TSI Instruments ACCUBALANCE 8371 Operation manual

ACCUBALANCE®
AIR CAPTURE HOOD
MODEL 8371
OPERATION AND SERVICE MANUAL
1980335, REVISION E
FEBRUARY 2013

iii
Copyright©
TSI Incorporated / 2002-2013 / All rights reserved.
Address
TSI Incorporated / 500 Cardigan Road / Shoreview, MN 55126 / USA
Fax No.
[phone]
LIMITATION OF WARRANTY AND LIABILITY (effective June 2011)
(For country-specific terms and conditions outside of the USA, please visit www.tsi.com.)
Seller warrants the goods sold hereunder, under normal use and service as described in the operator's
manual, shall be free from defects in workmanship and material for 24 months, or if less, the length of time
specified in the operator's manual, from the date of shipment to the customer. This warrantyperiod is
inclusive of any statutory warranty. This limited warranty is subject to the following exclusions and
exceptions:
a. Hot-wire or hot-film sensors used with research anemometers, and certain other components when
indicated in specifications, are warranted for 90 days fromthe date of shipment;
b. Pumps are warranted for hours of operation as set forth in product or operator’s manuals;
c. Parts repaired or replaced as a result of repair services are warranted to be free from defects in
workmanship and material, under normal use, for 90 days from the date of shipment;
d. Seller does not provide any warranty on finished goods manufactured by others or on any fuses,
batteries or other consumable materials. Onlythe original manufacturer's warrantyapplies;
e. 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 into other products or
equipment, or which are modified by any person other than Seller.
The foregoing is 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. WITH RESPECT TO SELLER’S BREACH OF THE IMPLIED WARRANTY
AGAINST INFRINGEMENT, SAID WARRANTY IS LIMITED TO CLAIMS OF DIRECT INFRINGEMENT
AND EXCLUDES CLAIMS OF CONTRIBUTORY OR INDUCED INFRINGEMENTS. BUYER’S
EXCLUSIVE REMEDY SHALL BE THE RETURN OF THE PURCHASE PRICE DISCOUNTED FOR
REASONABLE WEAR AND TEAR OR AT SELLER’S OPTION REPLACEMENT OF THE GOODS WITH
NON-INFRINGING GOODS.
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 ONCONTRACT, NEGLIGENCE, TORT,
STRICT LIABILITY OR OTHERWISE) SHALL BE THE RETURN OF GOODS TO SELLER AND THE
REFUND OF THE PURCHASE PRICE, OR, AT THE OPTION OF SELLER, THE REPAIR OR
REPLACEMENT OF THE GOODS. IN THE CASE OF SOFTWARE, SELLER WILL REPAIR OR REPLACE
DEFECTIVE SOFTWARE OR IF UNABLE TO DO SO, WILL REFUND THE PURCHASE PRICE OF THE
SOFTWARE. IN NO EVENT SHALL SELLER BE LIABLE FOR LOST PROFITS OR ANY SPECIAL,
CONSEQUENTIAL OR INCIDENTAL DAMAGES. SELLER SHALL NOT BE RESPONSIBLE FOR
INSTALLATION, DISMANTLING OR REINSTALLATION COSTS OR CHARGES. No Action, regardless of
form, may be brought against Seller more than 12 months after a cause of action has accrued. The goods
returned under warrantyto Seller's factory shall be at Buyer's risk of loss, and will be returned, if at all, at
Seller's risk of loss.
Buyer and all users are deemed to have accepted 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, modified or its terms waived, except bywriting signed by an Officer 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 [phone] (USA) or (001 651) 490-2811 (International) or visit www.tsi.com.
Trademarks
TSI®, TSI logo, and AccuBalance®are trademarks of TSI Incorporated.

iv
CONTENTS
ABOUT THIS MANUAL............................................................................V
Formatting and Typography ...............................................................v
INTRODUCTION......................................................................................VI
SET UP .....................................................................................................1
Unpacking...........................................................................................1
Item.....................................................................................................2
Parts Identification..............................................................................3
Display..........................................................................................3
Display Units................................................................................5
Keypad.........................................................................................5
Preparing the Instrument for Use .......................................................6
Installing the Batteries..................................................................6
Hood Assembly............................................................................6
Basic Operation..................................................................................8
Start-Up........................................................................................8
Selecting Flow Direction ..............................................................8
Taking a Flow Measurement........................................................8
Turning the AccuBalance®Air Capture Hood Off.........................9
Automatic Shut-off........................................................................9
OPERATIONS IN MORE DETAIL..........................................................11
Keypad Functions.............................................................................11
Field Calibration................................................................................12
Changing Hoods...............................................................................13
Changing DIP Switch Settings..........................................................17
Setting: Function..............................................................................18
Connecting the Optional Printer .......................................................19
MAINTENANCE......................................................................................21
Fabric Hood......................................................................................21
Part Number .....................................................................................21
Meter.................................................................................................22
Manifold............................................................................................22
Cases................................................................................................22
Calibration.........................................................................................22
TROUBLESHOOTING............................................................................23
BACK PRESSURE.................................................................................25
SPECIFICATIONS..................................................................................27

