External Views and Dimensions
Model GD40 - /EJAJ1, EJAF2, EJAF3, EJAF4
THE SAMPLE SYSTEM
A well-designed gas sampling system can
eliminate unplanned measurement outages by
removing oil, dust and water before they foul the
instrument. Resident particulate and moisture
filters, pressure regulators, flow meters and
valves facilitate easy calibration, measurement
isolation, and stable, repeatable gas sample
conditions. Ask your sales representative for more
information about the sample system, core
monitor and gas dryer capability with our alliance
partner —
Prevent catastrophic failures
and lengthy downtime . . .
Hydrogen Purging Standard Ranges
Range
H2 in Air
vol%
H2 in CO2
vol%
Air in CO2
vol%
85 - 100
0 - 100
0 - 100
Minimum Range
Response Time 90%
0101010100101010010001010100101011101000001010100101010100001001001000010010101
0101001010010101010101010101010101011010100000010100100100101000100010010001010
0000010101010010100010001010010001001010000101001000100111000010010100000101001
0100101000000101000001000001000001000001000001000001000000100001000010001001001
0000101001000001000011010000100001010000001010110000000101010001000001010000010
0101000000000000100010000000100001100001111000000000101000000000011001001000100
0000010001000010010101001001010100101010101010010101010101001010010101001010101
0100101001001000100001010010101010010000101010100101001010010101010101010010100
approximately 5 seconds
Linearity
±1
±1
±1
Repeatability
±0.5
±0.5
±0.5
Long Term Stability
±0.5/month
±0.5/month
±0.5/month
Density is the basic measurement, all other representations are derived
from the basic density data.
Yokogawa Corporation of America
2 Dart Road, Newnan, GA 30265-1094, USA
Phone: 800-258-2552 Fax: 770-254-0928
www.us.yokogawa.com
Yokogawa Engineering Asia PTE. LTD
5 Bedok South Road, Singapore 469270
Singapore
Phone: 65-241-9933 Fax: 65-241-9537
Yokogawa Europe B.V.
Databankweg 20, 3821 AL Amersfoort
The Netherlands
Phone: 31-33-464-1611 Fax: 31-33-464-1610
Yokogawa América Do Sul Ltda.
Praca Acapulco, 31 Santo Amaro
04675-190 Sao Paulo SP, Brazil
Phone: 55-11-548-2666 Fax: 55-11-523-6242
monitor generator purity with the
What does vigilance™ mean to Yokogawa?
For starters, always, always making sure the
products and solutions that leave our
Yokogawa Electric Corporation
World Headquarters
9-32, Nakacho 2-chome, Musashino-shi,
Tokyo 180-8750, Japan
Phone: 81-422-52-6785 Fax: 81-422-55-1728
research and development labs are the best
Represented by:
production systems efficiently and
the world has seen - from day one
A GD402/GD40
Hydrogen Purity Monitor
throughout your business life cycle. Our
innovative technologies and committed
experts help design, install and manage your
dynamically. In an ever-changing business
environment, we help plan for the future to
ensure continuity and flexibility in your
automation strategies. Yokogawa goes the
extra mile to do things right. Let us be
vigilant about your business.
Bulletin 11T3E1-E-A
The contents of this document are subject to change without prior notice.
All rights reserved. Copyright © 2004 Yokogawa Corporation of America.
Printed in USA.
and
The Yokogawa vibrating element type Hydrogen Purity Monitor
has experienced worldwide acceptance as the new
hydrogen purity measurement for electric power generators.
insulate
power
generator
electrical
windings. Inexpensive and readily available,
hydrogen is the choice insulator because its low
density and high thermal conductivity provide
the best environment for generator operation.
Contaminated hydrogen reduces generator
The GD402/GD40 hydrogen purity monitor’s
low maintenance design, self-diagnostic
capabilities, and easy-to-use YES/NO
programming provide a broad range of control
options to meet the demanding environments
of power producers.
It’s versatility allows easy replacement
of existing “old” hydrogen measurement
installations. It consists of a gas detector
(GD40) and a signal converter (GD402) that fit
directly into most generator installations.
