Markes International UNITY-Air Server-xr User manual

QUI-1122
Version 1.1 February 2017
Markes International Ltd
T: [phone] F: [phone] E: [email protected]
www.markes.com
Installation manual
UNITY–Air Server-xr

QUI-1122
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Markes International Ltd
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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 ........................................................................................................... 5
1.4.1 Labels/symbols............................................................................................................... 5
1.4.2 Mains voltages ................................................................................................................ 5
1.4.3 High temperatures.......................................................................................................... 6
1.4.4 Cleaning and decontamination...................................................................................... 6
1.5 Environment operating conditions .............................................................................................. 6
1.5.1 Temperature.................................................................................................................... 6
1.5.2 Humidity .......................................................................................................................... 6
1.5.3 Altitude ............................................................................................................................ 6
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–Air Server-xr Pre-installation Check List .............................................................................8
2.1 Minimum computer specification for UNITY–Air Server-xr 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 ...................................................................................................................... 9
2.3.1 Space requirements ....................................................................................................... 9
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.......................................................................... 10
2.4.4 Filters............................................................................................................................... 10
3. Installing UNITY–Air Server-xr..........................................................................................................11
3.1 Unpacking UNITY–Air Server-xr ................................................................................................... 11
3.2 Connections to UNITY–Air Server-xr ............................................................................................ 11
3.2.1 Gas connections ............................................................................................................. 12
3.2.2 UNITY–Air Server-xr with Electronic Carrier Control (ECC) ........................................... 12
3.2.3 UNITY–Air Server-xr without Electronic Carrier Control (ECC) / T’d option................. 13
3.2.4 Cable connections .......................................................................................................... 14
3.3 Installing the Transfer Line .......................................................................................................... 14

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3.3.1 Installing the Transfer Line onto the GC ....................................................................... 14
3.3.2 Installing the fused silica transfer line insert................................................................ 16
3.3.3 Connecting the transfer line to UNITY–Air Server-xr .................................................... 17
3.4 Installing the cold trap ................................................................................................................. 20
3.5 Connecting the Air Server-xr to the UNITY-xr .............................................................................. 23
3.6 Sample line connection ............................................................................................................... 24
3.7 Configuring the dryer (optional)................................................................................................... 24
3.8 Check for gas leaks...................................................................................................................... 27
4. Installing Markes Instrument Control (MIC) software....................................................................28
4.1 System Configuration................................................................................................................... 28
4.2 Running the software................................................................................................................... 28
4.2.1 Configuring the software ................................................................................................ 28
4.2.2 Detecting the UNITY–Air Server-xr................................................................................. 31
5. Installation qualification..................................................................................................................32
5.1 Leak Testing ................................................................................................................................. 32
5.2 Conditioning the cold trap ........................................................................................................... 32
5.3 System checkout.......................................................................................................................... 34
6. Configuration of UNITY–Air Server-xr Electronic Gas Control –
instrument specific guides...............................................................................................................35
6.1 UNITY–Air Server-xr Electronic Gas Control with the Agilent 6890GC...................................... 35
6.1.1 Procedure........................................................................................................................ 35
6.1.2 6890 inlet settings ......................................................................................................... 36
6.2UNITY–Air Server-xr Electronic Gas Control with the Agilent 7890GC...................................... 37
6.2.1 Procedure........................................................................................................................ 37
6.2.2 7890 Inlet Setup............................................................................................................. 38
6.2.3 7890 Inlet Settings......................................................................................................... 38
6.3UNITY–Air Server-xr Electronic Gas Control with the Shimadzu QP 2010 (Plus)
GCMS fitted with AFC ................................................................................................................... 39
6.3.1 Gas connections between UNITY–Air Server-xr and the Shimadzu AFC..................... 39
6.3.2 Configuring the Shimadzu GC software ........................................................................ 40
6.3.3 Flow stability.................................................................................................................... 41
6.3.4 Ready / Start connections between UNITY–Air Server-xr and Shimadzu GC............. 42
6.4 UNITY–Air Server-xr Electronic Gas Control with the Thermo DPFC.......................................... 43
6.4.1 Procedure........................................................................................................................ 43
6.4.2 Configuring the Thermo GC software ............................................................................ 43
6.5 UNITY–Air Server-xr Electronic Gas Control with the Thermo 1300 Series GC ........................ 44
6.5.1 Installing the Markes TD to the Thermo Scientific TRACE Series 1300 GC ............... 44
6.6 Testing the ECC setup.................................................................................................................. 47

