Design EN 837-3 Sizes 4” & 6” (100 & 160 mm) Accuracy class ± 2.5% of span Ranges Vacuum / Compound to 300 psi (20 bar) Pressure from 6” H₂O (16 mbar) to 100″ H₂O (250 mbar), 6″ (160 mm) flange diameter Pressure from 6 psi (400 mbar) to 360 psi (25 bar), 4” (100 mm) flange diameter or other equivalent units of pressure or vacuum Working pressure Steady: full scale value Fluctuating: 0.9 x full scale value Overpressure safety 5 x full scale value, max. 600 psi (400 bar) Operating temperature Ambient: -4°F to +140°F (-20°C to +60°C) Medium: +212°F (+100°C) maximum Storage: -40^oF+158°F (-40^cC to +70^oC) -4^oF to + 158oF (-20^oC to + 70^oC) for ranges ≤ 25″WC (60 mbar) Temperature error Additional error when temperature changes from reference temperature of 68°F (20°C) ±0.8% of span for every 18°F (10°K) rising or falling.  

  Weather protection Weather resistant (NEMA 3 / IP54)-dry case Weather tight (NEMA 4X / IP66)-liquid-filled case Pressure connection and lower diaphragm housing 1” 150# RF flange or 2” 150# RF flange Case and upper diaphragm housing Material: stainless steel Case with blowout disk and stainless steel bayonet ring Diaphragm element ≤100” H₂O (250 mbar): 316 stainless steel with PTFE lining > 100” H₂O (250 mbar): Duratherm (NiCrCo-alloy) with PTFE lining Movement Material: stainless steel Dial White aluminum with black lettering Pointer Black aluminum, adjustable-Type 452.50 Black aluminum, non-adjustable-Type 453.50 Window Laminated safety glass with Buna-N gasket Case fill Standard dry Glycerine 86.5% – Type 453.50