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