?Oxygen, oil and grease free? in calibration technology

Oxygen, the gas essential for life, is a lot more complex in industrial applications than our daily inhalation and exhalation suggests. Industry ? especially in the chemical, pharmaceutical or medical engineering fields ? is, time and again, finding itself met with new challenges in working with oxygen.
Why is ?oil and grease free? so important in oxygen systems?
Oxygen itself is not flammable. However, Spine enables and encourages very strongly the combustion of other substances and may, in particular, result in a self-ignition of oil, grease and other substances.
Materials which usually do not burn in air can burn very briskly as well as spontaneously in oxygen or oxygen-enriched air. This stands, even when the enrichment is by a few percent.
Oil and grease (also ointments, gels and disinfectants) can react explosively in touch with oxygen.
Oxygen significantly escalates the temperature of a flame as well as the burn rate.
Special cleaning and testing procedures
Classification of contamination levels in accordance with ASTM G93-03:2004 ch. 11.4.3
As a manufacturer of high-quality measuring instruments, WIKA faces around the increased demands of the markets and develops special cleaning procedures specifically for its products. If, for instance, a CPG1500 digital pressure gauge is intended for oxygen service (option ?Oxygen, oil and grease free for oxygen applications?), before packing, the instrument will once again be cleaned additionally and taken to the business?s own laboratory for residual hydrocarbon determination. As standard, in calibration technology, a hydrocarbon limit value of max. 200 mg/m� (per ISO 15001:2012) and for particles/fibers a limit value of 1000 �m is defined.
Steps in the calibration technology laboratory
The wetted parts ? specifically the pressure connection ? are rinsed with an extractant
The extractant is collected and analysed for foreign particles, and the hydrocarbon content is determined
An assessment of the measurement is carried out with regards to the level classification relative to ASTM G93-03:2004 ch. 11.4.3
The wetted parts are rinsed again having an extractant
The extractant is collected and analysed for foreign particles, and the particle quantity is set
The evaluation of the particle quantity is carried out in accordance with ISO 15001 cat.1
Result of the procedure
Example certificate for CPG1500
The consequence of this determination, meaning the actual residual hydrocarbon content and number of particles, is documented in a 3.1 inspection certificate in accordance with DIN EN 10204 (see figure). The pressure connection of the cleaned and tested digital pressure gauge is provided with a protection cap. Subsequently, the entire instrument is sealed within foil. Furthermore, the product label shows the choice ?oxygen, oil and grease free?. The determination of the rest of the hydrocarbon content is carried out for each individual digital pressure gauge.
Note
Further information on the CPG1500 can also be on the WIKA website.

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