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CGA 351 User’s Manual 1
Chapter 1.
Chapter 1.
1.1 General Information
1.1.1 Introduction
The CGA 351 monitors the oxygen content of any clean and dry gas stream. The analyzer can accurately measure
oxygen levels from 0.1 ppm to 100% O
2
, and can even measure oxygen content in reducing gases. This is
accomplished with a precision, temperature-controlled, zirconium oxide (zirconia) oxygen sensor.
The standard CGA 351 analyzer is supplied in a pair of stainless steel, NEMA 4X/IP66 enclosures mounted side-by-side
on a metal plate with a 40” flexible conduit connecting the two. This compact, wall-mounted system includes the
following components:
•
a
sensor enclosure, which contains the oxygen sensor, sensor furnace, thermocouple, inlet port with needle valve,
outlet port with flowmeter, and interconnecting cable(s), and
• an electronics enclosure, which contains the temperature control circuitry, output signal processing circuitry,
digital display, user interface, and wiring terminal strips.
The CGA 351 analyzer is also available in optional enclosures. See Appendix C for more information.
Figure 1: Standard CGA 351 Analyzer
1.1.2 The Sensor Enclosure
The sensor enclosure, which is shown in Figure 2 below, houses the sample measurement components. The functions
of these components are as follows:
•
a zirconium oxide (zirconia)
oxygen sensor converts the oxygen concentration of the sample gas into a mV
output signal.
• a sensor furnace heats the oxygen sensor and the sample gas to the optimum temperature of 700°C.