plgc ii software

Gal-078 PLCG2Broch 4pg
PLGC II
3/26/04
4:21 PM
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天燃气气相色谱仪
PLGC II
GAS CHROMATOGRAPH
GAS COMPOSITION INCLUDING
BTU/HEATING VALUE CALCULATION
SPECIFIC GRAVITY CALCULATION
Gal-078 PLCG2Broch 4pg
3/26/04
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PLGC II GAS CHROMATOGRAPH FOR
PIPELINE AND PROCESS APPLICATIONS
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The PLGC II is a compact and low cost gas chromatograph equipped with a universal
thermal conductivity detector. The unit offers a wide range of applications where
hydrocarbon gas or fixed gas analysis is required, such as in BTU measurement for the
natural gas industry.
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The PLGC II can be used in many measurement applications where an isothermal TCD
scheme is suitable. It is a fully automated system designed to perform on-line, real time
analysis. The Windows® based configuration software allows the user to view most
recent or saved chromatograms as well as configure the analyzer.
The PLGC II calculates the following for up to 8 streams:
• Heating value
• Compressibility
• Specific gravity
• Specific heat ratios
• Wobbe index
• Component concentrations
Features:
• 24 volt DC operation
• No instrument air required
• Division II electrical classification
• Low helium consumption
standard (Div I optional)
• Thermistor TCD detector
The excitation board provides power for
the thermal conductivity detector.
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The individual components are separated in
the column by process of adsorption and
diffusion. Up to two columns are supported.
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The micro volume diaphram valve is
actuated by carrier gas to perform the
sample injection.
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Customer connections for helium carrier
gas, calibration gas and sample gas.
Solenoids electromechanically switch the
flow of gas to inject sample gas into the
system.
The computations, setup and
communications for the PLGC II are
performed by the Motherboard.
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The LCD display is capable of displaying
all information about the sample or status
of the PLGC II.
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Optional AC power adapter
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Optional extended box to allow such
options as: AC power and multiple
streams.
The detector is a temperature type TCD selected for high sensitivity at ambient
temperatures and short response time. It consists of a heated filament contained in a
stainless steel block. Gas flowing through the block loses heat to the block depending
on the concentration and the thermal conductivity of the gas.
The detector is in a temperature controlled enclosure to minimize the effect of ambient
temperature changes. To further reduce temperature and flow effects, a reference
filament is used in a wheatstone bridge configuration.
TCD Detection
8 Milliamp Constant Current
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Analyzer Detector
Filament Support 525
A-A Mount
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INTELLIGENT LCD
Displays a choice of:
• Heating valve/specific gravity
• Component values
• Chromatograms
Output to Pre-amp
500 Ohm
500 Ohm
FILAMENT SUPPORT 525
LU
B
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DETECTOR
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• Low maintenance
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The TCD measures the concentration of the
components of the sample gas based on
changes in the thermal conductivity of the
components.
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• Reliability
• Temperature control
• Output alarms
• Status
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Sample
SAMPLE INJECTION VALVE
The chromatograph is composed of
a 10-port micro volume diaphragm
valve and generally 2 columns
(some applications may only require
one). The DV22 performs the
injection and the backflush. It is
specifically designed for heavy-duty
applications and is rated at
1,000,000
injections
before
requiring service. In two column
systems, column 1 passes all
components except C6+, trapping
C6+ for a quick backflush out.
Column 2 separates the remaining
components. Total analysis time is
approximately 15 minutes and is run
iso-thermally at 40°C (optional 5
min cycle time is also available). The
temperature of the chromatography
enclosure is controlled to minimize
retention time shifts due to ambient
temperature changes.
Vent
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PLGC
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II Sample Handling Equipment
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Carrier
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col 1
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col 2
Detector
Valve On
Sample
Vent
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2
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Carrier
col 1
7
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Detector
PLGC II SOFTWARE
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col 2
Valve Off
The PLGC II software has been designed to receive, interpret, and plot data from the
PLGC II gas chromatograph. Peaks in the resulting chromatogram identify the
compounds by retention time and the concentration by the area of the peak. Various
parameters, including heating value, specific gravity, and compressibility factor, can be
displayed with the software. The Graphical User Interface (GUI) for the software is a
user friendly Windows® based system.
Computer Requirements:
Operating System:
DIMAC Gas Chromatogram
®
An IBM compatible PC with “Windows 98,
NT or ME” operating system will be required.
Memory:
The PC must have a minimum of 64 MB
of RAM.
Disk Drives:
The PLGC II configuration program is
provided on CD Rom, and requires at least
20MB on the disk drive. Extra space will be
required to save data.
Serial Port:
To run the PLGC II configuration program a
supplied serial cable is required to connect
the personal computer to the PLGC II. Most
computers will have multiple COM ports to
select from. The COM port selected cannot
be shared with any other device.
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SPECIFICATIONS
DIMENSIONS
Range:
0-1000 ppm to 100%
for individual components
PLGC II - DIVISION II
(Optional Cabinet - 28”x28”x15”)
Components:
16 maximum
Streams:
8 plus calibration
25”
Response:
15 minutes to C6+ (4 minutes optional),
2 minutes nominal for single components
depending on background composition
9”
16”
12”
25”
17”
Linearity:
1% for individual components
Repeatability:
+/- 1 BTU or 0.1%
Temperature ambient:
10 to 40° C
Humidity:
0-95% non-condensing
PLGC II - DIVISION I
(Optional Cabinet - 30”x36”x15”)
10”
27”
Electrical:
24 volts DC @ maximum 50 watts
(nominal 24 watts)
Certified Class 1 Div 2 Grp B, C, D(CUL)
Temp code T3
EEX nA II B T3 (ATEX)
Inputs:
6 dry contacts
Display:
240 x 64 backlit LCD
33”
Relays:
Four user selectable for alarm or fault
(SPDT, 5 amps, 120 VAC)
Analog:
Four isolated 4-20 mA (user selectable)
Serial:
Two RS-232,
One RS-485 modbus
Data logging:
Hourly
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Daily
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Weekly
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Monthly
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Yearly
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By Analysis 32
items
items
items
items
items
items
2 years
10 years
10 years
20 years
20 years
9400 analysis
Input A/D:
Three channels 24 bit sigma delta
Real time clock:
Time and date stamp,
1 ms resolution
Sampling rate:
60 HZ
Chromatograph valve:
Maximum eight
Columns:
One to four 1/16” stainless steel
(application dependent)
Dimensions:
17” H X 16” W X 9” D
Weight:
35 pounds
Utilities:
UHP helium @ 10 cc/min @ 60 PSI
Sample:
10 to100 PSI clean,
Dry gas @ 95 cc/min
MODIFIED SPECIFICATIONS FOR THE PLGC II EXPLOSION PROOF
Electrical:
120/240 VAC @ 50 watts
Class 1 Div 1 Grp C,D
Temp Code T3
Weight:
50 pounds
Dimensions:
29” H X 13” W X 9” D
Cabinet may vary in size according to the number of streams and valves.
ISO 9001: 2000
Registered QMS
QCB # 00-1403
www.gasanalyzer.cn