Rosemount 248 Series Modules

Technical Dossier

Product Details And Specifications

Rosemount 248 Series: Comprehensive Module Range and Technical Overview

The Rosemount 248 Series Head Mount Temperature Transmitter is a field-proven instrument deployed across the full spectrum of heavy industrial process environments, including petroleum refining, chemical processing, nuclear power generation, LNG terminals, and offshore platforms. Manufactured by Emerson (formerly Fisher-Rosemount), the 248 Series occupies a critical position in distributed control system (DCS) architectures where accurate, loop-powered temperature measurement is non-negotiable. Its compact DIN B head-mount form factor allows direct installation on thermocouple and RTD sensor heads, eliminating the need for separate field junction boxes and reducing signal degradation over long cable runs. Installed base counts for the 248 Series run into the hundreds of thousands of units globally, making it one of the most widely maintained temperature transmitter platforms in the process industries.

The Evolution of 248 Series Architecture

The Rosemount 248 platform was introduced as a successor to earlier analog-only transmitter designs, incorporating HART (Highway Addressable Remote Transducer) protocol communication from its foundational revision. Early production units (pre-2000) used a single-compartment housing with limited configuration options, requiring bench calibration via HART communicator. Subsequent hardware revisions introduced expanded input type coverage — from a limited RTD/TC selection to support for over 20 sensor types including Pt100, Pt200, Pt500, Pt1000, Cu10, Ni120, and all standard thermocouple types (B, E, J, K, N, R, S, T). The 248 Series is not a Foundation Fieldbus or PROFIBUS device; it operates exclusively on 4–20 mA HART, which defines its compatibility boundary within modern DCS environments. Plants migrating to Fieldbus or Ethernet-APL architectures must evaluate the Rosemount 644 or 848T as functional replacements. However, for legacy HART-based DCS installations — including Emerson DeltaV, Honeywell TDC 3000, ABB System 800xA, and Yokogawa CENTUM — the 248 remains a direct drop-in replacement with no loop rewiring required. The series entered its mature/end-of-active-development phase, meaning Emerson no longer introduces new hardware variants; long-term support is now the primary procurement driver for this platform.

Rosemount 248 Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified, commonly stocked configurations of the Rosemount 248 Series. Each model number encodes input type, output signal, approval class, and housing material per Rosemount's standard ordering matrix.

248HANAN0: Head mount, HART, universal input (RTD/TC/mV/Ω), no approvals, aluminum housing, standard build.
248HANAN1: Head mount, HART, universal input, no approvals, aluminum housing, enhanced EMI filter.
248HANAS0: Head mount, HART, universal input, no approvals, stainless steel housing, standard build.
248HANAS1: Head mount, HART, universal input, no approvals, stainless steel housing, enhanced EMI filter.
248HAEAN0: Head mount, HART, universal input, ATEX Ex ia IIC T6 approval, aluminum housing.
248HAEAN1: Head mount, HART, universal input, ATEX Ex ia IIC T6, aluminum housing, enhanced EMI filter.
248HAEAS0: Head mount, HART, universal input, ATEX Ex ia IIC T6, stainless steel housing.
248HAFAN0: Head mount, HART, universal input, FM/CSA intrinsically safe approval, aluminum housing.
248HAFAS0: Head mount, HART, universal input, FM/CSA intrinsically safe, stainless steel housing.
248HANAN0-A: Standard build with extended temperature range option (-50°C to +85°C ambient).
248HANAN0-B: Standard build with conformal coating for high-humidity environments.
248HAEAN0-A: ATEX-approved, extended ambient temperature range variant.
248HAFAN0-A: FM/CSA-approved, extended ambient temperature range variant.
248HANAS0-B: Stainless steel housing, no approvals, conformal coating option.
248HAEAS0-A: ATEX-approved, stainless steel, extended temperature range.
248HAFAS0-B: FM/CSA-approved, stainless steel, conformal coating for offshore/marine service.

Sourcing Hard-to-Find & Obsolete 248 Series Parts

Quality Control for the 248 Series Range

Each Rosemount 248 unit processed through DriveKNMS undergoes a structured verification protocol before dispatch. Input accuracy is verified across the full sensor input range using a Fluke 725 multifunction process calibrator, confirming 4–20 mA output linearity against reference RTD and thermocouple inputs. HART communication integrity is tested using a Emerson 475 Field Communicator to confirm device descriptor, tag, and configuration register accessibility. Housing seal integrity is inspected per IP66/IP67 ingress protection requirements, with particular attention to conduit entry threads and cover O-ring condition on aluminum housings. For ATEX and FM/CSA-certified units, certification label legibility and housing integrity are documented photographically prior to shipment. Units that fail any test parameter are quarantined and not offered for sale. Calibration certificates are available upon request for units requiring documented traceability.