Markes International Unity 2 User manual

QUI-1056
Version 2.0 – February 2014
Markes International Ltd
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Installation manual
UNITY 2™

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Contents
1. Preface ................................................................................................. 4
1.1 Notices ............................................................................................ 4
1.2 Warranty .......................................................................................... 4
1.3 Regulatory compliance .................................................................. 4
1.4 Important safety warnings ............................................................. 4
1.4.1 Labels/symbols ................................................................. 5
1.4.2 Mains voltages .................................................................. 5
1.4.3 High temperatures ............................................................ 5
1.4.4 Hydrogen gas safety ......................................................... 6
1.4.5 Cleaning and decontamination ........................................ 6
1.5 Environment operating conditions ................................................ 6
1.5.1 Temperature ...................................................................... 6
1.5.2 Humidity ............................................................................ 6
1.5.3 Altitude .............................................................................. 7
1.6 Technical Specifications ................................................................ 7
1.6.1 Physical properties ........................................................... 7
1.6.2 Electrical properties .......................................................... 7
1.7 Technical support contact details ................................................. 7
2. UNITY 2 Pre-installation Check List .................................................... 8
2.1 Minimum computer specification for UNITY 2 control ................. 8
2.2 GC equipment requirements ......................................................... 8
2.2.1 Access into the GC oven ................................................... 8
2.2.2 GC configuration/parameter selection ........................... 8
2.3 Laboratory location ........................................................................ 8
2.3.1 Space requirements ......................................................... 8
2.3.2 Quality of the laboratory air .............................................. 9
2.3.3 Quality of the laboratory gas lines ................................... 9
2.4 Services ........................................................................................... 9
2.4.1 Power ................................................................................. 9
2.4.2 Pressure controlled supply of dry air or nitrogen
(purge gas) ........................................................................ 9
2.4.3 Pressure controlled carrier gas supply ............................ 9
2.4.4 Filters ................................................................................. 10
2.4.5 UNITY 2 and Electronic Carrier Control (ECC) ................. 10
2.5 Unpacking UNITY 2 ......................................................................... 10
3. Installing UNITY 2 ................................................................................ 11
3.1 Installing the Transfer Line ............................................................ 11
3.1.1 Installing the Transfer Line onto the GC ......................... 11
3.1.2 Installing the fused silica transfer line insert .................. 13

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3.1.3 Connecting the Transfer Line to UNITY 2 ........................ 13
3.2 Inserting Split Filter Tube ............................................................... 16
3.3 Installing the cold trap ................................................................... 18
3.4 Connections to UNITY 2 ................................................................. 23
3.4.1 Gas connections ............................................................... 23
3.4.2 Electrical connections ...................................................... 23
4. Software ............................................................................................... 25
4.1 Installing the software .................................................................... 25
4.2 Running the software ..................................................................... 25
4.3 Mass Flow Controllers .................................................................... 26
4.4 GC Interface Logic .......................................................................... 26
5. Installation Checkout .......................................................................... 28
5.1 Conditioning the Cold Trap ............................................................ 28
5.2 System checkout ............................................................................ 28

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1. Preface
This manual provides detailed instructions on the use of the UNITY 2. It is suitable for users with little or
no prior experience of the system and details the software/hardware interface and procedure for first
sample runs.
1.1 Notices
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 Markes
International.
Please note that the material contained in this document is subject to being changed, without notice, in
future editions. Markes International shall not be liable for errors or for incidental or consequential
damages in connection with the supply, use or performance of this document or of any information
contained herein, unless a separate agreement between Markes International and the user should take
precedence.
1.2 Warranty
UNITY 2 is designed for laboratory use only. It is not intended for use in domestic establishments or
establishments directly connected to a low-voltage power supply network that supplies buildings used for
domestic purposes. Where equipment is used in a field placement environment, care must be taken to
ensure that the instrument is not exposed to detrimental conditions, i.e. rain, wind, or sun. Exposure may
diminish the performance, cause damage to the instrument and/or cause the equipment to become
unsafe to the user.
If the equipment is not used in a way specified by Markes International, the safety protection provided by
the equipment may be reduced. Furthermore, system failures arising from such use may not be covered in
standard warranty and/or service contract agreements.
1.3 Regulatory compliance
The instrument is designed and manufactured under a quality system registered to ISO 9001.
The instrument conforms to the following standards:
 International Electrochemical Commision (IEC):
o 61010-1:2001.
o 61010-2-010:2003.
o 61010-2-081:2001.
 CAN/CSA C22.2 No. 61010-1 and UL 61010-1.
 The instrument conforms to the following regulation on electromagnetic compatibility (EMC):
o IEC/EN 61326-1:2006.
1.4 Important safety warnings
There are several important safety notices to keep in mind when installing and using this instrument.

