Extech Instruments 407119-NIST User Manual
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Extech Instruments 407119-NIST User Manual

Heavy duty hot wire cfm thermo-anemometer
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User Manual
Heavy Duty Hot Wire CFM Thermo-Anemometer
Model 407119

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Summary of Contents for Extech Instruments 407119-NIST

  • Page 1 User Manual Heavy Duty Hot Wire CFM Thermo-Anemometer Model 407119...
  • Page 2 Introduction Congratulations on your purchase of the Extech 407119 Thermo-Anemometer. The 407119 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.

  • Page 3: Specifications

    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 /min) and CFM (ft /min);Temperature: °C and °F Data hold Freezes displayed reading Sampling rate Display update rate:1 second (approx.) Sensors Air velocity and temperature sensors: Thermistor type MAX/MIN Memory...

  • Page 4: Meter Description

    Meter Description Display POWER button HOLD and ESC button REC and ENTER button UNIT, ZERO, and ▲up arrow button Function and ▼down arrow button AVG. and ►right arrow button AREA SETUP button Tilt stand Battery compartment / Cover Tripod mount LCD contrast adjustment pot System reset switch RS-232 Output terminal...

  • Page 5: Operation

    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.
  • Page 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.
  • Page 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.

  • Page 8: System Reset

    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.

  • Page 9: Useful Equations And Conversions

    Useful Equations and Conversions Area equation for rectangular or square ducts Height (H) Width (W) Area (A) = Width (W) x Height (H) Area equation for circular ducts Area (A) = pi x r Radius Where pi= 3.14 and r = radius x radius Cubic equations CFM (ft...

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