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Model 8372/73

CCU

ALANCE

Plus

Air Capture Hood

Operation and Service Manual

1980336, Revision C

October 2002

V e n t i l a t i o n T e s t i n g / B a l a n c i n g

Summary of Contents for 8372

Page 1: ...Model 8372 73 ACCUBALANCE Plus Air Capture Hood Operation and Service Manual 1980336 Revision C October 2002 V e n t i l a t i o n T e s t i n g B a l a n c i n g ...

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Page 3: ... Service Manual 1980336 Revision C October 2002 U S Sales and Customer Service 1 800 874 2811 USA 001 651 490 2811 Fax 001 651 490 3824 MAIL TO TSI Incorporated 500 Cardigan Road Shoreview MN 55126 3996 USA E mail address answers tsi com Website http www tsi com ...

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Page 5: ... 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 TORT STRICT LIABI...

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Page 7: ...ow Direction 9 Taking a Flow Measurement 10 Turning the ACCUBALANCE Plus Off 10 Automatic Shut off 11 2 OPERATIONS IN MORE DETAIL 13 Keypad Functions 13 Field Calibration Model 8372 Only 24 Additional Keypad Functions for the Model 8373 24 Field Calibration Model 8373 Only 25 Changing Hoods 26 Changing DIP Switch Settings 30 Switch Number 31 Connecting the Optional Printer 31 Connecting to a Compu...

Page 8: ...ii 4 TROUBLESHOOTING 37 Appendixes A BACK PRESSURE 41 B SPECIFICATIONS 43 ...

Page 9: ...isplayed messages appear in quotes When reference is made to other sections of the manual the section title is italicized Example The SAMPLE message will appear along with a flow value after you have activated the SAMPLE key from Display in Chapter 1 HELP If you need technical assistance with this instrument have questions about the manual or your air capture hood needs repair or recalibration ple...

Page 10: ... plastic base which contains an electronic meter and a flow sensing manifold located within the base Air flowing through the hood is measured by a hot film sensor located in the central hub of the flow sensing manifold The twenty four pairs of flow sensing ports in the manifold are strategically located so that the ACCUBALANCE Plus provides the highest degree of measurement accuracy even in non un...

Page 11: ...Carefully unpack the instrument and accessories from the carrying case Check the individual parts against the list of components in Tables 1 through 3 If any are missing or damaged notify TSI immediately Table 1 List of components Qty Item Part No 1 Model 8372 8373 base N A 1 2 ft x 2 ft 610 mm x 610 mm hood fabric 1307060 6 Frame support poles 1081390 4 2 ft 610 mm frame tubing 1081262 6 Right an...

Page 12: ...ft 610 mm frame tubing 1081262 4 1 ft 305 mm frame tubing 1081260 6 Right angle tubing connectors 1081584 6 Straight tubing connectors 1302833 Table 3 List of components 5 Hood Kit adds 4 hoods to the base kit Qty Item Part No 1 2 ft x 4 ft 610 mm x 1220 mm hood fabric 1801065 1 1 ft x 4 ft 305 mm x 1220 mm hood fabric 1801066 1 1 ft x 5 ft 305 mm x 1525 mm hood fabric 1801067 1 3 ft x 3 ft 915 mm...

Page 13: ...n Chapter 2 2 Right handle with SAMPLE key used for capturing information on the display 3 Meter base 4 Electronic meter and display Detailed keypad functions are covered in Chapter 2 5 Printer bracket Allows the Model 8925 to be attached to the ACCUBALANCE base for ease of use and recording of data 6 Left handle with PRINT button Used to print that which is on the display value to the portable pr...

Page 14: ...w calibration is being utilized by the ACCUBALANCE Notice For Model 8372 Be sure this arrow points in the direction of flow through the ACCUBALANCE Plus otherwise the measurements made will be inaccurate To change the direction of the arrow press the SUPPLY RETURN key The Model 8373 senses direction automatically 5 SAMPLE will appear every time you press the SAMPLE key or the button on the top of ...

Page 15: ...nits The ACCUBALANCE Plus is shipped with cubic feet per minute CFM as the default flow unit F for temperature and in Hg inches of mercury for barometric pressure unless the metric version was ordered If you wish to change the units to l s liters per second m3 hr cubic meters per hour m3 min cubic meters per minute C for temperature and mm Hg millimeters of mercury for barometric pressure see Chan...

