GE Sensing air.IQ User Manual

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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 Benets

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 specically 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

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Application Engineering is the

Dierence

Our application and service engineering teams possess the expertise to provide a comprehensive sample system designed

and built for your specic situation. We know how our

analyzers perform in various applications and how our sample

handling systems can help deliver the best measurements. We oer a cost-eective source for complete analyzer packages.

• Standard systems for common applications

• Engineered systems for customer-specic 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, benet from heat tracing of sample lines and

enclosure heaters. Constant temperatures prevent diurnal

eects 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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• 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 eects 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

Power/signal return for transmitter solutions

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Sample Systems Specications

DRAIN TO TANK

INLET

SAMPLE

(228.6) (MIN)

9.00

INLET

SPAN GAS

INLET

EDUCTOR

ANALYZER

OXYGEN

(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)

21.00

(533.4)

21.00

(533.4)

1/2" DIA. HOLES (4)

19.25

(488.9)

19.25

SAMPLE

INLET

SAMPLE

OUTLET

WATER

INLET

WATER

SAMPLE

CELL

All systems are designed to meet specic customer needs. Specications indicate typical recommendations for systems

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

products.

© 2008 General Electric Company. All Rights Reserved. Specications are subject to change without notice. GE is a registered trademark of General Electric Company. Other company or product names mentioned in this document may be trademarks or registered trademarks of their respective companies, which are not aliated with GE.

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-specic 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.

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