Bacharach 24-9351 manual Differential Pressure Measurement, Draft, 25 MB, HOT Spot

PCA Operation

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.

	DRAFT
DRAFT	– 2.25 MB
HOT SPOT	---- °C P
	«S

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.

Sampling Hoses with quick- connect fittings are available as an optional accessory.

Refer to Section 8.2.

	Pressure Port 2(–)
Pressure Port 1(+)	Reference

Figure 4-3. Differential Pressure Hose Connections

Instruction 24-9351 4-7