Amerex 14795 - Manual (Page 4)

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B. Halotron I Filling (Liquid Transfer) Principals
Once the extinguisher has been vacuumed, it is ready to be filled with Halotron I (sometimes
referred to as Halotron I Presat Base). The filling lines and quick connect used in the filling
process should be compatible with Halotron I. Elastomers should be Chloroprene based on
EPDM rubber.
One of the key differences between Halon 1211 and Halotron I is that the Halotron I bulk
supply cylinder must be kept under pressure during the transfer of liquid from the bulk
supply cylinder to an extinguisher. Halotron I is a blend of two gases forced into a base of
HCFC-123 by pressure. To insure that the uniformity of the Halotron I blend stays
consistent during transfer, a supply of argon must be connected to the Halotron I bulk supply
cylinder to maintain a minimum pressure of 95 psig (655 kPa). This is easily accomplished
with a high pressure argon cylinder and a regulator.
No pumps are necessary to transfer the Halotron I liquid into the extinguishers. The transfer
can be completed by connecting the filling hose to the extinguisher and opening the
extinguisher valve. Once the extinguisher valve is opened, the pressure difference will allow
the Halotron I to fill the extinguisher. Once the desired Halotron I weight is reached, the
extinguisher valve can be closed.
C. Final Pressurization Principals
The pressurizing gas for Halotron I is argon and should conform to the specification in Fig.
A. Argon is somewhat soluble in Halotron I. When an extinguisher is discharged, the argon
in solution is released into the extinguisher vapor space, helping to maintain the pressure.
Since nitrogen is considerably less soluble in Halotron I, it should NEVER be used to
pressure Halotron I. Pressurization with nitrogen could cause a decrease in the
performance of the extinguisher.
The final pressurization of an extinguisher is
accomplished by:
1. Pressurizing the extinguisher with argon to the
desired pressure.
2. Agitating the extinguisher until the pressure
equalizes
3. Repeating Steps 1 and 2 until pressure stabilizes
at the correct operating pressure.
The agitation of the extinguisher aids in the absorption of argon into the Halotron I liquid. The
agitation does not have to be vigorous but can be accomplished by a gentle rocking of the
extinguisher for 5 to 10 seconds. It is not uncommon for the extinguisher to drop more than 20
or 30 psig (38 kPa to 207 kPa) the first time it is agitated
.
ARGON SPECIFICATIONS
Property Minimum Maximum
Assay 99.998% - - -
Oxygen 4.0 ppm
Total
Hydrocarbons - - - 0.5 ppm
Water - - - 4 ppm
Dew Point - - - -90°F (-68°C)
Fig. A