Retrotec DM-2A Manual do Utilizador descarregar pdf (Página 6)

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©Retrotec Inc. 2012

1 Understanding the Pressure Gauge

A high-performance digital differential pressure gauge offers a number of advantages over analog

counterparts:

 Easy to read

 Pressure sensors with greater sensitivity

 Performs calculations that would otherwise need to be done manually

A digital gauge, therefore, can save a lot of testing time with proper use of its functions.

Note: Before beginning a test, it is absolutely critical to enable and select the proper Device and Range

in order to obtain the correct results. Refer to section 3 for instructions on how to enable, select the

proper Device, and select the proper Range.

Differential Pressure

Each gauge consists of two pressure transducers, which each measure the difference in pressure

between two Input ports. The most common units of measurement are Pascals (Pa), but inches of

water column (in WC) and pounds per square foot (PSF) are also available. Inches of water column is

the easiest to visualize because one inch water column (1 in WC) is the amount of pressure required to

suck water up a straw to a height of one inch.

One inch of water column (in WC) = 249 Pa = 5.2 PSF [pounds per square foot]

To measure a pressure

1. Connect a pressure tube to the blue port of the DM-2.

2. Press [On].

3. Place the end of the tube into a glass of water, slightly more than 1 inch below the surface.

The gauge will display around 1.00 in WC, or 250 Pa or 5.2 PSF depending on the units being

displayed. (Units can be easily changed using the Setup Menu).

Figure 1. Gauge displaying 249.5 Pa (or 1 in WC).

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Retrotec DM-2A Manual do Utilizador Página 6