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31

Chapter 5. Changing Flow Hoods 

This chapter identifies the flow hood parts and gives instructions for assembling the flow hood. 

Flow Hood Parts Identification 

Figure 13 identifies the major parts of the capture hood, which are described in the following paragraphs. 
Before using the hood, please familiarize yourself with the various parts. You may also refer to Tables 1 
through 3. 
 

 

1  Fabric hood - Basic hood assembly 
2  Base allows micromanometer to be attached 
3  Micromanometer with display 
4 Flap 

Actuator 

5 Read 

Switch 

 

Figure 13:  Flow Hood Components 

Hood Assembly 

The Model 8375 Flow 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 “

Alternate Hood 

Installation

,” below. 

 
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 is a 
cup in each corner of the frame to accept the other end of each support pole.  

3.

 

Grasp the support pole. Bend the pole slightly to insert the top end of the pole into the support pole 
cup located in the opposite corner of the fabric frame. The poles are connected to the frame corners in 
a crisscross fashion as shown in Figure 14.  The support poles always cross as pairs at the front and 
back of the fabric hood. 

2

 

3

 

4

 

1 

5

 

Содержание 8375 ACCUBALANCE

Страница 1: ...0 DP CALCTM Micromanometer and Model 8375 ACCUBALANCE Modular Air Balancing Tool Operation and Service Manual 1980525 Revision E June 2009 Model 8375 ACCUBALANCE Modular Air Balancing Tool Model 8710 DP CALC Micromanometer ENERGY AND COMFORT ...

Страница 2: ...IN 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 TO THE EXTENT PERMITTED BY LAW THE EXCLUSIVE REMEDY OF THE USER OR BUYER AND THE LIMIT OF SELLER S LIABILITY FOR ANY AND ALL LOSSES INJURIES OR DAMAGES CONCERNING THE GOODS INCLUDING CLAIMS BASED ON CONTRACT NEGLIGENCE TOR...

Страница 3: ......

Страница 4: ... the Pitot Tube to the Micromanometer 8 Connecting the Static Pressure Port to the Micromanometer 8 Attaching the Micromanometer to the Capture Hood Base 9 Connecting the Velocity Matrix to the Micromanometer 9 Connecting the Air Flow Probe to the Micromanometer 10 Connecting the Temperature Probe or Temperature and Humidity Probe to the Micromanometer 10 Chapter 3 Getting Started 13 Keypad Operat...

Страница 5: ... Connect and Download Data to an Optional Printer 28 Connect and Download Data to a Computer 29 Data Acquisition Polling 29 Chapter 5 Changing Flow Hoods 31 Flow Hood Parts Identification 31 Hood Assembly 31 Alternate Hood Installation 32 Direct Inflow Measurement Hood for Biological Safety Cabinets 37 Chapter 6 Flow Measurements Using the Capture Hood 43 Non Backpressure Compensated Measurements ...

Страница 6: ...AIR BALANCING INSTRUMENT Formatting and Typography 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 manu...

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Страница 8: ... rooms and biological safety cabinets Measure fume hood or filter face velocity Measure pressure temperature relative humidity air velocity or air flow Instrument Description The basic Model 8710 includes a micromanometer carrying case 18 in 46 cm pitot tube 2 static pressure probes 2 8 ft 2 4 m Norprene tubing user manual LogDat for Windows data downloading software and RS232 interface cable neck...

Страница 9: ...TIVE TO DUST POLLEN MOLD FUNGUS OR OTHER AIRBORNE CONTAMINANTS ALWAYS USE AN APPROPRIATE MASK OR RESPIRATOR WHILE EMPLOYING THE ACCUBALANCE AIR BALANCING INSTRUMENT Micromanometer Figures 1 and 2 show the features of the micromanometer Figure 1 Features of the Model 8710 DP CALC Micromanometer Front View Figure 2 Features of the Model 8710 DP CALC Micromanometer Back View Display Keypad AC Adapter...

Страница 10: ...low measurements through diffusers registers and grilles Capture hoods are available in a kit with one 2 ft 2 ft 610 mm 610 mm fabric hood frame and base assembly Alternate hood sizes are available and descriptions and part numbers can be found in Table 2 of Chapter 2 in this manual Velocity Matrix The velocity matrix is primarily used to obtain area averaged multi point air velocity measurements ...

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Страница 12: ...el No TSI Model 8710 DP CALC Micromanometer 8710 XXX TSI Model 8375 ACCUBALANCE Modular Air Balancing Tool with North American AC Adapter TSI Model 8375 ACCUBALANCE Modular Air Balancing Tool with multi Country AC Adapter 8375 8375M Carrying case 1319378 Carrying case wheeled hood kit Model 8375 1319379 AA size NiMH battery four required 1208048 Operation and Service Manual 1980495 Velocity Matrix...

