Parr Instrument 1104 - Manual (Page 4)

1104 Oxygen Combustion Vessel
P a r r I n s t r u m e n t C o m p a n y 4
Bomb Head Assembly
Sample Preparation (continued)
It is not advisable to test true explosives in the
presence of oxygen. Some of the end products of
the explosion will be combustible in high-pressure
oxygen, for example, mixed oxides of nitrogen and
carbon monoxide. With high-pressure oxygen avail-
able, these will burn to carbon dioxide and release
an undeterminable amount of heat that did not
come from the initial reaction of interest. This sec-
ondary combustion might give off nearly as much
energy as the preliminary explosion. To eliminate
this concern, it is recommended that the user fill the
bomb with nitrogen and then release the valve to
flush the vessel, repeating this process twice. This
will reduce the atmospheric oxygen trapped in the
bomb to a level that is insignificant, relative to the
primary reaction. It is advisable to leave a residual
pressure of at least 5 atmospheres on the bomb in
order to seal the inlet check valve.
Operation
Setting the Calorimeter Parameters
When using the 1104 Oxygen Combustion Vessel in
a calorimeter, the user must ensure that the correct
User ID is set in order to obtain the appropriate op-
erating parameters. For the 6200 Isoperibol Calo-
rimeter, the User ID must be “62-1104”. For the 6100
Compensated Jacket Calorimeter, the User ID must
be “61-1104”.
1. From the Main Menu in the 6000 Series calorim-
eter, select “Program Info & Control”
2. From Program Info & Control, select “User Setup
ID”
3. Press “Clear”
4. Enter “62-1104” (or “61-1104”)
5. Press “Enter”
6. Press “Reload User Default Settings” and follow
the instrument prompts
For older models, please contact Parr for the appro-
priate software.