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Press the BASELINE button. The word "BASELINE" will
begin to flash in the Channel A display, indicating that the
baseline feature has been initiated. At this point, the gauge is
monitoring the real-time Channel A baseline building
pressure (i.e. the existing building pressure caused by stack
and wind effects), but is not recording the reading. The
Channel B display is not active at this time.
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Press the START button to begin the baseline measurement
procedure on Channel A. Once the START button is
pressed, the word "BASELINE" stops flashing and the
gauge begins recording a long term average baseline
building pressure reading on Channel A. During the
baseline measurement procedure, the Channel B display is
used as a timer to let the user know how long (in seconds) the baseline measurement has been active. The longer
the measurement time, generally the more stable the baseline reading typically becomes. In the screen to the
right, the measured baseline building pressure is –3.8 Pascals (measured over the past 60 seconds).
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Once you are satisfied with the baseline pressure reading,
press the ENTER key to accept and enter the baseline
pressure reading into the gauge. After pressing ENTER,
Channel A will now display the baseline adjusted building
pressure reading (i.e. the measured baseline pressure
reading will be subtracted from the current Channel A
pressure measurement). The icon "ADJ" appears in the Channel A display to indicate that the baseline adjusted
pressure reading is displayed. The time averaging period for the gauge reverts back to whatever period was
selected prior to pressing the BASELINE button. Channel B is now set up to display the air flow through the
Blower Door fan (it will read LO until the fan is turned on).
Note: With the Blower Door fan off and the No-Flow Plate installed, the baseline adjusted building pressure on
Channel A should be reading close to zero. However if it is windy, there may be fluctuations either side of 0.
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Install the appropriate flow ring and turn on the Blower
Door fan. Channel A will now display the baseline adjusted
building pressure while Channel B displays the flow
through the Blower Door fan. In the screen to the right, the
DG-700 is measuring an actual building depressurization –
48.6 Pascals caused by the 3,564 CFM of air flow through
the Blower Door fan (open fan).
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If the readings are fluctuating more than desired, change the time averaging period to 5 second average, 10
second average or long term average.
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Record the building pressure and fan flow readings at the various target building pressures used in your test
procedure.
3.7.b Entering Baseline Readings into TECTITE Software When Using the Baseline Feature:
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When using the Baseline feature, and the TECTITE program to analyze your test data, be sure to enter "0" into
the Pre and Post Test Baseline fields in the Manual Data Entry Table. This is because the Baseline feature
automatically subtracts the measured baseline pressure from the building test pressure readings.
Note: Pressing the CLEAR button clears the baseline measurement buffer and turns the baseline feature off. If the
gauge Mode is changed while the baseline measurement feature is active, the baseline measurement buffer is cleared
and the baseline feature is turned off.
Chapter 3
13
Pressure/Flow Mode
Operating Instructions
for the DG700
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