constant

The time constant is an averaging period. It is used to dampen the display. If

you are experiencing fluctuating flows, a longer time constant will slow down

those fluctuations. The display will update every second, but the displayed

reading will be the average over the last time constant period. For example, if

the time constant is 10 seconds, the display will update every second, but the

displayed reading will be the average from the last 10 seconds. This is also

referred to as a “moving average”.

Note

: The time constant only applies to measuring velocity or volume when

using 960 series thermoanemometer probes or volume using the
capture hood.

Sample Time

Sample Time is the time period over which the Sample will be averaged. The

sample time can be adjusted when the data logging mode is set to Auto-

Save/RunAvg.

Log Interval

The logging interval is the period over which the instrument will average the

logged sample. For example, if the logging interval is set to 30 minutes, each

sample will be the average over the previous 30 minutes. Log Interval is used

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.

Average

The SUM divided by the number of Samples.

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Содержание EBT730

Страница 1: ...1 OWNER S MANUAL P N 6005725 REV D OCTOBER 2014 Model EBT731 Balometer Model EBT730 Micromanometer Air Balancing Instrument shown with standard and optional accessories www GlobalTestSupply com Find Quality Products Online at sales GlobalTestSupply com ...

Страница 2: ...www GlobalTestSupply com Find Quality Products Online at sales GlobalTestSupply com ...

Страница 3: ...N LIEU OF all other warranties and is subject to the LIMITATIONS stated herein NO OTHER EXPRESS OR IMPLIED WARRANTY 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 SH...

Страница 4: ...d 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 Probe 15 Extending the Probe 15 Retracting the Probe 16 Chapter 3 Getting Started 17 ...

Страница 5: ... 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 Traversing a Round Duct 63 Traversing a Square Duct 65 Appendix C Swirl X Flow Conditioner for Alnor...

Страница 6: ...esented 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 Technical Assistance Help For technical assistance or questions about the instrument or if the instrument needs repair or recalibration call Customer Service at 800 874 2811 USA or 1 651 490 2811 Internat...

Страница 7: ...e 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 BALOMETER AIR BALANCING INSTRUMENT TO TEST AIR FLOW IN DUCTS YOU MAY COME INTO CONTACT WITH OR BE EXPOSED TO DUST POLLEN MOLD FUNGUS OR OTHER AIRBORNE CONTAMINANTS IF YOU ARE OR M...

Страница 8: ...apters 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 EBT730 EBT731 Keypad AC Adapter Connection Display Headphone Connection USB Port Probe Connector RS 232 Port factory use only Figure 1 Features of the EBT730 EBT731 Micromanometer Front Vi...

Страница 9: ...EBT Balometer 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 for later recall o...

Страница 10: ...10 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 measurements useful in laboratory hood face velocity ...

Страница 11: ...vailable 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 Straight Probe 966 Air Velo...

Страница 12: ... 534534001 Two static pressure probes 3002017 16 ft 4 8 m Neoprene tubing 3900031 LogDat CH software N A USB cable 1303754 Operation and Service Manual 6005725 Calibration certificate N A Velocity Matrix Add On Kit 801090 Air Flow Probe 18 46 cm straight pitot probe 800187 Temperature and Humidity Probe 800220 Swirl X Flow Conditioner 801213 Air Velocity and Temperature Straight Probe 960 Air Velo...

Страница 13: ...st 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 NiMH batteries when the DIP switch in the battery compartment is set to NiMH If the DIP switch is set to Alkaline and the AC power adapter is connected then the batteries will be bypassed and the meter will be powered by the AC adapter Be sure to provide the ...

Страница 14: ...ing 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 the micromanometer see...

Страница 15: ...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 batteries that are too cold or too warm...

Страница 16: ...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 connected dashes will a...

Страница 17: ...abs 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 and the back pressure flap switch cable to...

Страница 18: ...d 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 connected the Temp Sourc...

Страница 19: ... 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 Source must be set to Entered The duct a...

Страница 20: ...robe 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 calculations for wet bulb or d...

Страница 21: ...dle 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 GlobalTestSupply com Find Quality Products Online at sales GlobalTestSupply com ...

Страница 22: ...tion 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 is pressed while the ...

Страница 23: ...E The SAVE key is used to save the currently displayed measurement to the data logging memory ESC Key The ESC Escape key is used to cancel end an operation or to exit a screen of displayed information NEXT TEST Advances the Test ID number The NEXT TEST key is used to select a new unused Test Id for saving Samples when logging data Print The PRINT key downloads data to an optional printer 8934 or t...

Страница 24: ... a moving average Note The time constant only applies to measuring velocity or volume when using 960 series thermoanemometer probes or volume using the capture hood Sample Time Sample Time is the time period over which the Sample will be averaged The sample time can be adjusted when the data logging mode is set to Auto Save RunAvg Log Interval The logging interval is the period over which the inst...

Страница 25: ...OOL 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 velocity measurement...

Страница 26: ... 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 options when in the Pressure Tool menu will be ...

Страница 27: ...rameter 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 Pressure Tool Note Depending...

Страница 28: ...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 Bluetooth Functions Applications Cf Selectio...

