What it sits on and what it measures
The 266DSHESKA2T1E1L1B2H1 is an ABB 266-series differential pressure transmitter coded for differential measurement at standard static pressure, with the digital LCD and integrated keypad built into the head for local span and damping adjustments without a handheld.
Loop output and hazardous area
Output code 1 layers HART on top of a 4 to 20 mA loop with the advanced functionality block (which folds in the R1 remote-seal diagnostics option), so a 4-wire DCS card or a HART handheld both read process variable and configuration over the same pair. Approval code is ATEX Intrinsic Safety Ex ia — the loop must be fed from a certified IS barrier or segment coupler, and entity parameters on the barrier match the 266DSHESKA2T1E1L1B2H1 nameplate before commissioning, especially in a hydrocarbon or solvent-vapor service where a non-IS swap is a real liability.
Build codes and what they pin down
Diaphragm/fill fluid code K and process-flange/adapter code A fix the wetted side — when a storekeeper pulls this from the shelf, K and A on the nameplate are what verify it is the same wetted build the original PO authorized, and what rules out a drop-in alternate from a different cell in the 266 family.
Lead time and shelf posture
ABB lists this build as current production with an 8 to 10 week factory lead time, so it is a quoted-to-order part rather than a shelf-sitter — the right MRO call is to keep it on the BOM reorder line and trigger a min/max release before the eight-week mark, not to wait for a line-down.