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1. Preface
This manual provides detailed instructions for the use of the UNITY–Air Server-xr. It details the
software/hardware interface and procedure for the installation of this instrument.
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–Air Server-xr 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 complies with the essential requirements of the following applicable European Directives,
and carries the CE mark accordingly:
oLow voltage Directive 2014/35/EU
oEMC Directive 2014/30/EU
The instrument conforms to the following product safety standards:
oIEC 61010-1/EN 61010-1
oCanada: CSA C22.2 No.61010-1
oUSA: ANSI/UL 61010-1.
The instrument conforms to the following regulation on electromagnetic compatibility (EMC):
oIEC 61326-1/EN 61326-1.

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1.4 Important safety warnings
There are several important safety notices to keep in mind when installing and using this instrument.
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 at all times.
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 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.

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1.4.3 High temperatures
Several parts of the UNITY–Air Server-xr can be operated at high temperatures.
Contact with these zones whilst the system is in operation can cause serious burn
injury. These zones are:
oHeated valve.
oTube oven.
See Section 3 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
with these zones.
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:
oThe insulation of the GC transfer line.
oTop and side covers (especially directly above the heated valve).
See Section 3 for the location of these zones.
1.4.4 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.
1.5.3 Altitude
This product should not be operated above 2000m (~6500ft).

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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:
46 cm (18.1”)
Width:
27 cm (10.6”)
Depth:
54 cm (21.3”)
Weight:
19 kg (42 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).
Website: www.markes.com
E-Mail: [email protected]om
Telephone: [phone] (UK office)
[phone] (German Office)
[phone] (US office (toll-free))

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2. UNITY–Air Server-xr Pre-installation Check List
2.1 Minimum computer specification for UNITY–Air Server-xr control
UNITY–Air Server-xr 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
2 GHz Pentium (or equivalent)
RAM
1 GB
Free Disk Space
40 MB (for installation)
Operating system
Windows 7 (32 & 64 bit)
Minimum resolution
1024 x 768
Other requirements
Windows compatible keyboard and mouse, one free serial port or
USB port.
NOTE:
If the UNITY–Air Server-xr is to be installed with additional
accessories e.g ULTRA-xr, check the USB requirements of the
accessories before installation.
2.2 GC equipment requirements
UNITY–Air Server-xr is usually connected to a gas chromatograph configured with appropriate conventional
or mass spectrometer (MS) detectors. No conventional GC injector is required for UNITY–Air Server-xr
operation. Ready and external start connections are required on the GC.
2.2.1 Access into the GC oven
The 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 3.5.
2.2.2 GC configuration/parameter selection
From a GC perspective, UNITY–Air Server-xr 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–Air
Server-xr 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.

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2.3 Laboratory location
2.3.1 Space requirements
UNITY–Air Server-xr can sit either side of the gas chromatograph, allowing the transfer line to be installed
into the GC oven either through the wall or roof of the oven or through an unused injection port.
Efficient cold trap cooling requires at least a 10 cm gap on both sides of UNITY–Air Server-xr.
2.3.2 Quality of the laboratory air
UNITY–Air Server-xr is a powerful concentration device and is often used to determine trace levels of
organic analytes. It is advisable to store and operate UNITY–Air Server-xr in a clean laboratory
environment with minimal atmospheric concentrations of organic vapours.
2.3.3 Quality of the laboratory gas lines
As UNITY–Air Server-xr is a concentrator, even trace level contaminants in laboratory gas lines can cause
significant interference 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
Air Server-xr is powered by the internal power supply of UNITY-xr. No extra power supply is required.
UNITY–Air Server-xr 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–Air Server-xr is 650 W.
2.4.2 Pressure controlled supply of dry air or nitrogen (purge gas)
UNITY–Air Server-xr 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–
Air Server-xr 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–Air Server-xr.