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1.4.1 Labels/symbols
Throughout this manual symbols will appear where carrying out an operation may involve hazards.
Symbols and warnings also appear on the instrument, and these should be adhered to
Markes International can accept no liability for failure to do so.
BURN HAZARD
A hot surface may result in a burn injury.
INSTRUMENT/PART DAMAGE
Damage to the instrument or module may occur. This damage may not be covered under
the
standard warranties.
LIFTING HAZARD
Injury may occur if proper lifting procedures are not followed.
WARNING
General warning
symbol to alert the user that personal injury or instrument damage may
occur if the instrument is improperly used or if instructions are not followed correctly.
DISPOSAL
This label indicates the instrument must not be disposed in regular waste but in
accordance with the
WEEE scheme
1.4.2 Mains voltages

Ensure at all times that the plug (electrical isolator) can be easily and quickly
accessed during equipment use.

The instrument must be suitably earthed via the power cord.
NOTE
: Voltages within the
decreased risk of serious injury, these internal voltages should still be treated
as dangerous. Contact with any live parts may cause personal injury and/or
instrument damage.
1.4.3 High temperatures

Several parts of the UNITY 2 can be operated at high temperatures. Contact with
these zones whilst the system is in operation can cause serious burn injury. These
zones are:
o Heated valve.
o Tube oven.
See Section 2 for the location of these zones. Both
‘Burn hazard’ labels similar to that shown above.

ALWAYS operate the instrument with the covers in place to avoid accidental contact
with these zones.
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Throughout this manual symbols will appear where carrying out an operation may involve hazards.
Symbols and warnings also appear on the instrument, and these should be adhered to
Markes International can accept no liability for failure to do so.
A hot surface may result in a burn injury.
INSTRUMENT/PART DAMAGE
Damage to the instrument or module may occur. This damage may not be covered under
standard warranties.
Injury may occur if proper lifting procedures are not followed.
symbol to alert the user that personal injury or instrument damage may
occur if the instrument is improperly used or if instructions are not followed correctly.
This label indicates the instrument must not be disposed in regular waste but in
WEEE scheme
.
Ensure at all times that the plug (electrical isolator) can be easily and quickly
accessed during equipment use.
The instrument must be suitably earthed via the power cord.
: Voltages within the instrument will be a maximum of 24 V. Although there is
decreased risk of serious injury, these internal voltages should still be treated
as dangerous. Contact with any live parts may cause personal injury and/or
instrument damage.
Several parts of the UNITY 2 can be operated at high temperatures. Contact with
these zones whilst the system is in operation can cause serious burn injury. These
See Section 2 for the location of these zones. Both these zones are labelled with
‘Burn hazard’ labels similar to that shown above.
ALWAYS operate the instrument with the covers in place to avoid accidental contact
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Throughout this manual symbols will appear where carrying out an operation may involve hazards.
Symbols and warnings also appear on the instrument, and these should be adhered to
at all times.
Damage to the instrument or module may occur. This damage may not be covered under
symbol to alert the user that personal injury or instrument damage may
occur if the instrument is improperly used or if instructions are not followed correctly.
This label indicates the instrument must not be disposed in regular waste but in
Ensure at all times that the plug (electrical isolator) can be easily and quickly
instrument will be a maximum of 24 V. Although there is
decreased risk of serious injury, these internal voltages should still be treated
as dangerous. Contact with any live parts may cause personal injury and/or
Several parts of the UNITY 2 can be operated at high temperatures. Contact with
these zones whilst the system is in operation can cause serious burn injury. These
these zones are labelled with
ALWAYS operate the instrument with the covers in place to avoid accidental contact

