Extech Instruments 407119-NIST User Manual page 6

Heavy duty hot wire cfm thermo-anemometer
Table of Contents

Advertisement

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 the
direction of the white dot
(as shown in diagram).
6. View the air velocity and temperature readings on the LCD Display. The large main LCD display
shows the Air Velocity reading. The lower LCD sub-display shows the temperature reading (left)
and the unit of measure (right).
7. To turn the meter off, press and hold the POWER button until the meter switches off.
Air Flow (Volume) Measurements (CMM / CFM)
NOTE: Temperature is not displayed while the meter is in the Air Flow mode.
1. Follow the steps in the Initialization and Zeroing section before continuing.
2. Select the air flow mode using the Function button. The LCD will display CMM (cubic meters per
minute) or CFM (cubic feet per minute) when Air Flow is selected.
3. Press the UNIT button momentarily to select the desired air flow units: CMM or CFM. The LCD
display will reflect the selection.
4. Calculate the area of the duct or vent under test (refer to the Useful Conversions and Equations
section in the back of this manual for assistance). Be sure to compute the area of the vent or
duct in square feet or meters. If you have the area in inches, convert inches to feet before
programming the meter with the area value.
5. Press the AREA SET button to begin entering the area in m
flashing. Follow the steps below to enter the area of the duct or vent in question:
Use the ► button to select a digit to change (digit will flash)
Use the ▲ button increase the value of the flashing digit
Use the ▼ button to decrease the value of the flashing digit
6. Press the REC/Enter button and then the AREA SET button to save the new area value
7. After the area has been entered, the new area value will be shown on the lower left of the LCD
2
display in ft
or m
unit of measure is CMM, the area will be shown in meters squared.
8. Press the ESC button to abort the programming at any time.
9. Place the probe in the area under test. The main LCD digits will indicate the air flow in CFM or
CMM. If the CFM or CMM reading exceeds 99999, use the displayed X10 multiplier to calculate
the reading.
10. To turn the meter off, press and hold the POWER button until the meter switches off.
2
. If the unit of measure is CFM, the area will be shown in square feet. If the
2
or ft
6
2
. The left digit will begin
407119
-en-GB_V5.7 12/17
A

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 407119-NIST and is the answer not in the manual?

Questions and answers

This manual is also suitable for:

407119

Table of Contents