Страница 13: ...is product 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 micromanometer you must decide on a power source Power the Micromanometer with the AC Adapter When the AC adapter is plugged into the micromanometer the unit automatically turns on runs a brief diagnostic check a...

Страница 14: ...tch to indicate the type of batteries you are using Figure 5 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 Figure 4 2 Press down on the compartment cover and slide it down The cover slides off 3 Remove the batter...

Страница 15: ...r 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 can cause the charge cycle to stop early Connecting the Pitot Tube to the Microma...

Страница 16: ...emperature cable and the back pressure flap switch cable to the right side of the meter 4 To remove the meter from the base first disconnect the temperature cable and the back pressure flap switch cable then press upward on the metal retaining clip to release the meter from the base Figure 8 Attaching the Meter to the Capture Hood Base Connecting the Velocity Matrix to the Micromanometer The posit...

Страница 17: ... negative pressure port on the micromanometer and the total pressure port on the Air Flow Probe will be connected to the positive port on the micromanometer see Figure 10 Note Observe the arrow indicator on the Air Flow Probe when taking air velocity or air volume measurements Figure 10 Air Flow Probe Connecting the Temperature Probe or Temperature and Humidity Probe to the Micromanometer The Temp...

Страница 18: ...Chapter 2 Unpacking and Setting Up 11 Figure 11 Connector for the Temperature Probe or Temperature Humidity Probe ...

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Страница 20: ...nt to use one of the other keys The ENTER key is used to accept the present value or move to the next level of a menu READ If the display mode is set to SINGLE pressing the READ key begins a reading which stops automatically when the reading is done If the display mode is set to RUNAVG the micromanometer will measure continuously and pressing READ will alternately pause or resume the measurement S...

Страница 21: ...for more information on continuous data logging Test ID A Test ID consists of a group of Samples A Test ID can contain up to 1000 Samples The maximum number of Test IDs is 255 Any new Sample will be saved to the current Test ID You can change the current Test ID at any time to keep your data organized refer to instructions in Chapter 4 The unit does not allow you to store Samples of different char...

Страница 22: ... a reading which stops automatically when the reading is done If the display mode is set to RUNAVG the micromanometer will start measuring continuously and pressing READ will pause and resume the measurement See Chapter 4 on how to set the display mode to SINGLE or RUNAVG 4 While the unit reads the measurements it makes a clicking sound 5 When data collection is finished the display shows the pres...

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Страница 24: ...Data Acquisition Polling Note The operations described below assume you are starting from the READY display As you use the instrument you will find it unnecessary to return to the READY display each time Press the ESC key one or more times to return to the READY display Select a Tool The instrument accepts a number of different measurement devices referred to as Tools The Tools are Capture hoods f...

Страница 25: ...able 3 above to indicate the currently selected TOOL and the units selected for it 4 Press S or T to scroll through the available TOOLs See Table 3 above 5 When the TOOL you want to use is displayed press 6 If you select flow using either a pitot tube or an Air Flow probe the display will flash a and This indicates that you need to enter the duct shape and duct size Proceed with steps 7 10 If you ...

Страница 26: ... you press SAVE or try to automatically log data to a Test ID and the Tool or display units or measurement parameters are different from the information already stored in the currently selected Test ID the instrument will automatically change the currently selected Test ID to a new unused Test ID See the description of TEST IDs in Chapter 3 Recall Sample Data To recall Sample data so that you can ...

Страница 27: ... display CHANGE Test ID 2 Press X until DELETE appears 3 Press The display shows DELETE ALL 4 Press X The display shows DELETE Test ID 5 Press The display shows the currently selected Test ID 6 Use S and T to display the Test ID whose Samples you want to delete 7 Press DELETE flashes while all Samples for the selected Test ID are deleted 8 Repeat steps 6 and 7 to delete other Test IDs Delete a Sin...

Страница 28: ...u set four K factors for each tool that uses a K factor 5 If you want to change the value of a K factor use S and T to change the K factor to the value desired 6 Press to accept the desired K factor K FACT is displayed 7 You can repeat steps 3 6 to select and or adjust other K factors for the Tool Once you set a K factor it remains set until you change it View Set Standard Pressure and Temperature...

Страница 29: ... entered temperature using S and T then press to save it and return to the STP SET menu Note To save time if a temperature probe is installed you can copy the measured temperature to the entered temperature by pressing READ ENTered temperature is used for density correction of velocity or flow values only if no temperature probe is connected If a temperature probe is connected during velocity or f...

