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
Page 2
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
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.
Page 3
• Flow control. Sensors are operated at a ow appropriate
for the condition under which the sensors were calibrated.
Bypass loops are used to decrease transport time from the
sample taps to the sample panel.
• Automatic calibration. For many gas analyzers, sample
systems are designed with automated valves that are
actuated by the analyzer controller at pre-set time intervals
(daily, weekly, monthly) to automatically calibrate or
verify the sensor. This provides a system that is always
in calibration without the need for instrument engineer
intervention.
• Multiple streams. A common approach to maximize
analysis for multiple sample points is to provide multiple
input streams to the analyzer panel. An automated
approach can be provided by supplying inlet streams
with solenoid valves or automated valves (electrically or
pneumatically actuated).
• Ultra high purity. For PPB purity applications, users may
consider sample systems with VCR® ttings and 316SS
electro-polished tubing. These components are commonly
used in semiconductor applications to improve leak
integrity and reduce tubing eects on moisture and oxygen
measurements.
Thermoparamagnetic process oxygen analysis of a low
pressure application with remote selection of sample,
purge, and calibration gases.
Process sample point
Calibration gas
(where applicable)
Sample system panel or
enclosure
Moisture analysis in high pressure natural gas. Dual
coalescing lters with bypass ow to remove TEG from
sample gas. (TEG is conductive alcohol found in pipeline
NG from TEG dryer carryover, which can bias Alux sensor
readings.) It can be coalesced out of sample, providing
reliable sensor performance.
Analyzer/controller, local
or remote (as applicable)
Sample vent or drain
Or
Power/signal return for
transmitter solutions
Page 4
Sample Systems Specications
DRAIN TO
TANK
9
INLET
SAMPLE
(228.6)
(MIN)
9.00
INLET
SPAN GAS
INLET
EDUCTOR
ANALYZER
OXYGEN
1
3
1
1
8
10
4
5
2
1
9
11
8
1
7
(22.2)
.875
.875
(22.2)
(990.6)
39.00
(946.1)
37.25
1/2" DIA.
HOLES (4)
27.00
25.25
(685.8)
(641.3)
DRAIN
OUTLET
0.875
(22.2)
0.875
(22.2)
21.00
(533.4)
21.00
(533.4)
1/2" DIA.
HOLES (4)
19.25
(488.9)
(488.9)
19.25
1
5
6
4
3
2
SAMPLE
1
INLET
SAMPLE
OUTLET
WATER
INLET
WATER
1
SAMPLE
CELL
All systems are designed to meet specic customer needs.
Specications indicate typical recommendations for systems
designed by GE.
Wetted Materials
Typically 304SS, 316SS, or 316LSS. Components may have
glass, viton o-rings, or other wetted materials. Systems
available in Monel and/or 316SS for NACE MR1075 EN3.1.B
compliance for natural gas streams with high H2S content.
Sample systems can also be manufactured with PFA tubing
and components for acid gas applications.
Isolation
Via needle and/or ball valves
Pressure Regulation
Via pressure regulators and/or back-pressure regulators.
Systems can be supplied with pumps or eductors to pull a gas
sample from a low pressure source.
Temperature Control
Enclosed sample panel with insulation may be heated by
enclosure heaters (typically explosion-proof) and/or cooled by
air handling systems or vortex coolers, both with thermostat
control. Systems in direct sunlight environments may use a
sunshade to avoid radiational heating.
Quality Assurance
GE sample systems are designed and manufactured in
accordance with manufacturing site quality policies (typically
ISO 9001) and using GE application engineering standard
practices. All sample systems are visually inspected for
workmanship and to conformance-to-order requirements.
Sample systems may also be inspected against standard
drawings or customer-approved drawings, where applicable.
All sample systems are pressure tested using dry compressed
air and leak detection uid.
Documentation
GE can provide sample system drawings as quoted/built. For
complicated projects, an approval cycle is recommended and
system sub-sourcing and construction is typically initiated
after receipt of approved drawings.
Typical drawing packages include one CAD 2-D outline and
dimension drawing with component layout/interconnections
plus a BOM (Bill of Material) for each unique sample system
design in a particular order.
Heat tracing of sample lines from sample tap to sample
system panel is within the customer or contractor scope.
Flow Control and Measurement
Via needle valves and/or ne metering valves. Displayed
measurement via variable area (VA) owmeters. Alarms via
integral ow switches on VA owmeters or via separate ow
switch component.
Fittings
Typically compression type ttings, 1/4 in (6 mm). Custom
systems available with VCR® installations for UHP applications
requiring metal-to-metal face sealing components.
Filtration
Particulate ltration typical to 7 micron particulate level. Liquid
knock-out via coalescing lters, membrane lters, and liquid
dumps.
New Sampling/Sensor Initiative (NeSSITM)
Systems available designed to NeSSI (ISA SP76) for certain
Standard sample system for
measurement of oxygen in low
pressure inerting (blanketing)
Standard sample system for measurement
of moisture in high temperature
hydrocarbon liquids
gas applications
Factory Acceptance Test (FAT)
GE can perform FATs at our manufacturing sites to
accommodate customer-specic inspection requirements
such as visual inspection, pressure/leak testing, operational
performance test, and documentation inspection. FAT requires
GE review and acceptance of customer requirements, which
usually is done at the inquiry and quotation stage.
www.gesensinginspection.com
BR-161A
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