Specac Atmos User manual

Atmos Heating Jacket For
Atmos Gas Cells
User Manual
2I-24651-3

Atmos Heating Jacket For
Atmos Gas Cells
User Manual
2I-24651-3

Atmos Heating Jacket
3
Atmos Heating Jacket for Atmos Gas Cells
P/N GS24651 Series
CONTENTS
1. INTRODUCTION .................................................................................4
2. SAFETY CONSIDERATIONS .................................................................6
3. SPECIFICATIONS OF ATMOS HEATING JACKETS..................................11
4. CHECKLIST .....................................................................................15
5. FITTING OF THE ATMOS HEATING JACKET..........................................16
6. OPERATING PARAMETERS FOR ATMOS HEATING JACKETS..................23
7. CLEANING/CARE OF THE ATMOS HEATING JACKET .............................28
8. SPARE PARTS FOR ATMOS GAS CELLS AND HEATING JACKETS............30
9. ATMOS HEATING JACKETS SERIAL NUMBER.......................................31
BUBBLE NUMBER PARTS LEGEND .....................................................32
DECLARATION OF CONFORMITY DOCUMENTS....................................33
© July 2019 Specac Ltd. All rights reserved.
Atmos and Brilliant Spectroscopy are trademarks of Specac Ltd. Other
product names mentioned herein may be trademarks of their
respective owners.

User Manual
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1. Introduction
Thank you for purchasing a Specac product.
The Atmos Heating Jacket and its own dedicated 4000 Series
Temperature Controller allows for a long pathlength Atmos gas cell to
be used for applications where the gas to be analyzed needs to be
maintained above ambient temperature and up to 200°C. Typical
applications are for the study of the chemical reactions of gases at
elevated temperatures and the study of combustion gases that can be
directed into the Atmos gas cell.
There is an appropriate heating jacket and controller for each of the
different pathlength and size of Atmos gas cells. These are:
P/N GS24651: Heating jacket and controller for A2.5 gas cell
P/N GS24652: Heating jacket and controller for A5 gas cell
P/N GS24653: Heating jacket and controller for A10 as Cell
P/N GS24654: Heating jacket and controller for A20 gas Cell
The Atmos heating jacket is designed to fit and close around the metal
body of the Atmos gas cell.
The heating jacket overall is constructed using two inner C-section metal
clamping bodies that are hinged together with one of the C-sections
fitted with heating cartridges. The inner heating jacket is covered by an
outer heat resistant fabric based insulating body. The inner body makes
direct metal to metal contact with the body of the gas cell.
When power is applied to the heating cartridges in the inner clamping
body, heat is conducted quickly and evenly throughout the gas cell body
itself. The surrounding outer insulating body fabric reduces heat losses
ensuring efficient heat distribution throughout the gas cell with good
temperature stability. An important aspect of even heat distribution
throughout the gas cell environment from the top to bottom is to
eliminate any local “cool spots” and prevents condensation forming on
the internal mirrors and window surfaces. A controlling thermocouple
located in the middle of the inner clamping body, indicates that a

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5
temperature set for the gas cell body will show very little variation
throughout the entire length of the gas cell.
The thermocouple lead connection is combined with the power cable
lead attached to the inner heating jacket and the heating jacket is
connected to the 4000 series temperature controller via the power cable
lead using a six-way screw plug fixing.
Power to the Atmos heating jacket is supplied by a dedicated 4000
series temperature controller. A separate user instruction manual for the
4000 Series temperature controller is supplied for use with the Atmos
heating jacket instructions.
Atmos Heating Jacket as fitted to an Atmos Gas Cell

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2. Safety Considerations
List of Safety Symbols
Safety Symbol
Meaning
General Caution.
(Reference ISO 7000-0434B, 2004-01)
Caution –Hot Surface.
Reference IEC 60417-5041, 2002-10)
Caution –Possibility of Electric Shock
Indoor Use Only
Important! Before use of the Atmos heating jacket and
controller with your own specific Atmos gas cell, please
follow the safety advice for use of the Atmos gas cell
itself as found from the Safety Considerations section
in its own user instruction manual (2I-24602-3).
Warning: When an Atmos gas cell is connected for to its
dedicated 4000 Series temperature controller, the
equipment must be used indoors only within an operational
environment of between 5°C and 40°C.

