- 2051CD Differential Pressure Transmitter 1 Pressure Upper Range Limit: 25 inH2O (62.2 mbar) A 4-20 mA with Digital Signal Based on HART Protocol 33 Process Flange Type: Coplanar Flange Material: Cast C-276 Drain Vent: Alloy C-276 Isolating Diaphragm: Alloy C-276 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 I1 ATEX Intrinsic Safety L4 Austenitic 316 SST Bolts M5 LCD Display