Parr Instrument 6725 - Manual (Page 25)

6725
Semi-micro Calorimeter Instruction Manual
4-5
Figure 2
Cross-Section of the 6725 Semi-micro Calorimeter
Install the thermistor in the cover opening and press the bushing firmly into place to
anchor the probe in its proper position. Place the cover on the calorimeter with the
orienting pin in the alignment hole. Turn the stirrer drive by hand to be sure that it runs
freely, then slip the drive belt first onto the motor pulley and then onto the stirrer pulley.
After the calorimeter is fully assembled with a charged bomb, turn on the motor switch,
and then turn on the stirrer by pressing the stirrer key on the calorimeter operation menu
screen. This will begin gently circulating the water that surrounds the combustion bomb.
Turn on the data logger (accessed via the Diagnostics page) in order to periodically
record the bucket or calorimeter temperature. This begins the calorimetric pre-period.
The bucket temperature is updated every 12 seconds. The pre-period should last for 6-7
minutes. After the 6-7 minute pre-period test phase, activate the calorimeter ignition
circuit by pressing the activate ignition button. This will charge the ignition circuit and
ignite the sample. This begins the calorimetric post-period. The calorimeter temperature