Teledyne 4060 manual Fuel and Blanket Air Systems, Flame Ionization Detection Cell

Operational Theory Series 4060

supplied at constant pressures using two stage stainless steel diaphragm gas regulators. The recommended pressure range is 30 to 80 psig, however, the span gas should be supplied at a pressure of 20 psig to the restrictor fitting either on the optional autocal module or the span inlet on the rear panel.

The Piping Diagram for the standard instrument is shown in Figure 2-2. A 10-port 2-position GC sampling valve is used to control and direct gas flows including sampling, back flush, and carrier gas. The fixed volume sample loop ensures the same volume of sample injection in the column every cycle.

If your instrument is fitted with the optional auto calibration module, a separate compartment containing of a pair of solenoid valves is installed for controlling the introduction of sample or span gas to the detector. Calibration can be performed automatically on a programmed schedule or manually using the front panel interface.

2.3.3 Fuel and Blanket Air Systems

Stable flow is achieved by maintaining a constant pressure across restrictors upstream from the cell. Each system incorporates an adjustable pressure regulator, pressure gauge, and restrictor. A flame out light is included to indicate when the flame fails. A fuel shut-off solenoid valve, mounted on the line that supplies fuel, stops the fuel flow in case of flame failure. This valve is located in line with the fuel port.

2.3.4 Flame Ionization Detection Cell

The carrier gas containing sample and fuel are combined within a tee fitting located in the isothermal chamber. The mixed gas is emitted from a burner within the sensor assembly. Blanket air is introduced into the sensor (or cell) by means of a separate fitting that is located in the base section of the assembly. The upper half of the assembly houses the anode-igniter, collector, and flame guard thermistor.

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