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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.
UNITY–Air Server-xr requires a regulated supply of carrier gas at a pressure to suit the analytical column /
system selected. The UNITY–Air Server-xr 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 common capillary columns is optimised at between 1 and 2 ml/min typically
requiring between 10 and 30 psi head pressure.
Previously approved and correctly rated external gas regulator should be used with this unit. Maximum
inlet pressure must not exceed 60 psi.
The pressure in the laboratory carrier gas line should be at least 10 psi higher than that supplied to
UNITY–Air Server-xr.
2.4.4 Filters
Deoxo and organic filters should be included in the carrier gas line just upstream of connection to the
UNITY–Air Server-xr - GC analytical system (see Accessories for Thermal Desorption catalogue).

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3. Installing UNITY–Air Server-xr
3.1 Unpacking UNITY–Air Server-xr
Before unpacking the instrument ensure that the installation site meets the minimum specifications as
described in Section 2, and that the GC/GCMS and data system is installed and operating correctly.
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. It is recommended that two people unpack the instruments to minimise the lifting hazard.
Check the packing list included with the instrument to confirm the condition and completeness of ship kit
and report any problems i.e. missing or damaged parts.
3.2 Connections to UNITY–Air Server-xr
The Air Server-xr is attached directly to the right hand side of UNITY-xr, power and carrier gas are supplied
from the UNITY-xr. Therefore the connections are the same as for a UNITY-xr installation, as shown below.
Power
cable and
on/off
switch
Carrier inlet
60 psi max.
Pressure outlet
(for ECC control)
Purge Air in ~ 50 psi
UNITY-xr to GC cable
SERUTE-5142 = AGILENT GC
SERUTE-5143 = THERMO GC
SERUTE-5144 = VARIAN GC
SERUTE- 5141 = SHIMADZU/
OTHER GC
Serial port
connection
to PC

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3.2.1 Gas connections
Connect the 4mm od nylon purge gas line to the inlet on the back of the U-GAS01 regulator then connect
the outlet to the back of the UNITY-xr. Purge gas should be set to approximately 50 psi.
The UNITY-xr ships ready for Electronic Carrier Control (ECC), it is recommended however that the carrier
gas is connected to the inlet on the back of the U-GAS01 or similar step down regulator to step down the
carrier pressure supply to the GC (Carrier pressure should be set between 0 and 60psi depending on
dimensions of the GC column installed). The outlet for the carrier gas is then connected from the step
down regulator to the ECC module that will be suppling carrier gas to the instrument.
3.2.2 UNITY–Air Server-xr with Electronic Carrier Control (ECC)
If using the UNITY–Air Server-xr with ECC then the carrier gas and septum purge lines are connected up
directly as shown in the schematic below. Ensure that the inlet settings on the GC are set up correctly for
this.
NOTE: If ECC is not available/required please refer to section 3.2.3 to de-configure ECC on UNITY–Air
Server-xr.
See Section 6 for the relevant configuration for each major GC
GC
Septum
Purge
Carrier
UNITY-xr
Pressure
Outlet
Carrier Inlet

