Agilent Technologies 490 User Manual
Agilent 490
Micro Gas
Chromatograph
User Manual
Agilent Technologies
Notices
CAUTION
WARNING
© Agilent Technologies, Inc. 2017
No part of this manual may be reproduced
in any form or by any means (including
electronic storage and retrieval or translation into a foreign language) without prior
agreement and written consent from
Agilent Technologies, Inc. as governed by
United States and international copyright
laws.
Manual Part Number
G3581-90001
Edition
Sixth edition, November 2017
Printed in China
Agilent Technologies, Inc.
412 Ying Lun Road
Waigoaqiao Freed Trade Zone
Shanghai 200131 P.R.China
Warranty
The material contained in this document is provided “as is,” and is subject to being changed, without notice,
in future editions. Further, to the maximum extent permitted by applicable
law, Agilent disclaims all warranties,
either express or implied, with regard
to this manual and any information
contained herein, including but not
limited to the implied warranties of
merchantability and fitness for a particular purpose. Agilent shall not be
liable for errors or for incidental or
consequential damages in connection
with the furnishing, use, or performance of this document or of any
information contained herein. Should
Agilent and the user have a separate
written agreement with warranty
terms covering the material in this
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terms, the warranty terms in the separate agreement shall control.
Technology Licenses
The hardware and/or software described in
this document are furnished under a
license and may be used or copied only in
accordance with the terms of such license.
Restricted Rights Legend
(June 1987) or DFAR 252.227-7015 (b)(2)
(November 1995), as applicable in any
technical data.
Safety Notices
A CAUTION notice denotes a
hazard. It calls attention to an operating procedure, practice, or the
like that, if not correctly performed
or adhered to, could result in
damage to the product or loss of
important data. Do not proceed
beyond a CAUTION notice until the
indicated conditions are fully
understood and met.
A WARNING notice denotes a
hazard. It calls attention to an
operating procedure, practice, or
the like that, if not correctly performed or adhered to, could result
in personal injury or death. Do not
proceed beyond a WARNING
notice until the indicated conditions are fully understood and met.
If software is for use in the performance of
a U.S. Government prime contract or subcontract, Software is delivered and
licensed as “Commercial computer software” as defined in DFAR 252.227-7014
(June 1995), or as a “commercial item” as
defined in FAR 2.101(a) or as “Restricted
computer software” as defined in FAR
52.227-19 (June 1987) or any equivalent
agency regulation or contract clause. Use,
duplication or disclosure of Software is
subject to Agilent Technologies’ standard
commercial license terms, and non-DOD
Departments and Agencies of the U.S.
Government will receive no greater than
Restricted Rights as defined in FAR
52.227-19(c)(1-2) (June 1987). U.S. Government users will receive no greater than
Limited Rights as defined in FAR 52.227-14
Contents
1 Introduction
Safety Information 8
Important safety warnings 8
Hydrogen safety 8
Safety symbols 9
Safety and regulatory information 10
General safety precautions 10
Shipping Instructions 13
Cleaning 13
Instrument Disposal 13
2 Instrument Overview
Principle of Operation 16
Front View 17
Back View 18
Inside View 19
Carrier Gas Connection 21
Power 23
Power source 23
Power Requirements 23
Disposal 24
Specifications 24
Ambient Pressure 25
Ambient Temperature 25
Maximum Operation Altitude 25
Micro GC Cycle with Constant Pressure 26
Micro GC Cycle with Ramped Pressure 27
3 Installation and Use
Pre-Installation Requirements 30
490 Micro GC User Manual 3
Inspect the Shipping Packages 30
Unpack the Micro GC 31
Review the Packing List 32
490 Micro GC Installation 33
Step 1: Connect carrier gas 33
Step 2: Connect to calibration gas or checkout sample 33
Step 3: Install power supply 33
