Rosemount 248HANAN0 Replacement/Upgrade for 248 Series

Product Overview

Rosemount 248HANAN0 Replacement/Upgrade for 248 Series: Seamless Transition to Modern Temperature Measurement

The Rosemount 248HANAN0 is a compact, head-mount temperature transmitter from Emerson’s 248 Series, designed for direct installation inside standard connection heads (Form B / DIN 43729). It accepts RTD (Pt100, Pt1000) and thermocouple (TC) inputs and delivers a universal 4–20 mA HART output, making it one of the most widely deployed field instruments in process industries worldwide. When your existing 248 Series unit reaches end-of-life, becomes obsolete, or fails in service, the 248HANAN0 provides a verified drop-in replacement that preserves your existing wiring, connection head, and DCS/PLC configuration with minimal engineering effort.

Many facilities running legacy Emerson DeltaV DCS or Rosemount 3051 pressure transmitter networks have standardized on the 248 Series for temperature loops. Replacing a failed transmitter with the 248HANAN0 means your existing 4–20 mA wiring, terminal block assignments, and HART device descriptors remain unchanged. Engineers familiar with AMS Device Manager or FieldCommunicator 375/475 can commission the 248HANAN0 in minutes using the same DD files already loaded on their handheld or workstation.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful temperature transmitter replacement rarely involves a single component in isolation. In most retrofit projects, the 248HANAN0 is installed as part of a broader loop modernization effort. During the upgrade, engineers typically inspect and replace the thermowell and thermocouple sensor assembly — such as a Rosemount 0065 or 0085 Series thermowell — to ensure the mechanical interface and immersion length remain correct for the process pipe or vessel.

On the control system side, the 248HANAN0’s HART 7 output integrates directly with Emerson DeltaV I/O cards, including the MD Plus controller and its associated AI (Analog Input) HART-enabled I/O modules. For facilities using a Rockwell Automation ControlLogix or CompactLogix PLC as the primary controller, the 4–20 mA signal feeds into standard 1756-IF16 or 1769-IF4 analog input modules without any hardware modification. The existing channel scaling (4 mA = low range, 20 mA = high range) and engineering unit conversion in the PLC program remain valid.

Where HART multiplexers are deployed — for example, a Pepperl+Fuchs or Emerson Smart Wireless THUM adapter — the 248HANAN0 is recognized automatically once the device descriptor is updated in the asset management software. Facilities using a Yokogawa CENTUM VP DCS with BRAIN or HART-compatible field bus cards will find the same plug-and-play behavior, as the transmitter’s HART implementation follows the universal command set.

For installations in hazardous areas (Zone 1 / Zone 2 or Class I Division 1), the 248HANAN0 is available with ATEX and IECEx certifications. In these environments, the associated Rosemount 248 Series Zener barrier or galvanic isolator — such as a MTL 787S+ or P+F KFD2-STC4-Ex1 — remains compatible with the transmitter’s input impedance and loop current characteristics, so the safety barrier does not need to be replaced.

During commissioning, a FieldCommunicator 475 or Emerson AMS Trex device communicator is used to configure the transmitter’s sensor type, range, damping, and HART tag. The configuration procedure is identical to previous 248 Series variants, so technicians already trained on the platform require no additional instruction. Once configured, the transmitter’s output can be verified against a Fluke 725 multifunction process calibrator or equivalent reference standard before the loop is returned to service.

In multi-loop control cabinets where space is at a premium, the 248HANAN0’s compact PCB design fits within the same Form B connection head used by the outgoing transmitter, eliminating any need to modify the thermowell neck tube, conduit entry, or cable gland. This is particularly valuable in skid-mounted systems or offshore platforms where physical access is restricted and downtime costs are high.

Retrofit Guidance FAQ

Q: Do I need to rewire the loop when replacing my existing 248 Series transmitter with the 248HANAN0?
No. The 248HANAN0 uses the same 2-wire 4–20 mA loop connection and identical screw terminal layout as previous 248 Series variants. Your existing field cable, terminal block, and marshalling panel wiring remain unchanged.

Q: Is the 248HANAN0 compatible with my existing HART master (DCS, PLC, or handheld communicator)?
Yes. The 248HANAN0 supports HART 7, which is backward compatible with HART 5 and HART 6 masters. Any HART-capable DCS I/O card, HART multiplexer, or handheld communicator (FieldCommunicator 375/475, AMS Trex) will communicate with the device using standard universal and common practice commands.

Q: Will my existing PLC or DCS program need to be modified?
In most cases, no. The 4–20 mA output range and engineering unit scaling are preserved. If your program uses HART pass-through to read device variables (PV, SV, TV, QV), you may need to update the device descriptor (DD) file in your asset management software, but no ladder logic or function block changes are required.

Q: Does the 248HANAN0 fit in the same connection head as my old transmitter?
Yes. The 248HANAN0 is designed for standard Form B (DIN 43729) connection heads. The PCB dimensions and mounting hole pattern are compatible with the existing head, so no mechanical modifications are needed.

Q: What sensor types does the 248HANAN0 support?
The 248HANAN0 supports a wide range of RTD inputs (Pt100, Pt500, Pt1000, Ni100, Ni120) and thermocouple types (J, K, T, E, R, S, B, N, C). The sensor type is configured via HART communicator during commissioning. If your existing sensor type is supported (which covers the vast majority of industrial applications), no sensor replacement is required.

Q: Can the 248HANAN0 be used in hazardous area installations?
Yes, subject to the specific approval suffix on the model code. The 248HANAN0 is available with ATEX, IECEx, and FM/CSA certifications for use in Zone 1/2 and Class I Division 1/2 hazardous locations. Verify the approval code matches your area classification before installation.

Q: What is the lead time and shipping arrangement?
In-stock units ship within 1–3 business days from our Xiamen warehouse. International orders are shipped via DHL Express, FedEx International Priority, or UPS Worldwide Expedited, with full tracking provided. Customs documentation (commercial invoice, packing list, HS code declaration) is prepared for each shipment to minimize clearance delays.

Warranty Assurance

Every Rosemount 248HANAN0 unit supplied by TOPNLMS is covered by a 12-Month Warranty from the date of shipment. Prior to dispatch, each unit undergoes a pre-shipment functional test that verifies loop current output across the 4–20 mA range, HART communication integrity, and sensor input response. Units that do not pass the test are quarantined and not shipped.

In the event of a warranty claim, TOPNLMS provides a replacement unit or full refund within the warranty period. Our after-sales response time is within 24 hours on business days. Warranty claims are processed with a minimum of documentation — a description of the fault and the original order number are sufficient to initiate the process.

For procurement teams, we can provide a Certificate of Conformance (CoC), material test reports, and country-of-origin documentation upon request. Bulk orders (5 units or more) are eligible for additional inspection and testing services, including third-party calibration certificates traceable to national standards.

TOPNLMS maintains stock of the 248HANAN0 and related 248 Series components to support emergency replacement requirements. If your facility operates a critical process loop and requires guaranteed next-day availability, contact our sales team to discuss a consignment stock or blanket order arrangement.