- 2051CD Differential Pressure Transmitter 2 Pressure Upper Range Limit: 250 inH2O (623 mbar) F FOUNDATION Fieldbus Protocol 22 Process Flange Type: Coplanar Flange Material: SST Drain Vent: SST Isolating Diaphragm: 316L SST A O-Ring: Glass-Filled TFE 1 Sensor Fill Fluid: Silicone J Housing Material: SST Conduit Entry Size: 1/2-14 NPT H3 Traditional Flange Cast C-276 Alloy C-276 Drain/Vent B3 Traditional Flange Flat Bracket for 2-in. Pipe Mounting CS Bolts K5 FM Explosion-Proof Dust Ignition-Proof Intrinsically Safe Division 2 L4 Austenitic 316 SST Bolts M5 LCD Display