Model 8371 Air Capture Hood Operation and Service Manual
Contents
1. y O lina 1 O O Figure 10 Location of DIP Switches You may change the switch settings using the tip of a ball point pen pencil compass small screwdriver or other small pointed object Refer to Table 4 for switch settings Operations in More Details 17 Table 4 DIP Switch settings Switch Number Setting Function 1 OFF J OFF Flow units CFM 1 OFF 2 ON Flow units m3 hr 1 ON 2 OFF Flow units l s 1 ON 2 ON Flow units m3 min OFF Pressure units in Hg ON Pressure units mm Hg F Temperature units F Temperature units C F Auto shut off on T Auto shut off off F Decimal for fractions comma for thousand l Comma for fraction decimal for thousand F Field calibration disabled l Field calibration enabled F Audible buzzer on Audible buzzer off Connecting the Optional Printer To connect the Model 8925 printer to the ACCUBALANCE locate the Printer Interface Cable supplied with the optional printer and connect the 9 pin end labeled PRINTER to the printer and the other end to the data port of the ACCUBALANCE The printer can be attached to the base of the ACCUBALANCE by clipping it into the printer bracket located to the left of the display The printer can also be easily used by clipping it to the belt of the user The printer must be set to the same baud rate as the ACCUBALANCE Always turn the ACCUBALANCE on before the printer If character2. 8 Chapter 1 Turning the AccuBALANCE Off To turn off the ACCUBALANCE simply press the ON OFF switch Automatic Shut off The ACCUBALANCE will automatically shut itself off if no switches or buttons have 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 DIP Switch Setting section of the next chapter m Set Up Chapter 2 Operations in More Detail This chapter presents more detail on the various features of the ACCUBALANCE and explains how to change fabrics and assemble different hood sizes The ACCUBALANCE will acknowledge that a key has been pushed by producing a beep This beep can be disabled as explained in the DIP Switch Settings Section of this chapter Keypad Functions ON OFF Press to toggle between having the instrument on and off 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 K FACTOR Volume measurements with the ACCUBALANCE is a means to take readings more quickly than methods used in the past However all capture hood devices are affected by various types of diffusers means of connecting the diffuser to the duct work and the type of duct work The ACCUBALANCE is calibrated by attaching it to a 2 foot x 2 foot 4 way throw diffuser In some circumstances it
3. Model 8371 ACCUBALANCE Air Capture Hood Operation and Service Manual November 1998 P N 1980335 Model 8371 ACCUBALANCE Air Capture Hood Operation and Service SHIP TO TSI Incorporated 500 Cardigan Road Shoreview MN 55126 U S Sales amp Customer Service 800 777 8356 651 490 2711 Fax 651 490 2874 Manual November 1998 P N 1980335 MAIL TO TSI Incorporated P O Box 64394 St Paul MN 55164 INTERNATIONAL Sales amp Customer Service 1 651 490 2711 Fax 1 651 490 2874 Copyright TSI Incorporated November 1998 All rights reserved Address TSI Incorporated 500 Cardigan Road P O Box 64394 St Paul MN 55164 USA Fax No 651 490 2874 Limitation of Warranty and Liability Seller warrants that this product under normal use and service as described in the operator s manual shall be free from defects in workmanship and material for a period of twenty four 24 months or the length of time specified in operator s manual from the date of shipment to the customer This limited warranty is subject to the following exclusions 1 Batteries hot wire or hot film sensors and certain other components when indicated in specifications are warranted for a period of 90 days from the date of shipment to the customer 2 With respect to any repair services rendered seller warrants that the parts repaired or replaced will be free from defects in workmanship and material unde
4. 5 ft frame 2 Unfold the 1 ft x 5 ft fabric hood Continue with steps 3 through 10 beginning on page 14 3 ft x 3 ft Hood To assemble and attach the 3 ft x 3 ft hood carefully follow these 10 steps 1 Build the 3 ft x 3 ft frame structure as shown in Figure 9 using four 2 ft aluminum frame tubing pieces four 1 ft aluminum frame tubing pieces four right angle tubing connectors and four straight 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 n A L ool Figure 9 Diagram of 3 ft x 3 ft frame 16 Chapter 2 2 Unfold the 3 ft x 3 ft fabric hood Continue with steps 3 through 10 beginning on page 14 Changing DIP Switch Settings You can change flow units and time constants 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 and lay down the instrument with the electronic meter facing down Remove the battery compartment cover by pulling up on the two latches You will see the switches numbered 1 through 8 in the corner of the battery compartment You may wish to remove or tilt up the battery pack to allow easier access to the switches The DIP switches are shown in Figure 10 e Joel z
