Setting Mode to Get the Results You Want on the Gauge

DM2

Step 1: Choose the Right Device & Range

  • Press Device to select the gauge’s connected equipment (e.g., Retrotec DU200 or other DucTester).

  • Press Range Config to match the actual range ring or plate installed on the fan (e.g., Mid, Low).

    • The gauge uses this selection to compute airflow accurately.

Mismatch between physical equipment and gauge settings can lead to flow miscalculations or “TOO LOW” readings. Always double-check before starting.

Step 2: Select the Desired Result Mode

  • Press Mode to cycle through enabled result options—Flow (CFM), Flow/Area, ACH, EqLA, etc.

  • To add or remove modes, press Setup, go to Mode Setup, use arrows to enable/disable modes and select units. Exit to save.

    • This helps simplify the interface by showing only relevant options.

Step 3: Set Time Averaging & Auto-Zero

  • Press Time Avg to choose an averaging time (1s–2min).

    • Longer averaging (e.g. 10–20s) helps stabilize readings in windy conditions—wait twice the averaging time before recording.

  • Press Auto Zero to correct drift every 8 seconds. Useful in blower-door tests; be cautious if recording rapidly.

Step 4: Enable @Pressure (Optional)

If you’re using Set Speed or Set Pressure mode:

  1. Press Set Pressure and enter a target (e.g., 25 Pa) to automate fan speed.

  2. Tap @ Pressure to extrapolate results on Channel B at exactly the set pressure—useful when true pressure stabilizes slightly below target.

    • The display will change to something like “CFM @25.0 Pa”.

    • Extrapolation is most accurate within ~80% of the target.

Final Setup Checklist

Before you test, ensure:

  • Device + Range settings match your hardware

  • Desired outputs—only those needed—are enabled via Mode Setup

  • Time averaging matches field conditions

  • Auto zero is on for drift correction

  • @Pressure enabled only when using Set Speed or Set Pressure

Why Proper Setup Matters

Correct mode settings ensure:

  • Accurate data: Flow and leakage numbers are based on the right device and range

  • Consistent readings: Averaging filters out noise, Auto‑Zero maintains accuracy

  • Compliance: Results (“CFM @25 Pa”, EqLA, ACH) reflect industry standards

  • Simplified workflow: Only relevant modes are visible, avoiding confusion

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