Retrotec DM-2A Bedienungsanleitung PDF herunterladen (Seite 7)

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Positive vs. Negative Pressure

The DM-2 gauge will display pressures from -1250 Pa to + 1250 Pa.

A higher pressure on the positive (“Input”) port than on the negative (“Reference”) port displays a

positive pressure on the gauge. Alternatively, a higher pressure on the negative (“Reference”) port

than on the positive (“Input”) port displays a negative pressure.

Measure a negative pressure

1. Connect a pressure tube to the red (negative, “Reference”) port of the DM-2.

2. Place the end of the tube into a glass of water, about 1 inch below the surface.

3. The gauge will display around -1.00 in WC, or -250 Pa or -5.2 PSF. Notice the negative sign.

Figure 2. The gauge displays a negative pressure (-1 in WC, or -0.1 Pa) on the DM-2.

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Retrotec DM-2A Bedienungsanleitung Seite 7