“
“The installations used the existing generator gas sample ports and the similarity to other
Yokogawa equipment already within the plant made the operation nearly plug and play which
greatly reduced installation and startup time.”
”
Senior Instrument Mechanical Foreman, TVA Kingston power plant USA comments on the installation of 9 GD402 systems.
WHICH MONITOR TO CHOOSE?
The Yokogawa GD402/GD40 Hydrogen Purity
Monitor (HPM) helps ensure that power
generators are running with pure hydrogen. It is
a fast, accurate and reliable process gas
measurement and control device that is
unaffected by ambient temperature or vibration
and does not require reference gases or a
controlled temperature environment.
The heart of the GD40 is a unique, vibrating
cylinder, sensor technology that measures
hydrogen purity. Multi-frequency cylinder
oscillation makes the GD40’s measurement
highly resistant to errors caused by dust, oil,
vibration, and temperature changes. The
Yokogawa HPM maintains ±1% FS accuracy
and a response time (T90) of less than 5
seconds.
Simple operation, rock-solid performance, and low maintenance
define the Yokogawa Hydrogen Purity Monitor.
efficiency. Air is the most common contaminate,
originating from leaking rotor shaft seals.
5000
1300
4000
800 mW
3000
400mW
2000
1000
0
88
90
92
94
96
98
% Volume concentration
100
Fig. 1
hydrogen
avoid
with the EXA GD402 helps improve generator
conditions that place human life and expensive
efficiency and reduce operational costs. (Fig 1)
operators
1285
20
1280
0
5
10
15
20
Density
Oven Temperature
25
30
35
Time (hours)
40
0
45
50
55
60
-20
Fig. 2
EXA GD402 vs TEMPERATURE!
machinery at risk. Monitoring hydrogen purity
plant
40
10 ∫C change
102
Knowing the purity level of the generator
helps
1290
1275
60
1g/m 3 / 10 °C or less
1296
Temperature ( °C)
Power generators use pure hydrogen to cool
Density (kg / m3)
Hydrogen Purity Monitor
Effects of Hydrogen Purity
HPM
OperatingDollars
Dollars
perper
day day
A GD402/GD40
Control Output vs.
Sudden Temperature Change
With typical hydrogen measurement technology,
sudden process temperature swings can lead to
large purity measurement errors. The EXA
GD402/GD40 gas measurement remains stable
in aggressive process conditions regardless of
sharp changes in ambient or process gas
temperature (Fig 2)
EXA GD402 AND CALIBRATION
Calibration is fast and simple. The HPM requires
only two gases and usually requires less than 10
minutes to calibrate.
It takes longer to gather tools and walk to the
“instrument
than it does to calibrate!”
Georgia Power Plant Yates, Technician
TRI GAS ANALYZER
Hydrogen must be replaced with breathable air
before generator maintenance. Since H2 and air
are a potentially explosive mixture, a third purge
gas must be used as part of the generator outage
process. CO2 is used to buffer the H2 from the air
during generator maintenance. The Yokogawa
HPM measures and outputs a separate 4-20mA
signal for all phases of the generator purge
sequence.
and
The Yokogawa vibrating element type Hydrogen Purity Monitor
has experienced worldwide acceptance as the new
hydrogen purity measurement for electric power generators.
insulate
power
generator
electrical
windings. Inexpensive and readily available,
hydrogen is the choice insulator because its low
density and high thermal conductivity provide
the best environment for generator operation.
Contaminated hydrogen reduces generator
The GD402/GD40 hydrogen purity monitor’s
low maintenance design, self-diagnostic
capabilities, and easy-to-use YES/NO
programming provide a broad range of control
options to meet the demanding environments
of power producers.
It’s versatility allows easy replacement
of existing “old” hydrogen measurement
installations. It consists of a gas detector
(GD40) and a signal converter (GD402) that fit
directly into most generator installations.
“
“The installations used the existing generator gas sample ports and the similarity to other
Yokogawa equipment already within the plant made the operation nearly plug and play which
greatly reduced installation and startup time.”
