Retrotech DM-2A 用户手册

Retrotec Energy Innovations, Ltd.

DM-2A Mark II   2008-02-22

Each flow device – or fan – supports various flow restrictor range configurations which enable 

you to test enclosures with larger or smaller leakage areas. Each fan model that your gauge can 
control can use a unique set of flow ranges. Your DM-2A gauge can be configured to specific 
range configuration for your selected device. The range configuration setting you select in turn 
affects all calculated values displayed by your gauge. 

The flow ranges are achieved by enlarging or reducing the opening of the fan being used 

delivers air flow to the enclosure being tested. Using a combination of various-sized fitted rings 
and plugs the fan opening can be enlarged or reduced. 

The flow settings achieved by applying these restrictions apply a specific range configuration 

value and as the fan opening size changes, the range configuration is changed. The range 
configurations applied to the fan correspond to configurations on your gauge for the device you 
are using. For example, the Retrotec 3300 series door-fan has 7 flow ranges (Open, A, B, C8, C4, 
C2, C1) which correspond to the rings and plugs while they are installed in the fan opening.

You can change the range configuration for your gauge using the R

 keypad 

button. The current range is indicated on your gauge’s display screen adjacent to the Range 
Configuration label (as shown next). 

DM-2A Mark II Dual-Channel Pressure Gauge