A seal system, couplable to a coplanar inlet plate of a differential pressure transmitter, the coplanar inlet plate including high and low side diaphragms (116, 118) and coplanar inlet plate bolt holes (120, 122, 124, 126), the seal system comprising: a first plate assembly that includes first plate assembly bolt holes, at least some of which are alignable with the coplanar inlet plate bolt holes (120, 122, 124, 126), and first high and low side isolator fluid passages that are alignable with the high and low side diaphragms (116, 118); a second plate assembly that is stacked on the first plate assembly to form a plate stack, that includes the first and second plate assemblies (170, 172), the second plate assembly including second plate assembly bolt holes aligned with first plate assembly bolt holes; high and low side capillary connectors (160, 164) connected to the plate stack, the high and low side capillary connectors (160, 164) having second high and low side isolator fluid passages that are aligned with the first high and low side isolator fluid passages; capillaries (158, 162) connected to the high and low side capillary connectors (160, 164); seals (150, 152) that connect to the capillaries (158, 162); characterized in that the plate stack is to be bolted to the coplanar inlet plate with bolts via bolt holes such as coplanar inlet plate bolt holes (124, 126) and the plate stack includes a central split line separating high and low side components of one of the first and second plate assemblies (170, 172) such that separate replacement of a selected one of the high and low side components, while avoiding replacement of a non-selected one of the high and low side components is possible wherein high and low sides refer to nominally higher and lower pressure sides, relative to one another, of the differential pressure transmitter and the seal system. a first plate assembly that includes first plate assembly bolt holes, at least some of which are alignable with the coplanar inlet plate bolt holes (120, 122, 124, 126), and first high and low side isolator fluid passages that are alignable with the high and low side diaphragms (116, 118); a second plate assembly that is stacked on the first plate assembly to form a plate stack, that includes the first and second plate assemblies (170, 172), the second plate assembly including second plate assembly bolt holes aligned with first plate assembly bolt holes; high and low side capillary connectors (160, 164) connected to the plate stack, the high and low side capillary connectors (160, 164) having second high and low side isolator fluid passages that are aligned with the first high and low side isolator fluid passages; capillaries (158, 162) connected to the high and low side capillary connectors (160, 164); seals (150, 152) that connect to the capillaries (158, 162); characterized in that the plate stack is to be bolted to the coplanar inlet plate with bolts via bolt holes such as coplanar inlet plate bolt holes (124, 126) and the plate stack includes a central split line separating high and low side components of one of the first and second plate assemblies (170, 172) such that separate replacement of a selected one of the high and low side components, while avoiding replacement of a non-selected one of the high and low side components is possible wherein high and low sides refer to nominally higher and lower pressure sides, relative to one another, of the differential pressure transmitter and the seal system.