PRO902C MANUAL
T
FS
Rev 6.0
August 16, 2007
4-5
4.9
Probe head flow test
The dilution probe may be supplied with various jets to accomplish different dilution ratios.
Please refer to the site-specific system flow diagram to obtain the proper flow rates.
Connect a mass flow meter in-line to the eductor exhaust (outlet) port (eductor outlet
flowmeter as shown in Figure 4.9). When 30 psi instrument air is supplied to the eductor
(dilution) air inlet port, the meter flow rate should be approximately the same value as the
value recorded on the system flow diagram.
Repeat the flow test with a flow meter connected to the eductor sample inlet port (dry sample
flowmeter in figure 4.9). When 30 psi instrument air is supplied to the eductor (dilution) air
inlet port, the meter flow rate at the sample inlet port should be approximately the same value
as the value recorded on the system flow diagram.
EDUCTOR OUTLET
FLOWMETER
FLOWMETER
DRY SAMPLE
FLOWMETER
WET SAMPLE INLET
SAMPLE OUTLET
TO HEAT EXCHANGER
DILUTION AIR IN
30 PSI
PLUG OR CAP CAL GAS/
PURGE PORT FITTING
Figure 4.9
Eductor Flow Test Configuration
4.10
Eductor vacuum test
Connect the hand held vacuum pump to the eductor inlet port as shown in Figure 4.10, below.
The hand held vacuum pump is used for its vacuum gauge only. With the instrument air
pressure of 30 PSIG (200kPa) supplied to the eductor air jet, the eductor must pull a
minimum of 17 inches Hg vacuum.
Summary of Contents for PRO902C
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