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7
In use of an Atmos gas cell with its own heating jacket for
the study of gaseous/vapour sample types, there is an
increased risk associated with operation at elevated
temperatures up to 200°C. Parts of the gas cell system will
become hot under such operating conditions and so there should be
avoidance as much as possible for touching the equipment when the
heating jacket is powered and hot.
Electrical Safety Class
The Atmos heating jacket and controller has been designed
and tested in accordance with BS EN 61010-1 and 61010-
2-010 and has been supplied in a safe condition. This
accompanying instruction manual contains some
information and warning notes, which must be followed by the user to
ensure safe operation and retain the apparatus in a safe condition.
General Operational Safety Use
Warning: Users must follow appropriate safety protocols for
the sample they are testing. Use of a fume cupboard is
recommended for hazardous samples. Users must have
appropriate training in spectroscopy and handling the
samples being tested. A risk assessment is required when using a
hazardous sample.
Warning: The Atmos A10 and A20 gas cells of the range
are tall and relatively heavy and pose a stability risk when
handling. Care should be taken when transporting them and
fitting them into the spectrometer. During storage, conditions should be
met to prevent them from falling over. It may be useful to store the gas
cell in its original packaging for safe keeping.
Warning: If operating an Atmos gas cell at above ambient
temperature measurement conditions in use with its own,
dedicated heating jacket and controller system, do not
carry the gas cell with the heating jacket attached. The outer

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jacket sleeve insulation may slide away from the gas cell body, or it may
be too slippery to hold. Fit the heating jacket components when the gas
cell is near to or installed into the spectrometer system.
Warning: The maximum temperature of operation for the
heating jacket itself is 210°C and should not be exceeded.
When the heating jacket has stabilised at this maximum
setting, this provides for an internal gas temperature within
the gas cell itself at around 200-210°C.
Warning: The appropriate Atmos heating jacket must be
fitted to its dedicated size of Atmos gas cell before it is
heated.
Warning: Do not move or touch the heating jacket on the
Atmos gas cell whilst it is operating above ambient
temperature conditions. Metal surfaces of the gas cell and
any gas flow connection tubing will get hot when the heating
jacket is in use. These components should not be touched when the
heating jacket is hot. Always check the actual temperature level of the
heating jacket from the heating jacket controller system display and wait
until the level has stabilised to ambient/room temperature conditions
before touching or moving the Atmos gas cell.
Warning: Do not use any organic solvents and use a cloth
dampened with water to clean the heating jacket. Allow the
heating jacket to be at room temperature and disconnect the
heating jacket from its temperature controller system before
attempting any cleaning. Use a water dampened cloth when powered
down only.
Warning: The pressure of a gaseous environment within an
enclosed system for a set volume increases with
temperature. The Atmos gas cell must not exceed its rated
pressure maximum (125psi) when heated and if being

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9
operated under non-flow conditions. Specac advise fitting a pressure
relief valve (P/N GS24160), along with appropriate open/close valve tap
connections (P/N GS24161), or to monitor the pressure to prevent for
any over-pressurisation to the system. (Please check information
found on pages 28 to 32 for Section 7), of the Atmos gas cell
instruction manual 2I-24602-3.
Important Notes For Safety In Operation
Avoid burns! Some parts of the Atmos gas cell and
heating jacket will be hot and should not be handled or
touched with bare hands when the heating jacket is
operating and hot. (e.g. inlet and outlet tubing, the outer
insulating jacket (3) surface and the top section (20) of the optical unit.)
In normal operation at a 200°C setting, the temperature at the top
section (24) of the optical unit box would be about 50°C, the inlet and
outlet tubing would be at 200°C and the insulating jacket (3) would be
circa 85°C; for an ambient temperature maximum of 40°C.
Do not remove the Atmos heating jacket from the gas
cell when hot. If it is necessary to do so, then wear heat
protective gloves and make sure the 4000 series
temperature controller is switched off. Rest the heating
jacket assembly on a bench with none of the metal parts in contact with
the bench. (Use a heat protective surface such as layers of cloth.) Open
both the insulating jacket (3) and inner heating jacket (1) to allow for
faster cooling to return the Atmos heating jacket to room temperature
conditions.
Note: If the Atmos heating jacket is removed from the gas cell during
the experiment for a period of more than 5 minutes, turn the 4000
series temperature controller power switch to off.
The Atmos heating jacket is fitted with a thermal fuse located in the inner
metal heating jacket assembly (1). Should there be a failure of the
thermocouple or if the heating jacket is misused, overheating will occur.

