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THEORY OF OPERATION M300EU

Addendum to M300E/EM Manual P/N 04288

The auto-reference measurement takes approximately 15 minutes. To ensure that the sample chamber of the

optical bench is properly purged when switching between the sample and auto-reference measurements and

vice-versa, each auto-reference cycle includes a 3 minute dwell period before and after the actual

measurements are made. This cycle is restarted every 4 hours by an ACAL sequence, programmed at the

factory (see Section 6.4).

Figure 10-2: Auto-Reference Measurement Cycle

10.2. PNEUMATIC OPERATION

With the exceptions to the difference discussed on other portions of this addendum regarding the A-REF CO

scrubber and the Nafion

dryer, (See Sections 3.2, 5.1.1, 5.1.2, 5.1.3, 10.1.1 & 0) the pneumatic operation is the

same as that described in Section 10.3 of the M300E/EM Operators Manual (P/N 04288).

10.2.1. THE A-REF CARBON MONOXIDE SCRUBBER

A special CO scrubber is used to remove all of the CO from the gas stream when the instrument is performing

an auto-reference measurement. The scrubber contains a substance that catalyses a chemical reaction

converting any CO in the gas stream to CO

NOTE

To operate properly, the gas flowing though the scrubber must contain at least 5% O

This includes calibration gases such as zero air and span gas.

The O

scrubber is located inside the auto-reference valve assembly.

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Teledyne 300EU Manual de usuario Pagina 58