5. frame kit contains all extra frame tubing and connectors required to build frames for the various size hoods The frame kit consists of the following parts 4 pieces 1 foot frame tubing 2 pieces 2 foot frame tubing 6 pieces straight tubing connectors 19 Meter The ACCUBALANCE has a built in electronic flow meter Do not try to detach the meter from the base The ACCUBALANCE should be used and stored within the specified temperature range 32 140 F 0 60 C The meter case display screen and membrane switch can be cleaned using a damp cloth with mild detergent solution Do not immerse the meter in water Wipe the meter dry before use Manifold If you observe 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 becomes damaged please contact TSI for repair information Cases If 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 If the meter face of the ACCUBALANCE becomes broken it must be replaced immediately to prevent access to hazardous voltage Calibration TSI recommends an annual calibration for the ACCUBALANCE For a nominal fee TSI will calibrate the unit and return it to you with a certificate of calibration and NIST tra
6. is necessary to traverse the ductwork to determine the true flow value This true value is then compared to the ACCUBALANCE This comparison is a K Factor or correction factor Press the K FACTOR key to toggle the K factor on or off The Ks symbol is shown on the display when the K factor is being used in the calculation Press and hold the K FACTOR key until the current K factor is displayed Release the key and use the or J key to change the factor Press ENTER to accept it and return to measuring mode The range of K factors allowed will be 0 1 to 2 00 The default value is 1 00 ACTUAL STANDARD Press the ACTUAL STANDARD key to toggle between displaying actual and standard flow rate STD or ACTUAL will light up on the display standard is the default Press and hold this key to view enter or change the barometric pressure and ambient temperature When the key is pressed and held the barometric pressure entered will be displayed Release the 11 key use the TJ keys to change the value and ENTER to accept it The ambient temperature will then be displayed Press the T or J 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 both TL when the parameter is displayed during power up TIME CONSTANT Press to display the current time constant Press WN to scroll through the time constant choices which are 1 s 3 s 5 s 1
7. 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 provides the highest degree of measurement accuracy even in non uniform flow conditions The ACCUBALANCE is temperature compensated to display a standard flow rate SCFM Std I s Std m hr and Std m min Standard flow rate is defined as the volumetric flow rate at standard conditions of 70 F 21 1 C and 14 7 pounds per square inch 760 mmHg barometric pressure Standard flow rate is the measurement used most often in ventilation applications m iii Chapter 1 Set Up This chapter guides you through unpacking setting up and getting started using your ACCUBALANCE See Chapter 2 for a detailed description of all operating features joo Figure 1 The ACCUBALANCE Unpacking 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 PartNo Model 8371 base 6 Frame support poles 108139 6 Right angle tubing connectors 1081584 Four 2 ft frame tubings and four of the right angle connectors are shipped assembled inside the top of the hood fabric Table 2 L
8. of the ACCUBALANCE base To remove the battery cover pull up on the latches located on the top and bottom of the cover 2 Place batteries in the battery holder located inside the battery compartment Follow the illustration on the battery holder for correct battery orientation 3 Replace the battery cover Notice that the battery cover is designed to fit only one way with the tab pointing toward the fabric Engage the latches by pressing down on them Remove batteries from the battery compartment during shipping travel and transport Jostling may jar the batteries loose and cause damage to the ACCUBALANCE If fresh new alkaline batteries are used the value will be near 100 percent when first turned on Other batteries such as NiCd batteries may show a lower value even when they are fully charged Notice The percent power remaining will not be accurate for NiCd batteries because they do not discharge linearly with power use Hood Assembly The ACCUBALANCE 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 of the ACCUBALANCE on the floor 2 Lift the top of the fabric Insert one end of a support pole into its pole mount in the base of the ACCUBALANCE There is a cup in 6 Chapter 1 each corner of the fr
