Retrotec DucTester 200 Series Residential Applications - Manual (Page 12)

Page 12 of 91
©Retrotec Inc. 2015
The exterior of the inlet has the two self-referencing pressure pickups. They are connected to the green
Input B port, and are used as the reference for the Fan Pressure Sensors. Self-referencing ensures that
the measured pressure difference is always accurate, no matter what the direction of flow is with
respect to the location of the gauge and operator.
Figure 5: Self-referencing pressure pickup.
1.2 Digital Gauge
Figure 6: DM32 or DM-2 digital gauge.
The latest Retrotec Digital Gauge is included with all Retrotec DucTester systems. The gauge can be
combined with the Model 200 fan for automatic control to Set Pressure or Set Speed. The gauge is a
dual-channel manometer, which can automatically convert the measured Fan Pressure into a range of
useful results that meet every major testing standard in the world.
The gauge is also capable of taking a Baseline pressure reading, and automatically recalculating results,
in order to reflect this bias pressure. It can auto zero itself to ensure pressure readings do not drift away
from the true pressure value during a test. It is also capable of displaying results that are extrapolated
to any pressure.
The DM32 can be controlled from a computer over a Wired or WiFi network. The DM-2 requires a USB
connection for computer control.
For more information on configuring and using the DM32, see the DM32 Operation Manual.
For more information on configuring and using the DM-2, see the DM-2 Operation Manual.
1.3 Flex Duct
Retrotec's duct testing systems (DU200, DE200, DK200) include a 10" diameter, 12' long flexible duct to
connect the fan to a register, or duct system. A durable plastic Flange on one end is taped to a register
or air handler, and connected to the Flex Duct to ensure a strong and simple seal. Velcro straps on
either end securely attach the Flex Duct to the Flange and fan inlet or outlet.