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In steam service above 35 bar and for media with a high pH-value. In that cases DGW transparent glasses must be protected by a mica shield on the side facing the medium chamber. Transparent glasses should always be chosen for contaminated, viscous or corrosive media. Within the given service limitations they may be used for all media except steam at pressures up to 340 bar or temperatures up to 400°C.
Types of transparent glasses:
There are four different types of transparent gauge glasses: A, B, H And TA-28.