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 Due to the high temperatures involved in the flow path, other zones of the instrument
will be at higher temperatures during operation. These may not on visual inspection
be obvious to the user. These zones are:
o The insulation of the GC transfer line.
o Top and side covers (especially directly above the heated valve).
See Section 2 for the location of these zones.
1.4.4 Hydrogen gas safety
 Hydrogen is a colourless, odourless, highly flammable gas. Hydrogen presents a
hazard as it is combustible over a variety of concentrations at ambient temperature
and pressure. It has a low ignition temperature and is very fast-burning.
 If the user does use hydrogen as their carrier gas, then they do so at their own risk.
The user must ensure that all adequate safety precautions are taken and that the
installation of the hydrogen system is carried out in accordance with all applicable
codes and standards.
 Markes International will assume no liability for any damage or injury caused by the
use of hydrogen.
 For further advice on the use of hydrogen as a carrier gas, please contact Markes
International Technical Support.
1.4.5 Cleaning and decontamination
Please consult Markes International or your local agent for information on decontamination or the use of
cleaning agents
NOTE: Incorrect cleaning/decontamination could result in damage to the instrument.
1.5 Environment operating conditions
The instrument should be protected from conditions that could cause exposure to frost, dew, percolating
water, rain, excessive direct sunlight, etc.
Performance can be affected by sources of heat and cold from heating, air conditioning systems, or drafts.
It is advisable to operate the system in a clean laboratory environment, with minimal atmospheric
concentrations of organic vapours.
1.5.1 Temperature
Recommended operating ambient temperature range is 15 to 30°C.
1.5.2 Humidity
Recommended operating humidity range is 5 to 95% non-condensing.

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1.5.3 Altitude
The product has been evaluated for operation up to a maximum of 6500 ft (2000 m), in accordance with
safety standards. Higher altitudes pose no safety risk, but instrument performance may be reduced.
NOTE: For storage or shipping the allowable temperature range is -40 to 70°C and the allowable humidity
range is 5-95% non-condensing. After instrument exposure to extremes of temperature or
humidity, allow 2 hours for return to the recommended ranges before switching on.
1.6 Technical Specifications
1.6.1 Physical properties
Height: 40 cm (15.75”)
Width: 16 cm (6.3”)
Length: 51 cm (20”)
Mass: 16 kg (35.2 lbs)
1.6.2 Electrical properties
Maximum Power: 650 W
Line voltage: 100-240 V (automatically selected)
Frequency: 50/60 Hz
Input inrush current (A): <40 A (cold start)
1.7 Technical support contact details
In the first instance please contact your distributor. If they are unable to resolve your query, please contact
Markes International (details below).
Address: Gwaun Elai Medi-Science Campus, Llantrisant, RCT, UK, CF72 8XL
Website: www.markes.com
E-Mail: [email protected]
Telephone: [phone]
Fax: [phone]

