What the 266HRH is, and where it earns its place
The 266HRH.S.R.R.T.8-.W8.L1.B7.....I2..C1...H3 + S26RR.H.E2.S.F.SM.3.A.L.S.N.N.N: The ABB 266HRH.S.R.R.T.8-.W8..B7.....I2..C1...H3 + S26RR.H..S.F.SM.3.A.L.S.N.N.N is a gauge pressure transmitter from the 266HRH family with a remote diaphragm seal, built on a 0.06 % base-accuracy platform. The S26RR… extension on the seal side is a flush, ring-joint-type rotating flange seal, sized for an ASME CL 300 / 2 in. flange with AISI 316 ss flange material and AISI 316 L ss armour on the capillary — the configuration a process engineer picks when the process fluid cannot be allowed into the impulse line and the transmitter body must live away from the tap. Span limits are 267 and 16000 kPa / 2.67 and 160 bar / 38.7 and 2320 psi, so the same head covers both low-pressure gauge service and the upper end of boiler-feed or hydrostatic-vessel work without a second device in the BOM. For the design engineer, that span headroom is the first thing to check — turndown and zero-suppression are decided at the bench, not in the field.
Output, safety integrity, and hazardous-area approvals
Output is HART overlaid on a 4 to 20 mA loop, certified to IEC 61508 for functional safety. IEC 61508 certification is the deciding line for safety-instrumented loops — the same transmitter can serve as a measurement element in a SIF block rather than being paralleled by a separate safety transmitter. Hazardous-area coverage is the combined Inmetro (Brazil) package: intrinsic safety Ex ia, explosion-proof, and intrinsic safety Ex ic — so the same head can be specified in Brazilian zones without re-engineering the certification envelope. Inmetro Ex ia and Ex ic cover the Zones 0/1 and Zone 2 hazardous-area placements typically called out for refinery and petrochemical gauge-pressure taps.
Diaphragm, fill fluid, and NACE wet-side stack
The wet-side stack is AISI 316 L ss diaphragms on both the transmitter and the remote seal, with silicone oil (PMX 200, 10 cSt) as the fill fluid across a -40 to 250 °C (-40 to 480 °F) window. NACE compliance is flagged on both the diaphragm material and the fill-fluid pairing — the combination matters for sour-service applications where standard austenitic stacks fail under sulfide-stress cracking rules. The high-pressure side connects to the seal, with the process-side diaphragm in the rotating-flange ring-joint geometry typical of ASME B16.5 RTJ flanges. With a flush seal and no flushing ring or gasket, the process tap is unobstructed — suited to clean service where the seal face must be wiped down during pigging or chemical-cleaning cycles without removing a ring spacer.
Calibration traceability and documentation package
Documentation is the calibrated, traceable set an inspection engineer expects on a custody-grade head: an EN 10204-3.1 inspection certificate of calibration to 9 points, and a separate EN 10204-3.1 inspection certificate for the process wetted parts, excluding gaskets. Two distinct certificates — one for the as-shipped calibration curve, one for the metallurgy of what touches the process — is what the QA file requires when the transmitter lands on a vessel or pipeline that will later be audited. Identification is carried on laser-printed stainless steel tag and certification plates, and the housing is the AISI 316 L ss barrel version with an M20 x 1.5 (CM20) electrical entry. Stainless plates paired with a stainless housing keep the nameplate legible after years of washdown or coastal exposure, where an adhesive or anodised tag would fail first.
Lifecycle stage and how it is sourced
The combination — current status, multi-month build window — is the rhythm of a configured-to-order ABB 2600T-class head: the seal, capillary length, diaphragm material, certification package, and hazardous-area approval are all chosen per device, and that selection drives a lead-time slot at the factory rather than a shelf-pull. For procurement, this is quoted against an RFQ against the BOM: confirm the configured options match the datasheet code (the string is long precisely because every letter is a chosen variant) and ask for a current price and a confirmed ship date at quote time. Independent distribution is the channel that handles configured ABB 266HRH builds; volume and pricing land at the RFQ, not on a published price sheet.