Step 4: Connect to computer or local network 34
Step 5: Install Chromatography Data System 34
Step 6: Assign IP address 34
Restore the Factory Default IP Address 38
Create the Test Method 40
Perform a Series of Runs 41
Shut Down Procedure 42
Long Storage Recovery Procedure 42
4 Sample Gas Handling
5 GC Channels
Using the external filter unit 46
Heated sample lines 47
How to connect your sample to the 490 Micro GC 48
Rear inlet (heated or unheated) 48
Internal inlet 49
Internal bracket for Genie filter 51
490-Micro GC Optional Pressure Regulators 53
G3581-S0003 53
G581-S0004 56
Manual Injection 59
Manual injection guidelines 59
Injection Procedure 60
Field upgrade kits 60
Manual injection flow diagrams 61
Carrier Gas 66
Micro Electronic Gas Control (EGC) 67
Inert Sample Path 67
Injector 67
4 490 Micro GC User Manual
Column 68
Molsieve 5Å columns 69
CP-Sil 5 CB columns 70
CP-Sil CB columns 71
PoraPlot 10m column 72
Hayesep A 40 cm heated column 73
COX and AL203/KCI columns 74
MES (NGA) and CP-WAX 52 CB columns 75
Column conditioning 76
Backflush Option 77
Tuning the backflush time (except on a HayeSep A channel) 79
Tuning the backflush time on a HayeSep A channel 80
To disable backflush 81
Backflush to Detector 82
CP-Sil 5 CB Backflush to detector 82
Al2O3 Backflush to detector 82
Tuning the backflush time 83
To disable backflush 85
Set invert signal time 85
Checkout information 86
C6+ Calorific value calculation 88
TCD Detector 88
6 Channel Exchange and Installation
Tools required 90
Replacement procedure for Micro GC channel 91
Replacement procedure for Micro GC channel with RTS option 99
Replacement procedure for Molsieve filters with the RTS option 103
Carrier gas Tube Stop Modification Kit 105
7 Communications
Access the Connection Ports 108
490 Chromatography Data Systems 110
Ethernet Networks 111
IP Addresses 112
Example network configurations 112
USB VICI Valve 116
Configure Multiple VICI Valves with OpenLab EZchrom 116
USB Wi-Fi 118
490 Micro GC User Manual 5
8 Errors
Frequently Asked Questions (FAQ) 121
Glossary of network terms 121
External Digital I/O 123
External Analog I/O 124
Error Handling 126
Error List 127
6 490 Micro GC User Manual
Agilent 490 Micro Gas Chromatograph
User Manual
1
Introduction
Safety Information 8
Shipping Instructions 13
Cleaning 13
Instrument Disposal 13
This chapter provides important information about using the
Agilent 490 Micro Gas Chromatograph (Micro GC) safely. To
prevent any injury to you or any damage to the instrument it is
essential that you read the information in this chapter.
Agilent Technologies
7
1 Introduction
WARNING
WARNING
Safety Information
Important safety warnings
There are several important safety notices that you should always
keep in mind when using the Micro GC.
When handling or using chemicals for preparation or use within
the Micro GC, all applicable local and national laboratory safety
When
practices must be followed. This includes, but is not limited to,
correct use of Personal Protective Equipment, correct use of
storage vials, and correct handling of chemicals, as defined in the
laboratory’s internal safety analysis and standard operating
procedures. Failure to adhere to laboratory safety practices could
lead to injury or death.
Hydrogen safety
Hydrogen is a commonly used GC carrier gas. When mixed with air,
hydrogen can form explosive mixtures and has other dangerous
characteristics.
When using hydrogen (H2) as the carrier gas, be aware that hydrogen gas
can create a fire or explosion hazard. Be sure that the supply is turned off
until all connections are made.
Hydrogen is flammable. Leaks, when confined in an enclosed space, may
create a fire or explosion hazard. In any application using hydrogen, leak
test all connections, lines, and valves before operating the instrument.
Always turn off the hydrogen supply at its source before working on the
instrument.
• Hydrogen is combustible over a wide range of concentrations. At
atmospheric pressure, hydrogen is combustible at concentrations
from 4 % to 74.2 % by volume.