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2. UNITY 2 Pre-installation Check List
2.1 Minimum computer specification for UNITY 2 control
UNITY 2 software will run on most 32 and 64-bit versions of Windows®. However, use of currently
supported versions of Windows is strongly recommended.
The minimum PC specifications are:
CPU 400 MHz Pentium (or equivalent)
RAM 64 MB
Free Disk Space 20 MB (for installation)
Minimum resolution XGA (1024 x 768 pixel)
Other requirements Windows compatible mouse, and one free serial or USB port*
2.2 GC equipment requirements
UNITY 2 is usually connected to a gas chromatograph configured with appropriate conventional or mass
spectrometer (MS) detectors. No conventional GC injector is required for UNITY 2 operation. Ready and
external start connections are required on the GC.
2.2.1 Access into the GC oven
The UNITY 2 heated transfer line is lined with 0.25 mm I.D., 0.35 mm O.D. uncoated deactivated fused
silica which butt connects with the capillary analytical column inside your GC oven.
It is important that the heated and insulated portion of the transfer line extends as far as the skin of the
GC oven such that the GC oven heating begins at the point where heating of the transfer line ends. A 25
mm diameter access hole is thus required into the GC, with a 6.5 mm hole in the GC inner oven wall.
Further information is provided in Section 3.1.
2.2.2 GC configuration/parameter selection
From a GC perspective, UNITY 2 may simply be regarded as a multipurpose, stand alone GC injector for
capillary or 1/8 inch packed columns. No conventional GC injector is required for UNITY 2 operation. The
rest of the GC system - column, oven, data handling, detector, etc. - should be configured and used, as per
normal chromatographic practice for the analytes of interest.
If multiple applications are to be carried out or if samples are uncharacterised; for example when
monitoring unknown atmospheres, a good general purpose GC configuration comprises 25-30 m, 0.25mm
or 0.32 mm ID, 1 or 2 µm phase thickness bonded methyl silicone capillary column with a FID or mass
spectrometer detector.
2.3 Laboratory location
2.3.1 Space requirements
UNITY 2 can sit either side of the gas chromatograph.
Efficient cold trap cooling requires at least a 10 cm gap on both sides of UNITY 2

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2.3.2 Quality of the laboratory air
UNITY 2 is a powerful concentration device and is often used to determine trace levels of organic
analytes. It is advisable to store and operate UNITY 2 in a clean laboratory environment with minimal
atmospheric concentrations of organic vapours.
2.3.3 Quality of the laboratory gas lines
As UNITY 2 is a concentrator, even trace level contaminants in laboratory gas lines can become significant
interferents in the chromatograms produced.
Recommended gas lines are refrigeration-grade copper tubing connected using approved swage-fittings.
Laboratory gas line joints and connections must never be brazed.
Position the gas supplies as close as possible to the analytical system i.e. such that the gas lines are as
short as possible.
Use a high quality, stainless steel diaphragm cylinder head regulator for the carrier gas supply.
2.4 Services
2.4.1 Power
UNITY 2 is automatically compatible with all conventional mains power supplies ranging from 100 to 240
V and 50 or 60 Hz. It is not necessary to manually select or switch voltages. The maximum power
consumption of UNITY 2 is 650 W.
2.4.2 Pressure controlled supply of dry air or nitrogen (purge gas)
UNITY 2 requires a pressure-regulated supply of dry air or nitrogen (dewpoint lower than -50°C) at
between 50 and 60 psi both to actuate the main valve and to purge the cold trap box.
It is recommended that a secondary pressure regulator be used to control the supply of dry gas to UNITY 2
in addition to that controlling the general laboratory line pressure. Any conventional pressure regulator
should suffice for this and suitable pneumatic control may already be available on your GC. Alternatively,
Markes International Ltd. supply a pneumatic control accessory (P/N U-GAS01) for both air and carrier
gas.
It is recommended that the pressure in the laboratory air line be at least 10 psi higher than that supplied
to UNITY 2.
2.4.3 Pressure controlled carrier gas supply
Helium is invariably used as the carrier gas for capillary chromatography and nitrogen for packed column
or sensor work.
5.0 grade (i.e. 99.999%) or higher purity helium / nitrogen gas is recommended in either case.
Although Hydrogen may be used as a carrier gas for standard GC and thermal desorption applications,
care must be taken in case the high temperatures involved in thermal desorption cause hydrogenation of
reactive and/or unsaturated species.
UNITY 2 requires a regulated supply of carrier gas at a pressure to suit the analytical column / system
selected. The UNITY 2 gas flow path has minimum (<2 psi) impact on total system impedance. Suitable
pneumatic control for the carrier gas may already be available on your GC. The performance of most

