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Retrotec DM-2A Manual de usuario Pagina 17

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©Retrotec Inc. 2012
Mode
The DM-2 mark II can display measurements and calculate results in a variety of units.
The top result line (“Pressure”) always displays Channel A pressure in Pascals. The
second result line(“Mode”) displays the user’s selected units. (For information on
selecting units, see “Mode Setup” in section 5.3). Table 2 lists all the Modes, its units, and the results
that are available on the DM-2 (note that some units are not available on all DM-2 models).
Table 2. Possible results and selectable units for the DM-2 gauge.
Mode
Measures
Units
Pressure
Fan Pressure through the fan
Pa, inches H
2
O, lb/ft
2
Flow
Air flow through the fan
CFM, l/s, m
3
/s, m
3
/h
EfLA
Effective Leakage Area – calculated size of the total
hole in the Envelope. Usually taken at 4Pa in the US
cm
2
, in
2
, ft
2
EqLA
Equivalent Leakage Area – calculated size of the total
hole in the Envelope. Usually taken at 10Pa in Canada
cm
2
, in
2
, ft
2
Air Change
Number of air changes per hour
/h
Flow/Area
Air flow divided by the area of the enclosure
CFM/ft
2
, l/s/m
2
, CFM/100ft
2
,
m
3
/h/m
2
EfLA/Area
Effective Leakage Area divided by enclosure area
in
2
/100ft
2
, cm
2
/m
2
EqLA/Area
Equivalent Leakage Area divided by enclosure area
in
2
/100ft
2
, cm
2
/m
2
Hole Flow
The flow across a hole – to be used to measure flow
through a known hole size (like exhaust fan or register)
CFM, l/s, m
3
/s, m
3
/h
Velocity
Air velocity (requires pitot tube)
m/s, km/h, ft/s, ft/min, mph
Velocity Flow
Flow from velocity and area of duct
CFM, l/s m
3
/s, m
3
/h
Press [Mode] to scroll through the measurements that have been activated in the Setup menu. If all
modes are activated then they will cycle through the results in the following order:
Pressure Flow EqLA EfLA Air Changes Flow/Area EqLA/Area
Hole Flow Velocity Velocity Flow
When numerical input is required, the Mode key functions to input the number one.
Range Config (fan Flow Ranges)
Flow Ranges, are used to limit the air flow through a fan, so that the fan can achieve a
measurable Fan Pressure, even when moving only a small amount of air (for more
information, see Door Fan Operations Manual). Every fan that the DM-2 is compatible
with, has a set of associated Flow Ranges. Select the correct Flow Range to ensure that the DM-2
performs accurate calculations, and displays correct results. Press [Range Config] to cycle through the
Flow Ranges that are available for the currently selected device. Available Flow Ranges that are not
used, can be removed from the menu. (See “Enable and Disable Range Configurations” in section 5.2)
When numerical input is required, the Range Config key functions to input the number two.
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