Honeywell 51454896-001 STT700 Temperature Transmitter

HONEYWELL 51454896-001 SMARTLINE STT700 TEMPERATURE TRANSMITTER PUCK MODULE

The Honeywell 51454896-001 is the puck module designed for the Honeywell SmartLine STT700 Series smart temperature transmitters. Built to withstand high-vibration, high-EMI industrial and marine engine room environments, the 51454896-001 provides precision conversion of RTD, thermocouple, direct millivolt, and ohmic sensors into a linearized 4–20 mA analog output carrying HART 7 digital communication.

The module is housed in a compact DIN Form B hockey-puck format, fitting seamlessly into Honeywell cast aluminum or stainless-steel explosion-proof connection heads (such as the STT700 direct-mount or remote pipe/wall-mount configurations) or into standard DIN rail cradles.

Model Details

• Manufacturer: Honeywell
• Model Code Series Base: STT700 (SmartLine Temperature Transmitter Family)
• Part Number (MPN): 51454896-001
• Module Description: Hockey Puck Replacement Assembly / Field Electronics Core for STT700-1H Single-Input HART Units
• Internal Printed Board Assembly: 60133867-001
• Hardware Interfacing: 8-pin digital edge-connector for the optional field-mountable Honeywell STT700 Standard LCD Display (2-line alphanumeric PV meter)

Compatibility

• Honeywell Field Enclosures: Fits standard STT700 explosion-proof cast aluminum (painted) and 316 stainless-steel field housings (NEMA 4X / IP66 / IP67).
• Complete Transmitter Assemblies: Direct replacement module inside Honeywell transmitter models STT700-1H-… (Single-input HART versions).
• Display Compatibility: Directly couples with Honeywell STT700 Standard LCD Display Panel (part of modular clip-in visual assembly).
• System Automation Hosts: Fully integrated via DD (Device Description) / DTM with Honeywell Experion PKS, Honeywell Field Device Manager (FDM), Emerson AMS Device Manager, Yokogawa PRM, ABB Ability, and handheld calibrators (Honeywell MC Toolkit, Emerson 475, Trex)

Part Number Cross-References

• Honeywell Internal MPN: 51454896-001
• Related STT700 Puck Variants:
  • 51454896-002: STT700 Dual-Input HART replacement module
  • 51454896-003: STT700 Single-Input DE (Honeywell Digitally Enhanced) module
  • 51454896-004: STT700 Dual-Input DE module
• Associated Sub-Assembly: Board marking 60133867-001
• Drop-in Migration Replacement For Legacy Transmitters: Serves as the modern SmartLine replacement core for discontinued Honeywell STT250 series (STT25H, STT25T, STT250-00) when upgraded to STT700 architecture.

Frequently Asked Questions

What is the primary difference between Honeywell 51454896-001 and 51454896-002?

The 51454896-001 is the single-input HART protocol electronics module, while the 51454896-002 is the dual-input HART variant. Dual-input modules support redundant sensor tracking, differential temperature calculations, and automatic sensor failover, whereas the 51454896-001 is optimized for cost-effective, dedicated single-sensor measuring points.

Can the Honeywell 51454896-001 replace an older Honeywell STT250 puck?

Yes. The 51454896-001 STT700 puck has identical standard DIN Form B physical mounting dimensions and mounts inside existing STT250 field connection heads. It upgrades your measurement loop with faster digital processing, standard HART 7 support, and SIL 3 capability.

How is the fail-safe burnout current set on this transmitter?

Burnout behavior is software-configurable via any HART hand-held communicator (such as the Emerson Trex or Honeywell MC Toolkit) or an FDM workstation. You can designate the failure response to adhere to NAMUR NE43 specifications: up-scale (≥ 21.5 mA) or down-scale (≤ 3.6 mA).

What happens if I reverse the + and – loop supply wires?

The Honeywell 51454896-001 features Honeywell’s SmartLine Universal Terminal input circuitry, making loop power connection polarity-insensitive. Connecting the DC loop power in reverse will not damage the module or burn out the onboard input circuit; the transmitter will continue to power up and operate normally.

Does this puck module require a display to operate?

No. The 51454896-001 operates as a standalone blind temperature transmitter module. However, if local indication is required, Honeywell’s clip-on 2-line alphanumeric LCD display can be plugged directly into the built-in 8-pin interface at any time without recalibrating the transmitter.