”
Senior Instrument Mechanical Foreman, TVA Kingston power plant USA comments on the installation of 9 GD402 systems.
WHICH MONITOR TO CHOOSE?
The Yokogawa GD402/GD40 Hydrogen Purity
Monitor (HPM) helps ensure that power
generators are running with pure hydrogen. It is
a fast, accurate and reliable process gas
measurement and control device that is
unaffected by ambient temperature or vibration
and does not require reference gases or a
controlled temperature environment.
The heart of the GD40 is a unique, vibrating
cylinder, sensor technology that measures
hydrogen purity. Multi-frequency cylinder
oscillation makes the GD40’s measurement
highly resistant to errors caused by dust, oil,
vibration, and temperature changes. The
Yokogawa HPM maintains ±1% FS accuracy
and a response time (T90) of less than 5
seconds.
Simple operation, rock-solid performance, and low maintenance
define the Yokogawa Hydrogen Purity Monitor.
efficiency. Air is the most common contaminate,
originating from leaking rotor shaft seals.
5000
1300
4000
800 mW
3000
400mW
2000
1000
0
88
90
92
94
96
98
% Volume concentration
100
Fig. 1
hydrogen
avoid
with the EXA GD402 helps improve generator
conditions that place human life and expensive
efficiency and reduce operational costs. (Fig 1)
operators
1285
20
1280
0
5
10
15
20
Density
Oven Temperature
25
30
35
Time (hours)
40
0
45
50
55
60
-20
Fig. 2
EXA GD402 vs TEMPERATURE!
machinery at risk. Monitoring hydrogen purity
plant
40
10 ∫C change
102
Knowing the purity level of the generator
helps
1290
1275
60
1g/m 3 / 10 °C or less
1296
Temperature ( °C)
Power generators use pure hydrogen to cool
Density (kg / m3)
Hydrogen Purity Monitor
Effects of Hydrogen Purity
HPM
OperatingDollars
Dollars
perper
day day
A GD402/GD40
Control Output vs.
Sudden Temperature Change
With typical hydrogen measurement technology,
sudden process temperature swings can lead to
large purity measurement errors. The EXA
GD402/GD40 gas measurement remains stable
in aggressive process conditions regardless of
sharp changes in ambient or process gas
temperature (Fig 2)
EXA GD402 AND CALIBRATION
Calibration is fast and simple. The HPM requires
only two gases and usually requires less than 10
minutes to calibrate.
It takes longer to gather tools and walk to the
“instrument
than it does to calibrate!”
Georgia Power Plant Yates, Technician
TRI GAS ANALYZER
Hydrogen must be replaced with breathable air
before generator maintenance. Since H2 and air
are a potentially explosive mixture, a third purge
gas must be used as part of the generator outage
process. CO2 is used to buffer the H2 from the air
during generator maintenance. The Yokogawa
HPM measures and outputs a separate 4-20mA
signal for all phases of the generator purge
sequence.
Control Output vs.
Sudden Temperature Change
1290
40
10 ∫C change
1285
20
1280
1275
60
1g/m 3 / 10 °C or less
1296
0
5
10
15
Temperature ( °C)
Density (kg / m3)
1300
THE SAMPLE SYSTEM
20
Density
Oven Temperature
25
30
35
Time (hours)
40
0
45
50
55
60
-20
Fig. 2
EXA GD402 vs TEMPERATURE!
With typical hydrogen measurement technology,
sudden process temperature swings can lead to
large purity measurement errors. The EXA
GD402/GD40 gas measurement remains stable
in aggressive process conditions regardless of
sharp changes in ambient or process gas
temperature (Fig 2)
EXA GD402 AND CALIBRATION
Calibration is fast and simple. The HPM requires
only two gases and usually requires less than 10
minutes to calibrate.
It takes longer to gather tools and walk to the
“instrument
than it does to calibrate!”
