Parr Instrument 1341 User Manual
204M
1341
Plain Jacket Calorimeter
Operating Instruction Manual
Table of Contents
Preface 3
Scope 3
Related Instructions 3
Important Information 3
Intended Usage 3
Explanation of Symbols 4
Safety Information 4
General Specifications 4
Environmental Conditions 4
Provisions for Lifting and Carrying 4
Assemble the Calorimeter 5
Operating the 1108 Oxygen Vessel 5
Operating the Calorimeter 6
Discussion of Calculations 11
Acid Correction 11
Sulfur Correction 11
Fuse Wire Correction 11
Radiation Correction 11
Magnitude of Errors 12
Maintenance 12
Calorimeter Maintenance 12
General Cleaning Instructions 12
Fuse Ratings 12
Electric Ignition Problems 12
6772 Calorimetric Thermometer 13
Electrical Hookup of Thermometer to Calorimeter 14
Calculating the Heat of Combustion 8
Assembly of Data 8
Temperature Rise 8
Gross Heat of Combustion 9
Conversion to Other Bases 9
Standardizing the Calorimeter 10
The Energy Equivalent Factor 10
Standard Samples 10
Standardization Procedure 10
Parts for the 1341 Calorimeter 15
Customer Service
Questions concerning the installation or operation
of this instrument can be answered by the Parr
Customer Service Department:
1-309-762-7716 • 1-800-872-7720
Fax: 1-309-762-9453
E-mail: parr@parrinst.com
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Parr Instrument Company
1341 Plain Jacket Calorimeter
Preface
Scope
These instructions cover the steps to be taken in
setting up and operating a Parr 1341 Plain Jacket
Calorimeter. The user should study these instructions carefully before starting to use the calorimeter
so that they will fully understand the capabilities of
the equipment, and be well aware of the safety precautions to be observed in its operation. Instructions
covering the operation of the 1108 Oxygen Combustion Vessel and the use of other related apparatus
are provided in separate instruction manuals listed
below. The separate manuals which apply to a
particular calorimeter installation should be added
to and made a part of these instructions.
Related Instructions
No. Description
205M Operating Instructions for the 1108
Oxygen Combustion Vessel
207M Analytical Methods for Oxygen Bombs
545M Operating Instructions for 6775/6775A
Digital Thermometer
201M Limited Warranty
Important Information
Your Parr 1341 Plain Jacket Calorimeter has been designed with function, reliability, and safety in mind.
It is your responsibility to install it in conformance
with local electrical codes.
This manual contains important operating and
safety information. You must carefully read and understand the contents of this manual prior to the use
of this equipment. For safe operation, please pay
attention to the alert signals throughout the manual.
Intended Usage
Do not use this equipment for anything other than
its intended usage. Protection provided by the
equipment may be impaired if used in a manner not
specified by Parr Instrument Company. This instrument is to be used indoors.
Note About Nomenclature:
Historically, burning a sample enclosed in a
high pressure oxygen environment is known
as Oxygen Bomb Calorimetry and the vessel
containing the sample is known as an Oxygen
Bomb. The terms bomb and vessel are used
interchangeably.
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1341 Plain Jacket Calorimeter
Explanation of Symbols
This CAUTION symbol may be present on the Product Instrumentation and
literature. If present on the product, the user must consult the appropriate
part of the accompanying product literature for more information.
Protective Earth (PE) terminal. Provided for connection of the Protective
Earth (green or green/yellow) supply system conductor.
Safety Information
To avoid electrical shock, always:
1. Use a properly grounded electrical outlet of
correct voltage and current handling capability.
2. Ensure that the equipment is connected to
electrical service according to local national
electrical codes. Failure to properly connect may
create a fire or shock hazard.
3. For continued protection against possible
hazard, replace fuses with same type and rating
of fuse.
4. Disconnect from the power supply before
maintenance or servicing.
To avoid personal injury:
1. Do not use in the presence of flammable or
combustible materials; fire or explosion may
result. This device contains components which
may ignite such material.
2. Refer servicing to qualified personnel.
General Specifications
Electrical Ratings
Plain Jacket Calorimeters:
Model 1341EB: 115VAC, 0.30 Amps, 60 Hz
Model 1341EE: 230VAC, 0.15 Amps, 50/60 Hz
Before connecting the calorimeter to an electrical
outlet, the user must be certain that the electrical
outlet has an earth ground connection and that the
line, load and other characteristics of the installation
do not exceed the following limits:
Voltage: Fluctuations in the line voltage should not
exceed 10% of the rated nominal voltage shown on
the data plate.
Frequency: Calorimeters can be operated from
either a 50 or 60 Hertz power supply without affecting their operation or calibration.
