Retrotec DM32 - Manual (Page 16)

Page 16 of 94
©Retrotec Inc. 2014
When the gauge is plugged into mains power on a completely depleted battery, it may take a few minutes
to gain sufficient charge to have enough power to show the splash screen. If you press the power button
and the screen flashes without showing the splash screen, this indicates the gauge is still in the process of
gaining enough charge and will start shortly. (the gauge may also repeatedly run the Re-calibrate
touchscreen procedure when battery is too low). Plugging the gauge into the computer when the battery is
depleted will not provide enough power to restore the gauge, it must be plugged into mains power.
The Lithium-Polymer rechargeable battery provided with the gauge can last up to 3 years. Once the battery
becomes unable to hold a charge, it must be changed. Changing the battery will require return to the
factory, conveniently at about the same time that the gauge will need a factory re-calibration.
2.6 Use keys on the Home screen to control gauge operation
2.6.1. [Channel A] Pressure Reading
The [Channel A] display always shows the pressure difference between the blue pressure port “input A”
and the red pressure port “ref A”. If the pressure tubes are connected as illustrated in Retrotec’s
Door Fan
Operation manual , [Channel A] shows the building pressure.
The pressure units can be displayed in units of Pa, psf or in WC. To change the units for the [Channel A]
Reading, from the Home screen, tap [Settings]  [Result to be displayed] [Pressure:] until the desired
units are displayed.

The [Channel A] Reading will be negative if there is a higher pressure on the “-“ (red) pressure port

The [Channel A] Reading will be positive if there is a higher pressure on the “+“ (blue) pressure
port
The [Channel A] Reading is also a key; when it is tapped the [Channel A] and [Channel B] displays are
frozen. This feature is convenient for jotting down test data. “HOLD!” will be displayed in the Top Bar to
indicate the readings have been frozen.
2.6.2. [Channel B] Pressure Reading or Result
The [Channel B] display can show the pressure difference between the yellow pressure port “ref B” and the
green pressure port “input B”. If the pressure tubes are connected as illustrated in Retrotec’s
Door Fan
Operation manual , [Channel B] shows the Fan Pressure.

The [Channel B] pressure will be negative if there is a higher pressure on the “-“ (yellow) pressure
port

The [Channel B] pressure will be positive if there is a higher pressure on the “+“ (green) pressure
port
The gauge can also use the pressure on Channel B to calculate and display different results for the [Channel
B] Result, such as:

Pressure: Pa, psf or in WC

Flow: CFM, L/s, cu m/s, cu m/h

Flow/Area (Permeability): CFM/sq ft, CFM/100 sq ft, CFM/1000sq ft, (cu m/h)/sq m, (L/s)/sq m

Air changes per hour: /h

Equivalent leakage area extrapolated to 10 Pa, “EqLA10”: sq ft, sq in, sq cm

Equivalent leakage area, “EqLA”: sq ft, sq in, sq cm

Effective leakage area, “EfLA”: sq ft, sq in, sq cm

Effective leakage area extrapolated to 4 Pa, “EfLA4”: sq ft, sq in, sq cm