Specifications

PCA

4.7 Making a Draft / Pressure Measurement

The difference in pressure (∆P) between two areas can be measured by

using the analyzer’s two pressure ports and the PRESSURE screen. By

using the –∆P port as the reference, the pressure applied to the +∆P port

will be displayed on the PRESSURE screen as the differential pressure

between the two ports.

Perform a draft / pressure measurement as follows:

1. Turn ON the analyzer and allow it to

complete its warm-up cycle ( Section

4.2).

TIP: The pressure units of measure is

selected per Section 3.7.

2. Display the MAIN MENU by

pressing the MENU (F2) button. If

necessary, press ESC until MENU

appears above F2.

3. Use the ▲▼ buttons to highlight

PRESSURE, and then press ENT to

display the PRESSURE screen.

4. Before taking a measurement, the

pressure sensor may need to be

re-zeroed if it is not already displaying

zero with both pressure ports open to

the atmosphere. If necessary, zero the

pressure sensor as follows:

• Press the ZERO (F2) button.

• Disconnect any hoses connected

to the +∆P and –∆P ports, and

then press ENT to zero the

pressure sensor.

• Reconnect any hoses. When

measuring draft, simply leave the

–∆P port open to the atmosphere

and connect the probe’s draft

hose to the +∆P port (see Figure

4-2).

5. Do one of the following to measure draft or differential pressure: