TSI Incorporated Alnor CompuFlow 8570, Alnor CompuFlow 8571 Owner's Manual

OWNER’S MANUAL

CompuFlow®

Thermo-anemometer

Model 8570/8571

WARRANTY

Copyright

TSI Incorporated / July 2002 / All rights reserved

Address

TSI Incorporated, Alnor Products, 500 Cardigan Road, Shoreview, MN 55126 USA

Toll-free: [phone] Phone: [phone] Fax: [phone]

LIMITATION OF WARRANTY AND LIABILITY. 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 twenty-four (24) months, or the length of time specified in the operator's manual, from the
date of shipment to the customer. This warranty period is inclusive of any statutory warranty. This limited
warranty is subject to the following exclusions:

a. Hot-wire or hot-film sensors used with research anemometers, and certain other components when

indicated in specifications, are warranted for 90 days from the date of shipment.

b. 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.

c. Seller does not provide any warranty on finished goods manufactured by others or on any fuses,

batteries or other consumable materials. Only the original manufacturer's warranty applies.

d. 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.

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 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 NO EVENT SHALL SELLER BE
LIABLE FOR 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 warranty to 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 by writing
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 Customer Service at [phone]
(USA) and (1) 651-490-2811 (International).

TABLE OF CONTENTS

1. General Description .................................................2

2. Theory of Operation: Thermo-anemometers ...........2

3. Safety .......................................................................3

4. About the Instrument ...............................................3

5. Getting Started .........................................................4

6. Detailed Operation...................................................5

7. Troubleshooting .......................................................8

8. Maintenance.............................................................8

9. Service Information .................................................9

SECTION 1

General Description

The CompuFlow Model 8570/8571 thermo-anemometer is a hand-held, battery powered,
microprocessor-based instrument capable of measuring either air velocity or temperature.
This digital instrument measures velocities from 0 to 9999 ft/min (0 to 50 m/s). The
instrument accepts up to 1871 readings and displays the average on demand. The thermo­anemometer provides steady digital readings and quick response, due to time-weighted
averaging software. Readings are available in both English and metric units by changing
the position of the DIP switches. To allow for maximum long-term accuracy, this
instrument is electronically calibrated and should be calibrated by TSI once a year.

For measuring air velocity or temperature in difficult locations, the Model 8570 probe
extends to 43.25 inches and can be used either as a straight wand or with the probe tip at
90° to the main probe body. This allows for traversing large ducts as well as clean
benches and clean room ceilings (often without requiring a ladder). The Model 8571 has
a permanently straight wand for making the same measurements.

The CompuFlow kit comes in a convenient carrying case that is foam padded for
maximum protection. The carrying case holds the meter, probe, and A/C adapter, and
additional compartments are available for optional accessories such as the printer, printer
paper, and extra batteries.

SECTION 2

Theory of Operation: Thermo-anemometers

Thermo-anemometers use two sensors: an air velocity sensor and a temperature
compensation sensor. The velocity sensor is heated to an elevated temperature (relative to
the surrounding air) by means of control electronics. The temperature compensation
sensor senses the ambient air temperature and forces the velocity sensor to stay at a
constant “overheat” above ambient temperature.

When air flows past the velocity sensor, the sensor tends to cool. This causes the control
electronics to apply more power to keep the velocity sensor at a constant “overheat”. This
power is directly related to the velocity of the air flowing past the sensor. This is the
basic principle of operation for constant temperature thermo-anemometers.

2

SECTION 3

Safety

When using the CompuFlow to check air flow and/or temperature, make certain that you
can safely raise and hold the instrument while making measurements. Be especially
careful when working on a ladder.

Observe all necessary precautions so that the unit does not become caught in moving
machinery or touch any exposed electrical wiring.

DANGER:

The CompuFlow is not designed for use in gas mixtures other than air. Use with
corrosive or other dangerous or explosive gas mixtures is not recommended.

SECTION 4

About the Instrument

The CompuFlow has a digital display (shown in Figure 1). This display has two places
where numbers are displayed. There are small display digits in the upper left-hand
corner, which is primarily used to display temperature. The large display digits, on the
lower left-hand area of the display, are used to show the other measurement being taken
(i.e., velocity, volume flow, temperature, etc.).

Figure 1

3