Extech Instruments 451112 User manual

1 Model 451112 Version 2.4 2/04

INSTRUCTION MANUAL

Model 451112

Vane Anemometer

•Measures Air

Velocity &

Temperature

•Degrees C/F

switchable

•6 selectable units

of measure

•Data Hold function

1. INTRODUCTION

Congratulations on your purchase of Extech’s Vane Anemometer. This professional meter,

with proper care, will provide years of safe reliable service.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

2 Model 451112 Version 2.4 2/04

2. SPECIFICATIONS

2.1 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

2.2 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% + 0.2 km/hr)

ft/min 80 – 5910 ft/min * 10 ft/min ± (2% + 20 ft/min)

knots 0.8 – 58.3 knots 0.1 knots ± (2% + 0.2 knots)

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

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

3. FRONT PANEL DESCRIPTION

1. LCD Display

2. °C/ °F /Airflow selection

3. ON/OFF/Data Hold Switch

4. Airflow unit selection

5. Sensor-to-meter connection

6. Sensor head

7. Sensor handle

3 Model 451112 Version 2.4 2/04

4. OPERATION

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

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

temperature or airflow.

4.3 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.

4.4 When measuring, the air should be

striking the vane on the side of the vane

without the yellow dot (see diagram).

4.5 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.

5. 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.

airflow

Yellow

Dot

4 Model 451112 Version 2.4 2/04

ADDENDUM: 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

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

Back to the 451112 Product Info Page

Visit us at www.TestEquipmentDepot.com

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