• Hydrogen has the highest burning velocity of any gas.
• Hydrogen has a very low ignition energy.
• Hydrogen that is allowed to expand rapidly from high pressure into
the atmosphere can self-ignite.
• Hydrogen burns with a nonluminous flame which can be invisible
under bright light.
8 490 Micro GC User Manual
Safety symbols
Introduction 1
Warnings in the manual or on the instrument must be observed during
all phases of operation, service, and repair of this instrument. Failure
to comply with these precautions violates safety standards of design
and the intended use of the instrument. Agilent Technologies assumes
no liability for the customer’s failure to comply with these
requirements.
See accompanying instructions for more
information.
Indicates a hot surface.
Indicates hazardous voltages.
Indicates earth (ground) terminal.
Indicates potential explosion hazard.
Indicates electrostatic discharge hazard.
Indicates a hazard. See the Agilent 490 GC user
documentation for the item labeled.
Indicates that you must not discard this
electrical/electronic product in domestic
household waste
490 Micro GC User Manual 9
1 Introduction
Safety and regulatory information
This instrument and its accompanying documentation comply
with the CE specifications and the safety requirements for
electrical equipment for measurement, control, and laboratory
use (CEI/IEC 1010-1)
This device has been tested and found to comply with the limits
for a Class A digital device, pursuant to part 15 of the FCC
rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is
operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the instruction
manual, may cause harmful interference to radio
communications.
Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will be
required to correct the interference at his own expense.
CSAUS and FCC-b.
C
NOTICE This instrument has been tested per applicable
requirements of EMC Directive as required to carry the
European Union CE Mark. As such, this equipment may be
susceptible to radiation/interference levels or frequencies,
which are not within the tested limits.
General safety precautions
Follow the following safety practices to ensure safe equipment
operation:
• Perform periodic leak checks on all supply lines and
pneumatic plumbing.
• Do not allow gas lines to become kinked or punctured. Place
lines away from foot traffic and extreme heat or cold.
• Store organic solvents in fireproof, vented and clearly
labeled cabinets so they are easily identified as either toxic,
or flammable, or both types of materials.
• Do not accumulate waste solvents. Dispose of such materials
through a regulated disposal program and not through
municipal sewage lines.
10 490 Micro GC User Manual
Introduction 1
WARNING
WARNING
This instrument is designed for chromatographic analysis of
appropriately prepared samples. It must be operated using
appropriate gases or solvents and within specified maximum
ranges for pressure, flows, and temperatures as described in this
manual. If the equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment may be
impaired.
It is the responsibility of the customer to inform Agilent customer
support representatives if the instrument has been used for the
analysis of hazardous samples, prior to any instrument service
being performed or when an instrument is being returned for
repair.
• Avoid exposure to potentially dangerous voltages.
Disconnect the instrument from all power sources before
removing protective panels.
• When it is necessary to use a non-original power cord and
plug, make sure the replacement cord adheres to the color
coding and polarity described in the manual and all local
building safety codes.
• Replace faulty or frayed power cords immediately with the
same type and rating.
• Place this instrument in a location with sufficient ventilation
to remove gases and vapors. Make sure there is enough space
around the instrument for it to cool off sufficiently.
• Before plugging the instrument in or turning the power on,
always make sure that the voltage and fuses are set
appropriately for your local power source.
• Do not turn on the instrument if there is a possibility of any
kind of electrical damage. Instead, disconnect the power cord
and contact your local Agilent sales office.
• The supplied power cord must be inserted into a power
outlet with a protective ground connection. When using an
extension cord, make sure that the cord is also properly
grounded.
• Do not change any external or internal grounding
connections, as this could endanger you or damage the
instrument.
490 Micro GC User Manual 11
1 Introduction
• The instrument is properly grounded when shipped. You do
not need to make any changes to the electrical connections or
to the instrument chassis to ensure safe operation.
• When working with this instrument, follow the regulations
for Good Laboratory Practices (GLP). Take care to wear
safety glasses and appropriate clothing.
