Retrotec DM-2A Manual de usuario descargar pdf (Pagina 24)

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©Retrotec Inc. 2012

4 Using the DM-2 Gauge for Testing

The DM-2 can be used for testing either on its own, or connected to a specialized, calibrated fan.

Before it can be used for testing, it’s important to know how to connect it properly.

4.1 Making the Connections

The DM-2 mark II can be used with a Retrotec Door Fan and other similar devices. The Retrotec

Umbilical cable includes all necessary tubes and cable connections. The pressure tubes, in the Umbilical

cable, are color-coded. The pressure and hardware connection ports are also clearly labeled on the top

of the gauge.

Pressure port connections

Retrotec has a specially designed connection port that makes a perfect seal and grips the tube well, but

releases without tearing the tubing after multiple uses. This exclusive connector was designed by

Retrotec to make contact with the both tube internally and externally with a shallow taper. The tube

ends should be clean, and not stretched in order to make a proper connection. If the pressure tube is

damaged, simply slice a short piece of tube off the end to ensure a clean fit. Tubing can crack in cold

weather, but it can be warmed in hot water before being handled. Be careful to dry all water from the

tubing prior to connecting.

 Green - Input B (+) - A higher pressure on this port and PrB reads positive.

 Yellow - Ref B (-) (fan) - A higher pressure on this port and PrB reads negative.

 Red - Ref A (-) (door) - A higher pressure on this port and PrA reads positive.

 Blue - Input A (+) - A higher pressure on this port and PrA reads positive.

Figure 7. Pressure ports of the DM-2 gauge.

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Retrotec DM-2A Manual de usuario Pagina 24