Page 16: ...the format is HH MM where HH is the hour in 24 hour format and MM is minutes and the date It is very important to set the time and date correctly otherwise date and time stamping of recorded data will not be correct This information has been set to Central Time GMT 6 hours Standard or Daylight Savings at the factory before shipping The ACCUBALANCE Plus does not self adjust for Daylight Savings Tim...

Page 17: ...le baud rate that is used when downloading or printing data from the instrument By changing the baud rate to a higher rate the data will be downloaded faster NOTE The baud rate must be equal to that of your computer or printer The baud rate for the Model 8925 printer is set as 1200 The instrument baud rate is displayed during the initial power up sequence To change the baud rate press and hold eit...

Page 18: ... remaining will not be accurate for NiCd batteries because they do not discharge linearly with power use Hood Assembly The ACCUBALANCE Plus is shipped from the factory partially assembled with the 2 ft x 2 ft nylon hood attached to the base If you wish to use another hood size see Changing Hoods in Chapter 2 To complete the assembly of the 2 ft x 2 ft hood follow these six steps 1 Place the base o...

Page 19: ...ts electronic functions If an error is found an error message will appear on the display Refer to Chapter 4 Troubleshooting if an error message appears If no errors are found the ACCUBALANCE Plus will automatically proceed to the measurement mode Selecting Flow Direction Each ACCUBALANCE Plus is calibrated for supply and return air separately for increased accuracy The ACCUBALANCE Plus will assume...

Page 20: ... handle The display will show the word SAMPLE for the length of time as determined by the TIME CONSTANT When the sample is complete the value will remain on the display until SAMPLE is pressed again and the meter will return to continuous measuring mode If the readings are fluctuating increase the TIME CONSTANT to a higher number This is done by pressing and holding the TIME CONSTANT key Use the o...

Page 21: ...e been pressed for 10 minutes This feature minimizes accidental loss of battery power This feature may be disabled by changing the factory settings This is discussed in the Changing DIP Switch Setting section of the next chapter Automatic shut off is disabled during downloading of data to a printer or computer ...

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Page 23: ...ith power use SUPPLY RETURN Press to toggle between measuring supply flow and return flow The arrows on the display will indicate the direction of the flow for return for supply This key does not appear on Model 8373 as automatic detection of flow direction is a feature K FACTOR Volume measurements with the ACCUBALANCE Plus is a means to take readings more quickly than methods used in the past How...

Page 24: ...t The ambient temperature will then be displayed Press the or key to change the value and ENTER to accept it and return to measuring mode Ambient temperature and barometric pressure can also be set by pressing either the or key when the parameter is displayed during power up The Model 8373 automatically senses the barometric pressure and ambient temperature These values cannot be changed The value...

Page 25: ... instrument is turned on BALANCE MODE The BALANCE MODE is a feature that allows the user to have the instrument indicate how close a flow is to a desired flow rate This is useful when a series of diffusers or outlets are designed for the same flow rate To use the BALANCE MODE function follow the steps below Press BALANCE MODE to start displaying in BALANCE MODE with the real flow rate displayed on...

Page 26: ...me to return to the measurement mode and then press SAMPLE to store a value ENTER Press to accept a value or condition SAMPLE or Right Handle Button The ACCUBALANCE Plus features the ability to store flow readings in a complete convenient and organized manner The instrument s memory allows you to organize data into groups made up of TEST IDs BRANCHES and TERMINALS TEST IDs contain data organizes b...

Page 27: ... TERMINALs with the same TERMINAL number within a TEST ID Rule 3 The total number of the TERMINALs BRANCHes TEST IDs must be less than 1 000 values Using these three rules here are a few ways of organizing the data for our example TERM 1 TERM 4 B R A N C H 1 R E T U R N TERM 2 AHU TEST ID 2 TERM 1 TERM 8 TERM 9 TERM 6 TERM 5 BRANCH 1 SUPPLY TERM 3 TERM 7 TERM 2 TERM 3 TEST ID 1 Figure 8 Building S...

Page 28: ...otice how in this arrangement there is a BRANCH 1 TERMINAL 1 in each TEST ID TEST ID 4 TERM 8 BRANCH 2 BRANCH 1 TERM 1 TERM 4 TEST ID 1 AHU R E T U R N BRANCH 2 TERM 2 BRANCH 1 TEST ID 2 TERM 1 BRANCH 3 SUPPLY TERM 5 TERM 6 BRANCH 3 TERM 3 TERM 9 TERM 3 TERM 2 TEST ID 3 TERM 7 Figure 10 Building System 4 Tests and 6 Branches Figure 10 is the same physical arrangement as Figure 9 with BRANCHes and ...