• Do not place containers with flammable liquids on this
instrument. Spilling liquid over hot parts may cause fire.
• This instrument may use flammable or explosive gases, such
as hydrogen gas under pressure. Before operating the
instrument be sure to be familiar with and to follow
accurately the operation procedures prescribed for those
gases.
• Never try to repair or replace any component that is not
described in this manual without the assistance of an Agilent
service engineer. Unauthorized repairs or modifications will
result in rejection of warranty claims.
• Always disconnect the AC power cord before attempting any
type of maintenance.
• Use proper tools when working on the instrument to prevent
danger to you or damage to the instrument.
• Do not attempt to replace any battery or fuse in this
instrument other than as specified in the manual.
• Damage can result if the instrument is stored under
unfavorable conditions for prolonged periods. (For example,
damage will occur if stored while subject to heat, water, or
other conditions exceeding the allowable operating
conditions).
• Do not shut off column flow when the oven temperature is
high, since this may damage the column.
• This unit has been designed and tested in accordance with
recognized safety standards and designed for use indoors.
• If the instrument is used in a manner not specified by the
manufacturer, the protection provided by the instrument
may be impaired.
• Substituting parts or performing any unauthorized
modification to the instrument may result in a safety hazard.
• Changes or modifications not expressly approved by the
responsible party for compliance could void the user's
authority to operate the equipment.
12 490 Micro GC User Manual
Shipping Instructions
Cleaning
Introduction 1
If your Micro GC must be shipped for any reason, it is very
important to follow these additional shipping preparation
instructions:
• Place all the vent caps on the back of the Micro GC (see
Figure 3 on page 18).
• Always include the power supply.
• Include, if used, the inlet filter(s).
To clean the surface of the Micro GC:
1 Switch the Micro GC off.
2 Remove the power cable.
Instrument Disposal
3 Put protection plugs on the sample and carrier gas inlets.
4 Put protection plugs on the column vents.
5 Use a soft brush (not hard or abrasive) to carefully brush
away all dust and dirt.
6 Use a soft, clean cloth dampened with mild detergent to
clean the outside of the instrument.
• Never clean the inside of the instrument.
• Never use alcohol or thinners to clean the instrument;
these chemicals can damage the case.
• Be careful not to get water on the electronic components.
• Do not use compressed air to clean the instrument.
When the Micro GC or its parts have reached the end of their
useful life, dispose of them in accordance with the
environmental regulations that are applicable in your country.
490 Micro GC User Manual 13
1 Introduction
14 490 Micro GC User Manual
Agilent 490 Micro Gas Chromatograph
User Manual
2
Instrument Overview
Principle of Operation 16
Front View 17
Back View 18
Inside View 19
Carrier Gas Connection 21
Power 23
Ambient Pressure 25
Ambient Temperature 25
Maximum Operation Altitude 25
Micro GC Cycle with Constant Pressure 26
Micro GC Cycle with Ramped Pressure 27
There are several versions of the Agilent 490 Micro GC. All of
them use GC channels, each of which consists of an Electronic
Gas Control (EGC) injector, column, and detector.
The Micro GC is a self-contained package with all of the normal
GC components. It is available as a dual channel cabinet version
(one or two GC channels) or a quad channel cabinet version (up
to four GC channels). A computer with a chromatography data
system (CDS) is needed to complete the system.
This chapter provides a brief overview of the 490 Micro GC.
Agilent Technologies
15
2 Instrument Overview
Principle of Operation
The 490 Micro GC can be equipped with one to four
independent column channels. Each column channel is a
complete, miniaturized GC with electronic carrier gas control,
micro-machined injector, narrow-bore analytical column and
micro thermal conductivity detector (µ TCD), Figure 1.
Figure 1 490 Micro GC setup
The 490 Micro GC analytical channels can optionally be
equipped with a back flush option. The advantages include the
protection of the stationary column phase against moisture and
carbon dioxide. Next to that, it results in shorter analysis times
as late elution compounds, which are not of interest, do not
enter the analytical column.
