TSI Instruments AccuBalance 8370 Operation And Service Manual Download Page 1

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Model

8370

CCU

ALANCE

Flow Measuring Hood

Operation and Service

Manual

September

1998

P/N 1980145 Rev B

Summary of Contents for AccuBalance 8370

Page 1: ...Model 8370 ACCUBALANCE Flow Measuring Hood Operation and Service Manual September 1998 P N 1980145 Rev B...

Page 2: ......

Page 3: ...1998 P N 1980145 Rev B SHIP TO MAIL TO TSI Incorporated TSI Incorporated 500 Cardigan Road P O Box 64394 Shoreview MN 55126 St Paul MN 55164 U S INTERNATIONAL Sales Customer Service Sales Customer Ser...

Page 4: ...actory 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...

Page 5: ...veraging Mode 15 Selecting Flow Direction 16 Taking a Flow Measurement 16 Turning the ACCUBALANCE Off 17 Automatic Shut off 17 2 Operations in More Detail 19 Changing Hoods 19 Switching On the Power 2...

Page 6: ...cations 49 Tables 1 List of Components 5 1a List of Components Model 8370 3 6 1b List of Components Model 8370 5 6 2 DIP Switch Settings 32 3 Printout Examples 33 4 Hood Fabric Part Numbers 35 5 Troub...

Page 7: ...t x 3 ft Frame 25 12 ACCUBALANCE Lying Face Down 30 13 Location of DIP Switches 31 14 Flow Sensing Tube Out of Place 37 15 Pressure Drop Through the ACCUBALANCE 44 16 9 Pin RS 232 Serial Interface Con...

Page 8: ...iv...

Page 9: ...yed readout are represented in this manual by the typeface called Helvetica Narrow In addition to the different typeface displayed messages appear in quotes When reference is made to other sections of...

Page 10: ...2 About this manual...

Page 11: ...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 sens...

Page 12: ...4 Introduction...

Page 13: ...re missing or damaged notify TSI immediately Table 1 List of components Qty Item Part No 1 Model 8370 base 1081388 1 2 ft x 2 ft 610 mm x 610 mm hood fabric 1307060 6 Frame support poles 1081390 4 2 f...

Page 14: ...nents Model 8370 5 Qty Item Part No 1 Model 8370 base 1081388 1 2 ft x 2 ft 610 mm x 610 mm hood fabric 1307060 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 f...

Page 15: ...s at the front of this manual Please complete and mail it promptly it allows TSI to inform you of product updates Parts Identification Before proceeding with assembly and use of the ACCUBALANCE please...

Page 16: ...8 Chapter 1 Figure 2 ACCUBALANCE components 1 Hood fabric 2 Base 3 PRINT button in left handle 4 START HOLD button in right handle...

Page 17: ...NCE on and off PRINT Press to transmit the displayed flow rate measurement to the printer or other serial device Note that the button in the left handle performs the same function DATA PORT Printer or...

Page 18: ...ngs Note that the button in the right handle performs the same function AVG CONT Press to switch between the Averaging and the Continuous Reading Modes RETURN SUPPLY Press to switch between return air...

Page 19: ...UPPLY switch 4 Averaging mode The AVERAGE message will appear on the display when you have selected the three second or six second averaging mode See Averaging Mode section later in this chapter 5 Hol...

Page 20: ...fabric Insert one end of a support pole into its pole mount in the base of the ACCUBALANCE There is a cup in each corner of the frame to accept the other end of each support pole Helpful Hint This st...

Page 21: ...pole cup located in the corner of the fabric frame as shown in Figure 6 Figure 6 Installing a support pole 4 Insert the second support pole into the pole mount on the opposite side of the ACCUBALANCE...

Page 22: ...e inner side 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 co...

Page 23: ...o seconds by changing the setting of DIP Switch 7 For more details see Changing DIP Switch Settings in Chapter 2 The display continues to update until you press either the START HOLD switch on the key...

Page 24: ...e 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 towar...

Page 25: ...the ACCUBALANCE one foot clearance minimum However it is acceptable to have a hand supporting the flow hood at the bottom of the base Turning the ACCUBALANCE Off To turn off the ACCUBALANCE simply pre...

Page 26: ...18 Chapter 1...

Page 27: ...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...

