Why Correct Device and Range Matter
Your digital gauge (e.g., DM‑32 or DM‑2) must be configured to match:
The connected equipment (e.g., blower door fan or DucTester model)
The installed flow restriction (range ring or plate) on the fan
If these don’t align, the gauge won’t calculate airflow correctly. Data may be off—or unusable entirely.
How to Set Device and Range on Gauge
Step 1: Access the Menu
On the gauge’s Home screen, tap “Range/Device”
If your device isn’t listed, tap “Change Device” to select the correct one
Step 2: Select the Correct Device
Choose the exact model you’re using (e.g. “DU200 DucTester”, “Model 3350SR blower”).
This aligns the gauge’s calculations with the fan’s performance characteristics.
Step 3: Choose the Matching Range
Select the installed restriction (e.g. small/medium/open).
The gauge uses this to determine the airflow curve correctly.
Step 4: Confirm on the Home Screen
When you return to the Home screen, top-bar icons will show:
Device name
Range setting
Result mode ready (e.g., CFH@50Pa on Channel B)
Pro Tips to Stay Accurate
Always check after power-cycle: Gauges remember the last-used settings, which may not match your current test setup
Double-check before testing: A mismatch—like selecting an “open” range when a restricted ring is installed—can result in wildly incorrect readings
Correct mistakes early: If you notice odd or off-scale values, revisit the Device/Range menu before capturing data
