Extrel MAX300-RTG - Changing the Inlet

MAX300-RTG : Hardware Manual Hardware Maintenance
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sample containment assembly, which is a component of the safety system of the
unit. It must not be damaged or modified in any way. When accessing pumps,
vacuum system, or electronics for system maintenance, ensure that this tubing is
not kinked or damaged, as this can affect safety of the system. Please contact
Extrel service with any questions.
In the most common configuration, the sample selection valve, the heated transfer
line, and the inlet assembly deliver the sample stream to the instrument for
analysis. The sample selection valve is used to select the sample stream to be
analyzed while the transfer line connects the output of the desired stream to the
pressure reduction system and the inlet assembly. The tee of the inlet is used to
remove excess sample and decrease inlet clearing time. A small portion of the
sample stream flows through the heated transfer line, into the inlet, and is admitted
into the mass spectrometer. A flow switch (50 cc/min) is used to monitor for loss
of sample flow at all times.
The transfer line, tee and inlet assembly can be heated to prevent condensation
of stream components as the sample is transported into the mass spectrometer.
The transfer line can heat the tubing from room temperature to 300
○
C. A heater
located around the inlet heats the assembly. Alternative sample path components
may be present, depending on the application and sample configuration.
The inlet requires no regular maintenance. The size of the fused silica inlet
restrictor is dependent on the application. Particulates in the sample stream may
clog the assembly and force it to be changed.
Changing the Inlet
Required Tools
 3/4 inch Open End Wrench
 5/8 inch Open End Wrench
 9/16 inch Open End Wrench
 3/16 inch Open End Wrench
 9/64 inch Hex Key
 Ohm Meter
Warning – This inlet forms a “containment system” that allows sample gas
to be safely introduced into the mass spectrometer. Replacement of the inlet
must be done using new Extrel approved components while carefully