Страница 29: ...ons 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 probe capable of measuri...

Страница 30: ...to 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 deadband is Disabled readings down to 0 will ...

Страница 31: ...aro 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 Continuous measuremen...

Страница 32: ...e 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 the sample and return to the measuring mode ...

Страница 33: ...01 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 Std Setup Settings Da...

Страница 34: ... 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 Bluetooth Functions Applications Cf Selection C...

Страница 35: ...t 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 Display Mode Cont Time...

Страница 36: ...s 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 desired location press to accept Repeat u...

Страница 37: ...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 keys to view statisti...

Страница 38: ...cations 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 Applications Cf Selection Calibration DATA LOGGI...

Страница 39: ... 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 View Data Delete Data Me...

Страница 40: ...t 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 RunAvg Log Settings Choose Test Test 005 Name ...

Страница 41: ...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 include Disable The inst...

Страница 42: ...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 Log Tchebycheff Tcheb Duct Traverse See bel...

Страница 43: ...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 reading User can pre...

Страница 44: ... are not available for the Pressure Only or Flow K factor tools Calibration The Calibration Menu lists measurement parameters that can be adjusted in the field The appropriate detachable probes must be attached to the meter before field calibration can be undertaken except for pressure and barometric pressure calibration MENU Pressure Tool Display Setup Flow Setup Actual Std Setup Settings Data Lo...

Страница 45: ...PLES press the PRINT key to print the data LogDat CH Downloading Software The instrument also includes downloading software called 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 To download data from the EBT connect the supplied compu...

Страница 46: ...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 mount in the base There ...

Страница 47: ...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 pieces required for the frame size desired a...

Страница 48: ...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 GlobalTestSupply com Find Quality Products Online at sales GlobalTestSupply com ...

Страница 49: ...r 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 GlobalTestSupply com Find Quality Products Online at sales GlobalTestSupply com ...

Страница 50: ...rame 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 GlobalTestSupply com Find Quality Products Online at sales GlobalTestSupply com ...

Страница 51: ...ort 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 GlobalTestSupply com Find Quality Products Online at sales GlobalTestSupply com ...

Страница 52: ...t 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 Biological Safety Cabinets T...

Страница 53: ...ts 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 the screw and tighten with a Philips screwdriver Figure 25 Remove Plug Located at Back of Base Assembly 2 Attach ...

Страница 54: ...ious 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 Hood Base to Telescopic Stand www GlobalTestSupply com Find Quality Products Online at sales Glo...

Страница 55: ...ng 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 GlobalTestSupply com Find Quality Products Online at sales GlobalTestSupply com ...

Страница 56: ...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 GlobalTestSupply com Find Quality Products Online at sales GlobalTestSupply com ...

Страница 57: ...CT 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 BALOMETER AIR BALANCING INSTRUMENT Single Reading Measurements Single reading measurements are individual flow measurements initiated by pressing either the READ butt...

Страница 58: ...ater 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 over the diffuser grill or other opening...

Страница 59: ...d 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 EBT meter will display an error backpressure open g...

Страница 60: ...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 cloth and isopropyl ...

Страница 61: ...attery 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 appear on the display for velocity or volume A valid temperature is needed to perform the standard or actual velocity volume correction Verify a probe that ...

Страница 62: ... 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 multi point in duct velo...

Страница 63: ...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 however and should only be...

Страница 64: ...nner Wall 6 0 032 0 135 0 321 0 679 0 865 0 968 8 0 021 0 117 0 184 0 345 0 655 0 816 0 883 0 979 10 0 019 0 077 0 153 0 217 0 361 0 639 0 783 0 847 0 923 0 981 Before taking the measurement multiply the numbers in the table times the duct diameter to get insertion depth for the probe Do not forget to use the inside dimension of the duct if it is lined with insulation www GlobalTestSupply com Find...

Страница 65: ...ken For duct sides greater than 36 inches 7 points must be taken Multiply the numbers in the table times the duct dimension to get insertion depth for the probe 0 061 H 0 235 H 0 437 H 0 563 H 0 765 H 0 939 H H 0 074 V 0 288 V 0 500 V 0 712 V 0 926 V V Figure 32 Location of Measuring Points for Traversing a Rectangular Duct using Log Tchebycheff Method For this duct a 30 36 horizontal dimension re...

Страница 66: ...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 the hoo...

Страница 67: ...0 30 40 0 100 200 300 400 500 600 700 Measurement Error of Flow Flow m3 hr EBT731 Performance Data SwirlDiffuser on 200mm Dia Duct EBT731 with Swirl X EBT731 No Swirl X EBT731 Allowed Tolerance 20 10 0 10 20 30 40 0 200 400 600 800 1000 1200 Measurement Error of Flow Flow m3 hr EBT731 Performance Data SwirlDiffuser on 300mm Dia Duct EBT731 with Swirl X EBT731 no Swirl X EBT731 Allowed Tolerance ww...

Страница 68: ... 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 GlobalTestSupply com Find Quality Products Online at sales GlobalTestSupply com ...

Страница 69: ...ressure 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 Statist...

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