v
About this Manual
This manual explains how to set up, operate and maintain the
AccuBalance®Air Capture Hood Model 8371. 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®capture hood,
along with the instrument's displayed 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 the manual, the section title
is italicized.
Example: The "SAMPLE" message appears along with a flow value after
the SAMPLE button has been activated (from Display in Chapter 1).
HELP!
For technical assistance with this instrument, questions about the
manual, or if your air capture hood needs repair or recalibration, please
call TSI Customer Service at [phone] or [phone]. 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.

vi
Introduction
The TSI Model 8371 AccuBalance®capture hood is an instrument
designed to measure the air flow from diffusers and grilles or the air flow
entering exhaust outlets. The AccuBalance®capture hood 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 l/s), standard cubic meters per hour (Std m3/hr),
and standard cubic meters per minute (Std m3/min). All readings may
also be displayed in actual flow conditions.
The AccuBalance®capture hood consists of a fabric hood, a molded
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®capture hood
provides the highest degree of measurement accuracy, even in non-
uniform flow conditions.
The AccuBalance®capture hood is temperature-compensated to display
a standard flow rate: SCFM, Std l/s, Std m3/hr, and Std m3/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.
C A U T I O N
WHILE USING THE ACCUBALANCE®AIR BALANCING
INSTRUMENT TO TEST 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
CONTAMINANTS,ALWAYS USE AN APPROPRIATE MASK
OR RESPIRATOR WHILE EMPLOYING THE ACCUBALANCE®
AIR BALANCING INSTRUMENT.

1
Chapter 1
Set Up
This chapter guides you through unpacking, setting up, and getting
started using your AccuBalance®Air Capture Hood. See Chapter 2 for a
detailed description of all operating features.
Figure 1: The AccuBalance®Air Capture Hood
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.

Chapter 1
2
Table 1 List of components
Qty
Item
Part No.
1
Model 8371 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 angle tubing connectors*
1081584
1
Battery holder
1081279
4
C-size batteries
1208018
1
Battery compartment cover
1081458
1
Carrying case
1319067
1
Operation and Service Manual
1980335
*Four 2 ft frame tubings and four of the right angle connectors are shipped
assembled inside the top of the hood fabric.
Table 2 List of components: -3 Hood Kit (adds 2 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
6
2 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 x 915 mm) hood fabric
1801068
6
2 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
2
1x tube connectors
1081580
Be sure to register your instrument, it allows TSI to inform you of product
updates. To register, visit the TSI web site (http://register.tsi.com/).

Set-Up
3
Parts Identification
Before proceeding with assembly and use of the AccuBalance®capture
hood, please become familiar 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
1Fabric hood - Basic hood assembly is covered later in this chapter,
other hoods are discussed in Chapter 2.
2Right handle with SAMPLE button - used for capturing information on
the display.
3Meter base.
4Electronic meter and display - Detailed keypad functions are
covered in Chapter 2.
5Printer bracket - Allows the portable printer to be attached to the
AccuBalance®base for ease of use and printing of data.
6Left handle with PRINT button - Used to print that which is on the
display value to the portable printer.
Display
Each time the AccuBalance®capture hood is turned on, all
segments of the display will be shown momentarily. Below is a list
of items that will appear on the display and their use.
1
6
5
2
3
4

Chapter 1
4
Figure 3: Display of the Model 8371
1Flow units: CFM (cubic feet per minute), l/s (liters per
second), m3/hr (cubic meters per hour), and m3/min (cubic
meters per minute). The AccuBalance®capture hood
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)
2Flow value: Large digits. See specifications for range and
resolution.
3Message area: Small digits.
4Flow direction arrows: Indicates if supply or return air flow
calibration is being utilized by the AccuBalance®capture
hood.
Notice: Be sure this arrow points in the direction of flow through the
AccuBalance®capture hood,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 the SAMPLE button or the
button on the top of the right handle is pressed.
6“% ” 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 automatically turned off.
3
2
5
9
8
4
1
6, 7

Set-Up
5
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“Kf”: K factor symbol to indicate that the readings have an
adjustment factored in.
Display Units
The AccuBalance®capture hood is shipped with cubic feet per
minute (CFM) as the default flow unit (unless the metric version was
ordered). To change the units to l/s (liters per second), m3/hr (cubic
meters per hour), or m3/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.
Figure 4: Keypad for the Model 8371

Chapter 1
6
Preparing the Instrument for Use
Installing the Batteries
The AccuBalance®capture hood requires four C-size batteries to
operate. For convenience, four alkaline batteries are included with
the AccuBalance®capture hood.
To install the batteries, follow these three steps:
1Remove the battery cover located behind the electronic meter on
the inner side of the AccuBalance®capture hood base. To
remove the battery cover, pull up on the latches located on the
top and bottom of the cover.
2Place batteries in the battery holder located inside the battery
compartment. Follow the illustration on the battery holder for
correct battery orientation.
3Replace 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.
Notice: Remove batteries from the battery compartment during shipping,
travel and transport. Jostling may jar the batteries loose and
cause damage to the AccuBalance®capture hood.
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®capture hood is shipped from the factory
partially assembled with the 2 ft x 2 ft nylon hood attached to the
base. 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:
1Place the base of the AccuBalance®capture hood on the floor.