16 490 Micro GC User Manual
Front View
Ready LED
LED OFF: System not ready
LED ON: System is ready
Run LED
LED OFF: No run
LED blinking: Run in progress
Error LED
LED OFF: No error
LED blinking: Error present
See “Error List” on page 127
Power LED
LED OFF: No power
LED ON: Power OK
LED blinking: Voltage < 10 Volt
Sample 1 and Sample 2
Sample gas inlet connector (for unheated front
inlets)
See “Manual Injection” on page 59
Power On/Off Switch
Switch the Micro GC ON or OFF
Instrument Overview 2
Figure 2 Front view of the 490 Micro GC
490 Micro GC User Manual 17
2 Instrument Overview
Power connector
Power connector (male)
See “Power” on page 23
Vents
It is possible to connect long vent lines to
these fittings in order to safely guide
hazardous fumes to a fume hood or other
appropriate vent.
Carrier gas input
Carrier gas input connector
See “Carrier Gas Connection” on
page 21
Back View
Figure 3 Back view of the 490 Micro GC
18 490 Micro GC User Manual
Inside View
Assign IP address switch
See “Ethernet Networks” on
page 111.
LAN indicators
Red LED: Transmit data
Green LED: Receive data
Ethernet (LAN)
connector
Ethernet RJ45
connector.
See “Ethernet
Networks” on page 111.
COM 1
RS-232 communication
interface
Digital I/O
Digital input and output
signals, such as
start_stop, ready_out,
and start_in.
See “External Digital
I/O” on page 123.
COM 3 and COM 4
RS-485 (4-wire)
communication interface.
See Table 1 on page 20.
Analog I/O
External analog I/O signals.
See “External Analog
I/O” on page 124.
COM 2
RS-232 (2-wire)
communication interface.
See “490 Chromatography
Data Systems” on
page 110.
USB
communication interface.
See “USB VICI Valve” on
page 116 and “USB
Wi-Fi” on page 118
SD Card Slot
No function supported.
Instrument Overview 2
Open the right side cover and the cable connectors will be
visible. See Figure 4.
Figure 4 Cable connectors (main board G3581-65000 shown)
490 Micro GC User Manual 19
2 Instrument Overview
The Micro GC provides communications ports as shown in
Table 1, depending on the model.
Table 1 Micro GC communication ports
Port Connection 490 Micro GC 490-Mobile Micro GC 490-PRO Micro GC
LAN Ethernet Interface with PC Interface with PC Interface with PC
COM 1 RS232 Not available Not available Valco stream selector;
Serial MODBUS
COM 2 RS232 Valco stream selector
Field case
†
LCD
COM 3 RS485
RS232
RS422
COM 4 RS485
RS232
RS422
Not available
Not available
Not available
Not available
Not available
Not available
Valco stream selector
Field case
†
LCD
Not available
Not available
Not available
Not available
Not available
Not available
Valco stream selector;
Serial MODBUS
†
LCD
Serial MODBUS
Not available
Not available
Serial MODBUS
Not available
Not available
*
*
;
*
*
Analog I/O Analog I/O Analog I/O Analog I/O
Digital I/O Digital I/O;
ready in - ready out;
start in - start out;
extension boards
‡
USB VICI Valves, WIFI interface VICI Valves, WIFI interface,
Digital I/O;
ready in - ready out;
start in - start out;
extension boards
‡
USB Storage
Digital I/O;
ready in - ready out;
start in - start out;
extension boards
‡
VICI Valves, WIFI interface,
USB Storage
* Optional PRO license required
† Optional accessory
‡ Extension boards not included
20 490 Micro GC User Manual
Carrier Gas Connection
CAUTION
Instrument Overview 2
The carrier gas line is connected to the Micro GC at the back
panel Carrier 1 or Carrier 2 port.
Do not use any kind of plastic tubing since air will diffuse through the
tubing, which may cause noisy baselines and decreased sensitivity. The
metal tubing must be clean for GC use. Buy either flamed or chromatographically clean tubing.
