PRO902C MANUAL
T
FS
Rev 6.0
August 16, 2007
1-3
1.3.3 Valve manifold and dilution air regulator
The air valve manifold provides distribution of the box purge and heated filter purge air, and a
place to conveniently mount the four valves for the Probe conditioning assembly. The four
valves include: SV-1, the calibration valve used to inject calibration gas in the heated filter
chamber; SV-2, the 3-way purge valve; and SV-3 and SV-4, used to purge the heat
exchanger.
The dilution air regulator is located on the left side of the air valve manifold (please refer to
the 7000 series probe box assembly drawings). The regulator is 0-60 PSI with a 0-60 PSI
gauge. The set point is 30 PSI.
1.3.4 Heated filter, dilution eductor, and probe barrel assembly
The dilution probe assembly consists of a hastelloy probe barrel and an eductor probe head as
shown in Figure 1.3. An eductor assembly and a heated filter body make up the eductor
probe head. A heated, high capacity, sub-micron filter is housed in a Teflon
®
filter body,
located within the Probe Head, and can be easily replaced during preventive maintenance.
The sampling probe barrel is typically a section of pipe with an outer diameter of 0.67 inches
and an inner diameter of 0.50 inches. Probe barrel material is selected for compatibility with
the process stream and is supplied in hastelloy C-276. The standard four (4) foot probe barrel
has an approximate 5° bend to prevent excess water buildup within the probe barrel in
saturated processes.
EDUCTOR JET
EDUCTOR AIR DRIVE INLET
SURFACE MOUNT RTD
SAMPLE CHAMBER
ORIFICE HOLDER
FILTER ELEMENT
FILTER CAP
GAS PORT
PURGE/CAL
SAMPLE GAS
UNDILUTED
OUTLET
(DRIED SAMPLE IN)
EDUCTOR INLET
(DILUTED SAMPLE OUTLET)
EDUCTOR EXHAUST
EDUCTOR HOUSING ASSEMBLY
SAMPLE
ORIFICE
CRITICAL
DILUTION CHAMBER
BARREL
PROBE
MOUNTING FLANGE
PROBE BARREL
PROBE STOP FLANGE
Figure 1.3
Dilution Probe Assembly
Summary of Contents for PRO902C
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