Set-Up
7
2Lift the top of the fabric. Insert one end of a support pole into its
pole mount in the base of the AccuBalance®capture hood.
There is a cup in each corner of the frame 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.
3Grasp 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.
Figure 5: Installing a Support Pole
4Insert the second support pole into the pole mount on the
opposite side of the AccuBalance®capture hood base.
5Repeat step 3 for the second support pole.
6 Repeat steps 4 and 5 for the remaining two support poles.
Rod to pole
cup

Chapter 1
8
Basic Operation
C A U T I O N
WHILE USING THE ACCUBALANCE®AIR BALANCING
INSTRUMENT TO TEST 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
CONTAMINANTS,ALWAYS USE AN APPROPRIATE MASK
OR RESPIRATOR WHILE EMPLOYING THE ACCUBALANCE®
AIR BALANCING INSTRUMENT.
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®capture hood 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, if an
error message appears. If no errors are found, the AccuBalance®
capture hood will proceed to the continuous measurement mode.
Selecting Flow Direction
Each AccuBalance®capture hood is calibrated for supply and return
air separately for increased accuracy. The AccuBalance®capture
hood 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®capture
hood, otherwise measurements will be inaccurate. To change the
direction of the arrow press the RETURN/SUPPLY button.
Taking a Flow Measurement
You are now ready to start measuring flow rates. First, turn on the
AccuBalance®capture hood 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®capture hood against the
perimeter edge of the diffuser or grille so as to form a seal.

Set-Up
9
The AccuBalance®capture hood 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®capture hood (one foot
clearance minimum). However, it is acceptable to have a hand
supporting the air capture hood at the bottom of the base.
Notice: The AccuBalance®capture hood must be kept in place
during the entire sample interval and until the time-averaged
measurement appears on the display.
Turning the AccuBalance®Air Capture Hood Off
To turn off the AccuBalance®capture hood, simply press the
ON/OFF button.
Automatic Shut-off
The AccuBalance®capture hood 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.

Chapter 1
10
(This page intentionally left blank)

11
Chapter 2
Operations in More Detail
This chapter presents more detail on the various features of the
AccuBalance®capture hood and explains how to change fabrics and
assemble different hood sizes. The AccuBalance®capture hood 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®capture hood 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®capture hood is calibrated by attaching it to a
2 foot x 2 foot, 4 way throw diffuser. In some circumstances it is
necessary to traverse the ductwork to determine the “true” flow value.
This true value is then compared to the AccuBalance®capture hood.
This comparison is a K Factor or correction factor.
Press the K FACTOR button to toggle the K factor on or off. The “Kf”
symbol is shown on the display when the K factor is being used in the
calculation. Press and hold the K FACTOR button until the current K factor
is displayed. Release the button and use the or button 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 button 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 button to view, enter, or
change the barometric pressure and ambient temperature. When the
button is pressed and held, the barometric pressure entered will be

Chapter 2
12
displayed. Release the button, use the  buttons to change the value
and ENTER to accept it. The ambient temperature will then be displayed.
Press the or button 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  when the parameter is
displayed during power-up.
TIME CONSTANT
Press to display the current time constant. Press  to scroll through
the time constant choices, which are 1 s, 3 s, 5 s, 10 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.

Press to scroll through choices. Press either or 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 
buttons simultaneously. When “CAL” is displayed, release the buttons.
Press either the or buttons 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 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.

Operations in More Details
13
Changing Hoods
The AccuBalance®capture hood is shipped with a 2 ft x2 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 x4 ft, 1 ft x4 ft, 1 ft x5 ft and 3 ft x3 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 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 x4 ft Hood
To assemble and attach the 2 ft x4 ft hood, carefully follow these
10 steps:
1Build the 2 ft x4 ft frame structure as shown in Figure 6 using six
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.

Chapter 2
14
Figure 6: Diagram of 2 ft x 4 ft frame
2Unfold the 2 ft x4 ft hood fabric.
3Insert 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
completed, the hood fabric will be stretched fairly taut and will
require good bonding of the fabric to the frame.
4Stretch the cinch belt at the bottom of the fabric over the lip around
the top of the molded plastic base of the AccuBalance®capture
hood. 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.
5Pull the strap at the latch very tight to attach the 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.