1341 Ordering Guide
1341 Plain Calorimeter
Model No.
Voltage
Description
1341EB
115V 50/60 Hz
Bomb Calorimeter with 1108 Oxygen Bomb
1341EE
230V 50/60 Hz
Bomb Calorimeter with 1108 Oxygen Bomb
2901EB
115V 50/60 Hz
Ignition Unit
2901EE
230V 50/60 Hz
Ignition Unit
1349B
NA
Spare Parts Kit for 1341 Calorimeter
in an oxygen bomb. Calorific tests
for coal and solid fuels are made in
accordance with ASTM Standard Test
Method D5865, “Standard Test Method
for Gross Calorific Value of Coal and
Coke.” The 1341 Calorimeter is also
an excellent instrument for teaching
calorimetry and heat measurement
techniques in a student laboratory
since it provides all of the instrumen-
tation needed for such tests, but with
each element in the system reduced to
fundamental forms.
Although commonly called a
“plain” calorimeter because of its
simple design, technically this is a
static jacket instrument which operates
at or near room temperature with no
provision for temperature adjustment
or control. Compensation for any heat
loss (or gain) during a test is made
by applying a correction computed
from heat leak measurements taken
immediately before and after each
test. Because of the additional time
required for these measurements, the
speed with which a test can be per-
formed in this calorimeter is slower
than in a microprocessor controlled,
automatic model. Ten or twelve tests
can be completed in an eight hour day,
whereas approximately five times this
number can be run in the same period
using a Parr Automatic Calorimeter.
Good Repeatability
Good repeatability can be obtained
with the 1341 Calorimeter provided
that the temperature rise and the heat
leak correction are measured and
applied carefully. When operated with
the standard 6775 Digital Thermometer
supplied with the instrument, standard
deviations in a series of tests with a
uniform sample, such as benzoic acid,
should not exceed 0.3%. This repeat-
ability can be improved by using a
Parr 6772 Calorimetric Thermometer.
Users requiring better precision should
consider one of the other Parr calorim-
eters. Values obtained when testing a
non-homogeneous material, such as
coal, may show a wider spread than
when testing a uniform material.
An Effective Thermal Jacket
The 1341 Calorimeter has a high
strength, molded fiberglass jacket
formed with double walls and a double
cover to provide an oval chamber for
the calorimeter bucket which is com-
pletely surrounded by sealed, dead air
space. This simple yet effective insu-
lating system allows very little heat
transfer between the calorimeter and
its surroundings. A stirring shaft and
thermister are attached to the cover
and are removed with the cover when
the calorimeter is opened. Stirring is
provided by a small motor attached to
the jacket but sufficiently removed so
that it does not add heat to the
system. A pair of wires with banana
plugs carry the firing circuit to term-
inals on the bomb head. Outside
dimensions of the cylindrical jacket
are 10-7/8" dia. X 10-3/4" high.
Calorimetric Thermometers
Each 1341 Calorimeter is equipped
with a Parr 6775 Digital Thermometer.
Parr test certificates are furnished for
each thermometer.
For easier measurements and auto-
matic calculation of results, Parr offers
the 6772 Calorimetric Thermometer.
1341 Calorimeter Cross Section
Ignition Unit
The only additional accessory
needed for the 1341 Calorimeter is a
Parr 2901 Ignition Unit which supplies
the proper electric current for firing the
oxygen bomb. This unit must be listed
specifically when ordering a 1341
Calorimeter since it is priced separately
and is not included as part of the calo-
rimeter. The 2901 unit operates from
a 115 volt line and has a push switch,
indicator light and output terminals on
its top panel. Ignition units for 230 volt
operation are available also.
1 3 4 1 S e r i e s P l a i n O x y g e n B o m b C a l o r i m e t e r s
3
1 - 8 0 0 - 8 7 2 - 7 7 2 0