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common capillary columns is optimised at between 1 and 2 ml/min typically requiring between 10 and 30
psi head pressure.
High quality pressure regulators incorporating a stainless steel diaphragm are recommended for carrier
gas control.
The pressure in the laboratory carrier gas line should be at least 10 psi higher than that supplied to UNITY
2.
2.4.4 Filters
Deoxo and organic filters should be included in the carrier gas line just upstream of connection to the
UNITY 2 - GC analytical system (see Accessories for Thermal Desorption catalogue).
2.4.5 UNITY 2 and Electronic Carrier Control (ECC)
Please refer to the UNITY 2 ECC Installation Manual.
For optimum performance the carrier gas pressure to the ECC module should be regulated to
approximately 10 to 15 psi above the column head pressure.
NOTE: As ECC only controls the carrier gas, suitable pneumatic control of the dry gas will still be required.
A U-GAS01 from Markes International includes a carrier gas regulator to step down the carrier
pressure and a separate regulator and gauge for control of the dry air or nitrogen, and is therefore
recommended in this case.
2.5 Unpacking UNITY 2
Remove the instrument from its packaging.
It is strongly recommended that the instrument packaging is retained for future use if ever the system is to
be shipped using conventional carriers. Shipping the instrument in non-standard packaging may
irreversibly damage the equipment and invalidate the warranty.

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3. Installing UNITY 2
3.1 Installing the Transfer Line
UNITY 2 is supplied with a universal transfer line to convey desorbed analytes from UNITY 2 to a gas
chromatograph or other analytical system. The sample path utilises a deactivated fused silica line
(0.25mm I.D. and 0.35mm O.D.) heated over its entire length by means of a distributed heater and at the
GC end by heat conduction from the GC oven. The heated transfer line is 1 m long, which is sufficient to
reach most gas chromatographs even when a mass spectrometer is attached.
NOTE: The parts supplied can be used in other combinations to suit particular instrument configurations.
3.1.1 Installing the Transfer Line onto the GC
There are two options for transfer line installation, one requires use of a hole in the top, side or back of the
GC oven, while the other option is to gain access via an unused heated injector port.
Option 1 – Through Hole in Oven Wall
1. Locate a hole in the inner oven wall with a corresponding hole leading to the outside of the
instrument.
2. Where necessary, displace the oven insulation material such that the transfer line heater can be
fitted directly against the external face of the oven wall.
3. Place one of the washers provided in the UNITY shipping kit on the external face of the oven wall, over
the hole through which the transfer line will be passed.
NOTE: A number of different washers are provided. The washer required will be determined by the
hole in the oven through which the transfer line will pass.
4. Fit the GC end of the UNITY transfer line through the hole in the washer and on through the hole in
the GC oven wall.
5. Place a second washer over the UNITY transfer line so that it can be secured against the inside wall of
the GC oven.
Oven wall
Oven wall

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6. Fit the clamp (SERUTD-1125) onto the transfer line, followed by the spacer (SERUTD-1232) secure
with the M6 nut supplied with the transfer.
Option 2 – Through Heated Injector Port
NOTE: This option is only suitable if the inlet will not be required at any time.
1. Remove components from the injector (e.g. septum, liner etc.) to enable the transfer line to pass
through unobstructed.
2. As the entry hole will generally be larger than the diameter of the metal line sleeve, one or more of the
large washers supplied will be needed.
Oven wall
Oven wall
Spacer
Clamp
Washer
Washer
Heated Transfer Line
Nut
Washer
Transfer Line Heater
Nut
Washer
Injector Body