9. of the display will be shown momentarily Below is a list of items that will appear on the display and their use Set Up 3 9 5 OBB ke OUNT aif 2 3 gt SAPE cea E SS OOOO Lj O T o ml X1000 1 i SS 6 7 Figure 3 Display of the Model 8371 1 Flow units CFM cubic feet per minute l s liters per second m hr cubic meters per hour and m min cubic meters per minute The ACCUBALANCE indicates flow already corrected to standard conditions Actual flow conditions can be shown by pressing the ACTUAL STANDARD key See Chapter 2 for more detail operation 2 Flow value Large digits See specifications for range and resolution 3 Message area Small digits 4 Flow direction arrows Indicates if supply or return air flow calibration is being utilized by the ACCUBALANCE Notice Be sure this arrow points in the direction of flow through the ACCUBALANCE otherwise the measurements made will be inaccurate To change the direction of the arrow press the RETURN SUPPLY key 5 SAMPLE will appear every time you press the SAMPLE button or the button on the top of the right handle 6 EP will appear along with a value on the display during power up to indicate the percent of battery life remaining 7 The symbol will flash when the batteries have only about 10 life remaining When the battery is too low to power the instrument LO is displayed momentarily before the instrument is automatic
10. 0 s 15 s 20 s Press ENTER to accept choice and return to measuring mode The default value is 1 s PRINT or LEFT HANDLE BUTTON Press to print the reading on the display to the portable printer N Press to scroll through choices Press both simultaneously to set barometric pressure and temperature when they are displayed during power up Used in field calibration mode for flow SAMPLE or RIGHT HANDLE BUTTON Press to take a sample averaged over the length of the time constant SAMPLE will flash on the display while the reading is being taken and then the value and SAMPLE will be held on the display until SAMPLE is pressed again at which time the instrument will return to measuring mode This also prints the result to the portable printer if connected LIGHT Press to toggle between having the back lit display turn on and off When the instrument is turned off the backlight turns off and does not automatically turn on the next time the instrument is turned on Field Calibration Turn DIP switch 7 to the on position see DIP Switch Settings Section later in the chapter To adjust the flow value press both the and J keys simultaneously When CAL is displayed release the keys Press P or y keys to change to a desired percentage adjustment and press ENTER to accept it The percentage adjustment ranges from 0 to plus or minus 12 5 To use the instrument with the adjusted values DIP switch 7 must remain in the ON pos
11. 2 ft aluminum frame tubing pieces four right angle tubing connectors and two straight 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 i al Figure 6 Diagram of 2 ft x 4 ft frame Operations in More Details 13 Unfold the 2 ft x 4 ft hood fabric Insert the frame into the fabric and fasten the fabric to the frame using the Velcro surfaces 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 inner surface of the frame structure When completed the soft rubber gasket material should lie in a straight line along the top surface of all four sides of the frame Notice Be sure to press the Velcro surfaces firmly together When 14 completed the hood fabric will be stretched fairly taut and will require good bonding of the fabric to the frame Stretch the cinch belt at the bottom of the fabric over the lip around the top of the molded plastic base of the ACCUBALANCE Align the seams of the fabric panels with the pairs of screw heads that hold the four pole mounts to the ACCUBALANCE base Align so that the cinch belt latch is on the side of the base opposite the electronics meter Pull the strap at the latch very tight to attach th