Specifications for the carrier gas:
Pressure: 550 kPa ± 10 kPA (80 psi ± 1.5 psi)
Purity: 99.999 % minimum
Dry and free of particles: Gas Clean filters recommended
Gas Clean filters are recommended to remove any traces of
moisture and oxygen. For low-level analysis, consider using a
better grade of carrier gas.
Gas Clean filters are filled with nitrogen. If you are not using
nitrogen as the carrier gas, flush filters and gas lines after
installation of a new filter.
The type of analysis you want to perform dictates the type of
carrier gas to use. The difference between the relative thermal
conductivity of the carrier gas and the sample components
should be as high as possible. See Table 2 for several relative
thermal conductivities.
Table 2 Relative thermal conductivities
Relative thermal
Carrier gas
Hydrogen 47.1 Ethane 5.8
Helium 37.6 Propane 4.8
Methane 8.9 Argon 4.6
Oxygen 6.8 Carbon dioxide 4.4
Nitrogen 6.6 Butane 4.3
Carbon monoxide 6.4
conductivities
Carrier gas
Relative thermal
conductivities
490 Micro GC User Manual 21
2 Instrument Overview
WARNING
WARNING
Your Micro GC is configured for a specific carrier gas, either
He and H2 or N2 and Ar. Make certain that any carrier gas
selection in your Agilent data system corresponds to the carrier
gas physically connected to your Micro GC. Use only the carrier
gas corresponding to this configuration. If you change the carrier
gas type plumbed to the Micro GC, you must change the
corresponding carrier gas type in the data system.
Hydrogen is flammable. If you are using hydrogen as a carrier gas,
pay particular attention to possible leaks at connections inside
and outside of the Micro GC (use an electronic leak tester).
22 490 Micro GC User Manual
Power
CAUTION
Instrument Overview 2
Power source
• 90 to 264 Vac, frequency between 47 to 63 Hz.
• The room power outlet circuit must be exclusively reserved
for the instrument(s).
• The network should be properly grounded.
• Installation Category (overvoltage category): II
Power Requirements
The Micro GC requires 12 V Vdc, 150 W.
The Gasifier requires 12 V Vdc, 150 W.
Only use the power supply provided with your Micro GC.
This Power Supply, see Figure 5, is tailored to meet the power
needs of your Micro GC. See Table 3 on page 24 for
specifications.
Figure 5 Model GST220A12-AG1 (P/N G3581-60080)
490 Micro GC User Manual 23
2 Instrument Overview
Disposal
Specifications
Disposal of the Power Supply must be carried out in accordance
with all environmental regulations applicable in your country.
Table 3 Power supply specifications
Feature Model: GST220A12-AG1
Input voltage 85 Vac to 264 Vac
Input frequency 47-63 Hz
Inrush current 120A/230VAC
Output voltage 12.0 Vdc
Voltage adjust ± 5 %
Output power 180 W
Over voltage protection 105 %-135 % rated output voltage
Ripple and noise 80mV Vp-p
Operating temperature -30 °C to +70 °C
Storage temperature -40 °C to +85 °C
Humidity 20 % to 90 % non condensing
Safety standard UL60950-1, TUV EN60950-1, BSMI CNS14336, CSA
C22.2, CCCGB4943, PSE J60950-1 Approved
RFI/EMC standard In compliance with CISPR22 (EN55022) Class B and
FCC Part 15/CISPR 22 class B, CNS13438 class B,
GB9254, EN61000-3-2, EN61000-3-3, EN61000-4-2,
EN61000-4-3, EN61000-4-4, EN61000-4-5,
EN61000-4-6, EN61000-4-8, EN61000-4-11 (light
industry level, criteria A)
Dimensions 210 × 85 × 46 mm (L×W×H)
Weight 1.1 kg approximately
24 490 Micro GC User Manual
Ambient Pressure
The Micro GC automatically shuts down if the ambient pressure
is greater than 120 kPa.
Ambient Temperature
The Micro GC automatically shuts down if the ambient
temperature exceeds 65 °C.
