For its variable area flowmeters DK 32, DK 34 and DK 37, Krohne now offers the option of surface passivation for trace-level analysis.
Trace-level analysis is used to provide evidence of very small concentrations in the range of parts per million to parts per billion. Here, it is very important that none of the particles to be detected are already absorbed in the sample feed line as this could lead to a delayed, or even wrong, analysis result. Examples are the measurement of H2S content in natural gas or oil, mercury, or NOx/SOx flue gas analysis in various industries.
To avoid adsorption, sample feed lines, fittings and valves can be surface passivated. This can now also be applied to the DK 32, DK 34 and DK 37 all-metal purgemeters that are used for adjustment and monitoring of the sample flow to the analyser.
Before assembly and calibration, all metal components in contact with the medium such as cone, float, valve components, etc, receive a SilcoNert 2000 inert silicon coating, a patented surface treatment, at a temperature of 400°C. The same is possible for wetted metal components of DK 46, DK 47, DK 48 and DK 800 glass devices.
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