Honeywell 51204162-175 DIN-Rail/Mountable Temperature Transmitter Module

Description

Honeywell 51204162-175 DIN-Rail/Mountable Temperature Transmitter Module

Product Dimensions：

Honeywell offers highly reliable DIN-Rail Mountable Temperature Transmitters designed for high-density installation within control cabinets. The most prominent modern series for this application is the SmartLine STT850 and STT750 DIN-rail variants, as well as the classic STT350 and STT250 modules adapted with DIN-rail clips.

Product Detailed Description

These modules are designed to convert low-level signals from temperature sensors—specifically RTDs (Resistance Temperature Detectors) and Thermocouples—into a highly stable, noise-immune 4–20 mA analog output (often superimposed with digital HART, DE, or Foundation Fieldbus protocol). By mounting these transmitters on a standard 35mm DIN rail inside a marshaling cabinet, industrial plants can centralize their temperature loops, simplify field wiring, and protect sensitive electronics from harsh process environments.

Typical Technical Parameters

The following parameters reflect the high-performance STT850 / STT750 DIN-rail specification standard.

Product Advantages

• Space-Saving Design: The slim DIN-rail form factor allows dozens of transmitters to be packed into a single control cabinet, significantly reducing floor space requirements.
• Dual-Input Capabilities: Advanced models support two independent temperature sensors. This enables sensor backup (automatic failover if one sensor breaks) or drift detection to warn operators if calibration is slipping.
• Universal Input Configuration: A single module can be programmed via HART or PC software to accept almost any sensor type, drastically reducing spare parts inventory.
• Galvanic Isolation: High input-to-output isolation protects upstream PLC/DCS analog cards from localized ground loops and electrical noise generated in the field.

Important Considerations & Precautions

• Cold Junction Compensation (CJC): When using thermocouples, ensure the module’s internal CJC sensor is stable. Avoid mounting the transmitter near heat-generating components (like power supplies or VFDs) inside the cabinet, as rapid ambient temperature fluctuations can cause measurement errors.
• Lead Wire Resistance: For RTD measurements, use 3-wire or 4-wire configurations over long distances to automatically compensate for the resistance of the copper lead wires.
• Power Supply Ripple: Ensure the 24V DC loop power is clean. Excessive AC ripple on the DC line can disrupt the digital HART communication overlay.
• Sensor Burnout Action: Configure the fail-safe mode (Upscale or Downscale) during commissioning so that the DCS knows exactly how to handle a broken sensor wire safely.

Product Applications

• Refining & Chemical Cabinets: Centralizing temperature data from distillation columns, reactors, and storage tanks into remote instrument enclosures.
• Power Plant Monitoring: Tracking steam, bearing, and exhaust temperatures where high-density channel counts are required near the turbine control systems.
• HVAC & Cleanrooms: Used in environmental monitoring systems for pharmaceutical facilities where strict temperature tracking is mandatory for compliance.
• Factory Automation / OEMs: Integration into standardized machinery control panels requiring precise thermal management.

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