12. ARGES NO ACTION REGARDLESS OF FORM MAY BE BROUGHT AGAINST THE SELLER MORE THAN ONE YEAR AFTER THE CAUSE OF ACTION HAS ACCRUED The purchaser and all users are deemed to have accepted the terms of this LIMITATION OF WARRANTY AND LIABILITY which contains the complete and exclusive limited warranty of seller This LIMITATION OF WARRANTY AND LIABILITY may not be amended or modified nor may any of its terms be waived except by a writing signed by an authorized representative of seller Service Policy Knowing that inoperative or defective instruments are as detrimental to TSI as they are to our customers our service 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 TSI s Customer Service department at 651 490 2711 or 800 777 8356 ABOUT THIS MANUAL 505 II INTRODUCTION viii era III CHAPTER 1 SEKUR a a 1 UnpackiNd agaaa aaa a aa a a a a a 1 O S 2 Parts dni AO curras 3 Display occiso tes ees ee bestest ODA D a 3 Display UNIS oia anaes aise Gi 5 KV DAG TETEE ARAE E tess assesses esa ase 5 Preparing the Instrument for Use 6 Installing the BAatt ri S ccccccccssesssseeeeeeeetteeesnseeees 6 Hood ASSOMDIY coooocccccccccnacoconaccnoncconananona nono naco nnnanarnn cnn 6 Basic Operation 7 SartUPiiionanacan it ai 7 Selecting Flow DirectiON oooooooccccccnnccoconccconncononanonanccnnos 8 Taking a Flow MeasureMe
13. Relative humidity up to 80 RH non condensing Pollution degree 1 in accordance with IEC 664 7 lb 6 oz 3 4 kg 4 C size batteries 4 alkaline batteries provided At least 40 hrs of continuous use 26 in x 26 in x 7 in 660 mm x 660 mm x 180 mm 2 ft x 2 ft 610 mm x 610 mm 2 ft x 4 ft 610 mm x 1220 mm 1 ft x 4 ft 305 mm x 1220 mm 1 ft x 5 ft 305 mm x 1525 mm 3 ft x 3 ft 915 mm x 915 mm ASCII Character codes 1200 Baud No parity 8 data bits 1 stop bit No handshaking These specifications are subject to change without notice 25
14. alled Helvetica Narrow 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 Example The SAMPLE message will appear along with a flow value after you have activated the SAMPLE button 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 please call TSI s Environmental Measurements and Control Division at 651 490 2711 or 800 777 8356 Product application notes are designed to provide more information on the product to the user Application notes as well as other related material can be obtained by calling TSI or by visiting the TSI web site at http www tsi com m Introduction The TSI Model 8371 ACCUBALANCE is an instrument designed to measure the air flow from diffusers and grilles or the air flow entering exhaust outlets The ACCUBALANCE is lightweight and easy to use The instrument can display the measured air flow in four different units standard cubic feet per minute SCFM standard liters per second Std 1 s standard cubic meters per hour Std m hr and standard cubic meters per minute Std m min All readings may also be displayed in actual flow conditions The ACCUBALANCE consists of a fabric hood a molded plastic base which contains an electronic meter and a flow sensing manifold
15. ally turned off 4 Chapter 1 8 STD or ACTUAL will be displayed at all times STD refers to readings that are based on standard conditions of 29 92 in Hg 760 mm Hg and 70 F 21 1 C ACTUAL refers to readings that are converted to local conditions based on temperature and barometric pressure See Chapter 2 for more details 9 Ke K factor symbol to indicate that the readings have an adjustment factored in Display Units The ACCUBALANCE is shipped with cubic feet per minute CFM as the default flow unit unless the metric version was ordered If you wish to change the units to I s liters per second m hr cubic meters per hour or m min cubic meters per minute see Changing DIP Switch Settings in Chapter 2 Keypad Below is a drawing of the keypad Figure 4 for the Model 8371 The keys are referenced in the Basic Operation section of this chapter and in Chapter 2 Operations in More Detail AcCUBALANCE SAMPLE DATA PORT ACTUAL STANDARD TIME ONOFF CONSTANT Figure 4 Keypad for the Model 8371 1 pl Imill Set Up 5 Preparing the Instrument for Use Installing the Batteries The ACCUBALANCE requires four C size batteries to operate For your convenience four alkaline batteries are included with the ACCUBALANCE To install the batteries follow these three steps 1 Remove the battery cover located behind the electronic meter on the inner side
16. ame to accept the other end of each support pole Helpful Hint This step is made simpler by temporarily resting the opposite corner of the fabric top on a table edge 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 corner of the fabric frame as shown in Figure 5 Rod to pole cup Figure 5 Installing a support pole 4 Insert the second support pole into the pole mount on the opposite side of the ACCUBALANCE base 5 Repeat step 3 for the second support pole 6 Repeat steps 4 and 5 for the remaining two support poles Basic Operation Start Up Press the ON OFF button on the meter to turn on the power The display will initially indicate the percent of battery power remaining During start up the ACCUBALANCE performs a self test of its electronic functions If an error is found an error message will appear on the display Refer to Chapter 4 Troubleshooting 1f an error message Set Up 7 appears If no errors are found the ACCUBALANCE will proceed to the continuous measurement mode Selecting Flow Direction Each ACCUBALANCE is calibrated for supply and return air separately for increased accuracy The ACCUBALANCE will assume that air is flowing in the same direction as the arrow on the right hand side of the display Be sure this arrow points in the direction of flow through the ACCUBALANCE otherwise measurements will be inaccurate To change th
