Power Supply Module; Pneumatic System - Teledyne 6400A Instruction Manual

TAI Model 6400A SO
4.2.5.3 Power Switch
The power switch has two functions. The rocker switch controls overall power to the instrument; in
addition it includes a circuit breaker. If attempts to power up the 6400A result in a circuit breaker
trip, the switch automatically returns to the off position, and the instrument will not power up. If this
occurs, consult troubleshooting section or factory.

4.2.6 Power Supply Module

The Power supply module(PSM) supplies AC and DC power to the rest of the instrument. It consists
of a 4 output linear DC power supply and a 15 volt switching supply. In addition, it contains the
switching circuitry to drive the DC operated valves and several switched AC loads to operate the
reaction cell and IZS heaters.

4.2.7 Pneumatic System

In the basic analyzer, the sample enters through a 5-micron TFE filter element. The sample then
enters the KICKER and the reaction cell. The internal (external optional) pump is supplied as
standard equipment with the 6400A.
When the zero/span valve option is included, the sample passes through the TFE zero valve and then
enters the sample filter. (See Section 6) By having the sample gas, zero air and span gas all pass
through the sample filter, the effects of the filter are common to all gases.
Sample flow is controlled by a critical flow orifice. The orifice is a precision-drilled sapphire jewel
protected by a 20-micron sintered filter. The orifice never needs adjustment. The critical flow orifice
maintains precise volumetric flow control as long as the pump inlet pressure is maintained at or near
14"(350mm) Hg absolute.
Note on sample flow reading:
At altitude, the front panel "sample flow" reading will be lower than at sea level. Actually, the volumetric
flow is the same at all altitudes. However, the internal mass flowmeter measures weight flow. Therefore,
as the altitude increases, the indicated flow decreases because of the reduced incoming air density. Flow
variations have a negligible effect on the analyzer reading.
Analyzer Operator Manual, 02164, Rev. G
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