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3.2.3 UNITY–Air Server-xr without Electronic Carrier Control (ECC) / T’d option
If ECC is not available / required then it is possible to reconfigure the UNITY–Air Server-xr with the
septum purge line removed.
The two gas lines (carrier and septum purge) from the ECC module on the GC should be connected
externally together via a 1/8” t-piece as shown below. The third arm of the t-piece should be connected
via 1/16” – 30/1000” i.d. stainless tubing to the ‘Carrier Inlet’ on the back of UNITY-xr.
NOTE: If stainless steel tubing is unavailable, green PEEK tubing can be used in its place
In this alternate configuration there is less need to regulate the carrier gas supply to the EPC module as
close to the UNITY–Air Server-xr supply pressure in order to get stable behaviour.
Remove the right hand lower panel.
Disconnect the 1/16” t-piece shown.
Replace t-piece with a 1/16” union (SERZ-
0119), supplied in the shipping kit, connecting
the 2 vertical lines.
UNITY-xr
Pressure
Outlet
Carrier Inlet
GC
Carrier
Septum
Purge

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3.2.4 Cable connections
Connect the power cable (SERZ-0024).
Connect the UNITY–Air Server-xr to the PC using the serial cable supplied in the shipping kit (SERZ-0189).
If there are no available serial ports on the PC, use the USB-Serial cable (U-USBSR) provided.
Connect the GC cable. Depending upon the GC that is being used a different connection cable will be
required:
SERUTE-5142 = AGILENT GC
SERUTE-5143 = THERMO GC
SERUTE-5144 = VARIAN GC
SERUTE-5141 = SHIMADZU / OTHER GC
3.3 Installing the Transfer Line
UNITY–Air Server-xr is supplied with a universal transfer line (SERUTE-5330-xr) to convey desorbed
analytes from UNITY–Air Server-xr to a gas chromatograph or other analytical system. The sample path
utilises a deactivated fused silica line (0.25 mm I.D. an d 0.35 mm 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 line is 1.4 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.
3.3.1 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-xr 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-xr transfer line through the hole in the washer and on through the hole
in the GC oven wall.

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5. Place a second washer over the UNITY–Air Server-xr transfer line so that it can be secured against
the inside wall of the GC oven.
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
Oven wall
Oven wall

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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–Air Server-xr flow path temperature setting.
3.3.2 Installing the fused silica transfer line insert
Once the heated line has been fitted to the GC, the fused silica plus associated PTFE sleeving (SERUTE-
5099) (see shipping kit) are pushed from the GC end, along the 1/8-inch aluminium tube until they
protrude from the other (UNITY-xr) 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 press-fit (C-QSC10) or alternative connector.
1. Push fused silica back into
sleeve
2. Cut away enough sleeve so that
~20cm fused silica is exposed at
either end
Nut
Washer
Injector Body
Washer
Transfer Line Heater

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3.3.3 Connecting the transfer line to UNITY–Air Server-xr
Place UNITY–Air Server-xr on the bench on the most convenient side of your gas chromatograph. Ensure
that the transfer line will reach from the top of UNITY–Air Server-xr to the selected entry point into the GC
oven.
Ensure that UNITY-xr is switched off and cool.
Remove the front top cover by pulling it vertically.
Remove the heated valve shield by removing the
two screws shown and then pulling it forwards and
upwards.

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Remove the back cover by sliding it backwards.
Place the 1/16 x 0.4 mm (U-FV001 (pk 10)) ferrule
onto the union then thread the 1/16-inch stainless
steel Swagelok type nut (SERZ-0157) on loosely
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.
Make a mark 20 mm from the end of the fused
silica using typing white-out fluid or an alternative
marker.
Gently feed the fused silica through the 1/16” nut
and ferrule until the mark is reached.
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.
Do not over tighten or the ferrule will
become distorted.
20 mm
insertion
depth

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Carefully bring the clamp plate, PTFE plate and
shield tube down into the position with the shield
tube covering the union nut.
The shield tube should be positioned such that the
1/16th side tubing projects though one of the
cutouts.
Secure the transfer line to UNITY-xr using four M4
nuts.

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Plug the 2 transfer line connectors highlighted into
their respective sockets on the top deck of the
instrument.
3.4 Installing the cold trap
Ensure that UNITY–Air Server-xr is switched off and
cool.
Remove the top covers as described above if
necessary.
Remove the internal black cover by removing the
screws highlighted and carefully pulling it upwards.