Parr Instrument 6200 - Manual (Page 12)

2
Installation
P a r r I n s t r u m e n t C o m p a n y 10
All connections should be checked for leaks. Any
leaks detected must be corrected before proceeding.
Instructions for operating the filling connection are in
the
Operating Instructions chapter.
Adjust the pressure regulator to deliver 450 psi of O2.
Assemble the oxygen bomb without a charge and
attach the filling hose to the bomb inlet valve. Press
the O2 Fill key on the Calorimeter Operation page and
observe the delivery pressure on the 0 – 600 psi gage
while the oxygen is flowing into the bomb. Adjust the
regulator, if needed, to bring the pressure to 450 psi.
If there is any doubt about the setting, release the gas
from the bomb and run a second check.
Printer and Balance Connections
Connect the printer to the calorimeter at this time.
The Parr 1758 Printer is configured and furnished with
a cord to connect directly to the USB port on the back
of the calorimeter.
If a balance is to be attached to the calorimeter it
will be necessary to use a USB hub so that multiple
devices can be connected. Any standard USB hub can
be used.
Standardizing the Calorimeter
The calorimeter must be accurately standardized prior
to actually performing calorimetric tests on sample
materials. Review
Appendix C - Standardization , in
order to become familiar with the general procedure
and calculations. The user should configure the
calorimeter at this time to accommodate the desired
sample weight entry mode. The calorimeter can be
placed into standardization mode on the Calorimeter
Operation Page, with the OPERATING MODE key.
If two bombs and buckets are being used with the
calorimeter to maximize sample throughput, the
calorimeter can be configured to prompt for a Bomb
ID at the start of each test. The Bomb ID can also be
selected on the Calorimeter Operations Page, using
the Bomb/EE key. All bomb and bucket combinations
will need to be standardized separately. The end result
of a standardization test is an energy equivalent
value, or the amount of energy required to raise the
temperature of the calorimeter one degree. Repeated
standardization with any given bomb and bucket
combination should yield an energy equivalent value
with a range of 14 calories per degree, centered
around the mean value for all tests using that bomb
and bucket combination. The calorimeter is ready for
testing samples after an energy equivalent value has
been obtained.
Tap Water Cooling
Connect the tap water supply to the cold water inlet
on the back of the calorimeter using either 1/4”
copper or nylon tubing (HJ0025TB035). A 196VB
metering valve is provided with the calorimeter.
This valve should be installed in this inlet line near
the calorimeter. This valve is used to adjust the flow
of water to the heat exchanger to compensate for
differences in tap water temperatures and water line
pressures. Once the calorimeter is operating at equi-
librium, check the jacket temperature that is displayed
on the operating page. If this temperature is cycling
significantly, close down on the metering valve to
reduce the flow of cooling water. If the jacket rises
above its 30 °C set point, open this valve to increase
the cooling. A flow rate of 100 ml/ minute is generally
all that is required.
Connect the cooling water outlet on the back
of the calorimeter to a drain using either nylon
(HJ0025TB035) or copper 1/4” tubing. A shut off
valve in tap water supply line is also a good idea
if the calorimeter will not be used for an extended
period.
Cooling with the Water Handling System
If the calorimeter is to be operated with a Parr Water
Handling System, connect the pump output to the
cooling water inlet and connect the cooling water
outlet to the return connection on the water handling
system. With this installation it is neither necessary
nor desirable to install the 196VB metering valve in
the inlet line. It is a good idea to keep all water line
runs as short as practical to avoid unwanted tempera-
ture changes in the water between the source and the
calorimeter.
Oxygen Filling Connection
The 6200 Calorimeter is equipped with an automatic
bomb oxygen filling system. This system consists of
an oxygen pressure regulator with a relief valve that
mounts on an oxygen tank and a controlled solenoid
inside the calorimeter. To install the regulator on the
oxygen supply tank, unscrew the protecting cap from
the oxygen tank and inspect the threads on the tank
outlet to be sure they are clean and in good condi-
tion. Place the ball end of the regulator in the outlet
and draw up the union nut tightly, keeping the gages
tilted slightly back from an upright position. Connect
the regulator to the oxygen inlet fitting on the back of
the calorimeter case. This hose should be routed so
that it will not kink or come in contact with any hot
surface. Connect the high-pressure nylon hose with
the push on connector to the oxygen outlet fitting on
the back of the calorimeter.