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Positive material identification test (PMI)

The positive material identification test – PMI test – serves as a proof of the alloying constituents present in the material, confirming the melting analysis of the material contained in the 3.1 certificate.There are two different test procedures common for thermowells:PMI test: X-ray fluorescence analysis of the thermowell stem1. PMI test: X-ray fluorescence analysis (XRF)X-ray […]

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Safe filter monitoring with differential pressure gauges

Filter monitoring is a core task of differential pressure gauges ? the differential pressure increases when the filter becomes clogged. The measuring instruments thus signal when the filter must be cleaned or replaced. The efficiency of this type of solution can be illustrated by the exemplory case of WIKA pressure gauges of the DELTA-line series

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What is meant by diagnostic coverage?

ไดอะแฟรม ซีล in the use of pressure sensors in safety devices is the so-called “Diagnostic Coverage” (DC). However, since single-channel, in particular, but also two-channel safety circuits often malfunction or may be defective, a known diagnostic coverage helps interpret such structures properly.Here, a statistical significance for the diagnostic coverage can only be determined by testing

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RoHS marking and certificates

I am often asked, “How is a RoHS marking actually carried out?” The quick answer: EU RoHS will, from 22nd July 2017, be visible in the CE marking and the declaration of conformity linked to it. China RoHS conformant instruments carry a green logo. Non-conformant instruments in accordance with China RoHS carry an orange logo

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