What sits on the line: form factor and seal stack
The ABB 266DRHHSSA1T7E1LSI2+S26RAHE2SFSM2N1SNNN ships as a differential pressure transmitter paired with a remote seal — the S 2 6 R A rotating flange diaphragm seal, flush and extended to ASME B16.5, mounted on an ASME CL 300 / 2 in. flange on the high-pressure side and connected by direct-mount construction, so no capillary tube is in the run.
Sensor envelope: 2.67 to 160 kPa differential
Span limits sit between 2.67 and 160 kPa, expressed equivalently as 26.7 to 1600 mbar and 10.7 to 642 inH2O — the 60:1 turndown gives the loop enough headroom to cover low dp filter and orifice service without re-ranging to a different body. The body is configured for differential measurement at standard static pressure, so it tracks dp across a single tap pair rather than absolute line pressure — the typical fit for level across a vessel, flow across an orifice, or filter dp on a gas train.
Wetted side: 316 L, silicone fill, NACE where it counts
Diaphragm material is AISI 316 L ss and the process flanges/adapters are AISI 316 L ss on a horizontal connection with 1/4 in. – 18 NPT-f direct process entry; bolts and gaskets on the wetted side are AISI 316 ss with Viton®, NACE per the quoted notes on non-exposed bolting. Fill fluid is silicone oil DC200 at 10 cSt, the standard fill for the differential measurement duty and the only fill quoted under this configuration.
Loop output and hazardous area rating
Output is HART and 4 to 20 mA — standard functionality on code 7 — which is the configuration the integrated digital LCD display option is tied to; the LCD fits on the barrel-housing head in AISI 316 L ss with an M20 x 1.5 (CM20) electrical entry, the same wiring path reserved for WirelessHART retrofits. Hazardous area certification is ATEX Intrinsic Safety Ex ia, so the loop can be wired into Zone 0/1 sensing lines with a suitable barrier, provided the barrier entity parameters match the Ex ia ratings on the nameplate.
Tagging, sealing, and the line back to procurement
Each unit ships with a stainless steel tag plate and certification plate, both laser-printed, so the order code and the serial stay readable in washdown and outdoor service; the seal surface is rated smooth, with no flushing ring plug or gasket ordered.