Extech Instruments 407119A Operation & User’s Manual

2 Introduction Congratulations on your purchase of the Extech 407119A Thermo-Anemometer. The 407119A measures air velocity, air volume, and air temperature. It uses a telescoping probe antenna to allow convenient access to grills and diffusers. Careful use of this meter will provide years of reliable service. The Model 407119A features ...

3 Specifications General Specifications Display Dual function 5-digit LCD Measurement units Air Velocity: m/s, km/h, ft/min, knots, mph; Air Flow: CMM (m 3/min) and CFM (ft 3/min);Temperature: °C and °F Data hold Freezes displayed reading Sampling rate Display update rate:1 second (approx.) Sensors Air velocity and temperature sensor ...

4 Meter Description 1. Display 2. POWER button 3. HOLD and ESC button 4. REC and ENTER button 5. UNIT, ZERO, and ▲up arrow button 6. Function and ▼down arrow button 7. AVG. and ►right arrow button 8. AREA SETUP button 9. Tilt stand 10. Battery compartment / Cover 11. Tripod mount 12. LCD contrast adjustment pot 13. System reset s ...

5 Operation Initialization and Zero procedures (please follow these steps before use) Important Note: The meter’s probe locking switch must be in the locked position (with the probe inserted) for the meter to turn on and operate correctly. Refer to the accompanying diagram or the diagram at the top of the meter for switch orientation ...

6 Air Velocity Measurements 1. Follow the Initialization and Zeroing procedures above before continuing. 2. Open the antenna to the desired length. 3. Slide the air velocity sensor cover down. 4. Press the POWER button to turn the meter on. 5. Place the sensor in the air current to be measured. Have the air flow meet the sensor head in ...

7 AVERAGE Feature for the Air Flow Mode In the Average mode, up to 20 readings can be stored and averaged. 1. In the Air Flow Mode (discussed earlier), press the FUNCTION button momentarily until the AVG icon and a ‘zero’ appears on the lower LCD display line. 2. Press the AVG START button to record the current reading. A ‘1’ w ...

8 Advance Programming Mode From the Air Velocity mode of operation, press and hold the SET button until the meter beeps and a ‘1’ is displayed. The advanced programming mode is now accessed. The Auto Power OFF Enable/Disable and the Temperature Units selections are available in the advanced programming mode. Use the ESC button to e ...

9 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 1 196.87 1.944 3.6 2.24 1 ft/min 0.0050 ...

10 Warranty FLIR Systems, Inc. warrants this Extech Instruments brand device 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 durin ...