Bacharach PCA 3 Manual De Propietario
PCA
3 Manual
0024-9472 Rev 2
47
5.8. Performing 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.
Perform a draft / pressure measurement as follows.
1. Turn ON the analyzer and allow it to complete its warm-up cycle (see
NOTE: Refer to Pressure Units Selection on page 26 for
information on selecting the pressure units of measure.
information on selecting the pressure units of measure.
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.
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 -
leave the -
∆P port open to the atmosphere and connect
the probe’s draft hose to the +
∆P port (see Figure 5-12).
Figure 5-10. Performing a Draft/Pressure Measurement
5. Do one of the following to measure draft or differential pressure:
•
To measure draft, simply insert the probe into the stack
and observe the draft reading on the PRESSURE screen.
and observe the draft reading on the PRESSURE screen.
•
To measure differential pressure, connect two sampling
hoses to the +
hoses to the +
∆P and –∆P ports, and place the open end
of each hose into the areas being measured. The