Airflow Instruments ProHood PH731 User Manual

Chapter 4: Menu Setup and Navigation 39
Log Tcheb Duct Traverse
The Log Tchebycheff duct traverse is a method of determining the average air velocity or air volume
within round or rectangular ductwork. This application will show the round or rectangular duct on the
display along with the number of sample points with insertion depth (inches or millimeters). For more
information on this application and where to take the samples, refer to Appendix B of this manual.
ROUND DUCT MEAS
Move: 0.3 in
597 ft
2
/min
0:00
SAVE?
Test 001
Sample 1
Velocity or
volume flow
based on
Primary
selection in
Display Setup
Sample
measurement
countdown
Test ID Name
and Sample
To input round or rectangular duct dimensions, refer to the Flow Setup section of this manual.
The instrument operation can be configured three different ways depending on what is selected as
the LogMode/DisplayMode selection found in the data Logging menu:
If LogMode/DisplayMode is set to Manual/Single:
 Meter will display READY
o Press READ to initiate measurement
o Sample countdown (based on the Time Constant setting) will be displayed
 When Sample countdown is complete:
o Press SAVE to store the measurement sample
o Press ESC to discard and repeat measurement
 When Sample is saved, meter will prompt user to move probe to the next sample point
If LogMode/DisplayMode is set to Manual/RunAvg:
 Meter will continuously display a reading
 User can press SAVE at any time
o Meter will store sample and prompt user to move probe to the next sample point
If LogMode/DisplayMode is set to AutoSave/RunAvg:
 Meter will continuously display a reading
 User can press SAVE at any time
o Sample countdown (based on the Sample Time) will appear
o When countdown is completed, measurement will be stored to memory and user will
be prompted to move probe to next sample point.
At anytime during the duct traverse, user can press STATS to display statistics of current traverse
(Test ID).
C A U T I O N
Do not exit the application while in the middle of the traverse. You will be unable
to return and complete the remaining test points. The traverse will need to be
repeated.

Airflow Instruments ProHood PH731 Specifications

General

Brand	Airflow Instruments
Model	ProHood PH731
Category	Measuring Instruments
Language	English