17. ceability This annual checkup assures you of consistently accurate readings To calibrate the ACCUBALANCE please ship TSI the complete package that includes the meter the base the manifold and any fabrics used Everything should be packed carefully within the ACCUBALANCE carrying case and then inside a proper shipping box such as the original shipping box Ship directly to TSI Inc ATTN Customer Service 500 Cardigan Road Shoreview MN 55126 3996 20 Chapter 3 Chapter 4 Troubleshooting Table 6 lists the symptoms possible causes and recommended solutions for common problems encountered with the ACCUBALANCE If your symptom is not listed or if none of the solutions solves your problem please contact TSI Table 6 Troubleshooting the AccuBALANCE Symptom Possible Causes Corrective Action No display the display 0 Flow is under range Unit not switched on Low or dead batteries Dirty battery contacts Battery holder not connected Low battery charge Dirty battery contacts Trying to read too low a flow Object is blocking flow through ACCUBALANCE Sensor grid tubes are plugged ACCUBALANCE is not sealing around diffuser Press ON OFF button Replace the batteries Clean the battery contacts Plug in battery holder Replace the batteries Clean the battery contacts Flow may not be measurable using the ACCUBALANCE Remove obstruction Clean the tubes Reposition the ACCUBALANCE
18. e direction of the arrow press the RETURN SUPPLY switch Taking a Flow Measurement You are now ready to start measuring flow rates First turn on the ACCUBALANCE and select the appropriate flow direction For measuring supply air flow the arrow must point down away from the hood fabric for return air flow measurements the arrow must point up toward the hood fabric Press the top of the ACCUBALANCE against the perimeter edge of the diffuser or grille so as to form a seal The ACCUBALANCE will begin to display values on a continuous basis When you are ready to read a value press the SAMPLE button or the button on the top of the right 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 unit will beep and 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 adjust the TIME CONSTANT to a slower value Changing the TIME CONSTANT is detailed in the Keypad Function Section of Chapter 2 When making a flow measurement keep objects out of the flow path at the base of the ACCUBALANCE one foot clearance minimum However it is acceptable to have a hand supporting the air capture hood at the bottom of the base Notice You must keep the ACCUBALANCE in place during the entire sample interval and until the time averaged measurement appears on the display
19. e fabric to the base Make sure that the strap stays tucked under the protruding lip all around the top of the base Pay particular attention to where the strap passes the handles Now it is time to install the support poles You will find four white marks on the inside top edge of the fabric These marks identify the location of cups on the underside of the frame tubing that will accept the ends of the support poles At this time it is helpful to be near a table or some other thigh high surface to help hold up the fabric while you install the first support pole With the base of the ACCUBALANCE on the floor lift the fabric frame up so that a white mark is directly in front of you Support the opposite side of the frame structure on a nearby table or other level surface Take one support pole and insert one end into its pole mount in the ACCUBALANCE base Bend the pole slightly to guide the other end into the corresponding support pole cup located on the underside of the frame near the white mark on the fabric Chapter 2 S Repeat step 7 until all four support poles are installed 9 Now that the hood is assembled and the fabric is stretched tight it is a good practice to check the rubber gasket around the top edge of the ACCUBALANCE 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 Final