Page 29: ...be displayed on the large display Press the keys to change the Test ID Only Test ID s with the flow the same direction or new ID s will be displayed Press the sample or enter key to accept the Test ID The unit will then flash TERMINAL on the display Proceed to step 3 3 The average reading is held on the display TERMINAL will flash and the first available terminal number will be displayed in the sm...

Page 30: ...nd will then return to measurement mode This function can only be used to remove one value from memory It cannot be used again until another sample is stored 2 To clear the entire memory Press and hold the TEST ID CLEAR key until a 5 to 0 countdown begins Release the key when the countdown reaches 0 Display will show CLR and MEMORY and will then return to measurement mode ONCE THE MEMORY IS CLEARE...

Page 31: ...ll be displayed 3 Press STATISTICS repeatedly to display MINIMUM MAXIMUM AVERAGE and COUNT 4 Press ENTER twice to return to continuous measuring mode To view STATISTICS of the current TEST ID and the BRANCH STATISTICS 1 Press STATISTICS to view the TOTAL of the current TEST ID TEST ID and the current number of the TEST ID will flash on the small display The TOTAL value will be displayed on the lar...

Page 32: ...COUNT 7 Press ENTER to return to continuous measuring mode To review data of the current TEST ID 1 Press and hold STATISTICS key Release the STATISTICS key when TEST ID and the number of the current TEST ID flashes on the small display The big display has SUP and a to represent that it is a supply Test ID If the Test ID is a return Test ID the big display has RET and the indicated 2 Press ENTER Th...

Page 33: ...To do so follow these steps 1 Press and hold the STATISTICS key Release the STATISTICS key when TEST ID and the number of the current TEST ID flashes on the small display 2 Press the or key to select the TEST ID that contains the data you wish to alter 3 Press ENTER The small display will flash TERMINAL along with a number and will then flash BRANCH and a number This identifies the value that you ...

Page 34: ...he instrument with the adjusted values DIP switch 7 must remain in the ON position All adjustment values and offsets are stored in the instrument and will remain the same until changed again To return to all factory settings turn DIP switch 7 OFF Additional Keypad Functions for the Model 8373 FLOW TEMP Press to toggle between temperature on the small digits and flow on the large digits to only tem...

Page 35: ...lt is 0 Continue to press or key until the desired adjustment percentage is displayed Press ENTER 3 The ambient temperature will be shown on the large display and CAL will be on the small display 4 To adjust the reading of ambient temperature press the or key On the small display ADJ will appear along with degree adjustment on the large display The range of adjustment can be from minus 6 to plus 6...

Page 36: ...he aluminum frame tubing Notice that the fabric stretches around the outside then up and over the frame structure The Velcro on the fabric reaches down to mate with the Velcro on the frame structure Notice also that all Velcro surfaces on the frame tubing face inward Finally fold up the fabric you just removed so that it can fit into one of the accessory pockets inside the ACCUBALANCE Plus carryin...

Page 37: ... bonding of the fabric to the frame 4 Stretch the cinch belt at the bottom of the fabric over the lip around the top of the molded plastic base of the ACCUBALANCE Plus Align the seams of the fabric panels with the pairs of screw heads that hold the four pole mounts to the ACCUBALANCE Plus base Align so that the cinch belt latch is on the side of the base opposite the electronics meter 5 Pull the s...

Page 38: ...ght it is a good practice to check the rubber gasket around the top edge of the ACCUBALANCE Plus fabric In order to achieve a good straight alignment of the rubber gasket along the top of the frame structure you may need to peel back and re attach small portions of the Velcro surfaces 10 Finally at the corners tuck the straight rubber gasket flaps under the edges cut at an angle This will create a...

Page 39: ...g pieces and four right angle tubing connectors Remember to construct the frame so that all Velcro surfaces face in toward the center of the structure Notice Make sure that all support pole cups in the aluminum frame tubing pieces are facing downward Figure 13 Diagram of 1 ft x 5 ft frame 2 Unfold the 1 ft x 5 ft fabric hood Continue with steps 3 through 10 beginning on page 27 3 ft x 3 ft Hood To...

Page 40: ...ough 10 beginning on page 27 Changing DIP Switch Settings You can change flow units and other parameters by adjusting the settings of the DIP switches located inside the battery compartment To gain access to the DIP switches first turn off the ACCUBALANCE Plus and lay down the instrument with the electronic meter facing down Remove the battery compartment cover by pulling up on the two latches You...

