Retrotec Commercial 441 and 451 DucTester - Manual (Page 23)

Page 23 of 56
©Retrotec Inc. 2015
5.4 Step 4 –Tubing, control and power connections
If the rechargeable batteries in the DM32 are below one quarter power, the battery charger should be
connected to the micro-USB port on the DM32. Charge them fully overnight.
Connect yellow and green tubes between DucTester and gauge. Often, the yellow, green and blue tubes
and the Control Cable are left permanently connected to the gauge but if not, make those connections.
Figure 14: Pressure ports on the top of the gauge are color-coded to match the tubing
Connect blue tube to gauge and to ducts using static probe or
connection on flange. In duct systems that are relatively tight (200
CFM or less), the induced test pressure in the system is uniform, and
all locations will provide similar results.
Figure 13: Inserting a Flow Plug into the end plate.
Figure 15: A Static Pressure Probe attached to a
pressure tube allows the measurement of
pressure without disturbances due to turbulence.