There is, however, an important limitation to
be observed: the 6725 Calorimeter must not
be used for testing self-oxidizing samples if
the reaction liberates a considerable amount
of gas, due to the dangerous high pressures
which might develop within the bomb.
A 22 mL Oxygen Bomb
The 1109A Oxygen Bomb used in the 6725
Calorimeter is the smallest of all Parr oxygen
bombs. This 22 mL bomb will handle samples
ranging from 25 to 200 milligrams, liberating
up to 1200 calories when burned in oxygen,
using initial oxygen pressures up to 35 atmo-
spheres. Outputs up to 2400 calories can be
accommodated if the sample is self-oxidizing,
provided it is burned in an inert atmosphere
and does not produce gas. Combustion in
oxygen must be limited to a maximum output
of 1200 calories.
The 1109A Semimicro Oxygen Bomb is a
manual sealing design. The head is equipped
with an inlet/outlet valve for oxygen filling
and release, and insulated and grounded elec-
trodes for the firing circuit.
6725 Semimicro Bomb Calorimeter Shown with the 6772 Calorimetric Thermometer
The 6725 Semimicro Bomb Calorimeter for measuring the calorific value of
small combustible samples.
Model 6725 Semimicro Bomb Calorimeter
P a r r I n s t r u m e n t C o m p a n y
8
w w w . p a r r i n s t . c o m
T
he 6725 Semimicro Bomb Calorimeter
is a compact and easily operated, static
jacket, combustion calorimeter designed spe-
cifically for measuring the heat produced by
the combustion of small samples when only
limited amounts of test material are available.
It is equally useful for procedures in which
it would be difficult to obtain a measurable
temperature rise in a standard calorimeter, or
where the nature of the sample makes semi-
micro operation desirable.
Many applications
The ability of the 6725 Calorimeter to pro-
duce complete combustion and a measurable
temperature rise with small samples in the 25
to 200 milligram range makes this an excel-
lent instrument for use in marine biology and
related ecological studies where only limited
amounts of sample are available. It also can
be used for testing a variety of heat powders
and pyrotechnic mixtures, particularly slow
burning thermite types which are used to
produce heat. Samples which contain their
own oxidizers can be burned in an inert atmo-
sphere, while others can be burned in oxygen.
S P E C I F I C A T I O N S
Model Number:
6725
Tests Per Hour:
2 – 3
Operator Time Per Test:
6 – 10 Minutes
Precision Classification:
0.4% Class
Jacket Type:
Compensated, Dewar Flask
Oxygen Fill:
Manual
Bucket Fill:
Manual
Bomb Model Options:
1109A, 22mL Manual Valve,
Semi-Micro Bomb
Balance Communication:
USB
Printer Communication:
USB
Network Connection:
TCP/IP via Ethernet
Dimensions (cm):
6775: 22w x 33d x 33h
6772: 56w x 36d x 31h
