Water equivalent Test by digital microprocessor bomb calorimeter
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benzoic acid weight. 0.95 below
nichrome wire. 7.5cm
cotton thread. 8cm
Distilled water. 2000ml
follow this
Oxygen Bomb
Calorimeter coal test
A known amount of the sample is burnt in a sealed chamber (Bomb). The air is replaced by pure
Oxygen. Sample is ignited electrically. As the sample is burnt, heat is produced. The rise in temperature
is measured. Since barring the loss of heat, the amount of heat produced by burning the sample must
be equal to the amount of heat absorbed by the calorimeter assembly. A knowledge of the water
equivalent of the calorimeter assembly and of the rise in temperature enables one to calculate the
heat of combustion of the sample.
The bomb consists of three parts viz. Bomb body, lid and Union nut.
The Bomb body and the lid are machined from an ultra-strong corrosion resistant stainless steel
alloy containing Cr, Ni & Mo which satisfying special ringing and bending tests for inter-crystalline
corrosion.
The Bomb body is a cylindrical vessel having a capacity of 303 ml. The walls are extremely durable
and can easily withstand the normal operating pressure (30 atmospheres) and also extreme
pressures as high as 300 atmospheres. During burning at high pressures, the Nitrogen & Sulphur
contents are oxidized to their respective acids. The corrosion resistant nature of the Bomb
material protects it from the corrosive vapours.
Each Bomb is tested for its performance as per the requirements of the Institute of Petroleum
(IP12/63T). The test is conducted at a pressure of 300 atmospheres and the pressure is
maintained for a period of 10 minutes without any sign of leakage.
2. Jacket:
Jacket with top cover is provided with special highly insulated material to make temperature
radiation practically nil. With this provision, temperature correction to get the final and correct
results is not required. This provision also eliminates the water pipe and jacket thermometer. This
jacket is essential when the system is supplied with RS232C interface and related software.
3. The Calorimeter Vessel:
The Calorimeter Vessel is the vessel in which the Bomb is placed and is filled with water. It is made
up of Copper and is coated with Ni-Cr to reflect the heat back into the water instead of radiating
it. The Calorimeter Vessel is places inside the Jacket
4. Offset Stirrer:
The Offset Stirrer consists of a stirrer with a fan which is driven at a constant speed of 800 rpm by
a motor which is connected through a heat insulator rubber belt. The motor unit is kept at a
sufficient distance from the vessel to eliminate radiative heating and a heat insulator Bakelite
divides the two parts of the stirrer rod. This arrangement does not raise the temperature of the
water by even 0.01oC in ten minutes, thus easily meeting the specific requirements laid down by
the British Standards Institution and the Institute of Petroleum and accepted by the Indian
Standard Institution. The electric supply for the stirrer motor is obtained through the terminals
provided on the digital firing unit.
5. Pellet Press:
Powdered samples are compressed into pellets before weighing and burning. This retards the
burning rate and tends to retain the particles in the capsule, thereby reducing the chances for
incomplete combustion. The pellets are easier to handle than loose samples. The pellets should
not be made very hard as excessive hardness leads to bursting upon ignition consequent with
incomplete combustion. The Pellet Press has an 8 mm diameter punch and die.
6. Ignition Wire:
Nichrome Ignition wire is supplied with the instrument.
7. Crucible:
Nickel alloy crucibles are offered as standard with the instrument. Quartz, Platinum and Stainless
Steel crucibles are being offered as optiona
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23 дек 2022
