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Model 400A
LEAK CHECK
2-6
Do not perform this operation with the fuel, air and sample lines connected to the analyzer.
5. Recommended method is to attach the tubing to either a nitrogen or
helium cylinder through a two-stage regulator and adjust the regulator
for a low flow of gas through the tubing. Use a propane or natural gas
torch to heat the tubing to at least 300°C, working the heat source
slowly from the regulator end to the open end. This will remove
contaminants from the inside walls of the tubing, and drive them out the
open end.
6. Connect external fuel and air lines to fuel and air inlet fittings on
analyzer. Connect external sample line to sample inlet on analyzer (or to
inlet fitting on sample pump, if used).
7. Adjust regulators on fuel and air cylinders (or other gas supply sources)
for appropriate output pressure. maximum permissible pressure at air
and fuel inlets of analyzer is 50 psig (345 kPa). The pressure at the air
inlet must be at least 5 psig (34 kpa) higher than the desired setting on
the air pressure gauge within the analyzer. Thus if the internal fuel
pressure regulators are to be set at a typical value of 25 psig (172 kPa),
the pressure at the fuel inlet must be set 15 to 20 psi (103,4 to 137,9
kPa) higher than the operating pressure.
8. Supply sample gas at appropriate pressure, as explained in "Sample
Handling". Sample bypass flow must be between 0.5 and 3.0
liters/minute for proper operation. Preferably, it should be between 2.0
and 3.0 liters/minute, to minimize system response time. Flow may be
measured by connecting a flowmeter to bypass outlet.
Be particularly careful in checking for leaks in the fuel lines. Fuel gas leakage can cause an
explosion.
Check all gas connections to ensure that they are leak free. Use of SNOOP
(P/N 837801) or other suitable leak-test liquid is recommended. Do not use
soap or other organic substances; they will contaminate the system resulting
in excessive noise and background current. To leak check the fuel
containment system, it is necessary to have full operating pressure within the
system. To accomplish this, hold the momentary IGNITE/PURGE switch in
the up or PURGE position.
Instruction Manual
IM-103-400A, Rev. 1.0
December 2008
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