Parr Instrument 6300 - Manual (Page 27)

O
PERATING
I
NSTRUCTIONS
6300
5
w w w . p a r r i n s t . c o m 27
C
HAPTER
5
O
PERATING
I
NSTRUCTIONS
T
O
B
EGIN A
T
EST
Weigh the sample to 0.1 mg. 1.
Gently tap the capsules that contain powdered 2.
samples to compact the material. (Pellets are easier
to handle than loose samples and they burn slower
in the bomb, thereby reducing the chances for in-
complete combustion.)
Carefully place the capsule into the capsule holder.
3.
Attach 10 cm of ignition thread (see Figure 5-2). 4.
Install bomb head in calorimeter. 5.
Close calorimeter cover making certain the latch is 6.
engaged
Select determination or standardization as appro-
7.
priate on Calorimeter Operations Page, Operating
Mode.
Press START to begin the test. Calorimeter will
8.
prompt operator for Cal ID number, Sample ID
numbers and weights in accordance with operating
modes set into the instrument.
O
PERATING THE
O
XYGEN
B
OMB
Combustion with oxygen in a sealed bomb is a very
effective and reliable method for releasing all heat
energy obtainable from a sample, and for preparing
hydrocarbon compounds and carbonaceous materials
for analysis.
Note:
The following precautions must always be observed when
using this equipment:
Do not overcharge the bomb with sample or with a 1.
sample which might react with explosive violence.
Do not overcharge the bomb with oxygen. The
2.
initial charging pressure should not exceed 40 atm
(600 psig).
Do not fire the bomb if there is any indication that
3.
it is leaking.
Stand away from the calorimeter during firing and
4.
for at least 20 seconds after firing.
Keep the bomb in good condition at all times. Any
5.
parts that show signs of weakness or deterioration
must be replaced promptly.
Read the maintenance and safety instructions before
6.
starting to use the bomb, and urge all operating
personnel to read these instructions often.
Note:
Tape should always be stored in a sealed container to
minimize changes in its moisture and solvent content.