20. ist of components 3 Hood Kit adds 2 hoods to the base kit Qty Item PartNo 6 2ft 610mm frametubing 1081262 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 Item Cs Parno 2 Included with every manual is a registration card Look for yours at the front of this manual Please complete and mail it promptly it allows TSI to 2 Chapter 1 inform you of product updates You may also register on line by visiting the TSI web site Parts Identification Before proceeding with assembly and use of the ACCUBALANCE please familiarize yourself with the various parts of the instrument Refer to tables 1 through 3 for part descriptions and Figure 2 for general location of major items Figure 2 ACCUBALANCE components 1 Fabric hood Basic hood assembly is covered later in this chapter other hoods are discussed in Chapter 2 2 Right handle with SAMPLE button 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 printing of data 6 Left handle with PRINT button Used to print that which is on the display value to the portable printer Display Each time the ACCUBALANCE is turned on all segments
21. ition 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 12 Chapter 2 Changing Hoods The ACCUBALANCE is shipped with a 2 ft x 2 ft hood attached to the base Four other hood sizes are available from TSI and can be purchased separately Available hood sizes are identified by the dimensions of the frame structure at the top of the hood and include 2 ft x 4 ft 1 ft x 4 ft 1 ft x 5 ft and 3 ft x 3 ft To change hood sizes first remove the hood currently attached to the base To remove the attached hood first unlatch the cinch belt where the fabric is attached to the base Then remove the fabric from its frame structure by peeling back the Velcro from the 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 carrying case It is a good idea to fold the fabric so that the tag identifying its size remains visible for future reference 2 ft x 4 ft Hood To assemble and attach the 2 ft x 4 ft hood carefully follow these 10 steps 1 Build the 2 ft x 4 ft frame structure as shown in Figure 6 using six
22. l ooooccccccccncconocinonicononanannnonnns 8 Turning the ACCUBALANCE Off ooooccccccncconoccconcccconncannncnnns 9 Automatic SHUEO Fisica 9 2 OPERATIONS IN MORE DETAIL 0 eeeseeeeees 11 Keypad Functions mis ien A A A A A 11 Field GalibratiO viiiiida aad 12 Ghanging Ho0ddS 2Rdci A A AAA A a 13 Changing DIP Switch Settings 17 Setting FUNCION viii 18 Connecting the Optional Printer eeens 18 3 MAINTENANCE coat e e 19 Fabric Ho0d Siete erie ada a a alia as 19 A NN 19 MOtOliicsociotacotacacdesicacaducadanol ocn dacad cedunaloaloeedsaudanad es a a 20 Manifold siessen cutanes ond a ced sand taeeeed eed a Aa ia 20 CASCS eheteceetsaedegatace laced anda a E A Lo a a 20 Calibration naccceatesecepedeges cooler o0h saec saat ces peteaue aabvcobeeltadauls 20 4 TROUBLESHOOTING 00 cccceccccecceeeeeeeeeeeeesteneeeeees 21 APPENDICES A BACK PRESSURE cic 0do codec ita 23 B SPECIFICATIONS 0occocoocccooooocccccccccononannnnccnnnnconannnn nn ccnnnns 25 CONTENTS About this manual This manual explains how to set up operate and maintain the Model 8371 ACCUBALANCE Air Capture Hood Read it thoroughly before using the instrument Formatting and Typography Note that step by step instructions are numbered in boldface type 1 2 3 etc set flush left against the margin References to the front panel keys on the ACCUBALANCE along with the instrument s displayed readout are represented in this manual by the typeface c
23. ly at the corners tuck the straight rubber gasket flaps under the edges cut at an angle This will create a virtually leak free soft pliant seal 1 ft x 4 ft Hood To assemble and attach the 1 ft x 4 ft hood carefully follow these 10 steps 1 Build the 1 ft x 4 ft frame structure as shown in Figure 7 using four 2 ft aluminum frame tubing pieces two 1 ft aluminum frame tubing pieces four right angle tubing connectors and two straight 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 A II E SES Et Figure 7 Diagram of 1 ft x 4 ft frame 2 Unfold the 1 ft x 4 ft fabric hood Continue with steps 3 through 10 beginning on page 14 1 ft x 5 ft Hood To assemble and attach the 1 ft x 5 ft hood carefully follow these 10 steps 1 Build the 1 ft x 5 ft frame structure as shown in Figure 8 using four 2 ft aluminum frame tubing pieces two 1x tube connectors two 1 ft aluminum frame tubing pieces and four right angle tubing Operations in More Details 15 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 L Figure 8 Diagram of 1 ft x
24. onal pressure drop Back pressure may cause slight errors in the flow measurements Figure 11 shows the pressure drop through the ACCUBALANCE over its entire flow range As shown in the Figure the back pressure is only 0 05 in HO ata flow rate as high as 1000 CFM Liters Sec 250 500 750 0 20 sa 0 15 0 3 Pressure mmHg Drop 0 10 0 2 gt nches H20 0 05 0 1 0 0 500 1000 1500 7 2000 Flow CFM Figure 11 Pressure Drop through the AccuBALANCE If you wish to make back pressure corrections you must first determine the back pressure correction factor Cp The back pressure correction factor Cp can be determined as follows 23 Ga 1 where V and V are the average 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 Ch 2 24 Appendix A Appendix B Specifications Flow Range Accuracy Operating Temperature Range Instrument Operating Conditions Weight using 2 ft x 2 ft in Hood Power Battery Life Carrying Case Hood Sizes Available Standard Optional RS 232C Output 30 2 000 CFM 15 0 1 000 l s 50 3 500 m hr 0 84 55 0 m min 5 reading 5 CFM 5 reading 2 4 l s 5 reading 8 5 m hr 5 reading 0 15 m min 32 140 F 0 60 C Altitude up to 13 000 ft 4000 meters
