Specifications Basic information Standard ■ EN 837-1 ■ ASME B40.100 For information on the “Selection, installation, handling and operation of pressure gauges”, see technical information IN 00.05. Further version Special design, model 213.57 Nominal size (NS) ■ Ø 50 mm [2"] ■ Ø 63 mm [2 ½"] ■ Ø 100 mm [4"] Connection location ■ Lower mount (radial) ■ Centre back mount (only for NS 50 [2"] and NS 63 [2 ½"]) ■ Lower back mount (only for NS 100 [4"]) Window ■ Plastic, crystal-clear ■ Laminated safety glass Case Design NS 50 [2"], 63 [2 ½"] Safety level “S2” per EN 837-1: With blow-out device NS 100 [4"] Safety level “S1” per EN 837-1: With blow-out device Position of blow-out device: NS 50 [2"]: Case back, at 12 o'clock NS 63 [2 ½"], 100 [4"]: Case circumference, at 12 o'clock Filling plug can be vented and resealed for internal pressure compensation Sealing towards process connection with O-ring Material Stainless steel, natural finish Ring Crimp ring, stainless steel Mounting ■ Without ■ Panel mounting flange, stainless steel 1) ■ Panel mounting flange, polished stainless steel 2) ■ Triangular profile ring with mounting bracket, polished stainless steel 3) ■ Surface mounting flange, stainless steel 4) Case filling ■ Glycerine ■ Glycerine-water mixture for scale range ≤ 0 ... 2.5 bar [≤ 0 ... 40 psi] ■ Silicone oil Movement Copper alloy