Parr-instrument 1104 Manuel d'utilisateur télécharger pdf (Page 7)

1104 Oxygen Combustion Vessel

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threaded on instead of pushed on to the inlet valve.

The correct assembly to use when lling the 1104

from a calorimeter is P/N A19A15. Close the outlet

valve on the bomb head. Thread the end of the ll

connection on to the inlet valve of the 1104. Press

“O2 Fill” on the calorimeter to ll the vessel.

Filling the Bomb Manually

To ll the vessel directly the 1823 Oxygen Fill Con-

nection must be used. Close the outlet valve on the

bomb head. Open the oxygen tank valve not more

than a quarter turn. Open the control valve on the

ll connection slowly and watch the bomb pres-

sure rise to the desired lling pressure. Close the

control valve on the ll connection. The inlet check

valve will close automatically when the residual

pressure in the lling hose is released; leaving the

bomb lled to the highest pressure indicated on

the gage. Release the residual pressure in the ll-

ing hose by pushing downward on the toggle relief

lever attached to the ll connection. The gage should

now drop to zero. If the pressure drops slowly and

a large amount of gas escapes when the pressure

relief valve is opened, the check valve in the bomb

head is not operating properly. This trouble will have

to be corrected before the bomb can be used.

If too much oxygen should accidentally be intro-

duced into the bomb, do not proceed with the

combustion. Detach the lling connection, exhaust

the bomb, remove the head and reweigh the sample

before repeating the lling operation.

When using the bomb in a calorimeter, insert the

lifting handle into the two holes in the side of the

screw cap and lower the bomb partially into the

calorimeter water bucket. Note that the bucket

should be lled with 1850 mL of water. Press the

banana plugs on the two ignition wires rmly into

the terminal sockets on the bomb head before the

head is immersed in the water. After connecting the

wires lower the bomb into the bucket. Remove the

lifting handle and shake off any drops of water back

into the bucket. The calorimeter should be standard-

ized using an amount of Benzoic Acid that releases

approximately the same amount of energy as the

sample to be tested. An approximate EE value for

the 1104 in the 6000 Series instruments is 2500

cal/°C.

When using the bomb alone, it must be connected

to an ignition unit (P/N 2901). Always place the 1104

Oxygen Combustion Vessel behind a heavy shield

or barricade and completely submerge the bomb in

cold running water while ring. If the sample devel-

ops an unusually large amount of heat, it is recom-

mended that a cold stream of water be run against

the bomb to facilitate cooling.

Note: Do not ﬁre the bomb at any point if there

is gas leakage.

The bomb must remain in the water bath until all

parts of the head and screw cap come to tempera-

ture equilibrium. Then remove the bomb from the

bath, wipe it with a clean towel and release the

residual gases through the needle valve before

unscrewing the compression screws and removing

the cap. If necessary, a spanner wrench (P/N 219A) is

provided to remove the screw cap of the vessel.

Maintenance

The chromium plated, steel alloy screw cap on the

bomb requires special care to keep the threads

from rusting and to prevent seizure. Always dry the

cap thoroughly after it has been used and store the

bomb with the screw cap removed from the cylin-

der. Keep a light coating of anti-seize lubricant (P/N

424HC2) on the threads of the cap but do not use

this or any lubricant on any other parts of the bomb.

Basic maintenance of the bomb including replacing

the O-ring, insulators, gaskets and spacers is recom-

mended every 500 rings. If the bomb is used for

samples that contain a high amount of corrosive

materials, this maintenance should be completed

after every 250 rings.

Parr provides Oxygen Bomb repair services for the

1104 (P/N REPAIR.O7). A factory test is recommend-

ed after 5000 rings. This includes replacing all of

the seals, checking the dimensions of the cylinder,

screw cap and head, hydrostatically testing the seals

and proof ring the vessel using benzoic acid.

When returning a bomb to the factory, ship it to:

Parr Instrument Company

Attn: Repair Department

211 53rd Street

Moline, IL 61265-1720

Include a Purchase Order to cover the cost of the

repair, a person to contact (complete with a phone

number) and return shipping information. Individual

repair parts can be ordered from any Parr dealer or

directly from Parr.

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Parr-instrument 1104 Manuel d'utilisateur Page 7

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