Страница 30: ...O is displayed 14 Press The display shows the current velocity flow units Options are ft min for velocity with CFM for flow and m s for velocity with either l s m3 h or m3 min for flow 15 Use S and T to select between options If m3 h or m3 min is selected for flow m s will be used for velocity even though m s is not shown on the display 16 Press when you have selected the desired units 17 Press X ...

Страница 31: ...0 2400 and 1200 7 Press BAUD is displayed 8 Press ESC to return to SETUP Set the Format for Date and Decimal The Format option lets you set the format for the date mm dd or dd mm and also for the delimiter or the instrument uses 1 Press to display CHANGE 2 Press X until SETUP appears 3 Press 4 Press X until FORMAT appears 5 Press The currently selected format appears 6 Press S or T to change the f...

Страница 32: ... logging means reading and saving is done automatically at the user selectable Sample Logging Interval Then the continuous logging is started and stopped by pressing SAVE 1 Press to display CHANGE 2 Press X until SETUP appears 3 Press 4 Press X until LOG appears 5 Press The display shows the currently selected option Options are DISCRT and CONTIN 6 Press S or T to change the logging option 7 Press...

Страница 33: ...witch READ CLOSEd flashes on the display 6 When the closed flap reading is done the backpressure compensated flow is displayed 7 If you want to save the flow reading to log memory press SAVE now STORE is shown on the display then the saved reading is shown 8 Before pressing any more buttons open the flap 9 If the display mode is set to SINGLE pressing READ now will start a new backpressure compens...

Страница 34: ...rors are shown on the display it is because the user calibration data taken is too much different from the factory calibration data Error codes are explained at the end of Chapter 7 Notes The calibration for the accessory temperature humidity probe is saved on an EEPROM in the probe If that probe is unplugged and used in a different micromanometer the calibration will follow the probe The calibrat...

Страница 35: ...tional printer Note that the printer interface cable is different from the computer interface cable The printer must be set to the same baud rate as the instrument To change the baud rate of the printer refer to the printer s operations manual Always turn the instrument on before the printer If the printer prints question marks asterisks or random characters reset it by turning it off and then on ...

Страница 36: ...e program LogDat which comes with your micromanometer can be used to assist in downloading data to a Windows based computer and formatting that data To install LogDat software run the SETUP EXE file on the LogDat distribution disc Once you open the program it is self directing and provides all the necessary instructions for downloading data Data Acquisition Polling The micromanometer is designed t...

Страница 37: ......

Страница 38: ...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 Alternate Hood Installation below 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 is a c...

Страница 39: ... cord out of the aluminum 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 15 through 18 to determine the frame channels needed to assemble any of the standard sized...

Страница 40: ...e 15 1 ft 4 ft 305 mm x 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 x 1220 mm the support poles are inserted into the outside ferrule locations 2 1 3 1 2 3 ...

Страница 41: ...ways cross as pairs at the front and back of the fabric hood For the 2 ft 4 ft 610 mm x 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 20 2 1 4 1 2 4 ...

Страница 42: ...e 17 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 inside ferrule locations 2 1 3 1 2 3 5 5 ...

Страница 43: ... Tool Figure 18 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 ferrule locations Figure 19 Frame Corner Assembly 1 6 6 1 6 1 6 1 ...

Страница 44: ...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 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 H...

Страница 45: ...romanometer in a vertical position when mounted to a biological safety cabinet or lab hood Figure 22 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 23 Place the threaded insert on the ou...

Страница 46: ...o fit various cabinet widths Figure 24 Attach Fabric Hood and Hood Support Poles to Frame and Base Assembly 4 Mount the Micromanometer 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 25 Figure 25 Mount Micromanometer Base to Telescopic Stand 5 Adjust the height and position of the teles...

Страница 47: ... sash of the cabinet until it rests on the foam lip of the hood frame see Figure 27 Figure 27 Lower Sash of Cabinet Until it Rests on Foam Lip of Hood Frame 7 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 28 ...

Страница 48: ...Chapter 5 Changing Flow Hoods 41 Figure 28 Unit Ready to Make Measurements ...

Страница 49: ......

Страница 50: ... AIRBORNE CONTAMINANTS ALWAYS USE AN APPROPRIATE MASK OR RESPIRATOR WHILE EMPLOYING THE ACCUBALANCE AIR BALANCING INSTRUMENT Non Backpressure Compensated Measurements To take non backpressure compensated measurements be sure the Back Pressure Compensation function is turned OFF see Turn Back Pressure Compensation On and Off in Chapter 4 Non backpressure compensated measurements can only be made wi...

