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

Содержание ProHood PH730

Страница 1: ...INSTRUMENTS PROHOOD CAPTURE HOOD MODELS PH730 PH731 OWNER S MANUAL P N 6005724 REVISION D OCTOBER 2014 Model PH731 ProHood Model PH730 Micromanometer Capture Hood shown with standard and optional acce...

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Страница 3: ...ts of the manual Unless specifically authorized in a separate writing by Seller Seller makes no warranty with respect to and shall have no liability in connection with goods which are incorporated int...

Страница 4: ...ce policy is designed to give prompt attention to any problems If any malfunction is discovered please contact your nearest sales office or representative or call Customer Service department at 800 87...

Страница 5: ...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 Tem...

Страница 6: ...nsated 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 Pr...

Страница 7: ...d 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 t...

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Страница 9: ...to 8934 printer or PC Powered by AC adapter or batteries rechargeable NiMH or alkaline Full field calibration Designed for Test and balance professionals Mechanical contractors Industrial hygienists P...

Страница 10: ...re also available to meet your measurement needs The following paragraphs provide brief descriptions of the micromanometer and the various standard and optional tools for use with the ProHood Capture...

Страница 11: ...the PH730 PH731 Micromanometer Back View Figures 3 and 4 show the features of the ProHood Capture Hood Removable Center Handle Backpressure Flap Actuator Switch to pause a reading or to initiate backp...

Страница 12: ...description of standard tools for the micromanometer Pitot Tube The pitot tube is primarily used to obtain air velocity air volume and velocity pressure measurements within ductwork An 18 in 46 cm pit...

Страница 13: ...ge of 5 to 95 RH along with calculated wet bulb temperature of 40 to 140 F 4 to 60 C and dewpoint temperature of 5 to 120 F 15 to 49 C Thermoanemometer Probes Thermoanemometer probes can be used to me...

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Страница 15: ...quired 1208048 Two battery 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 c...

Страница 16: ...oduct and mail it promptly The card allows us to inform you of product updates If you prefer register through the TSI web site Preparing the Instrument for Use Before you can use the Electronic Balanc...

Страница 17: ...the compartment cover and slide it down The cover slides off 3 Remove the battery holder by pulling up on the bottom to loosen it and then pulling the battery holder free 4 Refer to Figure 6 and set...

Страница 18: ...tteries are used the battery indicator will show four 4 bars when first turned on With NiMH batteries the indicator may show a lower value even when they are fully charged C A U T I O N The percent po...

Страница 19: ...obe 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 pro...

Страница 20: ...e 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 th...

Страница 21: ...ity matrix The handle 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...

Страница 22: ...w indicator 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 nee...

Страница 23: ...eter Probes or Temperature 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 ex...

Страница 24: ...ting the 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 n...

Страница 25: ...NU Figure 14 Keypad 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 Num...

Страница 26: ...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 Comm...

Страница 27: ...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...

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Страница 29: ...tions Cf Selection Calibration 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 O...

Страница 30: ...low units 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 m...

Страница 31: ...ement will be displayed 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 L...

Страница 32: ...YPE Round 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...

Страница 33: ...ta Logging Bluetooth 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 T...

Страница 34: ...DD YY 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...

Страница 35: ...te Data Memory MEASUREMENTS 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 t...

Страница 36: ...ng 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 I...

Страница 37: ...al 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 Auto...

Страница 38: ...Log Mode 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 Tim...

Страница 39: ...og 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 time the lo...

Страница 40: ...Log Mode 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...

Страница 41: ...the number of samples 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...

Страница 42: ...wireless printer 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 Blu...

Страница 43: ...g Settings Choose Test 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 Set...

Страница 44: ...mples Test 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...

Страница 45: ...Bluetooth capable devices MENU Pressure Tool Display Setup Flow Setup Actual Std Setup Settings Data Logging Bluetooth Functions Applications Cf Selection Calibration BLUETOOTH FUNCT Discover Devices...

Страница 46: ...arious tests or investigations Applications include Heat flow Turbulence and Log Tchebycheff Duct Traverse For more information on these applications refer to the following information Heat Flow calcu...

Страница 47: ...gle Meter will display READY o Press READ to initiate measurement o Sample countdown based on the Time Constant setting will be displayed When Sample countdown is complete o Press SAVE to store the me...

Страница 48: ...the Cf Selection screen Note Calibration factors are not available for the Pressure Only or Flow K factor tools Calibration The Calibration Menu lists measurement parameters that can be adjusted in th...

Страница 49: ...es 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...

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Страница 51: ...ood Assembly The Capture 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...

Страница 52: ...he hood and include 2 ft 4 ft 610 mm 1220 mm 1 ft 4 ft 305 mm 1220 mm 1 ft 5 ft 305 mm 1525 mm and 3 ft 3 ft 915 mm 915 mm To change hood sizes first remove the hood currently attached to the base To...

Страница 53: ...different length and a corner piece This corner piece has an eyelet and slot arrangement which mates with a similar eyelet and slot at the end of the straight portion of the channel pieces see Figure...

Страница 54: ...airs at 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...

Страница 55: ...re 19 1 ft 5 ft 305 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...

Страница 56: ...3 ft 3 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...

Страница 57: ...the frame first and 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 al...

Страница 58: ...igure 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 s...

Страница 59: ...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 fas...

Страница 60: ...f the hood 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 cabi...

Страница 61: ...Adjust the flaps to 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 Fig...

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Страница 63: ...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 MAY BE SENSITIVE TO DUST POLLEN MOLD FUNGUS OR OTHER AIRBORNE CON...

Страница 64: ...surement 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 Backpressur...

Страница 65: ...t 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 t...

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Страница 67: ...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 pl...

Страница 68: ...ts 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...

Страница 69: ...rst with the back 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 o...

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Страница 71: ...am from any turns or flow obstructions It is possible to do a traverse as little as 2 duct diameters downstream and 1 duct diameter upstream from obstructions but measurement accuracy will be impaired...

Страница 72: ...en across the duct averaging the velocities obtained at each measuring point Then the average velocity is multiplied by the duct area to get the flow rate A different method uses 2 holes at 90 from ea...

Страница 73: ...es of 30 to 36 inches 6 points must be taken 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 prob...

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Страница 75: ...HVAC components are designed 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 d...

Страница 76: ...upstream 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 PH731 Performance Data SwirlDiffuser on 200mm Dia Duct PH731 with Swirl X...

Страница 77: ...n and Usage 1 Put the 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...

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Страница 79: ...3 h Rh 0 1 RH Temperature 0 1 F 0 1 C Accuracy Pressure 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 Vol...

Страница 80: ...I Instruments Ltd Visit our website at www airflowinstruments co uk for more information UK Tel 44 149 4 459200 France Tel 33 491 11 87 64 Germany Tel 49 241 523030 P N 6005724 Rev D 2014 TSI Incorpor...

Страница 81: ...er and supplier in a wide variety of industries Originating from the Netherlands Observator has grown into an internationally oriented company with a worldwide distribution network and offices in Aust...

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