Kestrel 4200 (HVAC) - Manual (Page 5)

Kestrel ® 4200 Pocket Air Flow ® Tracker 9
SPECIAL FUNCTIONS
User Screens
The Kestrel Meter has three User Screens that can be customized to display three
current measurements simultaneously. These screens can also be turned off. (See the
Main Menu section for setup instructions.)
Max/Avg for Air Flow, Air Velocity & Wind Chill
The Max/Avg values for Air Flow, Velocity and Wind Chill are measured independently
from the stored and charted data. This allows the user to start and stop the averaging period in the most
appropriate manner for their application. Averaging on all velocity-related values (air flow, air velocity and
wind chill) will be started and stopped together.
While viewing the Min/Max/Avg screen for any of these measurements, hold the unit into the wind, and
press the button when the screen displays “--average” to begin collecting data for all measurements, and
again when the screen displays “--stop” to stop collecting data and hold the values on the display. Press
the button when the screen displays “--clear” to clear the data. This routine will work simultaneously
for all measurements, regardless of which one is displayed while the routine is run. The Max/Avg for these
velocity values will not affect any other Min/Max/Avg or stored data.
Manual Data Storage
To manually store data, press the button. One of the following will appear: Data Stored (data has been
captured and will appear on chart), Full (Overwrite is off and data log is full), or Off (Manual Store button
has been disabled). (See the Main Setup Menu section for more information on memory.)
Backlight
Press the button to activate the backlight. The light will remain activated for one minute. Press the
button within one minute to deactivate the light manually.
Airflow
The Kestrel Air Flow Tracker will display the volume airflow, based on the instantaneous air velocity
and cross-sectional area of the opening through which the air is passing. If your particular industry
uses a standard of practice for air flow measurements, be sure to adhere to those standards when using
this product.
To set the dimensions of the duct or opening, press the button while viewing the AIR FLOW screen. The
DIMENSIONAL SETTING screen will appear with the word SHAPE highlighted.
The shape of the opening can be selected by pressing the or button. The options are round or
rectangular openings. Press the v button to highlight the dimensional settings. For round openings, simply
set the correct diameter of the opening. Use the and buttons to increase and decrease the value.
Holding these buttons will increase and decrease the value quickly. For rectangular openings, set both the
length and the width of the opening.
When the dimensional settings are correct, press the button to exit the DIMENSIONAL SETTING
screen and return to AIR FLOW screen. The displayed airflow value will be the result of multiplying the
instantaneous air velocity by the area of the programmed opening.
Note that you may change the units for setting opening dimensions under the Main Setup Menu (see the
Main Menu setup section instructions). Choices are inches, feet, centimeters and meters.
The Kestrel Air Flow Tracker also features an averaging function that allows you to traverse a duct and the
unit automatically averages the CFM. This method may yield more accurate results, especially in ducts
with variable flow or with registers on them. To do so, from the current Air Flow screen, simply press the