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PRO902C MANUAL
gasket with a fresh, thin coat of silicone high vacuum grease. Do no let any grease
get in the gasket opening.
G)
Reassemble the eductor assembly in the reverse order of disassembly, being sure to
align the block passages with the gasket opening.
H)
The top plate springs measure ½ inch, uncompressed. Tighten the nuts until the
spring height is approximately 3/8 of an inch.
I)
Reinstall the Probe Head.
J)
Return the air supply to the exact previous pressure.
4.8
Probe head leak test
Cap the eductor air inlet (dilution air) and the eductor exhaust (outlet) ports, then connect a
hand held vacuum pump to the eductor sample inlet as shown in Figure 4.8. Pull a minimum
vacuum of 20 inches Hg (70kPa) with the vacuum pump as shown on the vacuum gauge and
record this value. The vacuum reading must not drop by more than 0.5 inches Hg (1.7kPa) in
1 minute.
Remove the hand held vacuum pump from the eductor sample inlet port and connect it to the
purge/calibration inlet (heated filter cap). Install a probe adapter fitting into the sample probe
barrel port as shown in Figure 4.8. Pull a minimum vacuum of 20 inches Hg (70kPa) with the
vacuum pump as shown on the vacuum gauge and record this value. The vacuum reading
must not drop by more than 0.5 inches Hg (1.7kPa) in 1 minute.
Rev 6.0
HAND VACUUM PUMP
HAND VACUUM PUMP
Figure 4.8
Probe Head Leak Test Configuration
August 16, 2007
EDUCTOR INLET AND OUTLET
CAPPED OR PLUGGED
PROBE ADAPTER
CAPPED OR PLUGGED
SAMPLE OUTLET
CAPPED OR PLUGGED
TFS
4-4
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