Parr Instrument 6200 User Manual

Page 28

6200

Calorimeter Operating Instruction Manual

Set the bucket in the
calorimeter. Attach the lifting
handle (421A) to the two
holes in the side of the

screw cap and partially lower the
bomb in the water. Handle the
bomb carefully during this operation
so that the sample will not be
disturbed. Push the two ignition lead
wires into the terminal sockets on
the bomb head. Orient the wires
away from the stirrer shaft so they
do not become tangled in the stirring
mechanism. Lower the bomb
completely into water with its feet
spanning the circular boss in the
bottom of the bucket. Remove the
lifting handle and shake any drops of
water back into the bucket and
check for gas bubbles.

Close the calorimeter cover. This
lowers the stirrer and thermistor
probe into the bucket.

Select determination or
standardization as appropriate on
the Calorimeter Operation menu by
toggling the operating mode key.
After pressing the start key, the
calorimeter will now prompt the
operator for Bomb ID number,
sample ID number, sample weight
and spike weight in accordance with
the instructions set into the operating
controls page.

The calorimeter will now take over
and conduct the test. During the
time it is establishing the initial
equilibrium, it will display
PREPERIOD on the status bar. Just
before it fires the bomb, it will sound

a series of short beeps to warn the
user to move away from the
calorimeter. Once the bomb has
been fired, the status bar will display
POSTPERIOD. The calorimeter will
check to make certain that a
temperature rise occurs and will then
look for the final equilibrium
conditions to be met. If it fails to
meet either the initial or final
equilibrium conditions, or if it fails to
detect a temperature rise within the
allotted time, the calorimeter will
terminate the test and advise the
user of the error.

8. At the conclusion of the test, the

calorimeter will signal the user.

9. Open the cover and remove the

bomb and bucket. Remove the
bomb from the bucket and open the
knurled valve knob on the bomb
head to release the residual gas
pressure before attempting to
remove the cap. This release
should proceed slowly over a period
of not less than one minute to avoid
entrainment losses. After all
pressure has been released,
unscrew the cap; lift the head out of
the cylinder and examine the interior
of the bomb for soot or other
evidence of incomplete combustion.
If such evidence is found, the test
will have to be discarded.
Otherwise, wash all interior surfaces
of the bomb, including the head, with
a jet of distilled water and collect the
washings in a beaker.

Operating the
Calorimeter
Continued

5-3