Parr Instrument 6200 - Manual (Page 9)

Concept of Operation
6200 1
w w w . p a r r i n s t . c o m 7
c
haPter
1
Concept of Operation
Overview
• The 6200 Calorimeter has been designed to
provide the user with:
• A traditional design calorimeter with removable
oxygen bomb and bucket.
• A moderately priced calorimeter which uses real
time temperature measurements to determine
heat leaks using a controlled calorimeter jacket.
• A high precision calorimeter capable of
exceeding the repeatability and reproducibility
requirements of all international standard test
methods.
• A compact calorimeter requiring minimum
laboratory bench space.
• A modern intuitive graphical user interface for
ease of operation and training.
• A calorimeter with up to date digital hardware,
software and communication capabilities.
• A calorimeter that is cost effective and which can
incorporate a user’s current bombs, buckets, and
accessories.
Removable Bomb
The Model 6200 Calorimeter utilizes the Parr 1108P
Oxygen Combustion Vessel. More than 20,000 of
these reliable 1108 style oxygen combustion ves-
sels have been placed in service on a world wide
basis. This bomb features an automatic inlet check
valve and an adjustable needle valve for controlled
release of residual gasses following combustion.
They are intended for samples ranging from 0.6 to
1.2 grams with a maximum energy release of 8,000
calories per charge.
The 1108P Oxygen Combustion Vessel is made of
high-strength, high nickel stainless steel designed
to resist the corrosive acids produced in routine fuel
testing. An alternative 1108PCL vessel is available,
constructed of an alloy containing additional cobalt
and molybdenum to resist the corrosive conditions
produced when burning samples containing chlori-
nated compounds.
The Model 6200 can also be equipped with a variety
of special purpose oxygen combustion vessels for
unusual samples and/or applications. The 1104 High
Strength Oxygen Combustion Vessel is designed for
testing explosives and other potentially hazardous
materials. The 1109A Semimicro Oxygen Combus-
tion Vessels can be fitted along with its unique
bucket to test samples ranging from 25 to 200 mg.
Removable Bucket
The A391DD removable bucket has been designed
to hold the bomb, stirrer and thermistor with a mini-
mum volume of water and to provide an effective
circulating system which will bring the calorimeter
to rapid thermal equilibrium both before and after
firing.
Dynamic Operation
In its Dynamic Operating Mode, the calorimeter
uses a sophisticated curve matching technique to
compare the temperature rise with a known ther-
mal curve to extrapolate the final temperature rise
without actually waiting for it to develop. Repeated
testing, and over 20 years of routine use in fuel
laboratories, has demonstrated that this technique
can cut the time required for a test by one-half
without significantly affecting the precision of the
calorimeter.