Retrotec DucTester 351 - Manual (Page 4)

Flow at the induced
pressure is the simplest
result.
Flow in cubic meters
per hour per square
meter (m
3 /(h·m 2 ) may
be required.
(Enter an area)
Flow in cubic meters
per second per square
meter (m
3 /(s·m 2 ) may
also be required.
(Enter an area)
Flow reads “--” at test pressure?
If the test pressure has been reached, but “--” appears,
the fan is running too slowly to accurately measure flow.
□
Switch to a lower Range Plug
□
Change [Range] to match
□
Re-adjust fan speed.
Cannot achieve test pressure at full speed?
If fan reaches 100% speed before reaching 80 Pa:
□
Change to a higher Range Plug and try again.
□
Change [Range] on the gauge to match.
□
Check seals on all registers. Look for disconnected
ducts or ducts open to outdoors.
□
Tap [@ Pressure] to get the gauge to calculate
what the flow would be at exactly 80 Pa.
Page 4 of 4
Get the results you need
□
Tap the [Channel B] key to select a different
Result, or tap the [Result to be displayed] key
on the [Settings] menu.
Show leakage area Result
Step 5: Desired results not achieved?
Equivalent Leakage Area (EqLA) describes the leakage
area in terms of one large hole in a flat surface.
Tap the [Channel B] key, then
, and select
“EqLA: cm”
[Channel A] shows the duct pressure and
[Channel B] “EqLA” shows the combined size of all
the holes in the ducts.
Leakage area is not a required result, but is a nice way to
visualize the size of the hole in the ducts.
When a Result is chosen that requires an area or volume,
or
will be shown on the Home screen. Tap to change.
The area and volume can also be changed from the
menu.
Check gauge operation and check for blocked, leaking or
pinched tubes weekly, and anytime results are in question.
To perform the gauge check, you will need the gauge
and Umbilical.
□
Set [Time Average] to 5 seconds in [Settings].
□
Tap [Channel B] and select“Pressure: Pa”.
□
Connect the yellow tube between the red and
yellow ports.
□
Repeat between different ports with each of the
tubes you use for testing.
Field check gauge weekly
If readings on Channel A and Channel B are within
2% and don’t drop rapidly, the tube is not blocked
or leaking and the gauge is correct.
Checking your gauge
and tubes regularly will
eliminate a common
source of error in
readings.