GE
Sensing
APX
Panametrics Advanced
Paramagnetic Oxygen
Analyzer
APX is a Panametrics product.
Panametrics has joined other GE
high-technology sensing businesses
under a new name
_
GE Industrial, Sensing.
Applications
A complete oxygen analyzer typically used in
applications such as:
• Vapor recovery
• Barge loading
• Flare gas
• Refinery gas
• Olefins such as ethylene and propylene
• Pure hydrocarbons
Features
• Advanced background gas compensation for varying
gas mixtures
• Infrared (IR) through-glass keypad for easy
programming in hazardous areas
• Certified for use in hazardous areas
• Resistant to liquid upsets
• No moving parts
• Universal AC input
• Long term calibration stability
• Calibrate in N2only, but use in any background gas
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Panametrics Advanced Paramagnetic
Oxygen Analyzer
The APX advanced paramagnetic oxygen analyzer is the
newest addition to the Panametrics line of
thermoparamagnetic oxygen transmitters and analyzers.
The APX is specially designed with advanced background
gas compensation that makes it ideal for applications
with defined or undefined hydrocarbon gases, including
vapor recovery, flare gas and refinery gas.
Advanced Background
Compensation
The APX’s advanced background gas compensation not
only measures the thermal conductivity of a gas, but the
heat capacity and viscosity as well. By measuring these
additional physical properties, the APX is better equipped
to differentiate background gases that have significantly
different or varying diamagnetic effects. This gives the
APX an advantage over other, traditional dumbbell
paramagnetic oxygen analyzers, which do not
automatically compensate for the inherent diamagnetic
effects of changing background gases. The result is that
the APX reliably measures oxygen more accurately in a
broader range of applications with either known or
unknown background gases.
Top Performance and Ease of Use
An onboard microprocessor gives the APX the computing
power to provide automatic oxygen signal compensation
and integrated signal-processing algorithms. This
enhances linearity and improves accuracy for reliable,
long-term measurement.
The APX also has sophisticated error-checking software
with user-programmable defaults and error limits to
detect abnormal measurement conditions, including a
loss of flow to the analyzer or a pressure spike.
The APX is easily programmed through the multilevel,
menu-driven interface, which provides convenient
access for changing defaults, analog output scaling and
calibration.
Rugged Design and
Low Maintenance
Sensor and electronic components are housed in a
flameproof and explosion-proof enclosure with
How It Works
Oxygen’s paramagnetic property causes a gas sample
containing oxygen to move within a magnetic field.
Thermistor pairs, which are part of a wheatstone bridge
circuit, sense the “magnetic wind” created by the gas
movement. The resulting signal, along with heat capacity
and viscosity measurements, is used by the
microprocessor to calculate the oxygen percentage
accurately.
Choice of Ranges
The APX provides a 4 to 20 mA output signal that is fully
programmable for zero and span. The output is
proportional to oxygen concentration and is internally
compensated for background gas and pressure
variations. The APX is available in a wide variety of
measurement ranges.
Dual-Chamber Design
Flow schematic of the APX thermoparamagnetic oxygen measuring cell.
Oxygen's paramagnetic property causes an oxygen-containing gas
sample to move within the magnetic field. The gas movement creates a
“magnetic wind” that is sensed by the thermistor pairs. Additional sensor
elements are used to measure gas heat and viscosity. Oxygen
concentration and background gas compensation are determined by the
transmitter’s microprocessor.
Induced
gas flow
Upper
measurement
chamber
Upper
flow-through
chamber
Sample
inlet
Sample
outlet
Wind
generating
(cooled)
thermistor
Wind
receiving
(warmed)
thermistor
Magnetic
field
weatherproof protection, allowing installation right at the
measurement point to simplify wiring and provide
trouble-free operation. The unique dual-chamber,
temperature-controlled, oxygen-sensor design provides
resistance to contamination, while minimizing
temperature and flow sensitivity.
GE
Sensing
APX
Specifications
(Specifications for defined background gas variations)
Accuracy
• ±0.15% O2if calibrated in the critical gas
• ±0.25% O2in any gas mixture
Repeatability
±0.1% O
2
Measurement Resolution
0.01 mA/0.1% O
2
Stability
±0.05% O2per month
Measurement Ranges (Typical)
• 0% to 2%
• 0% to 5%
• 0% to 10%
• 0% to 21%
• 0% to 25%
Analyzer Temperature
• Standard: Controlled to 113°F (45°C)
• Optional: Controlled to 140°F (60°C)
Required Sample Pressure
Regulate inlet pressure to 5 psig (0.3 bar)
Performance
Wetted Sensor Materials
Standard: Stainless steel, glass and Viton®O-rings
Environmental
• Explosion-proof design:
CSA C US Class I, Division 1, Group B,C&D,
Type 4X (approval pending)
• Flameproof design:
II 2 GD EEx d IIC T6, IP66
ISSeP03ATEX096
European Compliance
Complies with EMC Directive 89/336/EEC, 73/23/EEC LVD
(Installation Category II, Pollution Degree 2)
Functional
Analog Output
4 to 20 mA, isolated, 800 S maximum, field
programmable
Alarms
• Four SPDT rated to 2 A at 28 VDC
• One dedicated fault alarm rated to 2 A at 28 VDC
Power
85 to 264 VAC, 47 to 63 Hz
Operating Temperature
Standard: 113°F (45°C)
Ambient Temperature Range
–4°F to 95°F (–20° to 35°C), standard cell operating
temperature of 113°F (45°C)
Pressure Range
–5 psig to 5 psig (-0.3 bar to 0.3 bar)
Physical
13 in
(330 mm)
3 in
(76 mm)
6 in
(152 mm)
8 in
(203 mm)
9 in
(232 mm)
10 in
(260 mm)
6.8 in
(713.7 mm)
12 in
(305 mm)
Depth required = 10 in (260 mm) minimum
Schematic of flameproof APX. Sensor housing and controller close
coupled via certified flexible conduit. Maximum separation = 32 in
(812.8 mm). Approved for II 2 GD EEx d T6, IP66.
GE
Sensing
APX
Specifications
©2006 GE. All rights reserved.
920-008C
All specifications are subject to change for product improvement without notice.
GE®is a registered trademark of General Electric Co. Other company or product
names mentioned in this document may be trademarks or registered trademarks
of their respective companies, which are not affiliated with GE.
www.gesensing.com
18 in
(457 mm)
3 in
(76 mm)
6 in
(152 mm)
9 in
(232 mm)
6.8 in
(713.7 mm)
Depth required = 10 in (260 mm) minimum
Schematic of explosion-proof APX. Sensor housing and controller close
coupled via rigid metal conduit. Class I, Division 1, Groups A,B,C&D.
26 in
(660 mm)
7.5 in
(190 mm)
36 in (914.4 mm)
48 in
(1219 mm)
1.25 in (32 mm)
30 in (762 mm)
Schematic of typical flameproof APX sample system
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Order Information
Record selected option in blank indicated at bottom of form.
APX Advanced Paramagnetic Oxygen Analyzer
Package
2 Explosion-proof/weatherproof enclosure
Power
1 100 VAC
2 115 VAC
3 230 VAC
4 240 VAC
Keypad
1 IR keypad
Configuration
1 Close coupled, explosion-proof design, Class I, Division 1
2 Close coupled, flameproof design, EEx d T6
APX ___ __ __ __ Use this number to order product
GE
Sensing
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