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As a safety precaution the thermal fuse will blow to stop overheating
(thermal run-away) of the Atmos heating jacket and gas cell when the
temperature of the inner heating jacket (1) exceeds 210°C.
Warning: In the event of a blown thermal fuse, the Atmos
heating jacket with its 4000 Series temperature controller
should be returned to Specac for repair. The serial number
of the equipment will be required for reference.
End of Lifetime Equipment Use
If or when the Atmos gas cell, its heating jacket system or
any of the consumable items such as windows, seals or
mirror parts have reached their limit of lifetime and need to
be replaced, use appropriate WEEE and other local
regulations for the safe disposal of electrical equipment
and toxic chemicals.

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3. Specifications of Atmos Heating Jackets
The Atmos heating jacket and controller systems supplied under the part
numbers GS24651 (for A2.5 gas cell), GS24652 (for A5 gas cell),
GS24653 (for A10 gas cell) and GS24654 (for A20 gas cell), have the
following specifications.
A table for the Atmos heating jackets with their dimensions and as
comparative images for their size are shown below.
Atmos Heating
Jacket
Height from
Optical Axis (mm)
Jacket Outside Diameter
(Maximum Diameter mm)
A2.5 Gas Cell
192
124 (124)
A5 Gas Cell
237
136 (136)
A10 Gas Cell
357
140 (180)
A20 Gas Cell
562
140 (180)

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The images of the Atmos heating jackets as fitted to their corresponding
size of Atmos gas cells have been shown for their overall height
dimension from the optical axis (light beam) centerline reference.

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Weight of Atmos Heating Jacket
Atmos Heating Jacket
Weight - Kilograms
GS24651 –A2.5 Gas Cell
0.4
GS24652 –A5 Gas Cell
0.85
GS24653 –A10 Gas Cell
1.5
GS24654 –A20 Gas Cell
2.8
Specifications of Atmos Heating Jackets GS24651, GS24652,
GS24653 and GS24654
Operating Temperature range: ambient to 200°C.
Thermocouple: K Type (Chromel-Alumel).
Heating rate (metal body): 90 mins ambient to 200°C (Or:2°C / min).
Heating rate (gas –air NTP): 90 min ambient to 200°C (Or: 2°C / min).
Stability time (gas –air NTP): 30 mins after cell reaching 200°C.
Cooling rate: 90 mins.
Voltage for operation: low voltage (30 volts).
Storage - temperature: 0 to 35°C.
Storage - humidity: 0 to 95%.
Specifications Pertaining to Use Configured with the Dedicated
4000 Series Temperature Controller
Temperature set steps: 1°C.
Temperature stability: 1°C RMS.
Thermocouple accuracy: 1.5°C at 200 °C.
Maximum power from controller: 600 Watts.
Maximum heating ramp rate: 10°C per min.
Specifications Pertaining to the Dedicated 4000 Series
Temperature Controller
The 4000 series temperature controller is supplied for connection to a
220/230 volts AC 110volts AC or 100 volts AC mains supply depending
on a country of operation. The output voltage supply for operation of the
Atmos heating jacket is 30 volts DC.

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The configuration for a 4000 series temperature controller for the
specific mains voltage supply is tabulated below.
Voltage
(Volts)
Frequency
(Hertz)
Max Power
(Watts)
Fuse Rating
(Amperes)
Fuse Type
230
50
600
5
T
110
60
600
8
T
The insulation rating of external circuits (appropriate for single fault
condition) = basic insulation and protective (earth) bonding.
The humidity levels for the operation range is from 0% to 95% relative
humidity and non-condensing.

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4. Checklist
On receipt of your Atmos heating jacket and 4000 series temperature
controller system please check that the following have been supplied:
•Atmos heating jacket for appropriate A2.5, A5, A10 or A20 Atmos
gas cell.
•4000 Series temperature controller and mains power cable.
•USB memory stick that has user instruction manuals for the Atmos
heating jacket and 4000 Series temperature controller.
The Atmos heating jacket and its dedicated 4000 series temperature
controller are supplied as separate items. Carefully remove these items
from their packaging and proceed to install as per instructions.

