Sight glass reference
Short answer → diagram or table → verification algorithm → typical mistakes → limits. No filler texts.
DIN 28120 and DIN 28121: construction and connection differencesHow weld-in fittings differ from constructions with a load path bypassing the glass, and why replacing one type with the other requires verification.How to choose a sight glass for a vessel: 10 input parametersA checklist of input data: task, mounting, geometry, pressure, temperature, medium, materials, lighting, documents, maintenance.DN, PN, glass dimensions and the view diameter: what they meanFour different characteristics that are often confused: DN, PN, the free diameter and the glass outer diameter.DIN 7080 borosilicate glass: scope and limitsWhat DIN 7080 describes, why 280 °C is a characteristic of the element and not of the assembly, and what to verify at replacement.PTFE, EPDM, FKM, graphite gaskets: what must be clarifiedThe roles of medium-contact and compensating gaskets and four questions to ask about any seal material.How to replace a glass disc: what to measure and which documents are neededA step-by-step replacement procedure: measurements, material selection, documents, safety.Mounting a weld-in sight fitting: general principlesWhy the welding and tightening sequences are defined by the manufacturer instructions, and what to verify before mounting.When a sight window needs lightingSigns that natural light is not enough and what to verify when choosing a light fitting.Wipers and washing when the medium fouls the glassWhen fouling makes observation impossible and how wipers and washers are arranged.Vacuum, pressure fluctuations and thermal cycles: why they matterThree factors most often missing from inquiries that damage glass and gaskets.Vessel sight window vs flow indicator vs level gaugeWhy these are different products and why they must not be mixed in one catalog or inquiry.