Page 41: ...rature units C 5 OFF Auto shut off on ON Auto shut off off 6 OFF Decimal for fractions ON Comma for fractions 7 OFF Field calibration disabled ON Field calibration enabled 8 OFF Audible buzzer on ON Audible buzzer off Connecting the Optional Printer To connect the Model 8925 printer to the ACCUBALANCE Plus locate the Printer Interface Cable supplied with the optional printer and connect the 9 pin ...

Page 42: ...ws printing of the entire memory or only the data stored within a particular Test ID To print data from memory press and hold the Left Handle Button This will initiate a countdown from 5 to 0 on the small display with PRNT on the large display When the small display shows 0 release the button If you release the key at any time other than 0 during the countdown nothing will print After the small di...

Page 43: ...statistics for each test ID and branch are provided The file containing the downloaded data is sorted and tab delimited to allow it to be imported into a spreadsheet for further data analysis To download data from the ACCUBALANCE Plus connect the supplied computer interface cable to the ACCUBALANCE Plus and to a computer serial port Any serial port from COM1 to COM4 can be used Change the current ...

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Page 45: ...damaged fabric or to order a different fabric size contact your local TSI distributor To determine who your local TSI distributor is you may call TSI toll free at 1 800 876 9874 If you wish to order a new hood fabric use the following part numbers shown in Table 5 Table 5 Hood Fabric Part Numbers Fabric Hood Size Part Number 2 ft x 2 ft 610 mm x 610 mm 800590 2 ft x 4 ft 610 mm x 1220 mm 800591 1 ...

Page 46: ... the instrument case or storage case needs cleaning wipe it off with a soft cloth and isopropyl alcohol or a mild detergent Never immerse the ACCUBALANCE Plus If the meter assembly of the ACCUBALANCE Plus becomes broken it must be replaced immediately to prevent access to hazardous voltage Calibration TSI recommends an annual calibration for the ACCUBALANCE Plus For a nominal fee TSI will calibrat...

Page 47: ...not connected Press ON OFF key Replace the batteries Clean the battery contacts Plug in battery holder flashing on display Low battery charge Dirty battery contacts Replace the batteries Clean the battery contacts 0 Flow is under range Trying to read too low a flow Object is blocking flow through ACCUBALANCE Plus Sensor grid tubes are plugged ACCUBALANCE Plus is not sealing around diffuser Flow ma...

Page 48: ...its measurement position too soon will cause errors ERR1 appears Temperature compensation sensor is damaged Unit is or was recently in ambient temperature outside of operating temperature Return to the factory for service Allow unit to stabilize in the operating temperature range of 32 140ºF 0 60ºC ERR2 appears The flow sensor is giving an erroneous reading Return to the factory for service ERR3 a...

Page 49: ...373 Symptom Possible Causes Corrective Action ERR6 appears Temperature sensor damaged Return to factory for service ERR7 appears Barometric pressure sensor damaged Return to factory for service ERR8 appears Flow direction sensor damaged Return to factory for service ...

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Page 51: ...ater back pressure due to the turbulence caused by the abrupt contraction In addition any apparatus within the hood such as supporting poles and the flow manifold also induces some frictional pressure drop Back pressure may cause slight errors in the flow measurements Figure 18 shows the pressure drop through the ACCUBALANCE Plus over its entire flow range As shown in the figure the back pressure ...

Page 52: ...air velocities in the duct ahead of the diffuser with and without the capture hood in place respectively With the known correction factor the back pressure corrected flow can be determined using Equation 2 Back pressure corrected flow Displayed flow x Cb 2 ...

Page 53: ...stems branches terminals Temperature Model 8373 only Range 32 140 F 0 60 C Resolution 1 F 0 1 C Accuracy 1 F 0 5 C Instrument Operating ConditionsAltitude up to 4000 meters Relative humidity up to 80 RH non condensing Pollution degree 1 in accordance with IEC 664 Weight using 2 ft 2 ft Hood 7 lb 6 oz 3 4 kg Power 4 C size batteries 4 alkaline batteries provided Battery Life At least 40 hours of co...

Page 54: ... 4 ft 610 mm 1220 mm 1 ft 4 ft 305 mm 1220 mm 1 ft 5 ft 305 mm 1525 mm 3 ft 3 ft 915 mm 915 mm RS 232C Output ASCII Character codes 1200 2400 4800 9600 and 19200 baud selectable No parity 8 data bits 1 stop bit No handshaking These specifications are subject to change without notice ...

Page 55: ...TSI Incorporated 500 Cardigan Road Shoreview MN 55126 U S A Web www tsi com ...

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