25. r normal use for a period of 90 days from the date of shipment to the customer 3 Seller does not provide any warranty on finished goods manufactured by others Only the original manufacturer s warranty applies 4 Unless specifically authorized in a separate writing by seller seller makes no warranty with respect to and shall have no liability in connection with any goods which are incorporated into other products or equipment by the Buyer All goods returned under warranty shall be at the Buyer s risk of loss Seller s factory prepaid and will be returned at the Seller s risk of loss Buyer s factory prepaid THE FOREGOING IS IN LIEU OF ALL OTHER WARRANTIES AND IS SUBJECT TO THE CONDITIONS AND LIMITATIONS STATED HEREIN NO OTHER EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR PARTICULAR PURPOSE OR MERCHANTABILITY IS MADE THE EXCLUSIVE REMEDY OF THE USER OR PURCHASER AND THE LIMIT OF THE LIABILITY OF SELLER FOR ANY AND ALL LOSSES INJURIES OR DAMAGES IN CONNECTION WITH THIS PRODUCT INCLUDING CLAIMS BASED ON CONTRACT NEGLIGENCE STRICT LIABILITY OTHER TORT OR OTHERWISE SHALL BE THE RETURN OF THE PRODUCT TO THE FACTORY OR DESIGNATED LOCATION AND THE REFUND OF THE PURCHASE PRICE OR AT THE OPTION OF SELLER THE REPAIR OR REPLACEMENT OF THE PRODUCT IN NO EVENT SHALL SELLER BE LIABLE FOR ANY SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES SELLER SHALL NOT BE RESPONSIBLE FOR INSTALLATION DISMANTLING REASSEMBLY OR REINSTALLATION COSTS OR CH
26. s reset it by turning it off and Alien on again If Eces refer to the Model 8925 Portable Printer Operation and Service Manual Caution This symbol is used to indicate that the data port of the ACCUBALANCE is not intended for connection to a public telecommunications network Connect the data port only to another RS232 port 18 Chapter 2 Chapter 3 Maintenance The ACCUBALANCE is designed for long term field use If the ACCUBALANCE is used with reasonable care it should be able to make precise measurements over a long time period Some of the components can be cleaned periodically When cleaning the components please follow the instructions given below Fabric Hood The hoods can be washed with mild detergent and cold water When washing the hood keep the hood away from objects with sharp corners or sharp edges Careless cleaning may cause damage If the fabric gets ripped it should be replaced or repaired Duct tape can be placed over the rip on both sides of the fabric for temporary repair To replace a damaged fabric or to order a different fabric size contact TSI for replacement fabric information If you wish to order a new hood fabric use the following part numbers shown in Table 5 Table 5 Hood Fabric Part Numbers 3 ft x 3 ft 915 mm x 915 mm 800593 1 ft x 5 ft 305 mm x 1525 mm 800594 1081263 It is recommended that you purchase a frame kit whenever you purchase a hood other than the 2 ft x 2 ft size The
27. to form a seal OVER Flow is over range Trying to read too high a flow Flow may not be measurable using the ACCUBALANCE 21 22 Symptom Possible Causes Corrective Action Flow reading fluctuates badly ERR1 appears ERR2 appears ERR3 appears The flow is fluctuating Unit is or was recently in ambient temperature outside of operating temperature Temperature compensation sensor is damaged The flow sensor is giving an erroneous reading The ACCUBALANCE has detected a calibration fault Use a longer time constant Allow unit to stabilize in the operating temperature range of 32 140 F 0 60 C Return to the factory for service Return to the factory for service Return to the factory for service Chapter 4 Appendix A Back Pressure It is commonly known that an air capture hood may induce a back pressure In general back pressures are caused by restrictions in the flow path as well as frictional pressure losses In order to improve accuracy and sensitivity all air capture hoods incorporate a contracted flow section The contracted section restricts the flow through the hood which induces a back pressure A hood having a more abrupt contraction than the ACCUBALANCE may induce greater 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 fricti
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