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Instruction 24-9351
PCA
4-7
4.4 Differential Pressure Measurement
The difference in pressure (∆P) between two areas can be measured by
using the PCA’s two pressure ports and DRAFT Screen. By using Pres-
sure Port 2 (–) as the reference, the pressure applied to Port 1 (+) will be
displayed on the DRAFT Screen as the differential pressure between the
two ports.
1. Turn on the analyzer by pressing the key; wait for the warmup cycle
to complete; then press the MENU key until the first DRAFT Screen is
displayed (refer to Section 4.9). If a TA-SENSOR ERROR is displayed
because the probe’s thermocouple is not plugged into the analyzer, then
press the key to acknowledge the error before pressing the MENU
key.
2. While the first DRAFT Screen is displayed, remove any hoses con-
nected to Pressure Ports 1 and 2; then press the key to zero these
ports at atmospheric pressure.
3. Connect two sampling hoses to
Pressure Ports 1 and 2
(Figure 4-3). Then place the open
end of each hose into the areas
being measured.
4. The differential pressure between the two areas is now displayed on
the third DRAFT Screen. If the pressure at Port 1 is higher than
Port 2, then the pressure difference will be positive. But if the pres-
sure at Port #1 is lower, then the pressure difference will be negative.
The reading shown in this example indicates that the pressure at
Port 1 is 2.25 mb lower than the pressure at Port 2.
Operation
Figure 4-3. Differential Pressure Hose Connections
DRAFT
DRAFT – 2.25 MB
HOT SPOT ---- °C P
«S
Pressure Port 1(+)
Pressure Port 2(–)
Reference
Sampling Hoses with quick-
connect fittings are available
as an optional accessory.
Refer to Section 8.2.