Страница 51: ...mpensated measurements require two sequential measurements first with the back pressure flap OPEN and then with the flap CLOSED Here is the sequence of operation 1 Place the capture hood over the diffuser grille or other opening through which you wish to make a measurement 2 Open the back pressure flap This can easily be accomplished by pressing up on the flap handle with your left hand as you hol...

Страница 52: ... are exceeded during a backpressure compensated measurement an error message will be displayed This can happen if there are flow reversals during the measurement or other changes in the flow during the measurement such as changing a damper position or as a result of other operator errors ...

Страница 53: ......

Страница 54: ...rary repair If you wish to order a new hood fabric use the following part numbers shown in Table 4 Table 4 Hood Fabric Only Part Numbers Fabric Hood Size Part Number 2 ft 2 ft 610 mm 610 mm 1801197 1 ft 4 ft 305 mm 1220 mm 1801198 2 ft 4 ft 610 mm 1220 mm 1801199 1 ft 5 ft 305 mm 1525 mm 1801200 3 ft 3 ft 915 mm 915 mm 1801210 Micromanometer The micromanometer case display screen and keys can be c...

Страница 55: ...ded solutions for common problems encountered with the instrument If your symptom is not listed or if none of the solutions solves your problem please contact the factory Table 5 Troubleshooting the Instrument Symptom Possible Causes Corrective Action No display Unit not turned on Low or dead batteries Dirty battery contacts AC adapter not connected Press I O key Replace the batteries Clean the ba...

Страница 56: ...D converter calibration checksum error Return to factory 20 Barometric pressure sensor calibration checksum error Return to factory 30 Pressure calibration voltage at 1 in H2O must be less than pressure calibration voltage at 5 in H2O Make sure calibration pressures are correct 31 Pressure calibration voltage at 5 in H2O must be less than pressure calibration voltage at 15 in H2O Make sure calibra...

Страница 57: ... factory 54 AD7718 A to D converter calibration factor out of range Return to factory 55 User entered flow temperature out of range The micromanometer has reset the temperature to 70 0 F 21 1 C to correct it 56 Barometric pressure zero factor out of range Return to factory 57 Barometric pressure span factor out of range Return to factory 58 Offset factor for user temperature sensor calibration out...

Страница 58: ... 70 5V reference voltage out of range Return to factory 71 72 An invalid K Factor was corrected The micromanometer has set the K factor to 1 0 to correct it 74 Pressure voltage for user pressure calibration out of range Re do user calibration 75 User temperature calibration 5 F 3 C different from factory calibration Re do user calibration Replace temperature probe 100 Internal program error Please...

Страница 59: ......

Страница 60: ... 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 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...

Страница 61: ......

Страница 62: ... temperature in units of F Standard Air Velocity is also known as the mass velocity of air It can be thought of as the local air velocity corrected to standard conditions of air Standard Conditions are defined as air at 70 F and PSTD 29 92 in Hg Substituting Standard Conditions into Eq 2 above we can see that 3 m air ft lb 0748 0 460 70 92 29 325 1 STD ρ Eq 3 Standard Air Velocity and Standard Air...

Страница 63: ...he air flow being measured in units of F VACT is Actual Air Velocity in units of AFPM VSTD is Standard Air Velocity in units of SFPM Similarly to convert from Standard to Actual Air Velocity use the following equation ACT ACT ACT STD V 05645 0 P 460 T V Eq 7 For Volumetric Flow measurements the analysis is exactly the same Thus STD ACT ACT ACT Flow 714 17 460 T P Flow Eq 8 ACT ACT ACT STD Flow 056...

Страница 64: ...H Temperature 0 5 F 0 3 C from 32 to 160 F 0 to 71 C max 2 0 F 1 2 C from 40 to 32 F 40 to 0 C and from 160 to 250 F 71 to 121 C Units Pressure in H2O pa hPa kPa mm Hg in Hg cm Hg mm H2O cm H2O Velocity ft min m s Volume ft3 min m3 h m3 min l s Temperature degrees F degrees C Statistics min max average up to 1000 readings Data Storage 1000 readings time and date stamped Logging Interval user selec...

Страница 65: ...ng the details below UK Office Keison Products P O Box 2124 Chelmsford Essex CM1 3UP England Tel 44 0 330 088 0560 Fax 44 0 1245 808399 Email sales keison co uk Please note Product designs and specifications are subject to change without notice The user is responsible for determining the suitability of this product ...

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