CONCOA ADI 2062M Instrucciones Para La Instalación Y Operación página 9

the line through your usage points. Both regulator gauges should
descend to zero.
4. With HAZARDOUS GASES run an inert purging gas through the
regulator and system before disassembly.
5. After venting (and purging when applicable), turn the adjusting knob
fully counterclockwise and close the outlet valve.
6. Disconnect downstream equipment.
7. In disassembling, slowly loosen the cylinder valve connection,
while listening for gas seepage. If leaking is evident, retighten the
connection, and check for effective closing of the cylinder valve.
8. Cap the cylinder after disconnecting the regulator. Mark the cylinder
"EMPTY" if this is the case, and move it to the storage area for return
cylinders.
9. If HAZARDOUS GASES have been used, and there has not been a
purging procedure as recommended, some benefit can be gained by
directing a stream of dry nitrogen through the fully opened regulator.
When using HAZARDOUS GASES or when in a CONFINED AREA,
be sure to provide a safe discharge area when clearing the regulator.
10. Install a new cylinder, if called for.
11. When a regulator is out of service, close the pressure control knob
by turning counterclockwise until the spring tension relieves, and
close the outlet valve. Also cap open ends of the regulator, or if
removed, store it in a plastic bag to prevent contamination, especially
by unobserved particulate buildup inside the regulator.
b. ISOLATED GAS SYSTEMS: Some practices (especially on high purity
systems), demand that ambient air be excluded from the system. There
are several methods in use:
1. Seal the usage gas in the system.*
2. Exert a vacuum on the system after shutdown.
3. Replace the system gas with an inert gas.
*This method should not be used with hazardous gases for more than a brief time.
3.3 CYLINDER CHANGE - ISOLATED GAS SYSTEMS. For cylinder change
on ISOLATED GAS SYSTEMS, a valve upstream of the regulator is
required, and is provided when an upstream purge devices such as the
CONCOA Deep Purge is used.
a. Tightly close the gas cylinder valve.
b. Close the valve upstream of the regulator (the center or master
valve on the Deep Purge).
c. With hazardous gases, purge the cylinder valve cavity using
procedures contained in the specific instruction manual for your
purge assembly.
d. Follow steps 3.2a 7, 8, and 9.
e. Method 3.2b 2, maintaining a vacuum after shutdown, requires that
the system be well sealed, as any leaks will pull impurities into the
system.
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