Trace Oxygen Monitoring in UHP Semiconductor Process Gases

Required oxygen sensitivity depends on the process gas, semiconductor application, and allowable contamination limits. Many UHP applications require sub-ppm oxygen measurement, while more demanding processes may specify concentrations in the low-ppb range. The OMD-675 provides high-sensitivity trace oxygen monitoring for applications requiring ppb-level detection. The appropriate measurement range should be selected based on the facility’s gas purity specifications and process requirements.

The OMD-675 is a rack-mounted, extractive oxygen analyzer that measures a gas sample drawn from the distribution line rather than being installed directly inline. A properly designed sample system can connect the analyzer to bulk gas distribution piping, allowing continuous trace oxygen monitoring. Sample pressure, flow, materials, and connection methods must be appropriate for the gas being measured to ensure accurate results and minimize contamination.

Trace oxygen contamination can affect semiconductor manufacturing by causing unwanted oxidation of sensitive wafer surfaces, interfering with thin-film deposition, or altering certain etching processes. Depending on the process, even low concentrations of oxygen may contribute to defects, inconsistent film properties, and reduced wafer yields. Continuous trace oxygen monitoring with the OMD-675 helps engineers detect contamination and maintain oxygen concentrations within specified process limits.