Georgia Power Plant Yates, Technician
TRI GAS ANALYZER
Hydrogen must be replaced with breathable air
before generator maintenance. Since H2 and air
are a potentially explosive mixture, a third purge
gas must be used as part of the generator outage
process. CO2 is used to buffer the H2 from the air
during generator maintenance. The Yokogawa
HPM measures and outputs a separate 4-20mA
signal for all phases of the generator purge
sequence.
A well-designed gas sampling system can
eliminate unplanned measurement outages by
removing oil, dust and water before they foul the
instrument. Resident particulate and moisture
filters, pressure regulators, flow meters and
valves facilitate easy calibration, measurement
isolation, and stable, repeatable gas sample
conditions. Ask your sales representative for more
information about the sample system, core
monitor and gas dryer capability with our alliance
partner —
External Views and Dimensions
Model GD40 - /EJAJ1, EJAF2, EJAF3, EJAF4
THE SAMPLE SYSTEM
A well-designed gas sampling system can
eliminate unplanned measurement outages by
removing oil, dust and water before they foul the
instrument. Resident particulate and moisture
filters, pressure regulators, flow meters and
valves facilitate easy calibration, measurement
isolation, and stable, repeatable gas sample
conditions. Ask your sales representative for more
information about the sample system, core
monitor and gas dryer capability with our alliance
partner —
Prevent catastrophic failures
and lengthy downtime . . .
Hydrogen Purging Standard Ranges
Range
H2 in Air
vol%
H2 in CO2
vol%
Air in CO2
vol%
85 - 100
0 - 100
0 - 100
Minimum Range
Response Time 90%
0101010100101010010001010100101011101000001010100101010100001001001000010010101
0101001010010101010101010101010101011010100000010100100100101000100010010001010
0000010101010010100010001010010001001010000101001000100111000010010100000101001
0100101000000101000001000001000001000001000001000001000000100001000010001001001
0000101001000001000011010000100001010000001010110000000101010001000001010000010
0101000000000000100010000000100001100001111000000000101000000000011001001000100
0000010001000010010101001001010100101010101010010101010101001010010101001010101
0100101001001000100001010010101010010000101010100101001010010101010101010010100
approximately 5 seconds
Linearity
±1
±1
±1
Repeatability
±0.5
±0.5
±0.5
Long Term Stability
±0.5/month
±0.5/month
±0.5/month
Density is the basic measurement, all other representations are derived
from the basic density data.
Yokogawa Corporation of America
2 Dart Road, Newnan, GA 30265-1094, USA
Phone: 800-258-2552 Fax: 770-254-0928
www.us.yokogawa.com
Yokogawa Engineering Asia PTE. LTD
5 Bedok South Road, Singapore 469270
Singapore
Phone: 65-241-9933 Fax: 65-241-9537
Yokogawa Europe B.V.
Databankweg 20, 3821 AL Amersfoort
The Netherlands
Phone: 31-33-464-1611 Fax: 31-33-464-1610
Yokogawa América Do Sul Ltda.
Praca Acapulco, 31 Santo Amaro
04675-190 Sao Paulo SP, Brazil
Phone: 55-11-548-2666 Fax: 55-11-523-6242
monitor generator purity with the
What does vigilance™ mean to Yokogawa?
For starters, always, always making sure the
products and solutions that leave our
Yokogawa Electric Corporation
World Headquarters
9-32, Nakacho 2-chome, Musashino-shi,
Tokyo 180-8750, Japan
Phone: 81-422-52-6785 Fax: 81-422-55-1728
research and development labs are the best
Represented by:
production systems efficiently and
the world has seen - from day one
A GD402/GD40
Hydrogen Purity Monitor
throughout your business life cycle. Our
innovative technologies and committed
experts help design, install and manage your
dynamically. In an ever-changing business
environment, we help plan for the future to
ensure continuity and flexibility in your
automation strategies. Yokogawa goes the
extra mile to do things right. Let us be
vigilant about your business.
Bulletin 11T3E1-E-A
The contents of this document are subject to change without prior notice.
All rights reserved. Copyright © 2004 Yokogawa Corporation of America.
Printed in USA.