Servomex has announced that it now offers SIL 2 safety compliance for the 2222H transmitter unit of its SERVOTOUGH OxyExact 2200 oxygen gas analyser.

A high-precision oxygen analyser designed use in for hazardous area installations, the OxyExact utilises Servomex’s patent field-proven, non-depleting Paramagnetic sensing technology for a highly accurate, repeatable oxygen measurement.

Using an intelligent three-enclosure system to ensure safe operation, it measures enriched oxygen (up to 100% O2) in potentially flammable sample gases at pressures up to 45psia.

This system dramatically reduces ongoing costs by removing the need for pre-sample drying.


Used in process control applications where high-temperature, high-performance oxygen measurements are required, the OxyExact is ideal for use in a range of hydrocarbon processing applications including production of ethylene oxide, propylene oxide, ethylene dichloride, and vinyl acetate monomer acid.

The 2222H is now assessed as being SIL 2 compliant for use in safety instrumented systems in respect of hardware integrity only, according to IEC 61508 part 2:2010. This means the OxyExact is certified for safe use in an even wider range of hazardous environments. The assessment covers 2222H units configured with or without the optional internal flow alarm feature.

Servomex, an acknowledged innovator in gas analysis technologies for more than 60 years, said the compliance was significant because the safety integrity level system is ‘a cornerstone of risk reduction’.

Keith Warren, Product Manager for process oxygen paramagnetic and zirconia products at Servomex, told gasworld, “Safety is critical to many gas analysis processes, and nowhere more so than in the complex process oxygen conditions the OxyExact is optimised for.”

“The Safety integrity level system is a cornerstone of risk reduction, so for the 2222H transmitter to achieve SIL 2 hardware compliance further underlines the safe, reliable nature of the OxyExact system, and extends its suitability for installation on a wide range of petrochemical and gas processing installations.”

2222H SIL 2 rating adds to the existing range of hazardous areas certifications covering the OxyExact, including ATEX, IECEx, FM and CSA compliance, and joins the OxyExact 2223 transmitter versions in being SIL 2 compliant.