- 2051CD Differential Pressure Transmitter 2 Pressure Upper Range Limit: 250 inH2O (623 mbar) A 4-20 mA with Digital Signal Based on HART 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 B2 Traditional Flange Bracket for Panel Mounting CS Bolts I1 ATEX Intrinsic Safety L4 Austenitic 316 SST Bolts M5 LCD Display