Page 28: ...Notice Make sure that all support pole cups in the aluminum frame tubing pieces are facing downward Figure 7 Assembled 2 ft x 4 ft frame 2 Unfold the 2 ft x 4 ft hood fabric 3 Insert the frame into t...

Page 29: ...ntion to where the strap passes the handles 6 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...

Page 30: ...eck 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 an...

Page 31: ...le 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 cu...

Page 32: ...eces 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 al...

Page 33: ...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 str...

Page 34: ...an error is detected the display will show an error number Refer to Troubleshooting in Chapter 4 for interpretation of the error message If no errors are detected during start up the ACCUBALANCE will...

Page 35: ...s The flow rate can be held on the display by pressing the START HOLD switch on the keypad or the button in the right handle This is a valuable feature if you do not have the optional printer The hold...

Page 36: ...ur DIP switches 3 and 4 control the display units Refer to Changing DIP Switch Settings later in this chapter to change the flow units Selecting the Time Constant The ACCUBALANCE allows you to choose...

Page 37: ...ree second averaging mode You can change this by changing the setting of switch 6 in the battery compartment see Changing DIP Switch Settings Changing DIP Switch Settings You can change flow units and...

Page 38: ...e 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...

Page 39: ...re Detail 31 Figure 13 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 2 for...

Page 40: ...ery Warning When a battery power is running low the message LOW BATTERY will appear on the display NOTE The readings given by the ACCUBALANCE when LOW BATTERY is displayed are still valid Before the b...

Page 41: ...u find that the printer prints only question marks turn the printer off and then on again For details about how to operate the Model 8925 Portable Printer refer to the manual that was shipped with it...

Page 42: ...34 Chapter 2 Averaging Mode 3 sec Average 435 CFM 3 sec Average 1580 m3 hr 6 sec Average 132 l s...

Page 43: ...leaning 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 o...

Page 44: ...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...

Page 45: ...fold If any of the tubes are bent or damaged please contact TSI for repair information Calibration TSI recommends an annual calibration for the ACCUBALANCE For a nominal fee TSI will calibrate the uni...

Page 46: ...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 Shorevie...

Page 47: ...uses Corrective Action No display Unit not switched on Press ON OFF button Low or dead batteries Replace the batteries Dirty battery contacts Clean the battery contacts Battery holder not connected Pl...

Page 48: ...CE Flow reading fluctuates badly The flow is fluctuating Use a longer time constant ERR2 appears The flow sensor is giving an erroneous reading Return to the factory for service ERR1 appears Temperatu...

Page 49: ...is the desired measurement parameter The ACCUBALANCE automatically indicates standard flow readings There is therefore no need to apply a correction factor however if you wish to convert standard flo...

Page 50: ...low indicated on the ACCUBALANCE is 200 standard CFM Actual Flow Actual CFM 200 212 14 7 13 5 460 55 530 Example 2 Suppose your air flow temperature is 25 C and your local barometric pressure is 730 m...

Page 51: ...gh 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 additi...

Page 52: ...The back pressure correction factor Cb can be determined as follows Vo Cb 8 1 V where V and Vo are the average air velocities in the duct ahead of the diffuser with and without the capture hood in pla...

Page 53: ...ata pin 5 pin 3 receive data pin 6 pin 9 signal ground pin 7 pin 5 signal ground tied together pin 8 pin 8 busy no connection pin 4 Figure 16 9 pin RS 232 serial interface connections for Model 8925 P...

Page 54: ...your computer to receive data If you wish to connect the ACCUBALANCE to a computer which uses a 9 pin connector for serial communications an adapter may be used This is a standard 25 pin to 9 pin ada...

Page 55: ...all return vent the ACCUBALANCE will read slightly lower than the true flow At 80 CFM 40 l s for example the ACCUBALANCE will read low by 2 CFM 1 l s Therefore you may wish to add 2 CFM 1 l s when the...

Page 56: ...48 Appendix D...

Page 57: ...24 in 610 mm 610 mm 24 in 48 in 610 mm 1220 mm 12 in 48 in 305 mm 1220 mm 12 in 60 in 305 mm 1525 mm 36 in 36 in 915 mm 915 mm Power 4 C size batteries 4 alkaline batteries provided Battery Life At l...

Page 58: ...50 Appendix E...

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