Teledyne 3010TB - Split architecture trace oxygen analyzer - Manual (Page 68)

2-6: Part II
2 Operational Theory Model 3010T
Teledyne Analytical Instruments
2.3 Sample System
The sample system delivers gases to the Micro-Fuel Cell sensor from
the Analysis Unit Gas Control Panel inlets. Depending on the mode of
operation either sample or calibration gas is delivered.
Figure 2-4 is a typical flow diagram for the sampling system. The flame
arrestors and valves (shaded) are optional.
When the –C option is ordered, the valves are installed inside the 3010
enclosure and are regulated by the remote Control Unit electronics.
Figure 2-4: Flow Diagram
The Model 3010T sample system is designed and built to ensure that
the oxygen concentration of the gas is not altered as it travels through the
sample system. The sample encounters almost no dead space. This mini-
mizes residual gas pockets that can interfere with trace analysis.
The metal restrictor upstream from the cell helps manage the flow
through the system (1 SLPM at 20 psig for nitrogen). It is corrosion and
blockage resistant.
The sample or calibration gas flowing through the system is monitored
by a flowmeter downstream from the cell. The sample system for the stan-
dard instruments incorporates
1/4 inch tube fittings for sample inlet and outlet
connections on the Gas Control Panel. For metric system installations, 6 mm
adapters are supplied.
For -Vacuum Service, the restrictor is located downstream of the
flowmeter. The restrictor is installed in the exhaust port on the gas panel.
In vacuum service the
restrictor should be
placed here.
Sample In
Span In
Zero In
Flowmeter
Exhaust Out
Solenoid
Valves
Restrictor
Cell
In normal service the
restrictor should be
placed here.
Components in the shaded area are in
the -C option (internal control valves)
only and are not shown in the piping
diagram above.