Maximum Operation Altitude
Certified up to 2000 meters above sea level.
Instrument Overview 2
490 Micro GC User Manual 25
2 Instrument Overview
Pressure
Time
Initial
pressure
Run started
Equilibration
time
Sample
time
Pressurization
time
Download
method
Inject time Run time
Inject Start data
acquuisition
Run finished
After the run sampling is
begun. This means that the
sample is (mostly) sucked
into the sample loop.
Pressurization delay
(120 mS), used to
pressurize the sample
to the same pressure
as the column head
pressure.
During injection time the
sample is transported to the
column by the carrier gas.
Before a run is
started all used
method parameters
must be downloaded
via the data system.
Fixed equilibration
delay of 40 ms.
This time allows
the sample to
settle in the
sample loop.
The run can be started
when the Micro GC is
ready (Ready LED is lit).
The data system will wait
until data is received
from the Micro GC.
The real analysis
(run) and data
acquisition starts.
After the specified run
time has elapsed, the
run is finished.
Micro GC Cycle with Constant Pressure
The timing diagram below provides an overview of the constant
pressure cycle of the Micro GC.
This description is only for one channel. In most cases a
dual-channel system is used. When a dual-channel system is
used, the sequence is the same, but the timing settings can
differ. If the sample time on channel A and channel B are
different, the longest time is used for both channels. Also the
run time can be specified per channel; the data acquisition
stops per channel as soon as the run time has elapsed. The total
analysis time depends on the longest run time.
26 490 Micro GC User Manual
Micro GC Cycle with Ramped Pressure
Pressure
Time
Initial
pressure
Run started
Equilibration
time
Sample
time
Pressurization
time
Download
method
Inject time
Run time
Inject Start data
acquuisition
Run
finished
Final
pressure
Not ready
Pressure
release
Pressure
rise
Ready
Ready
Initial
time
Rise time Final time
Relieve
time
Stabilization
time
The remaining final time depends on the total run time, the duration of
the initial time and the pressure rise. This means that it is possible that
the final time is zero. Another situation is that the final pressure is
limited because of these settings. The software will check all parameter
values and change them into realistic values.
Note: During the run time, there can be only one pressure ramp to a
higher pressure.
The pressure rise is started,
the duration is depending on
two (2) parameters:
• Pressure rise
• Final pressure
Stabilization
time for the
pressure after it
has been
returned to the
initial pressure.
Fixed at 500 mS.
Relieve time, the
time needed to
decrease the
column head
pressure from the
final pressure to
the initial
pressure.
As soon as the
final pressure is
reached, the rise
stops and the final
time begins. The
pressure remains
the same.
During initial time
the column head
pressure remains
the same.
The timing diagram below provides an overview of the ramped
(programmed) pressure cycle of the Micro GC. The timing before
the injection is identical to the constant pressure cycle.
Instrument Overview 2
490 Micro GC User Manual 27
2 Instrument Overview
28 490 Micro GC User Manual
Agilent 490 Micro Gas Chromatograph
User Manual
3
Installation and Use
Pre-Installation Requirements 30
Inspect the Shipping Packages 30
Unpack the Micro GC 31
Review the Packing List 32
490 Micro GC Installation 33
Restore the Factory Default IP Address 38
Create the Test Method 40
Perform a Series of Runs 41
Shut Down Procedure 42
Long Storage Recovery Procedure 42
This chapter describes how to install and use the instrument.
For an initial installation, an example of a typical packing list is
also included. The actual packing list and included parts
depend on the options ordered.
Agilent Technologies
29
3 Installation and Use
Pre-Installation Requirements
Prepare the installation site as described in the Site Preparation
Guide (G3581-90002), including the recommended Gas Clean
filters.
Inspect the Shipping Packages
The Micro GC will arrive in one large box and one or more
smaller cartons. Inspect the cartons carefully for damage or
signs of rough handling. Report damage to the carrier and to
your local Agilent office.
30 490 Micro GC User Manual
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