Retrotec DM-2A Manual de usuario descargar pdf (Pagina 13)

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©Retrotec Inc. 2012

2.1.5 Mode

“Mode” refers to the measurements and results the DM-2 mark II can display. Each

Mode can also display in a variety of units. The top result line labeled “Pressure”

always displays Channel A pressure in the units chosen for “Pressure”. The second

result line labeled “Mode” displays the selected result in the chosen units. For information on setting

units for each Mode, see Section 3.3 Mode Setup. Table 2 lists all the Modes, the possible units that

can be set on the DM-2, and what the results mean (note that some results and units are not available

on all gauge models).

Table 2: Possible results and selectable units for the gauge

Mode

Measures

Units

Pressure

Fan Pressure through the fan

Pa, inches WC, lb/sq ft

Flow

Air flow through the fan

CFM, l/s, m

/s, m

EfLA

Effective Leakage Area – calculated size of the total

hole in the Envelope. Usually taken at 4Pa in the US

, sq in, sq ft

EqLA

Equivalent Leakage Area – calculated size of the total

hole in the Envelope. Usually taken at 10Pa in Canada

, sq in, sq ft

Air Change

Number of air changes per hour

Flow/Area

Air flow divided by the area of the enclosure

CFM/ sq ft, L/s

, CFM/100 sq ft,

EfLA/Area

Effective Leakage Area divided by enclosure area

sq in/100 sq ft, cm

EqLA/Area

Equivalent Leakage Area divided by enclosure area

sq in/100 sq ft, cm

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

/s, m

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, m3/s, m3/h

Press [Mode] to scroll through the results that have been activated in the Setup menu. If all modes are

activated then pressing [Mode] will cycle through the results in the following order:

Pressure  Flow  EqLA  EfLA  Air Changes  Flow/Area  EqLA/Area EqLA/Area

 Hole Flow  Velocity



Velocity Flow

Older gauges have the velocity and velocity flow function.

When numerical input is required, the [Mode] key functions to input the number one, [1].

2.1.6 Range Config

Range Rings and Plates 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 Manual - Door Fan Operations). Every fan that the gauge is

compatible with has a set of associated Range Configurations. Select the Range Configuration that

matches the Range Ring or Plate installed on the fan attached to the gauge to ensure that the gauge

performs accurate calculations, and displays correct results. Press [Range Config] to cycle through the

Range Configurations that are available for the currently selected device. Available Range

Configurations that are not used can be removed from the menu. See Enable and Disable Range

Configurations in Section 3.2 for detailed instructions.

When numerical input is required, the [Range Config] key functions to input the number two, [2].

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