6 Chapter 3
Time Constant
The time constant is an averaging period. It is used
to dampen the display. If you are experiencing
fluctuating flows, a longer time constant will slow
down those fluctuations. The display will update
every second, but the displayed reading will be the
average over the last time constant period. For
example, if the time constant is 10 seconds, the
display will update every second, but the displayed
reading will be the average from the last 10
seconds. This is also referred to as a “moving
average”.
Log Interval
The logging interval is a frequency period that the
instrument will log readings. For example, if the
logging interval is set to 30 minutes, each sample
will be the average of the last 30 minutes.
Menus
DISPLAY SETUP
Display setup menu is where you will setup the desired parameters to be
displayed on the running screen. With a parameter highlighted you can then
use the ON soft key to have it show up on the running screen or select the
OFF soft key to turn off the parameter. Use PRIMARY soft key to have a
parameter show up on the running screen in a larger display. Only one
parameter can be selected as a primary, and up to 2 secondary parameters
can be selected at one time.
PRESSURE ZERO
To zero the pressure reading, select the Pressure Zero menu. The instrument
will indicate if the pressure zero was successful.
SETTINGS
Settings menu is where you can set the general settings. These include
Language, Beeper, Select Units, Time Constant, Contrast, Set Time, Set
Date, Time Format, Date Format, Number Format, Backlight and Auto Off.
Use the g
or h soft keys to scroll through the settings for each option and
use the key to accept settings.
FLOW SET UP
In Flow Setup mode, there are four types: Round Duct, Rectangle Duct, Duct
Area, and K-Factor. Use the g
or h soft keys to scroll through the types and
then press the key to accept the desired type. To change the setting,
highlight the Enter Settings option and press the key.
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