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3. When in operation the injector body should be heated, and should be set to run at a temperature
equal to the UNITY 2 flow path temperature setting.
3.1.2 Installing the fused silica transfer line insert
Once the heated line has been fitted to the GC, the fused silica transfer line (SERUTD-5093) should be
installed. The fused silica transfer line comprises of deactivated fused silica tubing (0.25mm I.D. and
0.35mm O.D.) inside a PTFE sleeve.
Insert the fused silica transfer line into the heated transfer line at the GC end. Push the tubing through
the 1/8-inch aluminium tube of the heated transfer line until it protrudes from the other (UNITY 2) end of
the transfer line.
Trim the PTFE sleeve to ensure enough fused silica is exposed.
Connect the fused silica transfer line to the GC column with a quick seal column connector (C-QSC10) or
alternative connector.
3.1.3 Connecting the Transfer Line to UNITY 2
Place UNITY 2 on the bench on the most convenient side of your gas chromatograph. Ensure that the
transfer line will reach from the top of UNITY 2 to the selected entry point into the GC oven.
Ensure that UNITY 2 is switched off and cool.
1. Remove the rear top cover
a. Slide the cover backwards
b. Lift upwards
2. Remove the heated valve cover
a. Unscrew the 2 screws highlighted
b. Lift cover upwards to remove.
1. Push fused silica back into sleeve
2. Cut away enough sleeve so that ~20cm
fused silica is exposed at either end

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3. Place the 1/16 x 0.4 mm (U-
FV001
Swagelok type nut (SERZ-0157
) on loosely
4.
Insert fused silica transfer into UNITY
a.
Pull ~ 20 cm of fused silica from the PTFE line casing. Cut off the first few mm of fused silica using an
approved capillary cutting tool.
b.
Make a mark 20 mm from the end of the fused silica using typing white
marker.
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FV001
) ferrule onto the union then thread the 1/16
-
) on loosely
Insert fused silica transfer into UNITY
Pull ~ 20 cm of fused silica from the PTFE line casing. Cut off the first few mm of fused silica using an
Make a mark 20 mm from the end of the fused silica using typing white
-
out fluid or an alternative
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-
inch stainless steel
Pull ~ 20 cm of fused silica from the PTFE line casing. Cut off the first few mm of fused silica using an
out fluid or an alternative

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c. Gently feed the fused silica through the 1/16” nut and ferrule until the mark is reached.
d. Tighten the nut to trap the fused silica and then tighten a further 1/2 turn using one of the 8 mm
wrenches (spanners) provided in the shipping kit.
CAUTION: Do not over tighten or the ferrule will become distorted
5. Secure Transfer Line Assembly to UNITY 2
a. Carefully bring the clamp plate, PTFE plate and shield tube down into the position with the shield tube
covering the union nut.
b. The shield tube should be positioned such that the 1/16th side tubing projects though one of the
cutouts.
c. Push the clamp plate and PTFE plate down on to the 2 exposed threads and secure with 2 x M4 nuts
(SERZ-NM4FSS)

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6. Plug the 2 connectors highlighted into their respective sockets
3.2 Inserting Split Filter Tube
1. Check the tube receivers to ensure the white PTFE frits are present in both sample and split tube
sides.

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2. If they are missing then replace them with spares, which can be found in the shipping kit.
3. Insert the split filter tube, ensuring that the heated valve assembly does not move. If it does move
check the tube alignment.
4. Replace the heated valve surround and secure with the 2 screws removed in the first step.
NOTE: Ensure no wires are trapped under the cover edges.

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5. Replace the rear top cover.
3.3 Installing the cold trap
Ensure the power to UNITY 2 is switched OFF.
1. Remove the front top cover from UNITY 2
a. Pull the cover forward
b. Lift up the cover to remove

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2. Loosen the screw at the bottom of the Trap Pneumatics Assembly.
NOTE: It is not necessary to remove the screw completely.
3. Gently pull the Trap Pneumatics Assembly towards the front of the instrument taking care to keep it in
the horizontal plane
4. Once clear of the screw, lift the Trap Pneumatics Assembly clear and rotate to the left.

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5. Place the trap alignment tool into the cold trap box. The tool should pass smoothly up to the o-ring in
the heated valve before further gentle pressure moves the tool another 2-3 mm.
NOTE: If the tool does not move smoothly past the point where it enters the brass connector there
may be a misalignment problem that must be corrected before continuing with this
procedure.
1-2 mm
2.
1.