Teledyne Analytical Instruments 3020 M, Operating Instructions Manual

Page: 40 / 107

Paramagnetic Oxygen Analyzer Operational Theory
Teledyne Analytical Instruments
17
The sample or calibration gas flowing through the system is moni-
tored by a flowmeter downstream from the sensor.
The gases delivered to the instrument should be at constant
pressures and flow rates and must exit freely into the ambient
atmosphere. The Span, Zero and Sample gases should be delivered at
constant pressures of about 10 psig (Range 5-25 psig). The flow rate
must be maintained at about 300 cc/minute (Range 50-600cc/m) and
must exit freely into atmospheric pressure.
Figure 2-3 is the flow diagram for the sampling system. In the
standard instrument (shown on the right), calibration gases (zero and
span) can be connected directly to the Sample In port by teeing to the
port with appropriate valves. The shaded portions of the diagram show
the components added when the —C and/or —F options are ordered.
The solenoid valves, when supplied, are installed inside the 3020M
enclosure and are regulated by the instruments internal electronics. The
flame arrestors, when supplied, are installed in the Gas Connector
Panel..
Figure 2-3: Flow Diagram