TSI 8570 OWNER’S MANUAL

OWNER’S MANUAL

CompuFlow

Thermo-anemometer

Model 8570

COMPUFLOW® MODEL 8570 SPECIFICATIONS

Velocity

Range: 0 - 9999 ft/min (0-50 m/s) Accuracy: Resolution: 1 ft/min (0.01 m/s), 5 ft/min over 500 ft/min (0.05 m/s over 5.00 m/s)

Volumetric Flow Rate

Range: Actual range is a function of maximum velocity and duct size

Duct Dimensions

1 to 250 inches in increments of 0.1 inches (1 to 635 cm in increments of 0.1 cm)

Temperature

Range: 0 to 200°F (-17.8 to 93.3°C) Accuracy:3±0.5°F (±0.3°C) Resolutions: 0.1°F (0.1°C)

Time Constant

Intervals: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, or 30 seconds Instrument Dimensions: 3.8 x 7.5 x 2.35 inches (9.65 x 19 x 6 cm) Probe Dimensions

Length: 43.25 inches (110 cm)

Diameter (tip): 0.276 inches (7.01 mm)

Diameter (base): 0.395 inches (10.03 mm)

Diameter (knuckle): 0.372 inches (9.44 mm) Weight: 1.9 lbs. (0.86 kg) Display

Primary Display: 4-digit LCD, 0.6 in. (15 mm) digit height

Secondary Display: 3.5-digit LCD, 0.3 in. (8 mm) digit height Power Source: Four C size batteries Battery Life: 24 hours average

1&2

±3 % of reading or ±3 ft/min, whichever is greater

1 Temperature compensated over an air temperature range of 40-150°F (5 to 65°C) 2 The accuracy statement of ±3.0% of reading or ±3 ft/min (±0.015m/s), whichever is greater, begins at

30 ft/min through 9999 ft/min (0.15 m/s through 50 m/s). 3 Accuracy with instrument case at 77°F(25°C), add uncertainty of 0.05°F/°F (0.03°C/°C) for change in

instrument temperature.

TABLE OF CONTENTS

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

2. Theory of Operation ....................................................2

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

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

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

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

7. Troubleshooting...........................................................9

8. Maintenance ................................................................9

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

SECTION 1

General Description

The CompuFlow Model 8570 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 Alnor once a year.

For measuring air velocity or temperature in difficult locations the 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 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.

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 lefthand area of the display, are used to show the other measurement being taken (i.e. velocity, volume flow, temperature, etc.).

Figure 1

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