Extech Instruments 451112 User manual

User's Guide

Vane Anemometer

Model 451112

•Measures Air Velocity & Temperature

•Degrees C/F switchable

•6 selectable units of measure

•Data Hold function

451112 V3.2 12/07

Introduction

Congratulations on your purchase of Extech’s Vane Anemometer. This meter is shipped fully

tested and calibrated and, with proper use, will provide years of reliable service.

Specifications

General Specifications

Display 0.7" (18mm) 3-1/2 digit (1999 count) LCD

Measurement m/s (meters per second), km/h (kilometers per hour), ft/min

(feet per minute), knots (nautical miles per hour), Temp. °C/°F

Data hold Freezes present value on display when selected

Sensor Structure Air velocity sensor: Conventional twisted vane arm with

balanced, low-friction ball-bearing design

Temperature sensor: Thermister

Ambient 32 °F to 122 °F (0 °C to 50 °C); <80%

Power Supply 9V battery (Heavy duty type)

Power Current Approx. 9 mA DC

Weight 12 oz. (325 g) (including battery)

Dimensions Main instrument: 6.6 x 3.2 x1.2" (180 x 72 x 32 mm)

Sensor Head: Round, 2.8" (72 mm) Dia.

Sensor Cable: 39" (1m) length

Range Specifications

Measure Range Resolution Accuracy

m/s 0.4 – 30.0 m/s 0.1 m/s ± (2% + 0.2 m/s)

km/h 1.4 – 108.0 km/ 0.1 km/h ± (2% + 0.6km/hr)

ft/min 80 – 5910 ft/min * 10 ft/min ± (2% + 40 ft/min)

knots 0.8 – 58.3 knots 0.1 knots ± (2% + 0.4 knots)

Temp. 0 to 60oC / 32 to 140oF0.1oC / 0.1oF0.8oC / 1.5oF

* Multiply displayed ft/min readings by a factor of 10

451112 V3.2 12/07

Front Panel Description

1. LCD Display

2. °C/ °F /Airflow selection

3. ON/OFF/Data Hold Switch

4. Airflow unit selection

5. Sensor head

Operation

1. Move the "OFF/ON/HOLD" switch to the ON position to apply meter power.

2. Select temperature or airflow via the "°C/°F /airflow" switch. The display will

indicate temperature or airflow.

3. Select the air velocity units using the "Airflow Units" switch, airflow will display in

"m/s", "km/h", "ft/min", or "knots" as selected. Note that displayed ft/min readings

must by multiplied by 10.

4. When measuring, the air should be striking the vane on

the side of the vane without the yellow dot (see

diagram).

5. Data Hold:During measurements, moving the

"OFF/ON/HOLD" switch to the "Hold" position will freeze

the displayed value. Move the switch back to "ON" to

cancel the HOLD function.

Battery Replacement

When the display indicates "BAT" (low battery), replace the battery. To replace the battery:

a. Remove rear screw (bottom, center), slide the Battery Cover off, and remove

battery.

b. Replace with 9V battery (heavy duty type) and reinstall the cover and rear screw.

c. Make sure the battery cover is secured after changing the battery.

451112 V3.2 12/07



Support line (781) 890-7440

Technical Support: Extension 200; E-mail: supp[email protected]

Repair & Returns: Extension 210; E-mail: repair@extech.com

Product specifications subject to change without notice

For the latest version of this User Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Extech Instruments Corporation, 285 Bear Hill Road, Waltham, MA 02451

Calibration and Repair Services

Extech offers repair and calibration services for the products we sell. Extech also

provides NIST certification for most products. Call the Customer Care Department for

information on calibration services available for this product. Extech recommends that

annual calibrations be performed to verify meter performance and accuracy.

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects

in parts and workmanship for one year from date of shipment (a six month limited warranty

applies to sensors and cables). If it should become necessary to return the instrument for

service during or beyond the warranty period, contact the Customer Service Department at

(781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact

information. A Return Authorization (RA) number must be issued before any product is

returned to Extech. The sender is responsible for shipping charges, freight, insurance and

proper packaging to prevent damage in transit. This warranty does not apply to defects

resulting from action of the user such as misuse, improper wiring, operation outside of

specification, improper maintenance or repair, or unauthorized modification. Extech

specifically disclaims any implied warranties or merchantability or fitness for a specific

purpose and will not be liable for any direct, indirect, incidental or consequential damages.

Extech's total liability is limited to repair or replacement of the product. The warranty set

forth above is inclusive and no other warranty, whether written or oral, is expressed or

implied.

451112 V3.2 12/07

Useful Equations and Conversions

Area equation for rectangular or square ducts

Area equation for circular ducts

Cubic equations

NOTE: Measurements made in inches

must be converted to feet or meters before using the above formulae.

Unit of Measure Conversion Table

m/s ft/min knots km/h MPH

1 m/s 1196.87 1.944 3.6 2.24

1 ft/min 0.00508 10.00987 0.01829 0.01138

1 knot 0.5144 101.27 11.8519 1.1523

1 km/h 0.2778 54.69 0.54 10.6222

1 MPH 0.4464 87.89 0.8679 1.6071 1

Width (W)

Height (H)

Area (A) = Width (W) x Height (H)

CFM (ft3/min) = Air Velocity (ft/min) x Area (ft2)

CMM (m3/min) = Air Velocity (m/sec) x Area (m2) x 60

Radius Area (A) = 6x r2

Where 6 = 3.14 and r2= radius x

radius

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