GE Sensing air.IQ User Manual
GE
Sensing & Inspection Technologies
Sample Systems
For Gas and Moisture Analyzers
Save Money and Time with the Right
Sample System from the Application
Experts
Sample handling systems are essential for getting top
performance from your gas and moisture analyzer
systems. To get the right sample system for your unique
application, turn to GE, the analyzer application expert
with more than 40 years of design and construction
experience. Couple GE moisture and gas analyzers with
o-the-shelf or custom-designed GE sample handling
and you’ve got a reliable, accurate, and low-
maintenance measurement system.
Features and Benets
GE sample systems enhance the performance of an
analyzer by providing sample gas to the analyzer
at optimal pressure, temperature, ow rate, and
cleanliness. Designed specically for hazardous
environments and for use with GE analyzers, GE sample
handling systems reduce your cost and downtime by:
• Providing better accuracy and reliability of
measurement
• Extending analyzer life
• Limiting analyzer maintenance and associated parts
and labor
• Facilitating eld calibration
Application Engineering is the
Dierence
Our application and service engineering teams possess the
expertise to provide a comprehensive sample system designed
and built for your specic situation. We know how our
analyzers perform in various applications and how our sample
handling systems can help deliver the best measurements. We
oer a cost-eective source for complete analyzer packages.
• Standard systems for common applications
• Engineered systems for customer-specic requirements
• Design, construction, and inspection of all systems
• Installation guidance
• Start-up and commissioning
• Calibration
• Extended warranties and service plans for analyzer systems
Sample Handling Systems
•
Isolation of the sensors for calibration and service.
Sample panels are typically located at grade as close to
the sample take-o point as possible while still allowing
easy access. Sample take-o probes to pull a sample from
the middle one-third of the pipe are used to obtain the
best representative uid. Needle or ball valves are used
for isolation, and check valves are used on sample system
outlets to prevent back-ow when tied to are or vent lines.
• Pressure regulation and pressure control to operate the
sensors at the best pressure for their capability. Moisture
measurement is best done at the highest possible pressure
for aluminum oxide sensor technology. An active pressure
sensor on the multi-function moisture probes feeds data to
the analyzer to calculate moisture content in PPMv or
lbs/MMSCF based on the sample pressure. Some sensors
have a maximum pressure based on their design and must
be operated at or near atmospheric pressure.
•
Temperature control. Sample systems may be exposed to
outdoor ambient conditions. Some sensors, especially in low
PPM ranges, benet from heat tracing of sample lines and
enclosure heaters. Constant temperatures prevent diurnal
eects of water molecules adsorbing/desorbing to wetted
sample system components, which may lead to reading
swings day to night.
Sample systems are used for isolation, ltration, and
pressure/temperature/ow control of analyzer systems in
petrochemical, natural gas, industrial gas, semiconductor,
furnace gas and heat treating, power generation, air dryer,
and pharmaceutical applications.
• Instrument, plant, utility or clean dry air
• Injection molding and extrusion
• High purity gas analysis
• Furnace or heat treating
• Natural gas—permanent and portable
• Hydrocarbon gases or liquids
• Hydrogen-cooled electric generators
• Inerting/blanketing gases
• Ambient air supply
A sample system typically consists of valves, lters, ow
meters, and pressure gauges designed to enable proper
long-term performance of an analyzer system.
In addition, oxygen sensor chemistry may be impacted with
wide temperature swings to a minor degree, so a sample
system enclosure heater prevents any sensor temperature
dependency. In high moisture and condensable applications,
a heater prevents condensation. In some applications, the
sample system location may be too hot for the sensor(s).
In this case, sample systems can be cooled by air handling
systems or vortex coolers using compressed air as a
resource.
In areas with bright sunlight, sunshades are used to shelter
the sample system from radiational heating.
•
Particulate ltration and/or liquid knock-out. Some gas
streams may contain particulates such as molecular sieve,
catalyst nes, or even pipe scale. Stainless steel particulate
lters in the 7 micron range provide a clean gas sample to
all sensors. In some cases, coalescer lters with a bypass
ow knock out any liquid condensates from the sample
stream. These lters enable a proper bypass of collected
condensate to ensure low maintenance.
In cases with heavy condensate potential, sample taps o
the process line are used with cooling coils to allow most of
the condensate to drain back to the process. Liquid
knock-out components are used to provide an additional
level of safety.
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