Current: The total current drawn should not exceed
the rating shown on the data plate on the calorimeter by more than 10 percent.
Environmental Conditions
Operating: 15 ºC to 40 ºC; maximum relative humidity of 80% non-condensing.
Installation Category II (over voltage) in accordance
with IEC 664.
Pollution degree 2 in accordance with IEC 664.
Altitude Limit: 2,000 meters.
Storage: -25 ºC and 65 ºC; 10% to 85% relative
humidity.
Ignition Units:
2901EB: 115 VAC, 50/60 Hz, 4.0 Amps
2901EE: 230 VAC, 50/60 Hz, 2.0 Amps
2901EU: 230 VAC, 50/60 Hz, 2.0 Amps
2901EX: 230 VAC, 50/60 Hz, 2.0 Amps
2901EZ: 230 VAC, 50/60 Hz, 2.0 Amps
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Parr Instrument Company
Provisions for Lifting and Carrying
Before moving the instrument, disconnect all connections from the rear of the apparatus. Lift the
instrument by grabbing underneath each corner.
1341 Plain Jacket Calorimeter
Assemble the Calorimeter
1. Unpack the calorimeter carefully and check the
individual parts against the packing list. If shipping damage is discovered, report it immediately to the delivering carrier. Unpack the jacket
first and set it on a sturdy bench or table in a
location that is reasonably free from drafts and
is protected from sources of radiant heat, preferably in an air conditioned room. Temperature
changes in the room should be minimal.
There should be convenient access to running
water, to a drain and to an appropriate grounded
electrical outlet. About 8 square feet of workspace will be required. Access to a chemical balance sensitive to 0.1 mg and to a solution, trip or
torsion balance capable of weighing up to 3.0 kg
with 0.1 g sensitivity will be required. A standard 1A cylinder with a purity of 99.5% is usually
sufficient for bomb combustion purposes.
2. Set the cover on the jacket. Remove the two
screws from the side of the jacket and attach the
stirrer drive motor. Check the stirrer shaft to be
sure that it turns freely and slip the drive belt
onto the motor and stirrer pulleys.
3. Assemble the cover support stands. Two stands
are furnished, each consisting of a base, a support rod and ring to be clamped to the upper end
of the rod. The A37A stand with the large ring is
used to support the calorimeter cover when it is
removed from the jacket, while the A38A stand
with the smaller ring supports the bomb head
when attaching the fuse wire and arranging the
fuel capsule.
4. Install the thermistor by sliding it through the
opening in the calorimeter cover. Adjust the
length of the thermistor to match the length of
the stirring shaft. Hand tighten the nut to secure
the thermistor.
Note: Do not over tighten the nut.
The single dimple must always face forward
when setting the bucket in the jacket.
6. Connect the ignition unit. While any electrical
system capable of furnishing approximately 23
volts can be used to ignite the fuse in the oxygen
bomb, most users will prefer to use a Parr 2901
Ignition Unit for this purpose. This unit operates
from any standard electrical outlet to provide the
proper low voltage firing current, providing also
a convenient push switch, indicating lamp and
connecting terminals.
Connect one of the lead wires from the calorimeter jacket to the terminal labeled “10CM”.
Connect the second lead to the terminal labeled
“Common”. Plug the power cord into an appropriately grounded electrical outlet. The power
supply cord is the main electrical disconnect
device for the ignition unit. After the unit has
been plugged into an outlet do not press the
firing button unless the lead wires inside the
jacket are connected to the combustion vessel.
Caution!
If the bare terminals on these wires happen
to be in contact with each other or with a
metal object when the circuit is closed, the
resulting short-circuit may cause serious
damage to the ignition system.
7. Attach the oxygen filling connection. Unscrew
the protecting cap from the oxygen tank and
inspect the threads on the valve outlet to be sure
they are clean and in good condition. Place the
ball end of the 1825 Oxygen Filling Connection
into the outlet socket and draw up the union
nut tightly with a wrench, keeping the 0-55 atm.
gage in an upright position.
Operating instructions for the 1825 Oxygen Filling
Connection are provided in Instruction Manual
205M for the 1108 Oxygen Combustion Vessel.
Once installed, the thermistor can remain attached to the cover during all operations. Do not
lay the cover on the tabletop. Always set it in
the supporting ring on the A37A stand to protect
the thermistor and stirring shafts.
5. Check the calorimeter bucket, noting the three
dimples in the bottom of the bucket which rest
on supporting pins in the bottom of the jacket.
Operating the 1108 Oxygen Vessel
Detailed instructions for preparing the sample and
charging the 1108 Oxygen Combustion Vessel are
given in Instruction Manual, No. 205M. Follow
these instructions carefully, giving particular attention to the precautions to be observed in charging
and handling the bomb.
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