Allen-Bradley 836T-D451JX9 Pressure Difference Control

Allen-Bradley 836T-D451JX9 Pressure Difference Control is a D-style industrial differential pressure control that uses two copper alloy bellows to monitor the pressure difference between two process lines. It provides independently adjustable system difference range and differential, with a maximum line pressure rating of 175 psi, an adjustable operating range of 20 psi, and an approximate mid-range differential around 2.5 psi. The enclosure supports industrial environments (Enclosure Type 1, 4 and 13) and the unit uses a SPDT, two-circuit contact block for signaling; copper alloy bellows are suitable for many non-corrosive liquids and gases but should not be used with water or air, or fluids not compatible with copper alloys. Factory settings ship with the maximum operating range and minimum differential, and ordering options include X9 neon pilot light (120 V AC) for visual indication. Style D indicates independent adjustment for both the overall system difference and the differential, with two bellows—one connected to each monitored system—providing the differential control in demanding machine-tool and process applications.