Specifications

748420-A

August 1999

Trace Oxygen Analyzer Module

Rosemount Analytical NGA 2000

NSTALLATION

Note

Do not add water. The volume and concentration of the bottled electrolyte is pre-

measured.

Reinstall the black Sensor cover and carefully reinstall the Sensor Assembly inside the

Analyzer Module. Do not the tilt the Sensor Assembly excessively as electrolyte may leak

out.

2.3 L

OCATION

(See Figure 2.2) The TO2 Analyzer Module comes standard with mounting ears for easy

installation on flat, horizontal surfaces. Install the TO2 Analyzer Module in a clean, weather-

proofed, vibration-free location free from extreme temperature variations and moisture. For

best results, install the instrument near the sample stream to minimize sample transport

time.

Operating ambient temperature is 0

C to 45

C (32

F to 81

F). Temperature change

should not exceed 10

C (18

F) per hour. The same temperature restrictions apply to the

location of the zero and span gas cylinders.

2.4 G

ASES

2.4.1 R

EQUIREMENTS

The TO2 Analyzer Module requires only a standard of accurately known composition for use

as a span gas. The span gas should be supplied from a cylinder equipped with a clean,

metallic diaphragm, two-stage regulator. A shutoff valve is recommended.

Calibration Gases

The TO2 module does not require routine zero calibration. The zero is factory set and does

not experience routine drift. Over long periods of time, the zero may experience minor drift.

For low ppm range analyzers, you may wish to check the zero at one year intervals.

Oxygen-free nitrogen is recommended for use as zero gas. This gas is certified to <0.5

ppm oxygen and can be improved by passing the zero gas through an oxygen scrubber

such as Millipore™ Waferpure or Semigas Nanochem® resin purifiers. A mixture of trace

oxygen in a background of nitrogen is recommended as span gas. For maximum accuracy,

the concentration of trace oxygen in the span gas should be as high as possible for the

range of measurement.