Electronics And Signal Processing - Teledyne 3000PB Operating Instructions Manual

Percent oxygen analyzer

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Table of Contents

Percent Oxygen Analyzer

mizes residual gas pockets that can interfere with very low level oxygen

analysis.

The sample system for the standard instrument incorporates ¼ inch tube

fittings for sample inlet and outlet connections at the rear panel. For metric

system installations, 6 mm adapters are supplied with each instrument. The

sample or calibration gas flow through the system is monitored by a flow-

meter downstream from the cell.

Figure 2-4 is the flow diagram for the sampling system. In the standard

instrument, calibration gases (zero and span) can be connected directly to the

Sample In port by teeing to the port with appropriate valves. The shaded

portion of the diagram shows the components added when the –C option is

ordered. The valves, when supplied, are installed inside the NEMA enclo-

sure and are regulated by the instrument's internal electronics.

Span In

Zero In

Sample In

In vacuum service the

restrictor should be

placed here.

Exhaust Out

Restrictor

2.4

The signal processing and display electronics PCBs are mounted on the

back of the inner door. See Major Internal Components in chapter 5, for

illustration. The power supply module is mounted underneath the bottom end

of the Electrical Connector Panel.

The Model 3000PB Percent Oxygen Analyzer uses an 8031 microcon-

troller with 32 kB of RAM and 128 kB of ROM to control all signal pro-

cessing, input/output, and display functions for the analyzer. System power

is supplied from a universal power supply module designed to be compatible

with most international power sources. CE approved units for the European

market also contain an EMI filter. Figure 2-5 is a simplified block diagram of

the Analyzer electronics.

Solenoid

V alves

In norm al service the

restrictor should be

placed here.

Figure 2-4: Flow Diagram