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Introduction 1Introduction 1

Introduction 1

Teledyne Analytical Instruments

IntroductionIntroduction

Introduction

The Teledyne Analytical Instruments Model 356WA Trace Oxygen

Analyzer is designed to detect oxygen concentrations in process streams. It

utilizes Teledyne’s patented electrochemical sensor which requires minimal

maintenance and exhibits a 90% response in less than one minute. Cell

output is insensitive to flow rate changes within the operating range of the

analyzer’s flowmeter.

The Model 356WA features a welded stainless sampling system for

long-term, leak-free operation.

While the analyzer is offered in several configurations, they are virtually

identical with the exception of housing or options such as special meters. For

purposes of clarity, this manual will discuss the unit in general. The differ-

ences between the configurations are minor and will be obvious to the user.

1.11.1

1.1 Method of OperationMethod of Operation

Method of OperationMethod of Operation

Method of Operation

Gas from the process stream is fed through a sample line to the sample

inlet port of the analyzer. The sample is directed through the analyzer’s

sample system, where oxygen concentration is detected by the sensor. The

sensor generates an output signal which is read out on a suitable recorder or

meter.

The analyzer components include:

• A throttle valve and flowmeter to control sample flow

• A humidifier to condition the sample

• The measuring cell where catalytic conversion occurs

• An electronic amplifier circuit for converting the output of the

cell to a DC signal.

• A thermostatic assembly for temperature control in the cell

compartment

• A reservoir for providing make-up water to the humidifier.