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5. Fitting of the Heating Jacket
General Note
Depending on the sample compartment area and space available in the
spectrometer, it may be advisable to fit an Atmos heating jacket to its
appropriately sized Atmos gas cell prior to fitting the gas cell to a Lever-
lock baseplate for installation into the spectrometer. (See how to fit an
Atmos gas cell to a Lever-lock baseplate from the Atmos gas cell
user instruction manual 2I-24602-3.)
Some spectrometer sample compartments may be too small and
restrictive to allow for an opening and closing of the heated jacket parts.
In addition, if there are any gas inlet/outlet pipework plumbing
connections to be made to the Atmos gas cell (e.g. pressure gauge P/N
GS24160, flow taps P/N GS24161 or gas temperature sensing
thermocouple P/N GS24641), these may be more easily achievable with
the Atmos heating jacket already fitted to the Atmos gas cell and when
installed into the spectrometer sample compartment.
For explanation in fitting of an Atmos heating jacket, the A5 Atmos gas
cell size has been used in figures/images as an example.
The Atmos Heating Jacket
The Atmos heating jacket is a twin jacket component assembly of parts.
(An inner heating jacket assembly (1) and outer insulating jacket (3) -
please see Fig 1.)
The inner heating jacket assembly (1) consists of two “C” section
metal bodied parts that are hinged together allowing for the heating
jacket to be opened and to fit around the metal body (28) of the Atmos
gas cell. When fitted around the metal body (28), the hinged C-section
parts of the inner heating jacket (1) are closed together and held
securely shut by a tab clip bracket mechanism (2). The inner heating
jacket assembly (1) has a K-type thermocouple fitted to one of the C
section metal body parts to monitor and control the temperature of the

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Atmos gas cell body (28) when being heated. The power lead cable is
also fitted directly to the inner heating jacket assembly (1).
The outer insulating jacket (3) consists of a heat resistant fabric casing
surrounding the metal inner heating jacket (1). When the inner heating
jacket (1) is closed to fit around the Atmos gas cell metal body (28), the
outer insulating jacket (3) can be placed to cover and envelop the
heating jacket (1). The insulating jacket (3) is held securely in place
using fabric flap tabs (4) affixed over Velcro fastening strips (5).
Fig 1. Atmos A5 Size Heating Jacket
3
2
1
5
4
3
4

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Note: The A2.5 and A5 size heating jacket assemblies have one tab
clip bracket mechanism (2) for keeping the inner heating jacket
(1) closed, whereas the larger A10 and A20 Atmos gas cell
heating jackets (1) have two tab clip brackets (2) for closing.
Fitting the Inner Heating Jacket (1) to the Atmos Gas Cell
Having removed the Atmos gas cell from any Lever-lock baseplate
mount fixing, position the Atmos gas cell onto a level workspace area.
With the outer insulating jacket (3) removed, open the inner heating
jacket assembly (1) (as seen in Fig 1.) by undoing the clip tab bracket
(2).
Fig 2. shows a close-up detail of the tab clip bracket (2) fixing. To open
the inner heating jacket (1), the tab (6) is pulled outwards to release the
clip (7) from its catch (8) and then the two “C” section bodies can be
hinged apart. To close and lock the inner heating jacket (1), bring the
two “C” section bodies opening edges close together (1) and engage the
clip (7) over the catch (8). Then push the tab (6) to pull the two hinged
“C” section bodies (1) together for a tight close fit.
Fig 2. Tab Clip Bracket (2) on Inner Heating Jacket (1)
7
8
6

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With the inner heating jacket (1) parts opened as wide as possible,
carefully lift the heating jacket assembly (1) to lower over and surround
the metal body (28) of the Atmos gas cell. The underside edge of the
heating jacket assembly (3) should come to rest on the top surface of
the lower screw fixing flange ring for the Atmos gas cell body (28). (See
Fig 3.)
Fig 3. Opened Heating Jacket Positioned Over Atmos Gas Cell
3
24
3
1
28
4
5
5
5
2

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Now close the inner heating jacket assembly (1) against the metal cell
body (28) by bringing the two hinged “C” section bodies together and
locking them shut with the tab clip bracket (2). The inner heating jacket
(1) should now make a good, close, contacting fit with the metal body of
the gas cell (28).
Warning! Do not trap any leads for the power or
thermocouple connections, or any insulation material within,
under the inner heating jacket assembly (1) before closing it.
Fitting the Outer Insulating Jacket (3)
Take the outer insulating jacket
(3) fabric casing to cover over
the closed heating jacket
assembly (1) correctly. Affix the
fabric flaps (4) at the top and
side of the insulating jacket (3) to
their corresponding Velcro strip
pads (5) to keep the outer
insulating jacket (3) securely
closed. The underside edge of
the outer insulating jacket (3)
should come to rest on the top
section (24) of the optical unit for
the Atmos gas cell. (See Fig 3.)
The completed, correct fitting of
the outer insulating jacket (3) to
an Atmos A5 gas cell is shown
as Fig 4.)
Fig 4. Heating Jacket Fitted To A5 Atmos Gas Cell